掺合料对胶凝材料水化热及混凝土氯离子扩散系数的影响  

Influence of mineral admixtures on hydration heat of paste and chloride diffusion coefficient in concrete

作　　者：黎鹏平[1] 苏达根[1] 王胜年 范志宏[1,2] 

机构地区：[1]华南理工大学特种功能材料教育部重点实验室,广东广州510640 [2]水工构筑物耐久性技术交通部重点实验室,广东广州510230

出　　处：《水运工程》2009年第11期6-10,64,共6页Port & Waterway Engineering

基　　金：交通部西部交通建设科技项目(200632800003-11)

摘　　要：分别利用水化热测定仪和自然浸泡法研究了掺合料对胶凝材料水化热及对混凝土内氯离子扩散系数的影响,结果表明:单掺粉煤灰或矿渣时,胶凝材料的放热总量和最大放热速率随掺合料掺量的增加而降低,粉煤灰混凝土内的氯离子扩散系数随粉煤灰掺量的增加先减小后增大,当掺量为30%时氯离子扩散系数最小,矿渣混凝土的扩散系数随矿渣掺量的增加而降低;复掺粉煤灰和矿渣时,复合胶凝材料的放热总量及最大放热速率均低于单掺粉煤灰或矿渣时的胶凝材料,且放热总量随着复合胶凝材料掺量的增加而降低,复合掺合料混凝土内的氯离子扩散系数随掺量的增加而降低,且均低于同比例单掺粉煤灰或矿渣时混凝土内的氯离子扩散系数。The influence of mineral admixture on hydration heat of paste and chloride diffusion coefficient in concrete are investigated by means of the JAF Calorimeter and Natural Immersion Test respectively. The experimental results show that the incorporation of fly ash or slag decreased the total heat evolution and the maximal heat release rate. The chloride diffusion coefficient in fly ash concrete decreased first and then increased with the increase of fly ash content, and it reached the minimum value when the fly ash content was 30%, but it decreased with the increase of slag content in slag concrete. The total heat evolution, the maximal heat release rate in composite cementitious paste which mixed with fly ash and slag, and the chloride diffusion coefficient in the composite cementitious concrete were lower than the cementitious which mixed with fly ash or slag. Furthermore, the total heat evolution and the chloride diffusion coefficient decreased with the increase of composite cementitious content.

关 键 词：矿物掺合料 水化热 氯离子扩散系数 

分 类 号：TU528.041[建筑科学—建筑技术科学]