弯曲荷载作用下水位变动区域混凝土中氯离子扩散规律试验  

Test of Chloride Diffusion Rules in Concrete at Tidal Zone Under Flexural Load

作　　者：赵尚传[1] 贡金鑫[2] 水金锋[2] 

机构地区：[1]交通部公路科学研究院,北京100088 [2]大连理工大学土木水利学院,辽宁大连116023

出　　处：《中国公路学报》2007年第4期76-82,共7页China Journal of Highway and Transport

基　　金：国家西部交通建设科技项目(200631822302);山东省交通厅科技项目(2004y007)

摘　　要：为了明确氯离子在水位变动区域混凝土中的扩散特性,研究了干湿交替条件和弯曲荷载共同作用下氯离子在混凝土中的扩散规律。试验过程中考虑3个试验因素:混凝土强度等级、弯曲荷载水平、应力性质。试验结果表明:随着混凝土强度等级的提高,氯离子扩散性能降低;随着荷载水平的提高,受拉区混凝土抗氯离子侵蚀的能力降低,受压区混凝土抗氯离子侵蚀的能力有所提高;受拉区混凝土抗氯离子侵蚀能力明显低于受压区;无论承受受压荷载还是受拉荷载,随着时间的延长,氯离子在混凝土中的扩散系数均逐渐降低。In order to know chloride diffusion characteristics well in concrete at tidal zone, chloride diffusion rules in concrete were studied under the effect of dry and wet alternation and flexural load. Three factors were concerned, ie concrete strength degree, flexural load level and stress nature. The test results show that chloride diffusion property decreases with increase of concrete strength; resistance capability to chloride ingress decreases with increase of load level in tensile stress region and increases with increase of load level in compressive stress region; concrete resistance to chloride ingress in tensile region is notable lower than that in compressive region; chloride diffusion coefficient in concrete decreases with increase of time no matter in compressive region or in tensile region.

关 键 词：桥梁工程 混凝土 试验研究 氯离子扩散 弯曲荷载 水位变动区域 

分 类 号：U443[建筑科学—桥梁与隧道工程]