30 products Find ASTM C products and abstract using the BuildSite database. Get the right product for the spec. Cement Grout (Nonshrink). • ASTM C Standard Test Method for Flow of Hydraulic Cement. Mortar. • ASTM E Standard Test Methods for Strength of. ASTM C/CM: Standard Specification for Packaged Dry, Hydraulic- Cement Grout (Nonshrink).
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Is it possible to improve your non-shrink grout specification and lower your in-place grout cost? Non-shrink grouts play a key role in the asfm stability of most construction projects. Their function is three fold: ASTM-C was initially introduced to the public in It has since undergone a few revisions and continues to be improved upon.
C classifies grouts into three categories: Grade A, volume control of grout caused by expansion before hardening occurs; Grade B, volume control caused by expansion after grout hardens; Grade C, volume control caused by a combination of both mechanisms.
In addition to height change, critical elements of working time placeability and compressive strength are measured at varied temperature ranges and at varied consistencies or water content. The grout is tested at the manufacturer’s maximum allowed water-to-dry solids ratio and is rated as plastic, flowable, or fluid.
Grout consistency is tested both after initial mixing and at the end of the grout’s stated working time at the manufacturer’s allowed temperature ranges. Compressive strength tests are run at d1107 and minimum temperatures both initially and at the end of working time. For compliance, a grout must achieve a conservative day strength asgm psi Most specifications require higher strength. A good rule of thumb is an over design factor of 1. This would require the non-shrink grout to have compressive c11107 in the to psi range.
Although C addresses grout limitations with respect to temperature, consistency, and working time, it fails c117 set limits for these parameters, allowing manufacturers to do so. A grout with very narrow limits may comply with C, but such narrow parameters could result in failure.
For example, a product that is non-shrink at 20 degrees C 70 degrees F may not be at 32 degrees C 90 degrees F. In other words, a grout that is working well on a project in Philadelphia, may not work in Phoenix.
C does not address bleeding. A grout that bleeds free water due to consistency or temperature results in a void under the base plate or surface once the water has evaporated. The higher expansion allowed for Grade A grouts can result in lower compressive strengths and may not compensate for long-term drying shrinkage. Grade C grouts will perform as long as they have adequate post-hardening expansion to counteract drying shrinkage over a wide temperature range.
Concrete News: ASTM C
Will the grout offer adequate load support when the machine is running or when the precast or columns rest squarely on it? Does the grout shrink in 28 days?
Only B and C grouts address post-hardening shrinkage. Specifying a grout material to comply with the most stringent requirements for fluid consistency, working time, and temperature range reduces potential problems on projects that experience those extremes. The following is a short-form specification for non-shrink grout. Grout shall be prepackaged, non-metallic, and non-gaseous. Thirty-minute-old grout shall flow through the flow cone after slight agitation, in asym of 4 degrees C 40 degrees F to 32 degrees C 90 degrees F.
Grout shall be bleed free and attain 7, psi Certified independent test data required.
However, even the best grouts may fail if not installed correctly. In addition to a good specification and an excellent product, the proper preparation, placement and protection of these materials is critical.
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