INSPECTION & ACCEPTANCE
RAPID-SETTING CONCRETE PATCHING MATERIALS
Acceptance of rapid-setting concrete patching materials will be on the basis of approved brands and satisfactory test results. These materials are approved for use when the plans and/or specifications permit their use for surface patching purposes.
Brand names must be identifiable on the packages. Material shall be packaged in a multi-wall moisture resistance paper bag. Shelf life shall be indicated on each packaged bag (by expiration date). Mixing sequence and addition of mixing water for each material shall be as directed and recommended by each manufacturer. When coarse aggregate is used, its type and quantity shall follow manufacturer recommendations and a minimum of Class 2 durability rating. Approved manufacturers and brands of rapid-setting concrete patching materials are listed in the Materials Approved Products Listing Enterprise (MAPLE) as Appendixes A and B for two types of applications. The products listed in Appendix B can also be used for the Appendix A applications.
To obtain approval of a rapid-set concrete patching material, the manufacturer shall submit the following items to the Construction and Materials Bureau in Ames:
1. Product identification including brand name,
2. Complete manufacturer's recommendation for usage,
3. A copy of test report of the submitted product from the National Transportation Product Evaluation Program (NTPEP), and
4. A current Materials Safety Data Sheet (MSDS).
Appendix A consists of rapid set patching materials for pavement patching. Appendix B consists of shrinkage compensated rapid set patching materials for dowel bar retrofit projects or bridge deck patching. Product approval is based on satisfactory evaluation of the NTPEP test report. The minimum requirements for approval are listed in the following table. When aggregate extension is allowed for a product, both neat and extended mixes shall meet the criteria listed in the table.
|
|
AASHTO/ASTM Test Method |
Cure Time |
Appendix A |
Appendix B |
|
Compressive Strength, psi, minimum |
T22 or T106 |
3 hours 24 hours |
1,000 3,000 |
3,000 5,000 |
|
Bonding: Slant Shear or Direct Tension, psi, minimum |
C882 C1583 |
1 day 28 days |
1,000 260 |
1,200 300 |
|
Durability Factor, minimum |
T161 Method A or Method B |
14-day moist cure |
70% (300 cycles) |
90% (300 cycles) |
|
Length Change, allowable |
T160
or C531 for High Polymer Content Repair Mixes |
28 days in water 28 days in air 14 Days in air Thermal expansion coef. |
+0.15%1 -0.15%2 -0.10%2 5.0 micro-strain/oF |
+0.15%1 -0.05%2 NA NA |
|
Resistivity or Rapid Chloride Permeability, maximum |
T358 or T277 |
28-day moist cure 28-day moist cure |
29 k-ohm-cm, min 1,500, max coulombs |
23 k-ohm-cm, min 1,200, max coulombs |
Note 1: Maximum allowable increase after 28 days in water
Note 2: Maximum allowable decrease after 28 days in air
Magnesium phosphate-based patching materials will not be allowed in Appendix B for the dowel bar retrofit application.
Manufacturer shall provide the acid-soluble chloride result from an independent test agency for review.
Bulk cementitious material may be used with coarse aggregate and sand, meeting Division 41, in a mobile mixer for patching and dowel bar retrofit projects. Cement content for mixes shall be at minimum used in bagged product or a minimum of 650 pounds per cubic yard.
Approval of a product may be withdrawn at any time because of deficient test results, inadequate documentation, and/or lack of product identification.
The manufacturer shall file a certification at the beginning of each calendar year stating that the material supplied during that year is identical with the formulation previously tested and approved by the Construction and Materials Bureau.
The Construction and Materials Bureau may sample and test rapid-setting concrete patching materials to verify their capabilities of meeting the approval requirements.