CONCRETE STRUCTURAL REPAIR MATERIALS

 

GENERAL

Concrete structural repair materials shall meet the requirements of applicable Iowa Department of Transportation Specifications. These materials shall be able to be used on horizontal, vertical and overhand locations. Acceptance of the concrete structural repair materials for use on Department of Transportation projects will be on the basis of manufacturer and brand name approval. Approved manufacturers and brands of concrete structural repair materials are listed in the Materials Approved Products Listing Enterprise (MAPLE): Appendix A for horizontal repair and Appendix B for overhead and vertical repair.

 

APPROVAL

To obtain approval for structural repair materials, the manufacturer shall submit the following items to the Construction and Materials Bureau in Ames, Iowa:

 

1.    Product identification including brand name and product number,

 

2.    Complete manufacturer recommendations for usage,

 

3.        Current Safety Data Sheet (SDS), and

 

4.        A copy of test report from the National Transportation Product Evaluation Program (NTPEP) for rapid set materials,

 

5.        A copy of test report from independent laboratory for non-rapid set materials. The report should include test results required in the table below.

 

Product approval is based on satisfactory evaluation of the NTPEP or independent test report. The minimum requirements for approval are listed in the table below:

 

 

AASHTO/ASTM Test Method

 

Cure Time

 

Requirement

Compressive Strength,

psi, minimum

T22 or T106

1 day

 

7 days

3,000 for Appendix A

2,000 for Appendix B

4,000

Bonding, Slant Shear or

Direct Tension, psi, minimum

C882

C1583

1 day

28 days

1,000

260

Durability Factor, minimum

T161, Method A or Method B

14-day moist cure

70%

(300 cycles)

Length Change,

allowable

T160

28 days in water

28 days in air

+0.15%

-0.15%

Resistivity or

Rapid Chloride

Permeability

T358

T277

28-day moist cure

28-day moist cure

29 k-ohm-cm, min

1,500 coulombs, max

 

When aggregate extension is allowed for a product, both neat and extended mixes shall meet the criteria listed in the table.

 

CERTIFICATION

The manufacturer shall file a certification with the Construction and Materials Bureau at the beginning of each calendar year stating that the material supplied during that year is identical with the formulation previously tested and approved.

 

MONITOR SAMPLING & TESTING

The Construction and Materials Bureau may sample and test structural repair materials to verify their capability of meeting the approval requirements.