NONSHRINK HYDRAULIC CEMENT GROUTS

 

GENERAL

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 manufacturers and brands of nonshrink hydraulic cement grouts are listed in the Materials Approved Products Listing Enterprise (MAPLE).

 

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.  

 

ACCEPTANCE

Prior to being placed on the list of approved brands, a product will be tested and evaluated by the Office of Construction and Materials based on the following criteria:

 

A. Compressive Strength

ASTM C 109

 

 

 

 

Fluid or Flowable State

1 day

1000 psi, minimum

 

7 days

3500 psi, minimum

 

 

 

B. Height Change (Plastic or Flowable State)

 

 

 

Early Age

ASTM C 827

 

 

(The manufacturer shall provide independent test result of C 827 for evaluation)

At final set, the grout must not shrink, and the grout must not expand by more than +4.0%.

 

 

 

Hardened Grout

ASTM C 1090

+0.3% maximum and 0.0% minimum at 1, 3, 14 and 28 days

 

When casting specimens for above tests, consistency shall meet the following requirements:

 

Fluid State

ASTM C 939/IM 375

10 - 30 seconds

Flowable State

ASTM C 1437

125 - 145

Plastic State

ASTM C 1437

100 - 125

 

If the manufacturer can provide independent test results, some of the above tests may be waived.

 

Magnesium phosphate-based materials will not be allowed due to its poor freeze-thaw durability and very limited working time.

CERTIFICATION

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.

 

MONITOR SAMPLING & TESTING

The Office of Construction and Materials may sample and test hydraulic cement grouts to verify their capability of meeting the approval requirements