冻融循环次数与风积沙掺量对混凝土氯离子扩散的影响被引量：4

Influence of the Aeolian Sand Content and the Number of Freeze-thaw Cycles on Concrete Chloride Ion Diffusion

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摘要用储量丰富的风积沙部分或全部代替普通河砂制备了风积沙混凝土,采用加速试验并通过化学分析方法测试了在氯盐腐蚀环境下遭受冻融的不同风积沙替代量(0、20%、40%、60%、80%、100%)混凝土的氯离子浓度,计算了风积沙混凝土的氯离子结合能力、氯离子扩散系数,并借助X射线衍射分析(XRD)对试验样品进行物相分析。结果表明,在氯盐环境下遭受冻融的风积沙混凝土自由氯离子浓度随冻融次数增加逐渐增加,氯离子结合表现为Langmuir非线性吸附,并引入结合能力系数k来表征风积沙混凝土的氯离子结合能力;随着冻融次数的增加,不同风积沙掺量混凝土的氯离子扩散系数逐渐减小,75次冻融后混凝土的氯离子扩散系数随风积沙替代量的影响较小,冻融循环次数与风积沙替代量对混凝土氯离子扩散系数的影响存在耦合关系。 Aeolian sand concrete was made by replacing the ordinary river sand partially or totally with abundant aeolian sand. And by the accelerated testing and chemical analysis methods,the chloride ions＇ concentration of the concrete with different aeolian sand content（ 0,20%,40%,60%,80%,100%）was measured when the aeolian san concrete suffered from the freeze-thaw under corrosive environment of the chloride salt. Meanwhile,the combining capacity and diffusion coefficient of the chloride ions in the aeolian sand concrete was also calculated. In addition,the test samples were analyzed by means of X-ray diffraction analysis（ XRD）. The results indicate that the free chloride ions＇ concentration of the aeolian sand concrete suffered from the freeze-thaw under corrosive environment of the chloride salt raises gradually with the increase of the freeze-thaw times. Besides,the combination of chloride ions is characterized by the Langmuir nonlinear adsorption and the combined ability coefficient k is introduced tocharacterize the combining capacity of the chloride ions in the aeolian sand concrete. With the increase of freeze-thaw times,the diffusion coefficient of chloride ions in the concrete with different aeolian sand content is decreasing,while the substitution amount of the aeolian sand has less influence on the diffusion coefficient of chloride ions in the concrete after 75 times of freeze-thaw. Consequently,there is a coupling relationship between the effects of the number of freeze-thaw cycles and the substitution amount of the aeolian sand on the diffusion coefficient of chloride ions in the concrete.

作者吴俊臣申向东郝贠洪

机构地区内蒙古农业大学水利与土木建筑工程学院内蒙古建筑职业技术学院建筑工程学院内蒙古工业大学土木工程学院

出处《硅酸盐通报》 CAS CSCD 北大核心 2017年第11期3784-3790,共7页 Bulletin of the Chinese Ceramic Society

基金国家自然科学基金(51569021 51769025) 教育部创新团队发展计划(IRT13069) 内蒙古自治区高等学校科学研究项目(NJZY17490)

关键词风积沙混凝土盐侵冻融扩散耐久性 aeolian sand concrete salt intrusion freeze-thaw diffusion durability

分类号 TU528 [建筑科学—建筑技术科学]