AGENT FOR PROVIDING SALT BLOCKING PROPERTY USED FOR CEMENT, CEMENT COMPOSITION, CEMENT MORTAR AND CONCRETE

摘要

PURPOSE:To obtain an agent for providing a salt blocking property, useful for a cement composition capable of forming structure having excellent dry shrinkage ratio, salt blocking property and strength by using a silane compound having a specific alkyl and hydrolyzable group as a main component. CONSTITUTION:The agent for proving a salt blocking property containing a silane compound having an alkyl group being 5-18 in carbon numbers constituting the alkyl group and hydrolyzable group as an active component. A compound having four groups consisting of alkoxy groups and 5-18C hydrocarbon groups bonded to one Si is used as the compound having alkyl group and hydrolyzable group in the above-mentioned providing agent. Even if an alkylsilane compound having two alkyl groups bonded to one silicon compound is used, good salt blocking properties and low shrinkage can not be provided to the cement, since the compound is not hydrolyzed in a cement mortar and concrete. Even if an alkoxysilane compound wherein four all groups are alkoxy groups is used, good salt blocking property can not be provided to the cement.