摘要
内河环境下,由于混凝土碳化所导致的内部钢筋锈蚀是引起港口码头结构发生耐久性失效破坏的主要原因。为研究内河库水位周期性变动下码头桩基混凝土的碳化规律,开展一般大气环境与干湿交替环境下混凝土的加速碳化物理试验。结果表明:1)混凝土碳化深度随碳化时间的增加而逐渐增加,碳化速率随碳化龄期增长而减缓。2)与一般大气环境相比,干湿交替作用下混凝土的碳化深度更小。基于Fick第一定律的碳化深度模型,通过拟合回归并修正后建立了内河一般大气环境和干湿交替环境下码头桩基混凝土碳化深度预测模型。经对比,模型预测值与试验实测值吻合程度良好,验证了该模型的精度。研究成果可为内河港口码头基础结构运营维护及耐久性评估提供技术支撑。
Under an inland river environment, the corrosion of internal steel bars due to concrete carbonization is the primary cause for the durability failure of the port structure. To study the carbonation law of wharf pile foundation concrete under the effect of periodic fluctuation of water level in the inland reservoir,the accelerated carbonation test of concrete in general atmospheric environment and alternate dry-wet environment was carried out. Test results indicate that: 1) The carbonization depth of concrete gradually increases with the increase of the carbonization time,and the carbonization rate slows down as the carbonization age increases. 2) Compared with the atmospheric environment,carbonation depth of concrete under the alternating action of a dry-wet cycle is smaller. Based on the carbonation depth model derived from Fick’ s first law,through fitting and correction,a prediction model of concrete carbonation depth under an inland service environment is established and verified.Results show good consistency between the proposed model values and the tested values,which verifies the accuracy of the model. The research achievement can provide technical support for the operation,maintenance,and durability evaluation of the inland port terminal infrastructure.
作者
刘明维
郭庆
刘耕
吴林键
王高林
LIU Ming-wei;GUO Qing;LIU Geng;WU Lin-jian;WANG Gao-lin(National Inland Waterway Improvement Engineering Research Center,Chongqing Jiaotong University,Chongqing 400074,China;Key Laboratory for Hydraulic&Waterway Engineering of Ministry of Education,Chongqing Jiaotong University,Chongqing 400074,China;Sichuan Provincial Transportation Department Traffic Investigation&Design Institute,Chengdu 610017,China)
出处
《水运工程》
北大核心
2021年第4期49-55,共7页
Port & Waterway Engineering
基金
四川省交通运输科技项目(2018-B-04)
重庆市社会民生科技创新专项项目(cstc2017shmsA30002)
重庆市自然科学基金博士后科学基金项目(cstc2019jcyj-bshX0063)
中国博士后科学基金面上资助项目(2019M653824XB)。
关键词
混凝土碳化
干湿交替
碳化深度
预测模型
concrete carbonization
dry-wet cycling
carbonation depth
prediction model
