粉煤灰对水泥基材料溶蚀性能的影响  

INFLUENCE OF FLY ASH ON LEACHING BEHAVIOR OF CEMENT PASTE

作　　者：方正青 汤玉娟[1] 何绍丽 赵海全 FANG Zhengqing;TANG Yujuan;HE Shaoli;ZHAO Haiquan(Department of Civil Engi.,Nanjing Univ.of Science and Technology,Nanjing 210094,China;Yang Jian Group,Jiangsu Yangzhou 225002,China)

机构地区：[1]南京理工大学土木工程系,南京210094 [2]江苏扬建集团有限公司,江苏扬州225002

出　　处：《低温建筑技术》2018年第9期9-13,共5页Low Temperature Architecture Technology

摘　　要：为了在较短时间内获得粉煤灰对溶蚀过程中水泥浆体结构演变及其抗溶蚀能力的影响规律,本文使用6MNH4Cl溶液为加速溶蚀溶液,开展了不同粉煤灰掺量的粉煤灰-水泥复合浆体圆柱试件的加速浸泡溶蚀试验,并利用酚酞滴定法、饱水干燥称重法、X射线衍射分析和扫描电子显微镜等测试方法,测试分析了加速溶蚀过程中粉煤灰及其掺量对水泥基材料的溶蚀深度、平均孔隙率、物相组成和微观形貌等溶蚀参数的影响情况。结果表明,同未掺粉煤灰的水泥浆体相比,虽然粉煤灰的掺入增加了水泥浆体的孔隙率,从而加快了浆体的钙溶蚀进程,但粉煤灰的掺加却降低了浆体中氢氧化钙的含量,减少了溶蚀过程中钙离子的溶出量,从而减缓了水泥浆体的溶蚀劣化程度。In order to obtain quickly the influences fly ash on the structure evolution and leaching resistance of cement-based materials in the process of calcium leaching, 6M NH4Cl solution was used to carry out the accelerate leaching experiments of the fly ash-cement paste slice specimens with different proportion of fly ash. By using the phenolphthalein method, saturation-drying weighing method, X-ray diffraction （XRD） analysis, and Scanning Electron Microscope （SEM/EDS） measurement, the effects of fly ash and its content on the leaching depth average, porosity, phase composition and microstructure morphology of hardened fly ash-cement pastes in the process of accelerate calcium leaching have been discussed. Results show that, compared to cement past, the fly ash-cement paste has a high porosity and a quick calcium leaching resistance. However, the addition of fly ash reduces the content of calcium hydroxide in the cement paste, reduces the leaching of calcium ions in the leaching process and slows down the leaching degree of cement paste.

关 键 词：钙溶蚀 粉煤灰 微结构 孔隙率 XRD 

分 类 号：TU528.01[建筑科学—建筑技术科学]