粉煤灰基地聚物混凝土的碳化性能研究  

Research on Carbonation of Fly Ash Geopolymeric Concrete

作　　者：黄琪[1] 石宵爽[1] 王清远[1] 唐灵[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,成都610065

出　　处：《中国农村水利水电》2015年第7期121-125,130,共6页China Rural Water and Hydropower

基　　金：四川省科技计划项目(2015JPT0001)

摘　　要：试验分别设计了碱激发粉煤灰基地聚物混凝土和普通混凝土的配合比方案。依据《普通混凝土长期性能和耐久性能试验方法标准》(GB/T 50082-2009)中的碳化试验方法,使用浓度为1%酚酞酒精溶液分别测试了试件在碳化3d、7d、14d和28d时的碳化深度。测试和对比了两种混凝土在不同碳化时间的抗压强度的变化。同时,通过对试件的研磨处理,进一步测试了试件表面pH值的变化。并通过扫描电子显微镜(SEM)观察了混凝土碳化反应前后微观结构的变化,利用能量色散X射线光谱仪(EDX)分析测定了碳化前后元素的相对含量。研究结果表明,相比普通混凝土,粉煤灰基地聚物混凝土受碳化影响后期抗压强度变化不大,pH值变化较缓和,碳化前后元素相对含量差别不大,微观结构更均匀密实,因此其抗碳化性能更佳。Two mixtures were designed to manufacture ordinary Portland cement concrete （PCC） and alka-li-activated fly ash geopolymeric concrete （FGC） .According to the carbonization test method in“Ordinary Concrete Long-term Performance and Dura‐bility Test Method Standard”（GB/T 50082-2009） ,1% phenolphthalein solution was used to measure the depth of carbonation at 3rd ,7th ,14th and 28th day .The changes of compressive strength of the specimens carbonized with different days were tested and compared ,as well as the pH of specimens＆#39;surfaces .Furthermore ,the changes in micro-structure and chemical composition were ob‐served through the scanning electronic microscope （SEM ） and energy dispersive X-ray spectrometer （EDX） ,respectively .The re‐sults show that there was no obvious effect of carbonization on compressive strength ,pH and chemical composition of FGC .Howev‐er ,the microstructure of FGC is more homogeneous and denser .It can be concluded that compared with PCC ,resistance to carboni‐zation of FGC is much better .

关 键 词：地质聚合物 碳化 抗压强度 元素相对含量 扫描电子显微镜 

分 类 号：TU528.41[建筑科学—建筑技术科学]