聚合物及环境因素对薄层砂浆早期塑性收缩的影响  

Influence of Polymer and Environment on Plastic Shrinkage in Mortar

作　　者：蹇守卫[1] 孔维 马保国[1] 张吕东 

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [2]海工结构新材料及维护加固技术湖北省重点实验室,武汉430070

出　　处：《武汉理工大学学报》2014年第7期17-21,共5页Journal of Wuhan University of Technology

基　　金：国家科技支撑计划(2011BAJ02B01);中央高校基本科研业务费专项资金资助项目(2012-Ⅳ-031)

摘　　要：提出了一种利用视频显微镜技术来测量薄层砂浆早期塑性收缩的新方法,研究了聚合物(纤维素醚、可再分散乳胶粉)、环境因素(温度、风速)对薄层砂浆早期塑性收缩的影响。结果表明:随着纤维素醚掺量的增大,塑性收缩呈减小趋势,但当纤维素醚达到一定量时,这种减缩效果减弱。同时纤维素醚种类不同,对砂浆塑性收缩影响不同。可再分散乳胶粉可以有效地抑制砂浆的塑性收缩,但是随着胶粉掺量的增加,其抑制砂浆塑性收缩的能力有所下降。温度对砂浆塑性收缩的影响很大,温度控制不当很容易造成砂浆的收缩开裂。风速相比于温度来讲不如温度影响大,但较大风速下会加速砂浆收缩,也会加剧砂浆的塑性收缩开裂。This paper presented a new way that used video microscopy to measure the early plastic shrinkage of thin layer mortar,and studied the influence of polymers（cellulose ethers,redispersible powder）,environmental factors（temperature,wind speed）on the early plastic shrinkage.The experimental results show that with the increasing content of cellulose ether,plastic shrinkage decreases,until a certain amount of cellulose ether,such reduced shrinkage effect weakens.At the same time,different types of cellulose ethers have different influences on plastic shrinkage of mortar.Redispersible powder can effectively suppress plastic shrinkage of mortar,but with its content increasing,its ability to inhibit the plastic shrinkage of mortar declines.Temperature has a great influence on plastic shrinkage,and uncontrolled temperature can cause improper mortar shrinkage cracking.Wind speed is not better than the temperature in terms of plastic shrinkage impact.

关 键 词：纤维素醚 可再分散乳胶粉 塑性收缩 温度 风速 

分 类 号：TU528.57[建筑科学—建筑技术科学]