- County
- SCOTT
- Bid Order
- 013
- Enriched
- Yes
- Projects
- BRM-1827(698)--8N-82
- Proposal Id
- 82-1827-698
- Letting Date
- Oct 20, 2026
- List Url Hint
- ia.iowadot.gov/contracts/biddocuments
- Package Text
- 9/8/2026 1:05 PM
CONTRACTS AND SPECIFICATIONS BUREAU
Proposal
Proposal ID: 82-1827-698 Letting Date: October 20, 2026
Call Order: 013
Proposal Work Type: BRIDGE REPLACEMENT - CCS
DBE Goal: 0.0%
Contracting Authority: CITY OF DAVENPORT
Proposal Guaranty: $125,000.00
This proposal includes the following project(s):
Project Number: BRM-1827(698)--8N-82 County: SCOTT
Project Work Type: BRIDGE REPLACEMENT - CCS Route: EASTERN AVE.
Location: In the city of Davenport, On EASTERN AVE, Over GOOSE CREEK, S18 T78 R04E
Road System: URBAN
Federal Aid - Wages: Federal Aid - Predetermined Wages are in Effect
Contracts and Specifications Bureau
9/8/2026 1:05 PM
Contract Time
Proposal ID: 82-1827-698 Call Order: 013 Letting Date: October 20, 2026
Site ID Site Details Liquidated
Damages
00 Late Start Date 04/05/2027 105 WORK DAYS $1,000.00
.
(*) - Indicates Cost Plus Time Site. See Schedule of Items for Cost Per Unit
Contracts and Specifications Bureau
9/8/2026 1:05 PM
Proposal ID: 82-1827-698 Call Order: 013 Letting Date: October 20, 2026
Notes
Notes :
*** WINTER WORK ***
The free time allowed between November 15, 2026 and February 14, 2027 will not be permitted on this
project during this time. The Contractor shall work during this time on all working days as defined in
Article 1101.03 'Working Day'.
Winter Work will be allowed during the winter from February 15, 2027 and April 1, 2027. No working days
will be charged between February 15, 2027 and April 1, 2027.
Contracts and Specifications Bureau
9/8/2026 1:05 PM
Proposal Specifications List
Proposal ID: 82-1827-698 Call Order: 013 Letting Date: October 20, 2026
Note Description
001.2023 *** STANDARD SPECIFICATIONS -- SERIES 2023 ***
The Iowa Department of Transportation STANDARD SPECIFICATIONS FOR
HIGHWAY AND BRIDGE CONSTRUCTION, SERIES 2023, plus applicable General
Supplemental Specifications, Developmental Specifications, Supplemental
Specifications AND Special Provisions shall apply to construction work on this contract.
Contracts and Specifications Bureau
9/8/2026 1:05 PM
Proposal Specifications List
Proposal ID: 82-1827-698 Call Order: 013 Letting Date: October 20, 2026
Note Description
005.1107.02 *** Revisions to Article 1107.02 ***
Article 1107.02, Insurance, is amended by the following modifications and additions.
This proposal note becomes null and void January 1, 2027.
A. It shall be the Contractor's responsibility to have liability insurance covering all
of the construction operations incident to contract completion and the Contractor must
have on file with the Contracting Authority a current "Certificate of Insurance" prior to
award of contract. The certificate shall identify the insurance company firm name and
address, Contractor firm name, policy period, type of policy, limits of coverage, and
scope of work covered (single contract or statewide). This requirement shall apply with
equal force, whether the work is performed by persons employed directly by the
Contractor including a subcontractor, persons employed by a subcontractor, or by an
independent contractor.
B. In addition to the above, the Contracting Authority shall be included as an
insured party, or a separate owner's protective policy shall be filed showing the
Contracting Authority as an insured party.
C. The liability insurance shall be written by an insurance company (or
companies) qualified to do business in Iowa. For independent contractors engaged
solely in the transportation of materials, the minimum coverage provided by such
insurance shall be not less than that required by Chapter 325A, Code of Iowa, for such
truck operators or contract carriers as defined therein. For all other contractors,
subcontractors, independent contractors, and the Contracting Authority, the minimum
coverage by such insurance shall be as follows:
General Liability, Including: BODILY INJURY
Independent Contractors $500,000 Each Occurrence
Contractual Liability, $500,000 Aggregate
Products and Completed PROPERTY DAMAGE
Operations $250,000 Each Occurrence
$250,000 Aggregate
or
BODILY INJURY AND PROPERTY DAMAGE
- COMBINED SINGLE LIMIT*
$750,000 Each Occurrence
$750,000 Aggregate
*A comprehensive Catastrophe Liability Policy (Umbrella) can be used to aid in
achieving the minimum required limits.
Contracts and Specifications Bureau
9/8/2026 1:05 PM
Proposal Specifications List
Proposal ID: 82-1827-698 Call Order: 013 Letting Date: October 20, 2026
Note Description
*A comprehensive Catastrophe Liability Policy (Umbrella) can be used to aid in
achieving the minimum required limits.
D. Failure on the part of the Contractor to comply with the requirements of this
article will be considered sufficient cause to suspend the work, withhold estimates, and
to deny the Contractor from receiving further contract awards, as provided in Article
1103.01.
410.11 *** STORM WATER POLLUTION PREVENTION PLAN ***
A Storm Water Pollution Prevention Plan has been developed by the Contracting
Authority for one or more projects on this contract. See the project plans (or other
contract document) for specific Storm Water Pollution Prevention Plan details.
500.2027 *** NO WINTER FREE TIME ***
The free time allowed between November 15 and April 1 will not be permitted on this
project during the winter of 2027-2028. The Contractor shall work during the winter on
all working days as defined in article 1101.03 'working day'.
DS-23006 DEVELOPMENTAL SPECIFICATIONS FOR FABRIC FORMED CONCRETE
STRUCTURE REVETMENT
FHWA-1273.09 FHWA-1273: REQUIRED CONTRACT PROVISIONS FEDERAL-AID
CONSTRUCTION CONTRACTS -- REVISED OCTOBER 23, 2023
23 U.S.C. 133(i) requires application of Davis Bacon predetermined wages on certain
projects on roads functionally classified as a local road or a rural minor collector. This
supersedes the applicability described in FHWA-1273 Section IV.
GS-23007 GENERAL SUPPLEMENTAL SPECIFICATIONS FOR HIGHWAY AND BRIDGE
CONSTRUCTION, OCTOBER 20, 2026 RELEASE
Contracts and Specifications Bureau
9/8/2026 1:05 PM
Proposal Specifications List
Proposal ID: 82-1827-698 Call Order: 013 Letting Date: October 20, 2026
Note Description
IA26-1.2A PREDETERMINED WAGE RATES - GENERAL DECISION NUMBER IA20260001
FOR HEAVY AND HIGHWAY CONSTRUCTION -- SCOTT COUNTY IN IOWA
*** Additional Requirement ***
Contracts where the Department is the Contracting Authority:
The Prime Contractor and each approved Subcontractor shall submit certified payrolls
weekly to the Project Engineer. Each Contractor shall use the AASHTOWare Project
Civil Rights and Labor (AWP CRL) software to electronically submit Certified Payroll
Reports. The Contractor shall list the craft for each employee covered by the
Predetermined Wage Rates. The Prime Contractor shall review and approve each
Subcontractor’s payroll within AWP CRL.
Contracts where the Department is not the Contracting Authority:
The Prime Contractor shall submit certified payrolls for itself and each approved
Subcontractor weekly to the Project Engineer. The Contractor may use the Iowa D.O.T.
Certified Payroll form or other approved form. The Contractor shall list the craft for
each employee covered by the Predetermined Wage Rates. The Prime Contractor
shall sign each of the Subcontractor's payrolls to acknowledge the submittal of the
Certified Payroll.
SP-236073 SPECIAL PROVISIONS FOR STAINLESS STEEL GATES FOR SANITARY SEWER
MANHOLES
Scott County BRM-1827(689)--8N-82
SP-236074 SPECIAL PROVISIONS FOR SANITARY SEWER MANHOLE LINER
Scott County BRM-1827(689)--8N-82
Contracts and Specifications Bureau
9/8/2026 1:05 PM
Proposal Schedule of Items
Proposal ID: 82-1827-698 Call Order: 013 Letting Date: October 20, 2026
SECTION: 0001
ITEMS FOR A 90'-0 X 50'-0 CONTINUOUS CONCRETE SLAB BRIDGE W/5'-4 SIDEWALK
Proposal
Line
Number
Item Number
Item Description
Item Quantity
and Units
Unit Price Bid Amount
Dollars Cents Dollars Cents
0010 2101-0850001 0.100
CLEARING AND GRUBBING ACRE _________._____ _________._____
0020 2104-2710020 781.400
EXCAVATION, CLASS 10, CHANNEL CY _________._____ _________._____
0030 2105-8425005 124.000
TOPSOIL, FURNISH AND SPREAD CY _________._____ _________._____
0040 2125-2225050 1.100
RESHAPING DITCHES STA _________._____ _________._____
0050 2301-0690205 779.700
BRIDGE APPROACH, BR-205 SY _________._____ _________._____
0060 2401-6745625
REMOVAL OF EXISTING BRIDGE LUMP SUM LUMP SUM _________._____
0070 2401-6745650
REMOVAL OF EXISTING
STRUCTURES
LUMP SUM LUMP SUM _________._____
0080 2402-2720000 175.000
EXCAVATION, CLASS 20 CY _________._____ _________._____
0090 2403-0100010 351.500
STRUCTURAL CONCRETE (BRIDGE) CY _________._____ _________._____
0100 2404-7775005 83,415.000
REINFORCING STEEL, EPOXY
COATED
LB _________._____ _________._____
0110 2404-7775009 310.000
REINFORCING STEEL, STAINLESS
STEEL
LB _________._____ _________._____
0120 2412-0000100 1,232.900
LONGITUDINAL GROOVING IN
CONCRETE, BRIDGE DECK AND/OR
APPROACHES
SY _________._____ _________._____
Contracts and Specifications Bureau
9/8/2026 1:05 PM
Proposal Schedule of Items
Proposal ID: 82-1827-698 Call Order: 013 Letting Date: October 20, 2026
SECTION: 0001
ITEMS FOR A 90'-0 X 50'-0 CONTINUOUS CONCRETE SLAB BRIDGE W/5'-4 SIDEWALK
Proposal
Line
Number
Item Number
Item Description
Item Quantity
and Units
Unit Price Bid Amount
Dollars Cents Dollars Cents
0130 2414-6425410 198.000
CONCRETE BARRIER, REINFORCED,
SEPARATION
LF _________._____ _________._____
0140 2414-6444100 97.000
STEEL PIPE PEDESTRIAN HAND
RAILING
LF _________._____ _________._____
0150 2416-0100018 1.000
APRONS, CONCRETE, 18 IN. DIA. EACH _________._____ _________._____
0160 2416-0100024 1.000
APRONS, CONCRETE, 24 IN. DIA. EACH _________._____ _________._____
0170 2435-0130172 2.000
MANHOLE, SANITARY SEWER, SW-
301, 72 IN.
EACH _________._____ _________._____
0180 2435-0130410 2.000
MANHOLE, SANITARY SEWER, SW-
304 MODIFIED
EACH _________._____ _________._____
0190 2435-0140160 2.000
MANHOLE, STORM SEWER, SW-401,
60 IN.
EACH _________._____ _________._____
0200 2435-0251218 1.000
INTAKE, SW-512, 18 IN. EACH _________._____ _________._____
0210 2435-0251224 1.000
INTAKE, SW-512, 24 IN. EACH _________._____ _________._____
0220 2435-0700020 1.000
CONNECTION TO EXISTING INTAKE EACH _________._____ _________._____
0230 2501-0201042 720.000
PILES, STEEL, HP 10 X 42 LF _________._____ _________._____
0240 2501-0201253 880.000
PILES, STEEL, HP 12 X 53 LF _________._____ _________._____
Contracts and Specifications Bureau
9/8/2026 1:05 PM
Proposal Schedule of Items
Proposal ID: 82-1827-698 Call Order: 013 Letting Date: October 20, 2026
SECTION: 0001
ITEMS FOR A 90'-0 X 50'-0 CONTINUOUS CONCRETE SLAB BRIDGE W/5'-4 SIDEWALK
Proposal
Line
Number
Item Number
Item Description
Item Quantity
and Units
Unit Price Bid Amount
Dollars Cents Dollars Cents
0250 2501-5478053 264.000
CONCRETE ENCASEMENT OF STEEL
H PILES, HP 12 X 53 (P10L TYPE 3)
LF _________._____ _________._____
0260 2503-0110018 142.000
STORM SEWER GRAVITY MAIN,
TRENCHED, 18 IN.
LF _________._____ _________._____
0270 2503-0110024 172.000
STORM SEWER GRAVITY MAIN,
TRENCHED, 24 IN.
LF _________._____ _________._____
0280 2503-0200036 76.000
REMOVE STORM SEWER PIPE LESS
THAN OR EQUAL TO 36 IN.
LF _________._____ _________._____
0290 2503-0200341 239.000
STORM SEWER ABANDONMENT, FILL
AND PLUG, LESS THAN OR EQUAL TO
36 IN. DIA.
LF _________._____ _________._____
0300 2504-0110042 22.000
SANITARY SEWER GRAVITY MAIN,
TRENCHED, 42 IN.
LF _________._____ _________._____
0310 2504-0114024 243.000
SANITARY SEWER GRAVITY MAIN,
TRENCHED, POLYVINYL CHLORIDE
PIPE (PVC), 24 IN.
LF _________._____ _________._____
0320 2504-0240237 47.000
SANITARY SEWER ABANDONMENT,
FILL AND PLUG, GREATER THAN 36
IN. DIA.
LF _________._____ _________._____
0330 2507-2638660 10.100
BRIDGE WING ARMORING -
MACADAM STONE
SY _________._____ _________._____
0340 2507-3250005 616.500
ENGINEERING FABRIC SY _________._____ _________._____
Contracts and Specifications Bureau
9/8/2026 1:05 PM
Proposal Schedule of Items
Proposal ID: 82-1827-698 Call Order: 013 Letting Date: October 20, 2026
SECTION: 0001
ITEMS FOR A 90'-0 X 50'-0 CONTINUOUS CONCRETE SLAB BRIDGE W/5'-4 SIDEWALK
Proposal
Line
Number
Item Number
Item Description
Item Quantity
and Units
Unit Price Bid Amount
Dollars Cents Dollars Cents
0350 2507-6800061 509.100
REVETMENT, CLASS E TON _________._____ _________._____
0360 2507-8029000 11.500
EROSION STONE TON _________._____ _________._____
0370 2507-8500080 104.900
FABRIC FORMED CONCRETE
REVETMENT, ARTICULATING BLOCK
MAT, 8 INCH
SY _________._____ _________._____
0380 2510-6745850 794.100
REMOVAL OF PAVEMENT SY _________._____ _________._____
0390 2511-6745900 94.100
REMOVAL OF SIDEWALK SY _________._____ _________._____
0400 2511-7526004 106.400
SIDEWALK, P.C. CONCRETE, 4 IN. SY _________._____ _________._____
0410 2515-2475007 289.600
DRIVEWAY, P.C. CONCRETE, 7 IN. SY _________._____ _________._____
0420 2515-6745600 326.700
REMOVAL OF PAVED DRIVEWAY SY _________._____ _________._____
0430 2516-8625000 63.400
COMBINED CONCRETE SIDEWALK
AND RETAINING WALL
CY _________._____ _________._____
0440 2519-1002042 100.000
FENCE, CHAIN LINK, 42 IN. HEIGHT LF _________._____ _________._____
0450 2519-1002048 99.000
FENCE, CHAIN LINK, 48 IN. HEIGHT LF _________._____ _________._____
0460 2524-9100030 2.000
OBJECT MARKER, TYPE 3 EACH _________._____ _________._____
Contracts and Specifications Bureau
9/8/2026 1:05 PM
Proposal Schedule of Items
Proposal ID: 82-1827-698 Call Order: 013 Letting Date: October 20, 2026
SECTION: 0001
ITEMS FOR A 90'-0 X 50'-0 CONTINUOUS CONCRETE SLAB BRIDGE W/5'-4 SIDEWALK
Proposal
Line
Number
Item Number
Item Description
Item Quantity
and Units
Unit Price Bid Amount
Dollars Cents Dollars Cents
0470 2524-9276010 14.000
PERFORATED SQUARE STEEL TUBE
POSTS
LF _________._____ _________._____
0480 2524-9276021 2.000
PERFORATED SQUARE STEEL TUBE
POST ANCHOR, BREAK-AWAY SOIL
INSTALLATION
EACH _________._____ _________._____
0490 2524-9325001 13.000
TYPE A SIGNS, SHEET ALUMINUM SF _________._____ _________._____
0500 2524-9325150 4.000
INSTALL TYPE A SIGN EACH _________._____ _________._____
0510 2526-8285010
CONSTRUCTION SURVEY,
MONUMENT PRESERVATION
LUMP SUM LUMP SUM _________._____
0520 2526-8285020
CONSTRUCTION SURVEY, CONTROL
POINT SURVEY
LUMP SUM LUMP SUM _________._____
0530 2526-8285030
CONSTRUCTION SURVEY, RIGHT OF
WAY
LUMP SUM LUMP SUM _________._____
0540 2526-8285040
CONSTRUCTION SURVEY, LOCATION
SURVEY
LUMP SUM LUMP SUM _________._____
0550 2527-9263209 3.960
PAINTED PAVEMENT MARKINGS,
WATERBORNE OR SOLVENT-BASED
STA _________._____ _________._____
0560 2528-2518000 3.000
SAFETY CLOSURE EACH _________._____ _________._____
0570 2528-8445110
TRAFFIC CONTROL LUMP SUM LUMP SUM _________._____
Contracts and Specifications Bureau
9/8/2026 1:05 PM
Proposal Schedule of Items
Proposal ID: 82-1827-698 Call Order: 013 Letting Date: October 20, 2026
SECTION: 0001
ITEMS FOR A 90'-0 X 50'-0 CONTINUOUS CONCRETE SLAB BRIDGE W/5'-4 SIDEWALK
Proposal
Line
Number
Item Number
Item Description
Item Quantity
and Units
Unit Price Bid Amount
Dollars Cents Dollars Cents
0580 2528-9290050 14.000
PORTABLE DYNAMIC MESSAGE SIGN
(PDMS)
CDAY _________._____ _________._____
0590 2533-4980005
MOBILIZATION LUMP SUM LUMP SUM _________._____
0600 2549-0041060
BYPASS PUMPING Bypass Pumping LUMP SUM LUMP SUM _________._____
0610 2551-0000210 2.000
PERMANENT CRASH CUSHION EACH _________._____ _________._____
0620 2552-0000230 77.000
SPECIAL PIPE EMBEDMENT OR
ENCASEMENT
LF _________._____ _________._____
0630 2599-9999005 3.000
('EACH' ITEM) STAINLESS STEEL
FLAP GATE
EACH _________._____ _________._____
0640 2599-9999005 3.000
('EACH' ITEM) STAINLESS STEEL
SLUICE GATE
EACH _________._____ _________._____
0650 2601-2634100 0.300
MULCHING ACRE _________._____ _________._____
0660 2601-2639010 110.000
SODDING SQ _________._____ _________._____
0670 2601-2642100 0.300
STABILIZING CROP - SEEDING AND
FERTILIZING
ACRE _________._____ _________._____
0680 2601-2643110 0.100
WATERING FOR SOD, SPECIAL DITCH
CONTROL, OR SLOPE PROTECTION
MGAL 75.00000 7.50
Contracts and Specifications Bureau
9/8/2026 1:05 PM
Proposal Schedule of Items
Proposal ID: 82-1827-698 Call Order: 013 Letting Date: October 20, 2026
SECTION: 0001
ITEMS FOR A 90'-0 X 50'-0 CONTINUOUS CONCRETE SLAB BRIDGE W/5'-4 SIDEWALK
Proposal
Line
Number
Item Number
Item Description
Item Quantity
and Units
Unit Price Bid Amount
Dollars Cents Dollars Cents
0690 2602-0000312 900.000
PERIMETER AND SLOPE SEDIMENT
CONTROL DEVICE, 12 IN. DIA.
LF _________._____ _________._____
0700 2602-0000351 900.000
REMOVAL OF PERIMETER AND
SLOPE OR DITCH CHECK SEDIMENT
CONTROL DEVICE
LF _________._____ _________._____
0710 2602-0000530 2.000
GRATE INTAKE SEDIMENT FILTER
BAG, EC-604
EACH _________._____ _________._____
0720 2602-0000540 2.000
MAINTENANCE OF GRATE INTAKE
SEDIMENT FILTER BAG
EACH _________._____ _________._____
0730 2602-0000550 2.000
REMOVAL OF GRATE INTAKE
SEDIMENT FILTER BAG
EACH _________._____ _________._____
0740 2602-0010010 1.000
MOBILIZATIONS, EROSION CONTROL EACH 600.00000 600.00
0750 2602-0010020 1.000
MOBILIZATIONS, EMERGENCY
EROSION CONTROL
EACH 1,200.00000 1,200.00
Section: 0001 Total: _________._____
Total Bid: _________._____
DS-23006
(New)
DEVELOPMENTAL SPECIFICATIONS
FOR
FABRIC FORMED CONCRETE STRUCTURE REVETMENT
Effective Date
October 17, 2023
THE STANDARD SPECIFICATIONS, SERIES 2023, ARE AMENDED BY THE FOLLOWING
MODIFICATIONS AND ADDITIONS. THESE ARE DEVELOPMENTAL SPECIFICATIONS AND THEY
SHALL PREVAIL OVER THOSE PUBLISHED IN THE STANDARD SPECIFICATIONS.
23006.01 DESCRIPTION.
A. Construct fabric formed concrete revetment as shown on the plans. The revetment is normally
used adjacent to bridge substructure units to protect the substructure from excessive scour.
B. Use fabric formed revetment consisting of specially woven, double-layer synthetic forms filled with
a pumpable, fine aggregate concrete grout in such a way as to form a stable revetment of
required thickness, weight, and configuration.
C. Ensure the fabric formed revetment configuration is ‘Articulating Block Mat’ with reinforced
polyester cable, and/or ‘Armor Units’ with or without reinforced polyester cable according to the
contract documents.
23006.02 MATERIALS.
A. Fabric Forms.
1. Manufacturers and Products.
a. Acceptable manufacturers and products are shown in Materials I.M. 496.01, Appendix F.
b. Ensure the fabric forms supplied meet the details and specifications of the approved
products as modified by this specification.
2. Fabric and Cables.
a. General.
1) Fabricate fabric forms to conform to the dimensions shown in the contract
documents. Adjust the fabric form dimension to provide the finished dimension shown
(following filling with concrete grout), including allowances for form material in anchor,
terminal, or toe trenches as applicable. See Article 23006.02, C, for the requirements
for concrete grout for the fabric formed concrete revetment.
2) Use fabric forms composed of synthetic yarns formed into a woven fabric. Ensure:
• Yarns used in the manufacture of the fabric are composed of nylon and/or
polyester.
• Forms are woven with a minimum of 50% textured yarns by weight (mass) to
improve adhesion to the concrete grout and to improve filtration.
DS-23006, Page 2 of 8
• Each layer of fabric conforms to the physical, mechanical, and hydraulic
requirements referenced herein.
• Fabric forms are free of defects or flaws that significantly affect their physical,
mechanical, or hydraulic properties.
3) Ensure fabric used to fabricate the fabric forms meets or exceeds the values shown
for the properties shown in Table DS-23006.02-1:
Table DS-23006.02-1: Fabric Form Minimum Property Requirements
Property Test Method Units Armor Unit Articulating
Block Mat
Composition of Yarns Nylon or Polyester Nylon or
Polyester
Mass Per Unit Area (double-layer) ASTM D 5261 oz/yd2 14 12
Thickness ASTM D 5199 mils 28 25
Mill Width in 76 76
Wide-Width Strip Tensile Strength
- Machine ASTM D 4595 lbf/in 190 140
- Cross ASTM D 4595 lbf/in 140 110
Elongation at Break
- Machine ASTM D 4595 % 20 20
- Cross ASTM D 4595 % 30 30
Trapezoidal Tear Strength
- Machine ASTM D 4533 lbf 180 150
- Cross ASTM D 4533 lbf 115 100
Apparent Opening Size (AOS) ASTM D 4751 US Std. Sieve 60 40
Flow Rate ASTM D 4491 gal/min/ft2 50 90
Notes:
1. Conformance of fabric to specification property requirements is based on ASTM D 4759.
2. All numerical values represent minimum average roll values (i.e., average of test results from any sample roll in a lot
must meet or exceed the minimum values). Sample lots according to ASTM D 4354.
4) Ensure mill widths of fabric are a minimum of 76 inches. Reinforce each selvage
edge of the top and bottom layers of fabric for a width of no less than 1.35 inches by
adding a minimum of six warp yarns to each selvage construction. Cut mill width rolls
to the length required. Separately join the double-layer fabric (bottom layer to bottom
layer and top layer to top layer) by means of sewing thread to form multiple mill width
panels with sewn seams on no less than 72 inch centers.
5) Ensure the following (field sewing will be permitted only to join the factory assembled
fabric form panels together):
• All factory-sewn seams face downward upon completion of the revetment.
• All seams sewn in the factory are not less than 90 pound-force per inch when
tested according to ASTM D 4884.
• All sewn seams and zipper attachments are made using a double line of U.S.
Federal Standard Type 401 stitch.
• All stitches are sewn simultaneously and are parallel to each other, spaced
between 0.25 inches to 0.75 inches apart.
• Each row of stitching consists of four to seven stitches per inch.
• Thread used for seaming is nylon or polyester, or both.
6) When cables are required, use cables constructed of high tenacity, low elongation,
continuous filament polyester fibers. Ensure cables have a core construction
consisting of parallel fibers contained within an outer jacket or cover. Ensure the
weight of the parallel core is 65% to 75% of the total weight of the cable.
7) Use cable of nominal size and rated breaking strength specified in the following
sections for the type and size of fabric formed revetment. Splice cables using
aluminum compression fittings selected so that the resultant cable splice from use of
a single fitting provides a minimum of 80% of the rated breaking strength of the cable.
DS-23006, Page 3 of 8
At each splice, use a minimum of two fittings separated by a minimum of 6 inches of
cable overlap. Upon completion of the revetment, encase all fittings by concrete grout
within the fabric form.
b. Articulating Block Mat.
1) Use fabric forms consisting of double-layer woven fabric joined together by narrow
perimeters of interwoven fabric into a matrix of rectangular compartments that form a
concrete articulating block mat. Use cords to connect the two layers of fabric at the
center of each compartment. Ensure the cords are interwoven in two sets of four
cords each, one set for the upper layer and one set for the bottom layer. Ensure each
cord has a minimum breaking strength of 160 pound-force when tested according to
ASTM D 2256.
2) Offset fabric form compartments one-half a compartment length, in the mill width
direction, to form a bonded concrete block pattern. The mill width direction for
articulating block mat is the flow direction shown on the plans unless otherwise
noted.
3) Ensure fabric form compartments each have four grout ducts, two on each side
parallel to the mill width direction, to allow passage of the concrete grout between
adjacent compartments. Two additional grout ducts, one on each side perpendicular
to the mill width direction, is permissible. Ensure the concrete grout filled, cross
sectional area of each grout duct is no more than 10% of the maximum filled cross
sectional area of the block transverse to the duct.
4) Install grout stops at predetermined mill width intervals to regulate the distance of
lateral flow of concrete grout. Use nonwoven filter fabric for the grout stop. Ensure
the grab tensile strength of the filter fabric is no less than 90 pound-force when tested
according to ASTM D 4632.
5) Install cables between the two layers of fabric and through the compartments in a
manner that provides for longitudinal and lateral binding of the finished articulating
block mat. Ensure two revetment cables perpendicular to mill width direction pass
through each compartment. Ensure one revetment cable parallel to the mill width
direction passes through the approximate center of each compartment.
6) Ensure the cables enter and exit the compartments through opposing grout ducts. As
an alternate, cable ducts may be provided for insertion of revetment cables between
compartments. Ensure the diameter of each cable duct is 1.0 inch maximum.
7) Completely embed in the concrete grout all cables within each compartment.
8) Ensure articulating block mat nominal finished dimensions and properties are those
listed in Table DS-23006.02-2:
Table DS-23006.02-2 - Articulating Block Mat Properties
Size 4 inch 6 inch 8 inch 10 inch 12 inch
Average Thickness, inches 4.0 6.0 8.0 10.0 12.0
Mass Per Unit Area, lb/ft2 45 68 90 113 135
Mass per Block, lb 88 188 325 563 844
Nominal Block
Dimensions, inches(c) 20x14 20x20 20x26 30x24 30x30
Cable Nominal Diameter,
inches 0.250 0.312 0.312(b) 0.375(d) 0.375(d)
Cable Average Breaking
Strength, lbf 3700 4500 4500(b) 7000(d) 7000(d)
Concrete Coverage(a),
ft2/yd3 75 50 38 30 25
(a) For information only.
(b) When the contract documents require 0.375 inches cable, the Average Breaking Strength is to be 7000
pound-force.
(c) Mill width direction x perpendicular to mill width direction.
(d) When the contract documents require 0.440 inches cable, the Average Breaking Strength shall be 10,000
pound-force.
DS-23006, Page 4 of 8
c. Armor Units/Concrete Bags.
1) Use fabric forms consisting of two layers of woven fabric sewn together. Ensure
when filled with concrete grout, they form a concrete Armor Unit (concrete bag).
2) Install self-sealing filling valves, suitable for use with an injection pipe at the end of a
pump hose for concrete grout, at predetermined locations.
3) When Armor Units are specified, use fabric forms similar to the typical unreinforced
bags produced by the manufacturers specified above.
4) When Armor Units Reinforced are specified, make the following modifications to the
typical unreinforced bag:
a) Use fabric form that is continuous along its length. The intent is to provide a
continuous width and thickness of fabric formed concrete along the substructure
unit being protected.
b) Install grout stops as required to regulate the distance of flow of concrete grout.
Use grout stop material consisting of nonwoven filter fabric. Ensure the grab
tensile strength of the filter fabric is no less than 90 pound-force when tested
according to ASTM D 4632.
c) Space longitudinal cables evenly across the cross section of the Armor Unit.
Splice them at joints. Ensure cables are a nominal 0.250 inches in diameter and
their rated average breaking strength is no less than 3700 pound-force. Ensure
cords connect the cables to the fabric form as required to position the cables
near the center of the finished armor thickness. The number of longitudinal
cables required and required nominal finished dimensions and properties are
shown in Table DS-23006.02-3:
Table DS-23006.02-3: Armor Unit Properties
Size -
Width Unfilled
Fabric Form
in
No. Longitudinal
Cables(b)
Filled Thickness
in
Volume of Concrete(a)
ft3/ft
Filled Thickness
in
Volume of Concrete(a)
ft3/ft
24 2 6 9
0.8 1.1
36 2 6 9
1.3 1.8
48 3 9 12
2.6 3.2
60 4 9 12
3.3 4.2
72 5 9 12
4.1 5.2
84 6 9 12
4.8 6.5
96 7 12 15
7.2 8.8
108 8 12 15
8.2 10.0
(a) For information only.
(b) For Reinforced Armor Units
B. Delivery.
1. Keep fabric forms dry and wrapped such that they are protected from the elements during
shipping and storage. If stored outdoors, ensure they are elevated and protected with a
waterproof cover that is opaque to ultraviolet light. Ensure fabric forms are labeled as per
ASTM D 4873.
DS-23006, Page 5 of 8
2. Submit a manufacturer’s certificate that the supplied fabric forms meet the criteria of this
specification, as measured in full accordance with the referenced test methods and
standards. Ensure the certificates include the following information about each fabric form
delivered:
• Manufacturer’s name and current address;
• Full product name;
• Style and product code number;
• Composition of yarns; and
• Manufacturer’s certification statement.
C. Concrete Grout for Fabric Formed Concrete Revetment.
1. Ensure materials for concrete grout for the fabric formed concrete revetment (concrete grout)
meet the following requirements:
Item Section (of the Standard
Specifications)
Portland Cement 4101
Fine Aggregate 4110, 4111 or 4112
Water 4102
Admixtures 4103
Fly Ash 4108
2. Ensure the concrete grout consists of a mixture of Portland cement, fine aggregate, water,
admixtures, and fly ash proportioned and mixed to provide a pumpable slurry. The Contractor
has the option of using grout fluidizer.
3. Proportion and mix the concrete grout so that its consistency when delivered to the concrete
pump has an efflux time of 8 to 12 seconds when passed through the 0.75 inch orifice of the
standard flow cone that is described in ASTM C 939.
4. Ensure the concrete grout has an air content of no less than 5% or no more than 10% of the
volume of the grout. Ensure the mix obtains a compressive strength of 2000 pounds per
square inch at 28 days when tested in conformance with Materials I.M. 315.
5. Provide the Engineer with a mix design meeting the above requirements. Produce a 1 cubic
yard test batch prior to utilizing the intended mix design. The Engineer will validate
consistency and air content of the test batch. Previously approved mix designs with a history
of strength and flow may be utilized without a test batch subject to approval of the Engineer.
Once the mix has been designated, do not change without the Engineer’s approval.
6. A mix utilizing at least 800 pounds of cementitious material with a required substitution of at
least 25% but no more than 35% type C fly ash may be used without strength testing before
placement. Efflux time and air content by unit weight determination will be measured by the
project Engineer prior to placement and at least once every 4 hours until the placement is
complete.
23006.03 CONSTRUCTION.
A. Equipment.
Obtain the Engineer’s approval for mixing and pumping equipment used in preparation and
handling of the concrete grout. Ensure proportioning and mixing equipment meets the
requirements of Articles 2001.20 and 2001.21 of the Standard Specifications. Ensure the mixing
capacity of mixers is sufficient to permit the intended pour to be placed without interruption.
Before the mixers are used, remove all oil or other rust inhibitors from the mixing drums, stirring
mechanisms, and other portions of the equipment in contact with the grout. Ensure pumping
DS-23006, Page 6 of 8
equipment has a variable flow rate to provide enough pressure for pumping without breaking the
fabric.
B. Site Preparation.
1. Construct areas on which fabric forms are to be placed to the lines, grades, contours, and
dimensions shown on the plans. Remove all obstructions, such as roots and projecting
stones. Bring areas below the allowable grades up to grade by placing compacted layers of
select material. The Engineer will specify the thickness of layers and the amount of
compaction. Where required by the contract documents, identity soft and otherwise
unsuitable subgrade soils, excavate, and replace with select materials according to the
Standard Specifications.
2. Excavate for and prepare aprons, anchors, terminal, and/or toe trenches according to the
lines, grades, contours, and dimensions shown on the plans. Immediately prior to placing the
fabric forms, the Engineer will inspect the prepared area. Do not place forms until the area
has been approved.
C. Fabric Form Placement.
1. General.
a. Place engineering fabric on the graded surface approved by the Engineer when required
by the contract documents. Place fabric forms over the engineering fabric, when required,
and within the limits shown on the plans. Anchor the fabric forms as required to prevent
displacement during curing of grout. Anchorages requiring connection to the structure
and not shown on the plans require approval by the Engineer prior to use.
b. Where fabric formed concrete is placed adjacent to a substructure unit, place the fabric
forms so that the filled fabric formed revetment is flush with the substructure unit. When
placing fabric form, allow for contraction of the fabric form during filling.
c. Make all field seams using two lines of U.S. Federal Standard Type 101 stitches. Use
nylon and/or polyester thread. Sew all seams face down. Zipper seams are permitted
unless noted otherwise in the contract documents. Ensure the finished strength of the
field seams complies with the manufacturer’s recommendations.
d. Splice all cables crossing a field seam according to Article 23006.02, A, 2. Upon
completion of the revetment, encase all splice fittings by concrete grout within the fabric
form.
e. Where fabric formed concrete units/mats lap on top of previously installed units, place 6
mils thick polyethylene sheeting on top of the underlying unit to prevent bonding prior to
placement of the engineering fabric and fabric forms for the succeeding layer.
f. Immediately prior to filling with the concrete grout, the Engineer will inspect the
assembled fabric forms. Do not pump grout until the fabric seams have been approved.
Do not allow unfilled fabric forms to be exposed to ultraviolet light (including direct
sunlight) for a period exceeding five calendar days.
2. Articulating Block Mat.
Before filling with concrete grout, join adjacent fabric form panels by field sewing or zippering
the two bottom layers of fabric together and the two top layers of fabric together. Use lap
joints only at locations shown in the contract documents.
3. Armor Units.
a. Join typical unreinforced Armor Units together following placement of concrete grout as
shown in the contract documents.
b. Before filling with concrete grout, join Reinforced Armor Units by field sewing or zippering
the two bottom layers of fabric together and the two top layers of fabric together to form a
continuous unit.
DS-23006, Page 7 of 8
D. Proportioning and Mixing Concrete Grout.
Accurately measure all materials by volume or weight (mass) as they are fed into the mixer.
Ensure the quantity of water is such as to produce a grout having a pumpable consistency. Mix
grout for no less than one minute. If agitated continuously, the grout may be held in the mixer or
agitator for up to 2.5 hours in temperatures below 70°F and up to 2 hours at higher temperatures.
If there is a lapse in a pumping operation, recirculate the grout through the pump or through the
mixer drum (or agitator) and pump.
E. Concrete Grout Placement.
1. General.
a. Pump concrete grout in such a way that excessive pressure on the fabric forms and cold
joints is avoided. A cold joint is defined as one in which the pumping of the concrete grout
into a given form is discontinued or interrupted for an interval of 45 minutes or more.
b. After the concrete grout has set, backfill and compact all anchor, terminal, and toe
trenches as specified by the Engineer.
c. Restrict foot traffic on the filled form to an absolute minimum for one hour after filling.
d. If a fabric formed concrete unit/mat is to bear on previously installed units, the lower units
shall be allotted a minimum of four hours of cure time before beginning installation of a
succeeding, vertically adjacent course of fabric formed unit(s). Abutting fabric formed
concrete units/mats may be installed immediately after placement of the preceding
unit(s).
e. Do not wash (spray) freshly pumped fabric formed concrete under pressure with water in
an effort to clean or remove spills from its surface. Maintain the cement film that bleeds
through the top layer of the fabric form through curing on finished surfaces exposed to
sunlight. Should the film be removed in these areas, repair the film by spreading a thin
layer of a water-cement paste over the effected area.
2. Articulating Block Mat.
Following the placement of the fabric forms, cut small slits (of the minimum length to allow
proper insertion of the filling pipe) in the top layer of the fabric form to allow the insertion of
the filling pipe at the end of the concrete grout pump hose. Pump concrete grout between the
top and bottom layers of fabric, filling the forms to the recommended thickness and
configuration. Temporarily cross holes in the fabric forms left by the removal of the filling pipe
by inserting a piece of nonwoven fabric or similar material. Remove the nonwoven fabric
when the concrete grout is no longer fluid. Clean and smooth the grout surface at the hole by
hand.
3. Armor Units.
a. Following the placement of the fabric form, insert the filling pipe at the end of the concrete
grout pump hose through the self-sealing filling valve. Pump concrete grout between the
top and bottom layers of fabric, filling the forms to the recommended thickness and
configuration.
b. When the contract documents require joining of adjacent Armor Units by inserting
reinforcement bar dowels or staples into the Armor Units, insert the dowels or staples into
the filled unit(s) no less than one half hour and not more than one hour after filling of the
unit, unless the Engineer directs otherwise. When the contract documents require joining
of vertically adjacent Armor Units, drive reinforcing dowels into the lower unit in the time
frames specified in this paragraph. Place the vertically adjacent fabric form over the
reinforcing dowels. Force the dowels through the bottom layer of the vertically adjacent
fabric form prior to filling that form.
F. Cold Weather Protection.
1. Concrete grout shall not be placed in forms laying on frozen ground.
DS-23006, Page 8 of 8
2. Grout filled fabric formed concrete less than 48 hours old shall be protected as follows:
Table DS-23006.04-1: Grout Filled Fabric Formed Concrete Protection
Night Temperature
Forecast
Type of Protection
32°F to 25°F One layer of burlap or a 3/4 inch layer of soil.
Below 25°F Three layers of burlap or equivalent commercial
insulating material, or a 1 1/2 inch layer of soil.
3. Protection shall completely cover the fabric formed concrete to the water line on the finished
fabric formed concrete surface. Protection of fabric formed concrete below water is not
required.
23006.04 METHOD OF MEASUREMENT.
A. Fabric Formed Concrete Revetment.
Square yards shown in the contract documents of the type specified for each installation.
B. Engineering Fabric.
Article 2507.04 applies.
C. Concrete Grout.
Article 2507.04 applies.
23006.05 BASIS OF PAYMENT.
A. Fabric Formed Concrete Revetment.
1. Per square yards for the type specified.
2. Payment is full compensation for all work, including furnishing the forms and all equipment,
tools, and labor necessary to place the forms ready for filling with grout and all required work
following filling. The work includes but is not limited to joining field seams, cable splices,
plastic for lap areas, and reinforcing bars to join Armor Units.
3. Unless otherwise noted in the contract documents, payment is also full compensation for all
bank shaping, excavation, and backfilling necessary to complete the work in conformance
with the contract documents.
B. Engineering Fabric.
Article 2507.05 of the Standard Specifications applies.
C. Concrete Grout.
Article 2507.05 of the Standard Specifications applies.
- Package Files
- Name
- 20OCT013\Plan\82-1827-698\82-1827-698.pdf
- Bytes
- 101750200
- Name
- 20OCT013\Prop\DS-23006.pdf
- Bytes
- 84343
- Name
- 20OCT013\Prop\estprop013.pdf
- Bytes
- 306911
- Name
- 20OCT013\Prop\SP-236073.pdf
- Bytes
- 137666
- Name
- 20OCT013\Prop\SP-236074.pdf
- Bytes
- 151988
- Package Pages
- 22
- Categorized By
- llm
- Package Scope Docs
- 2
- Package Manifest Only
- No
Iowa Department of TransportationIssuing agency·Iowa·via a public procurement portal