Water Permeability and Chloride Ion Diffusion of Phosphoaluminate Cement Concrete
Water permeability and diffusion of chloride ion in concrete can lead to the corrosion of steel bar and destroy concrete structures. Phosphoaluminate cement (PAC) was a new kind of cementitious material which had many special properties compared to Portland cement. In the study, chloride ion diffusion in PAC concrete was tested with RCM method. The phase composition and morphology of hydration products and electrical properties of PAC cured 28 days were analyzed with x-ray diffraction (XRD) and electrochemical impedance spectroscopy (EIS). The results showed that water permeability and chloride ion diffusion coefficients of PAC were much lower than PC under the same test conditions. The corresponding water permeability and chloride ion diffusion coefficient of PAC cured 28days was 2.98×10-12 mm/s, 1.37×10-12m2/s. That was because the hydration mechanism and the hydrates of PAC differed from PC. The hydration products of PAC were main micro-crystalline phase and gel of phosphate and phophoaluminate which formed a compact microstructure. In the PAC hardened paste, chloride ions might replace the atom group OH-and PO43-of hydration products and become stable compounds.
Yu Zhiwu Liu Peng Chen Lingkun Ding Zhu Zhang Xiaoqiang
School of Civil Engineering and Architecture, Central South University, Changsha, 410075 China College of Civil Engineering, Shenzhen University, Shenzhen, 518060 China Shan Dong Chemical Planning and Design Institute, Shan Dong, Jinan, 250013 China
国际会议
桂林
英文
1-6
2010-11-16（万方平台首次上网日期，不代表论文的发表时间）