Sulfate Specifications as a Constraint to Gypsum Addition to Cement and Possible Replacement of Gypsum as an Additive. Final Report, Phase I

摘要

The effects of high sulfate contents in portland cements were evaluated by studying pure cement compounds and specially designed cements prepared from a variety of commercial portland cement clinkers. Results indicate that use of a combination of admixtures can reduce the deleterious expansive effects due to both internal and external sulfate attack. In particular, a combination of alkali sulfates and sucrose can help reduce expansion in over-sulfated cement pastes. However, a combination of limestone and gypsum can help reduce the susceptibility of mortars to external sulfate attack, and the energy consumption per ton of cement will also be reduced. (ERA citation 08:015253)