海砂水泥砂浆力学性能与耐久性能研究

Research on mechanical properties and durability of sea sand cement mortar

随着近些年来建筑混凝土用料需求增长导致出现河砂被过度开采从而出现自然恢复率小于利用率的现象,而海水中存在的海砂自然成为了河砂的替代品。对淡化海砂后形成水泥砂浆与普通河砂砂浆进行对比,在力学性能的抗压与抗折强度以及抗渗性、抗硫酸盐腐蚀性及抗冻融性等耐久性进行了实验研究。结果表明:在28 d养护期条件下,随着海砂代替河砂所制备的水泥砂浆比例增大,水泥砂浆试件的抗折强度、抗压强度均呈现负相关,且第28 d时海砂水泥砂浆试件的抗折强度达到最小值为3.6718 MPa,抗压强度也达到最小值为20.4578 MPa;随着海砂代替河砂比例增加进行对照实验,砂浆试件的抗渗性、抗冻融性有所降低,而抗硫酸盐腐蚀性有所提高。

With the increase in the demand for construction concrete materials in recent years,river sand has been over-exploited and the natural recovery rate is less than the utilization rate.The sea sand in the seawater has naturally become a substitute for river sand.This article mainly compares the performance of cement mortar formed after desalination of sea sand and ordinary river sand,and compares the basic mechanical properties of compressive strength and flexural strength,as well as durability,such as impermeability,sulfate corrosion resistance,and freeze-thaw resistance.The results show that under the curing period of 28 days,as the proportion of cement mortar prepared by increasing sea sand instead of river sand increases,the flexural strength and compressive strength of the cement mortar specimens are negatively correlated,and the minimum flexural strength of the mortar specimen of the sea sand cement was 3.6718 MPa,and the minimum compressive strength is 20.4578 MPa;with the increase in the proportion of sea sand instead of river sand,a control experiment is conducted.The impermeability and freeze-thaw resistance of the mortar specimen is reduced,and the sulfate corrosion resistance is improved.