海砂氯离子与水泥胶体结合的模拟实验与结合机理  

SIMULATION EXPERIMENT AND MECHANISM OF THE COMBINING OF SEA SAND TYPE CHLORINE IONS IN CEMENT MATERIALS

作　　者：刘军[1] 董必钦[1] 邢锋[1] 刘伟[1] 霍元[1] 

机构地区：[1]深圳市土木工程耐久性重点实验室深圳大学土木工程学院,广东深圳518060

出　　处：《硅酸盐学报》2009年第5期862-866,876,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50578095);"十一五"国家科技支撑计划(2006BAJ02B04-01)资助项目

摘　　要：采用一定浓度的NaCl溶液浸泡河砂模拟海砂,研究矿物细掺料对模拟海砂氯离子与水泥胶体结合的影响。结合扫描电镜观察和元素扫描结果,对氯离子在砂子周围的迁移和结合规律进行了描述。结果表明:氯离子的结合率与水泥水化产物有关,砂浆的氯盐浓度对氯离子和水泥的最终结合率影响不大,普通硅酸盐水泥的氯离子稳定后的结合率在60%左右;粉煤灰的掺入降低了水泥结合氯离子的能力,掺量越大,氯离子结合能力下降得越多;偏高岭土对水泥氯离子结合能力的影响不明显;海砂型与内掺型的氯离子扩散、结合方式有所不同,存在从海砂表面到水泥凝胶内部的渗透过程。The influence of mineral admixture on the combining procedure and mechanism of the combining of sea sand type chloride ions and cement material were studied using river sands infused by different concentrations of NaCl-water solution as analogue material. According the results of scarming electron microscopy and energy dispersive spectroscopy analysis, the migration and combination of Cl^- combing at the surface of sand was characterized. The experimental results show that there are significant differences in the combination procedure of inner-mixing chloride ions; sea sand type chloride ions exhibit single-direction penetration from the surface of sea sand to the interior of cement gels. For Portland cement material, the combining ratio of Cl^- will reach about 60%. Whereas, the ratio decreases with the addition of fly ash and takes no much difference with the addition of metakaolin. Based on the experimental results, a model of sea sand type chloride ions corrosion of a concrete structure was developed and the mechanism of chloride ions transfer was investigated by microstructure experimental analysis.

关 键 词：氯离子 海砂 粉煤灰 偏高岭土 结合过程及机理 

分 类 号：TU528[建筑科学—建筑技术科学]