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