Elevated Temperature Properties of Bamboo Shaving Reinforced Geopolymer Composites  

作　　者：Xinli Zhang Jiayu Zhang Zuhua Zhang Yiqiang Wu Yingfeng Zuo 

机构地区：[1]College of Materials Science and Engineering,Central South University of Forestry and Technology,Changsha,410004,China [2]College of Civil Engineering,Hunan University,Changsha,410082,China

出　　处：《Journal of Renewable Materials》2023年第1期27-40,共14页可再生材料杂志（英文）

基　　金：supported by the Excellent Youth Foundation of Education Department of Hunan Province,China(20B612);Changsha Natural Science Foundation of China(kq2014158).

摘　　要：Geopolymer is a new alternative cement binder to produce concrete.In the present study,a novel geopolymer composites containing bamboo shaving(0–2 wt.%)were fabricated and exposed to the temperatures of 200℃,400℃,600℃and 800℃.Physical properties,micro-structure,and mechanical strengths of the geopolymer composites were evaluated before and after heating in order to understand their thermal properties,which are essential for the use as building materials.As the temperature rises,the drying shrinkage and apparent porosity of the composites increase,while the compressive and bending strengths decrease.At the temperature range of 200℃–800℃,the residual compressive strength rates of the geopolymer composite containning 2 wt.%bamboo shaving were respective 73.8%,61.47%,56.16%,and 29.56%,meanwhile,the residual flexural strength rates were respective 46.69%,8.68%,2.52%,and 2.33%.Correspondingly,the residual compressive strength rates of pure geopolymer were respective 72.81%,61.99%,54.55%,and 14.64%;the residual flexural strength rates were 48.87%,5.69%,3.22%,and 2.47%,respectively.Scanning electron microscope(SEM),optical microscope,and X-ray diffractometry(XRD)were applied to find the microscopic changes.The strength loss in the geopolymer composites was mainly because of the thermal degradation of bamboo shaving and shrinkage of geopolymer matrix.Bamboo shaving has great potential as reinforcer in developing low-cost geopolymer composites and may be used for applications up to 400℃.

关 键 词：Geopolymer composites bamboo shaving mechanical properties high temperature microstructure 

分 类 号：TB33[一般工业技术—材料科学与工程]