Because of the increasing demand for construction and the limited river sand resources in China, using sea sand to prepare sea sand masonry mortar (SSMM) in coastal areas can save river sand resources, but it will have a certain impact on the performance of mortar. Sea sand with different chloride ion (Cl − ) content and replacement ratio of manufactured sand were prepared. The effects of hydroxypropyl methyl cellulose ether (HPMC), Cl − content and replacement ratio of manufactured sand on the workability, mechanical properties, cement hydration and pore structure of SSMM were studied. The results show that HPMC can increase the consistency and water retention of SSMM, decrease the 2-h consistency loss rate and prolong the setting time of SSMM. Cl − in sea sand has different effects on the mechanical properties of SSMM. Sea sand partly replaced by manufactured sand has a positive effect on the mechanical properties of SSMM. Cl − has an obvious promoting effect on cement hydration. Cl − in sea sand can optimize the pore size distribution of SSMM, but increase the total porosity, total specific surface area and pore connectivity of SSMM. Sea sand partly replaced by manufactured sand makes the total pore volume of SSMM decrease and optimizes the pore structure of SSMM.

中文翻译：

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氯离子含量及人工砂置换率对海砂砌筑砂浆性能的影响

由于我国建筑需求的增加和河砂资源有限，在沿海地区用海砂制备海砂砌筑砂浆(SSMM)可以节约河砂资源，但会对砂浆的性能产生一定的影响。制备了不同氯离子（Cl - ）含量和人工砂置换率的海砂。研究了羟丙基甲基纤维素醚（HPMC）、Cl - 含量和人工砂置换率对SSMM的和易性、力学性能、水泥水化和孔隙结构的影响。结果表明HPMC可以提高SSMM的稠度和保水性，降低2h稠度损失率，延长SSMM的凝结时间。海砂中的Cl - 对SSMM的力学性能有不同的影响。部分由人工砂替代的海砂对 SSMM 的力学性能有积极影响。Cl - 对水泥水化有明显的促进作用。海砂中的Cl - 可以优化SSMM的孔径分布，但增加SSMM的总孔隙度、总比表面积和孔隙连通性。人工砂部分替代海砂，使SSMM的总孔隙体积减小，优化了SSMM的孔隙结构。