FAST-SETTING REPAIR MORTARS
FOR STRUCTURAL COMPONENTS
Fast-setting repair mortars used for concrete structural components shall meet the requirements of applicable Iowa Department of Transportation Specifications. These mortars shall be able to be used on horizontal, vertical and overhand locations. Acceptance of fast-setting repair mortars for use on Department of Transportation projects will be on the basis of manufacturer and brand name approval. Approved manufacturers and brands of fast-setting repair mortars for structural components are listed in the Materials Approved Products Listing Enterprise (MAPLE).
To obtain approval for fast-setting repair mortars, the manufacturer shall submit the following items to the Office of Construction and Materials 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 for the submitted product from the National Transportation Product Evaluation Program (NTPEP).
Product approval is based on satisfactory evaluation of the NTPEP test report. The minimum requirements for approval are listed in the table below:
|
|
AASHTO/ASTM Test Method |
Cure Time |
Requirement |
|
Initial Set, minutes, minimum |
T131 or C403 |
|
12 |
|
Compressive Strength, psi, minimum |
T22 or T106 |
1 day 7 days |
3,000 4,000 |
|
Bonding, Slant Shear or Direct Tension, psi, minimum |
C882 C1583 |
1 day 28 days |
1,000 300 |
|
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, maximum |
T358 T277 |
28-day moist cure 28-day moist cure |
29 k-ohm-cm 1,500 coulombs |
When aggregate extension is allowed for a product, both neat and extended mixes shall meet the criteria listed in the table.
Approved manufacturers and brand names of fast-setting repair mortars for concrete structural components will be listed in Appendix A.
Magnesium phosphate-based materials will not be allowed due to its poor freeze-thaw durability.
The manufacturer shall file a certification with the Office of Construction and Materials 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 Office of Construction and Materials may sample and test fast-setting repair mortars to verify their capability of meeting the approval requirements.