HEMC对硫铝酸盐水泥砂浆性能的影响  

Influence of HEMC on Properties of Sulphoaluminate Cement Mortar

作　　者：李建[1,2] 王肇嘉 黄天勇[3] 王茹[1,2] 王思云[1,2] LI Jian;WANG Zhaojia;HUANG Tianyong;WANG Ru;WANG Siyun(Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China;School of Materials Science and Engineering, Tongji University, Shanghai 201804, China;State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing Building Materials Academy of Science Research, Beijing 100041, China)

机构地区：[1]同济大学先进土木工程材料教育部重点实验室,上海201804 [2]同济大学材料科学与工程学院,上海201804 [3]北京建筑材料科学研究总院有限公司固废资源化利用与节能建材国家重点实验室,北京100041

出　　处：《建筑材料学报》2021年第1期199-206,共8页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51872203,51572196);中德科学中心资助项目(GZ1290)。

摘　　要：研究了固定流动度下高、低2种取代度的羟乙基甲基纤维素(HEMC)对硫铝酸盐水泥砂浆性能的影响.结果表明:随着HEMC掺量的增加,硫铝酸盐水泥砂浆的需水量和凝结时间大幅增加,湿密度和强度大幅降低;HEMC掺量对硫铝酸盐水泥砂浆抗折强度的影响显著小于其抗压强度;相对于低取代度HEMC,高取代度HEMC改性硫铝酸盐水泥砂浆具有稍低的需水量、湿密度和强度以及相近的凝结时间;HEMC的加入延缓了初期声波传播速度的增长,显著延长了新拌砂浆的可使用时间,降低了最终声波在砂浆内部的传播速度,且其声波传播速度同时受HEMC掺量和取代度的影响;HEMC改性硫铝酸盐水泥砂浆强度与湿密度以及声波的传播速度均具有良好的线性相关性.The effects of hydroxyethyl methyl cellulose(HEMC)with high and low substitution degrees on the properties of sulphoaluminate cement mortar under fixed fluidity were studied.Test results show that water demand and setting time increase significantly while wet density and strength decrease significantly with the increase of HEMC content.Flexural strength is less influenced than compressive strength by HEMC content.Compared with the low substitution degree HEMC,high substitution degree HEMC to some extent leads to lower water demand and wet density together with lower strength and similar setting time of sulphoaluminate cement mortar.Incorporation of HEMC slows down the acceleration of sound velocity at early stage which is in favor of pot life,and leads to the decrease of final sound velocity.Moreover,the acoustic wave propagation speed is affected by the content and the degree of substitution of HEMC.The strength of HEMC modified sulphoaluminate cement mortar has good liner correlation with both sound velocity and wet density.

关 键 词：硫铝酸盐水泥 羟乙基甲基纤维素 取代度 强度 超声法 

分 类 号：TU528.01[建筑科学—建筑技术科学]