混凝土抗硫酸盐侵蚀性能及其离子扩散影响因素研究-中国材料进展

文章信息/Info

Title:: Study on the Sulfate Resistance of Concrete and the Influencing Factors of Ion Diffusion

作者:: 肖鹏震1; 张戎令1; 2; 胡锐鹏3; 石小清4; 窦晓峥1; 熊泽宇1; （1. 兰州交通大学土木工程学院，甘肃兰州 730070）（2. 兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室，甘肃兰州 730070）（3. 中铁西安勘察设计研究院有限责任公司，陕西西安 710054）（4. 中铁21局集团有限公司，甘肃兰州 730070)

Author(s):: XIAO Pengzhen1; ZHANG Rongling1; 2; HU Ruipeng3; SHI Xiaoqing4; DOU Xiaozheng1; XIONG Zeyu1; (1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China) （2. National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control, Lanzhou Jiaotong University, Lanzhou 730070, China）（3. Xi’an Railway Survey and Design Institute Co., Ltd., Xi’an 710054, China）（4. China Railway 21st Bureau Group Co., Ltd., Lanzhou 730070, China)

摘要:: 为了进一步解释混凝土受硫酸盐侵蚀劣化机理，研究了不同水胶比以及养护时间对全浸泡下混凝土抗硫酸盐侵蚀性能的影响，分析了硫酸盐在混凝土中的扩散过程。试验制备了0.32、0.35、0.38这3种水胶比的普通硅酸盐水泥混凝土试件，对其质量、动弹性模量、抗压强度、SO42-浓度等指标进行分析。结果表明：全浸泡条件下，混凝土抗硫酸盐侵蚀性能随着水胶比的降低而提高；养护28 d的混凝土抗硫酸盐侵蚀能力大于养护3 d的混凝土，养护时间越短，水化过程越不完全，混凝土劣化速度越快；混凝土中SO42-浓度随着水胶比的降低而降低，随着养护时间的减小而增大。

Abstract:: In order to further explain the mechanism of concrete deterioration by sulfate erosion, the resistance to sulfate erosion of concretes samples with different water-cement ratio and curing time under full immersion conditions and sulfate solution diffusion in concrete were studied. Cement concrete samples with water-cement ratio of 0.32, 0.35 and 0.38 were prepared. The evaluating indicators such as the mass, dynamic elastic modulus, compressive strength and sulfate ion content were analyzed. The results show that，under the condition of Na2SO4 solution full immersion, the resistance to sulfate attack increases with the decrease of water-cement ratio; the sulfate resistance of concrete cured for 28 days is greater than that of concrete cured for 3 days, the shorter the curing time is, the less complete the hydration process is, and the faster the deterioration rate of concrete is; the sulfate ion concentration in concrete decreases with the decrease of water-binder ratio and increases with the decrease of curing time.