[1]陈 帅,左晓宝,殷光吉.软水环境下粉煤灰对水泥净浆溶蚀特性的影响[J].南京理工大学学报(自然科学版),2020,44(02):252-258.[doi:10.14177/j.cnki.32-1397n.2020.44.02.018]
 Chen Shuai,Zuo Xiaobao,Yin Guangji.Influence of fly ash on leaching behavior of cement paste under environment of soft water[J].Journal of Nanjing University of Science and Technology,2020,44(02):252-258.[doi:10.14177/j.cnki.32-1397n.2020.44.02.018]
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软水环境下粉煤灰对水泥净浆溶蚀特性的影响
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《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

卷:
44卷
期数:
2020年02期
页码:
252-258
栏目:
出版日期:
2020-04-30

文章信息/Info

Title:
Influence of fly ash on leaching behavior of cement paste under environment of soft water
文章编号:
1005-9830(2020)02-0252-07
作者:
陈 帅左晓宝殷光吉
南京理工大学 理学院,江苏 南京 210094
Author(s):
Chen ShuaiZuo XiaobaoYin Guangji
School of Science,Nanjing University of Science and Technology,Nanjing 210094,China
关键词:
软水环境 粉煤灰 水泥净浆 钙溶蚀 微观形貌
Keywords:
emironment of soft water fly ash cement paste calcium leaching microstructure morphology
分类号:
TU528.01
DOI:
10.14177/j.cnki.32-1397n.2020.44.02.018
摘要:
为了研究软水环境下掺入粉煤灰对水泥净浆溶蚀特性的影响,该文制备了不同粉煤灰掺量的水泥净浆薄片,进行去离子水中薄片试件浸泡溶蚀实验。通过饱水-干燥称重法、乙二胺四乙酸(EDTA)滴定法、扫描电子显微镜(SEM/EDS)等测试,分析了各试件孔隙率、钙溶出量、钙硅比和微观形貌等随粉煤灰掺量和溶蚀时间的变化规律。结果表明,掺入粉煤灰可增加水泥净浆的初始孔隙率,且试件的溶蚀深度随着粉煤灰掺量的增加而增大,进而导致薄片试件溶蚀进程加快; 但掺入粉煤灰可降低水泥浆体中氢氧化钙含量及钙溶出量和溶出速度,且其火山灰反应所生成的致密水化硅酸钙(C-S-H)凝胶可有效填充浆体孔隙,延缓溶蚀过程中试件的孔隙率增长和密实度下降,使薄片试件的溶蚀程度降低。
Abstract:
In order to investigate influence of fly ash on leaching behavior of cement paste in soft water,the cement paste slice specimens with different fly ash content are prepared to perform their leaching experiments in deionized water. By using the saturation-drying weighing method,the ethylene diamine tetraacetic acid(EDTA)titration,and the scanning electron microscope(SEM/EDS)measurement,the changes of porosity,calcium dissolution,Ca-Si ratio and microstructure morphology in the specimens with fly ash content and leaching time are analyzed. Results show that,the addition of fly ash can increase the initial porosity and leaching depth of the slice specimens,and accelerate leaching process of cement pastes.However,the fly ash can also reduce the content of calcium hydroxide and calcium dissolution in the cement paste,and the dense C-S-H gel formed by the pozzolanic reaction can effectively fill the pores in cementpaste resulting in slowing down the increase of porosity and the decrease of compactness in the specimens in its leaching process,so the fly ash can reduce the leaching degree of cement pastes.

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备注/Memo

备注/Memo:
收稿日期:2019-01-20 修回日期:2019-11-27
基金项目:国家自然科学基金(51778297)
作者简介:陈帅(1996-),男,硕士生,主要研究方向:混凝土材料与结构,E-mail:15861815714@163.com; 通讯作者:左晓宝(1968-),男,教授,博士生导师,主要研究方向:混凝土材料与结构、防灾工程,E-mail:xbzuo@sina.com。
引文格式:陈帅,左晓宝,殷光吉. 软水环境下粉煤灰对水泥净浆溶蚀特性的影响[J]. 南京理工大学学报,2020,44(2):252-258.
投稿网址:http://zrxuebao.njust.edu.cn
更新日期/Last Update: 2020-04-20