弯拉荷载和碳化耦合作用下氯离子扩散试验研究  

Experimental Study on Chloride Diffusion under the Effect of Flexural Tensile Load and Carbonization Coupling

作　　者：程阳[1] 孙家瑛[1,2] 郑明[3] 

机构地区：[1]上海大学土木工程系,上海200070 [2]浙江大学宁波理工学院,宁波315100 [3]浙江大学建筑工程学院,杭州310058

出　　处：《硅酸盐通报》2017年第5期1700-1705,1712,共7页Bulletin of the Chinese Ceramic Society

基　　金："十二五"国家科技支撑项目(2015BAL02B03);浙江省自然科学基金项目(Y13E080050)

摘　　要：为了解决盐雾区弯拉荷载和碳化耦合作用下氯离子在混凝土中的传输问题,设计了荷载对氯离子、碳化对氯离子扩散影响的试验,由于荷载作用会对碳化有所影响,进而再次影响氯离子的扩散作用,因此设计了荷载对碳化深度影响的试验。以Fick第二定律为基准模型,通过对以上三个实验数据的整理并结合已有的研究成果逐步建立了荷载碳化耦合作用下对氯离子扩散的影响关系,该模型对盐雾区受拉构件使用寿命的估算具有一定的指导意义。通过理论公式的计算结果与实验数据进行对比,误差低于5%,从而进一步说明了这样分步建立模型方法的正确性。In order to solve the transmit problem of chloride ion in concrete under the composite effect of flexural tensile load and carbonization in the salt fog area, experiments were designed to study the impact of flexural tensile load and carbonization on the chloride diffusion,respectively. Moreover, since flexural tensile load can influence the carbonization process, which further impacts the chloride ion diffusion, the experiment of load＇s impact on the carbonation depth was also designed for the research. With Fiek＇s Second Law as the benchmark model, a new model of chloride ion diffusion under the composite effect of flexural tensile load and carbonization has been constructed based on the above experiment data as well as existing studies. This model have some positive sense when to predict the flexural member service life in the salt fog area. Experiment outcomes are in line with the results calculated based on the theoretical model with a minor error of under 5% , which further illustrates the validity of step-by-step model construction.

关 键 词：弯拉荷载 碳化深度 耦合作用 氯离子扩散系数 寿命预测 

分 类 号：TU528[建筑科学—建筑技术科学]