Research on Influence of Chloride Ion in Sea Sand on the Performance of Concrete

Abstract

Sea sand concrete is a kind of concrete in which mixed sea sand as fine aggregate, which is large-scale application in the coastal areas in recent years, especially in Ningbo area. The sea sand solves the problem of river sand shortage, coupled with cheaper price, most of the ready-mixed concrete companies are willing to use desalted sea sand instead of river sand. Many companies even are using sea sand without any treatments.In Ningbo sea sand concrete using wide range of usage is not optimistic. This survey and analysis in Ningbo area physical characteristics of concrete using sea sand and sea-sand. On this basis, chloride simulating sea sand, mixed with desalted sea sand, not desalted sea sand mortar strength measurement, the concrete strength rule were analyzed, and discovered the early strength for the sea sand concrete by the presence of chloride.

Carbonation of concrete made with dredged marine sand and its effect on chloride binding

“…Using unwashed DMS may lead to serious degradation in concrete quality or steel corrosion in RC structures [1][2][3][4]. At present, the use of DMS in RC structures without washing has become a significant engineering quality problem in coastal areas of China [5].…”