Study of performance deterioration of concrete used for estuarine environment
In the current paper, the performance deterioration of F30S30 concrete used for Chongqi Bridge caps in 3.5％ sodium chloride solution, 5.0％ sodium sulfate solution, 3.5％NaCl+5％Na2SO4 composite solution, and 2.0％NaCl+ 0.35％MgCl2+0.25％Na2SO4 simulated seawater solution are studied. X-ray diffraction ( XRD ) , scanning electron microscopy (SEM), and x-ray computed tomography (X-CT) analysis were applied to characterize the changes in structure and morphology. According to the results, the change in pore structure obtained through the X-CT can reflect the amount of corrosion products and degree of destruction. The variety and quantity of corrosion products varied with the corrosive environment. The damage mechanisms of concrete also changed according to corrosive environment. For the simulated seawater environment, the effects of Mg2+ and SO42- were superimposed upon each other, thereby posing a serious threat to the structure, mainly in form of damage and coarsening of the pore structure caused by Mg2+.
wet-diy cycles pore structure simulated seawater environment performance deterioration
LIU Guanguo MA Aibin ZHANG Xiongwen PANG Chaoming QIN Honggen WANG Lun
College of Mechanics and Materials, Hohai University, Nanjing 210098, PR China Jiangsu Transportati College of Mechanics and Materials, Hohai University, Nanjing 210098, PR China Jiangsu Transportation Research Institute Co., Ltd., Nanjing 211112, PR China Key Laboratory of Larg School of Materials Science and Engineering, Jiangsu Key Laboratory of Civil Engineering Material, S Key Laboratory of Large-span Bridge Health Inspection & Diagnosis Technology Ministry of Communicati
国际会议
三峡
英文
1079-1082
2012-05-18（万方平台首次上网日期，不代表论文的发表时间）