The limits of chloride and sulphate content in sand for concrete and the possibility of using treated marine sand for concrete

Abstract

This article presents a literature review of the limits of chloride and sulfate content in fine aggregate for concrete specified in the standards of our country and some other countries around the world. The review results show that the limit of chloride content in sand for concrete according to technical requirements for sand of countries around the world is different and ranges from 0,01% to 0,15% by weight of sand. The limit of sulfate content specified in the standards of several countries is similar, less than 1%. To evaluate the possibility of using sea sand for concrete, the author carried out the sieve analysis of sea sand collected in the sea at Tuy Hoa City, then proceeded to treat sea sand by using hot water and by river flow. Research results show that grain size of sea sand meets the technical requirements of sand for mortar and concrete, the chloride content in treated sea sand is less than the permissible limit according to TCVN 7570: 2006.