海砂对混凝土耐久性能的影响研究综述

Review on the influence of sea sand on the durability of concrete

海砂混凝土是指采用海砂为骨料制备而成的混凝土。随着河砂资源的日趋减少,致使建筑用砂逐渐短缺,利用海砂来制备混凝土,可以一定程度缓解建筑用砂短缺的压力。介绍了海砂中氯离子、硫酸根离子和贝壳类等有害物质对混凝土耐久性能的影响。针对目前海砂混凝土在开发利用方面存在的问题,概述了海砂淡化、钢筋保护法和采用新型耐腐材料(FRP)3种改进措施。最后就海砂混凝土研究现状提出了3点建议,以期为未来的研究方向提供参考。

Sea sand concrete refers to concrete prepared by using sea sand as aggregate.With the decrease of river sand resources,the construction sand is in short supply.Using sea sand to prepare concrete can relieve the pressure of construction sand shortage to some extent.It introduces the effects of harmful substances such as chloride,sulfate and shellfish on the durability of concrete in sea sand.Aiming at the current problems in the development and utilization of sea sand concrete,three improvement measures including sea sand desalination,steel bar protection method and the use of new corrosion-resistant materials(FRP)are outlined.Finally,three suggestions are put forward on the research status of sea sand concrete in order to provide reference for future research directions.