凝灰岩机制砂海工混凝土抗氯盐侵蚀耐久性研究  

Experimental Study of Tuff Manufactured Sand on Chloride Resistance of Marine Concrete

作　　者：李遵云 周玉娟[3] 秦明强 孙砚红 

机构地区：[1]中交武汉港湾工程设计研究院有限公司,武汉430040 [2]海工结构新材料及维护加固技术湖北省重点实验室,武汉430040 [3]宁波市高等级公路建设指挥部,宁波315192

出　　处：《硅酸盐通报》2015年第4期955-959,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家科技部科研院所技术开发研究专项资金(2013EG124047);宁波市社会发展重大重点项目(2013C51011);浙江省交通厅科技计划项目(2013H28-2)

摘　　要：对比研究了机制砂中不同凝灰岩粉含量对混凝土氯离子结合能力和临界氯离子浓度两个耐久性关键参数的影响。研究结果表明,掺入一定量的凝灰岩粉后,混凝土的氯离子结合能力有明显改善,氯离子结合总量、化学结合量和物理吸附量均高于基准样。与天然河砂相比,随着机制砂中凝灰岩粉含量的增加,试件中钢筋的临界氯离子浓度虽有一定程度的降低,但钢筋发生锈蚀的时间明显延长,提高了混凝土的使用寿命。The effects of different contents of tuff powder in manufactured sand on the chloride binding capacity and chloride threshold level were investigated respectively. The results indicated that the chloride binding capacity in concrete got significantly improved with a certain amount of tuff powder added. The total amount of chloride binding, chemical binding and physical adsorption were better than control. Although the chloride threshold levels for corrosion were found to decrease with increasing tuff powder content, the time-to-corrosion of steel was delayed and the service life of concrete increased.

关 键 词：凝灰岩机制砂 氯离子结合能力 临界氯离子浓度 混凝土耐久性 

分 类 号：TU528[建筑科学—建筑技术科学]