NONSHRINK HYDRAULIC CEMENT GROUTS
Acceptance of nonshrink hydraulic cement grouts will be on the basis of approved brands and satisfactory certifications. These materials are approved for use when the plans or specifications permit their use for grouting purposes. Brand names must be identifiable on the containers. Approved brands are listed in Appendix A.
When a grout is to be used in contact with stressed tendons or other corrosion-sensitive, load-bearing structural members, the user shall make sure the material meets relevant chloride, nitrite, sulfide and sulfate requirements, and any other material limitations imposed by the applicable Iowa DOT specifications. As noted, some grouts listed on Appendix A have the acid-soluble chloride content lower than 0.08% by weight per ASTM C 1152 or AASHTO T 260.
Prior to being placed on the list of approved brands, one or more products per manufacturer will be evaluated by the Office of Materials. The evaluation will consist of testing the grout for strength and shrinkage. Approval of products shall consist of the following:
A. Compressive Strength ASTM C 109
Plastic State 1 day 3000 psi
7 days 5000 psi
Fluid State 1 day 1000 psi
7 days 3500 psi
Plastic State ASTM C 827 In plastic state, the grout
(The manufacturer shall must not shrink, and the
provide independent test grout must not expand by
result of C 827 for evaluation) more than 4.0%.
Hardened State ASTM C 1090 0.3% Maximum
When casting specimens for above tests, consistency shall meet the following requirements:
Plastic State ASTM C 1437 100 - 125
Fluid State ASTM C 939/IM 375 10 - 30 seconds
If the manufacturer can provide independent test results, some of the above tests may be waived.
The manufacturer shall file a certification with the Office of 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 by the Office of Materials.
MONITOR SAMPLING & TESTING
The Office of Materials may sample and test hydraulic cement grouts to verify their capability of meeting the approval requirements