高温养护对地聚物砂浆强度和收缩的影响  

Effect of high-temperature curing on strength and shrinkage of geopolymer mortar

作　　者：王永宝 兰雪江 史晨曦 张翛 WANG Yongbao;LAN Xuejiang;SHI Chengxi;ZHANG Xiao(College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学土木工程学院,山西太原030024

出　　处：《广西大学学报（自然科学版）》2023年第3期550-557,共8页Journal of Guangxi University（Natural Science Edition）

基　　金：山西省基础研究计划项目(20210302123082);中国博士后科学基金项目(2020M670698);山西省高等学校科技创新项目(2019L0295);山西交通控股集团项目(20-JKKJ-17,18-JKKJ-05);桥梁结构健康与安全国家重点实验室开放研究基金项目(BHSKL20-02-GF)。

摘　　要：为了研究高温养护对地聚物砂浆的强度和收缩等性能的影响,制作了矿渣、粉煤灰和赤泥3种胶凝材料组成的不同配合比的地聚物砂浆试件,测试了其温度在80℃时不同养护时间下的强度、自收缩和干燥收缩性能,并研究了其收缩变形规律。试验结果表明:赤泥和粉煤灰基地聚物的矿物活性较低,常温养护的强度较低,收缩变形较大,高温养护能使地聚物砂浆的抗压强度提高2.5~3.0倍;此外,高温养护对抗折强度的提高优于抗压强度,且高温养护能使其收缩变形显著减小约50%;对于活性较大的矿渣地聚物,其常温下就具有较高的抗压强度,养护温度对其强度的提高作用有限;针对不同胶凝材料制作的地聚物试件,需根据矿物材料活性选择合适的养护条件,在提高强度的同时减小收缩变形。In order to study the influence of high-temperature curing on strength and shrinkage performance of geopolymer mortar,several geopolymer mortar test blocks composed of three kinds of cementitious materials,slag,fly ash and red mud,were carried out.Then the strength,autogenous shrinkage and drying shrinkage properties were tested.The test results show that the mineral activity of red-mud-based and fly-ash-based polymers is low,so with the normal temperature curing,the strength is low and the shrinkage is large.High temperature curing can increase the compressive strength by 2.5 to 3.0 times;in addition,the increase in flexural strength of high temperature curing is better than that of compressive strength,and can significantly reduce shrinkage deformation by about 50%.However,the geopolymer mixed with more active slag has higher compressive strength at room temperature,and the strength improvement is limited by changing the curing temperature.For geopolymer test blocks made of different cementitious materials,appropriate curing conditions should be selected according to the activity of mineral materials,which can improve strength and reduce shrinkage deformation.

关 键 词：地聚物 养护 自收缩 干燥收缩 力学强度 

分 类 号：TU526[建筑科学—建筑技术科学]