粉煤灰基地聚物再生混凝土的力学性能和微观结构  

Mechanical Properties and Microstructure of Fly Ash Based Geopolymeric Polymer Recycled Concrete

作　　者：龙涛[1] 石宵爽[1] 王清远[1] 李浪[1] 

机构地区：[1]四川大学能源工程安全与灾害力学教育部重点实验室建筑与环境学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2013年第S1期43-47,共5页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家杰出青年基金资助项目(10925211);教育部创新团队计划资助项目(IRT1027)

摘　　要：试验利用再生粗骨料替代天然粗骨料,设计6组不同再生骨料取代率(0%、50%和100%)的碱激发粉煤灰基地聚物再生混凝土和普通再生混凝土的配比方案,测试了其密度、弹性模量、泊松比和抗压强度,对比分析了地聚物再生混凝土与普通再生混凝土的基本力学性能差异以及不同取代率对其力学性能的影响。并进一步通过扫描电镜对微观结构的观察,解释分析了试验中不同混凝土力学性能和破坏机制。试验结果表明,在不同的龄期,地聚物再生混凝土比再生混凝土具有更高的强度。随着再生骨料含量的增高,抗压强度、弹性模量和泊松比都逐渐降低。反应原理和生成产物的不同使得地聚物混凝土的基体和界面过渡区更加密实,是其获得较高强度的主要原因。Six mixtures were designed according to the alkali-activated low calcium fly ash concrete using recycled aggregates(RA) to substitute nature coarse aggregates with different ratios(0%,50% and 100%).The compressive strength,elastic modulus and Poisson's ratio of such geopolymer recycled concrete(GRC) were investigated and compared with various RA replacement ratios.The mechanical properties and failure mechanism of recycled aggregate concrete(RAC) and GRC were tested and discussed by scanning electron microscopy(SEM) analysis.The results showed that GRC concretes are stronger than RAC concretes at different ages.The compressive strength,elastic modulus and Poisson's ratio decrease with the increase of RAs content.The paste and interfacial transition zones(ITZs) are denser in GRC due to different matrix formation process and reaction products,which is the reason for the higher compressive strength of GRC.

关 键 词：地质聚合物 粉煤灰 再生骨料 抗压强度 微观结构 界面过渡区 

分 类 号：TU528.41[建筑科学—建筑技术科学]