| 摘要: |
| 基于新疆若羌盐渍土环境，对水胶比为0.32、0.35和0.38的混凝土试件，进行硫酸盐溶液浸泡腐蚀（标准养护28 d）、盐渍土腐蚀（标准养护28 d）、盐渍土腐蚀（标准养护3 d）这3种腐蚀制度下的耐久性试验，分析腐蚀制度与水胶比交互作用下混凝土动弹性模量经时演变规律与作用机制.并基于混凝土动弹性模量动态变化过程，通过Wiener过程理论，建立了盐渍土环境下混凝土服役寿命预测模型，以定量表征混凝土损伤劣化规律.结果表明：在各腐蚀制度下，随腐蚀龄期增加，混凝土损伤度均出现先减小后增大的规律；在腐蚀终期，混凝土水胶比与其损伤度呈负相关；在相同水胶比下，硫酸盐溶液浸泡腐蚀（标准养护28 d）、盐渍土腐蚀（标准养护28 d）、盐渍土腐蚀（标准养护3 d）对混凝土损伤程度的影响依次增加；由Wiener过程理论建立的混凝土服役寿命预测模型可知，混凝土预测寿命退化呈3阶段变化趋势，其趋势与试验中混凝土劣化过程保持一致. |
| 关键词: 混凝土 西北盐渍土 动弹性模量 Wiener过程理论 寿命预测 |
| DOI：10.3969/j.issn.1007-9629.2023.11.007 |
| 分类号:TU528.4 |
| 基金项目:国家自然科学基金资助项目（52068042）；中国国家铁路集团有限公司科技研究开发计划项目（K2021G025）；甘肃省杰出青年科学基金资助项目（21JR7RA344） |
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| Damage Evolution and Life Prediction of Concrete in Saline Soil Based on Wiener Process Theory |
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ZHANG Xuepeng1, ZHANG Rongling1,2, WANG Xiaoping1, HU Ruipeng3, SONG Yi1
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1.College of Civil Engineering， Lanzhou Jiaotong University， Lanzhou 730070， China;2.Bridge Engineering National Local Joint Engineering Laboratory of Disaster Prevention and Control Technology， Lanzhou Jiaotong University， Lanzhou 730070， China;3.China Railway Xi’an Survey and Design Research Institute Co.， Ltd.， Xi’an 710054， China
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| Abstract: |
| Based on the saline soil environment in Ruoqiang， Xinjiang， durability tests were conducted on concrete specimens with water cement ratios of 0.32， 0.35 and 0.38 under three erosion regimes， namely， sulphate solution immersion corrosion （standard curing for 28 d）， saline soil corrosion （standard curing for 28 d）， saline soil corrosion （standard curing for 3 d）. The evolution of the dynamic elastic modulus of concrete under the interaction of the erosion regimes and water cement ratios over time was analyzed. Based on the dynamic change process of concrete dynamic elastic modulus， a service life prediction model of concrete in saline soil environment was established base on Wiener process theory to quantitatively characterize the damage deterioration law of concrete. The results show that： under each erosion regime， with the increase of erosion age， the damage degree of concrete is first reduced and then increased； in the final erosion period， the water cement ratio of concrete is negatively correlated with its damage degree； under the same water cement ratio， the effects of sulfate solution immersion corrosion （standard curing 28 d）， saline soil corrosion （standard curing 28 d）， saline soil corrosion （standard curing 3 d） on the degree of damage to the concrete are successively increased； by Wiener process theory， a model is established to predict the service life of concrete in the saline soil environment， to quantitatively characterize the damage deterioration law. It can be seen that the predicted life degradation of concrete is a 3-stage trend， and its trend is consistent with the deterioration process of concrete in the test. |
| Key words: concrete northwest salty soil dynamic elastic modulus Wiener process theory life prediction |
