海砂河砂混合砂浆物理及力学性能试验研究与分析  

Experimental study and analysis on physical and mechanical properties of sea sand and river sand mortar

作　　者：邓雪莲 虞爱平[1,2] 黄正文 DENG Xuelian;YU Aiping;HUANG Zhengwen(Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin 541004,China;College of Civil and Architecture Engineering,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]广西建筑新能源与节能重点实验室,广西桂林541004 [2]桂林理工大学土木与建筑工程学院,广西桂林541004

出　　处：《混凝土》2021年第11期112-116,共5页Concrete

基　　金：国家自然科学基金(51968014);广西建筑新能源与节能重点试验室主任基金(桂科能19-J-21-27);广西高校中青年教师科研基础能力提升项目(2019KY0293);广西高校中青年教师科研基础能力提升项目(2020KY06029)。

摘　　要：受河砂资源限制,为探寻海砂替代河砂应用于建筑工程的可能性及程度,采用2%、5%、10%、20%四种取代率,以海砂中氯离子含量和贝壳含量为试验参数,研究海砂部分取代河砂后混合砂浆物理及力学性能,并与普通水泥砂浆各项指标进行对比。结果表明:掺入海砂后,混合砂浆密度和流动性降低、分层度提高、凝结时间缩短;氯离子有助于混合砂浆早期强度提高,其中海砂取代率为20%时,氯离子对砂浆早期强度增强效果最明显;贝壳对混合砂浆抗压、抗折强度有不利影响,且随海砂取代率提高,不利影响越明显;试验中海砂最佳取代率为10%,各项性能指标与普通水泥砂浆相差不大,满足建筑工程标准。Limited by river sand resources,in order to find out the possibility and extent of replacing river sand with sea sand,4 substitution rates of 2%,5%,10%and 20%were adopted.The physical and mechanical properties of mixed mortar after sea sand partially replacing river sand were studied by using chloride ion content and shell content as test parameters.The results showed that the mixing mortar has lower density,lower fluidity,higher stratification and shorter setting time.After mixing with sea sand,chloride ions were helpful to the early strength of mixed mortar.When the replacement rate of sea sand is 20%,the effect of chloride ion on early strength enhancement of mortar is most obvious.The shell has adverse effects on the compressive and flexural strength of the mixed mortar,and the more obvious the adverse effects are with the increase of the replacement rate of the sea sand.The optimum replacement rate of the sea sand is 10%,and the performance indexes are not different from the ordinary cement mortar,which meets the construction engineering standards.

关 键 词：海砂 混合砂浆 力学性能 氯离子 贝壳 

分 类 号：TU528.01[建筑科学—建筑技术科学]