Changes of pore structures in hardened cement paste subjected to flexural loading and wet-dry cycles in seawater
The coupling effect of flexural loading and environmental factors has great influence on the pore structures in hardened cement paste. In this paper, Mercury intrusion porosimetry (MIP) and field emission scanning electron microscope (SEM) were used to analyze and observe the changes of pore structures in hardened cement paste subjected to flexural loading and wet-dry cycles in simulated seawater. The results show that the porosity greatly increases when the flexural loading level is raised from 0 f(the ultimate flexural loading capacity) to 0.8/ Microcracks are observed and the connectivity, width and density of micro-cracks increase with the increment of flexural loading. The peaks position of pore size shifts toward greater micro-pores when the flexural loading was raised from 0fto 0.8/ The flexural loading and simulated seawater accelerate the degradation of pore structures.
cement pore structures flexural loading wet-dry cycles seawater
Wuman Zhang Wei Sun Jinyang Jiang
School of Transportation Science and Engineering, Beihang University, Beijing, 100191, China Jianggu key laboratory of construction materials, Southeast University, Nanjing, 211189, China
国际会议
西安
英文
743-746
2011-09-22（万方平台首次上网日期，不代表论文的发表时间）