SUPPORTED CARBONIC ACID ESTERS USEFUL AS SET ACCELERATORS AND THIXOTROPIC AGENTS IN CEMENT

摘要

Cementitious compositions are prepared using a dry, flowable admixture containing an ester of carbonic acid such as propylenecarbonate and a solid, particulate support which is non-reactive toward the ester such as silica fume. Such admixtures accelerate the setand increase the thixotropy of unhardened mixtures containing hydraulic cement and water, yet can be readily handled and stored in stableform until ready to be used.