摘要
采用压汞试验,扫描电镜(Scanning electron microscope,SEM)及X射线衍射仪(X-ray diffractometer,XRD)对3种密度的泡沫混凝土的微观结构及水化产物进行研究。通过压汞试验及SEM得到泡沫混凝土的孔隙率,孔径分布及内部微观形貌。结果表明泡沫混凝土的孔隙率,最可几孔径及临界孔径均随密度的增大而减小,气孔间基质随密度的增大而趋于紧密,结晶更完整,气孔的初始缺陷及损伤减少。通过XRD试验分析泡沫混凝土不同龄期的水化产物,得到分析图谱。结果表明不同龄期的水化产物大致相同,随着龄期的增长,泡沫混凝土水化过程中不断生成钙矾石晶体,结晶程度逐渐提高。
The microstructure and hydration products of foamed concrete of three densities are studied by means of mercury injection test,scanning electron microscope(SEM)and X-ray diffractometer(XRD).The porosity,pore size distribution and internal microstructure of foamed concrete are obtained by mercury injection test and SEM.The results show that the porosity,the most probable pore diameter and critical pore size of foamed concrete decrease with the increase of density.The matrix between pores tends to be compact with the increase of density,the crystallization is more complete,and the initial defect and damage in pores are reduced.The hydration products of foamed concrete at different ages are analyzed by XRD test.The results show that the hydration products at different ages are approximately the same.With the growth of curing age,ettringite crystals are continuously generated during the hydration process of foamed concrete,and the degree of crystallization gradually increase.
作者
冯璐
宁英杰
陈徐东
王新泉
刁红国
石丹丹
温荣鲲
FENG Lu;NING Yingjie;CHEN Xudong;WANG Xinquan;DIAO Hongguo;SHI Dandan;WEN Rongkun(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;Zhejiang Communications Construction Group Co.,Ltd.,Hangzhou 310051,China;Key Laboratory of C&PC Structures,Ministry of Education,Southeast University,Nanjing 210096,China;School of Engineering,Zhejiang University City College,Hangzhou 310015,China)
出处
《混凝土》
CAS
北大核心
2022年第7期1-5,共5页
Concrete
基金
国家自然科学基金(51979090
51678219)
江苏省自然科学优秀青年基金(BK20190075)
中国科协青年人才托举项目(2017QNRC001)
中央高校基本科研业务费专项资金(B200202076)。
关键词
泡沫混凝土
压汞试验
扫描电镜
微观结构
水化产物
foamed concrete
mercury injection test
scanning electron microscope
microstructure
hydration products
作者简介
第一作者:冯璐(1998-),女,硕士研究生,主要从事混凝土动态力学特性研究。联系地址:江苏省南京市鼓楼区西康路1号河海大学土木与交通学院(210098)联系电话:18262622783;通讯作者:王新泉(1981-),男,教授,博士,主要从事软土地基处理研究。联系电话:13757158022。
