高温-水冷循环作用下的水泥石劣化分析  

Deterioration Analysis of Cement Paste under Heat-Water Circulation

作　　者：束伟 钱文勋 陈迅捷[1,2] 

机构地区：[1]南京水利科学研究院,南京210029 [2]水利部水工新材料工程技术研究中心,南京210029

出　　处：《硅酸盐通报》2018年第1期80-85,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51479125);国家重点研发计划(2016YFC0401610)

摘　　要：通过失重率与表层损伤评价高温-水冷循环作用对水泥石的劣化方式,利用X射线衍射(XRD)、热分析技术(TG/DTA)对不同循环条件下的水泥石进行物相组成分析。结果表明:高温-水冷循环作用实质是高温损伤、水化以及碳化的耦合作用,水泥石中氢氧化钙(CH)碳化严重,水化硅酸钙(C-S-H)大多脱水分解;不同温度下的循环破坏中,各个作用所占的比重不同;随着循环次数增加,水泥石的破坏历程相近;长时间后,水泥石的脆硬性大大增加,表层出现网状裂纹,破坏样中留有大量碳酸钙(CaCO_3)。The deterioration mode of heat-water circulation was evaluated by weightlessness rate and surface damage,cement paste composition of different circulation condition was analyzed by using X-ray diffraction（XRD） and thermoanalysis technology（TG/DTA）.Results show that the heat-water circulation effect is high temperature damage,hydration and carbonization coupling effect in essence,calcium silicate（C-S-H） is mostly dehydrated,and calcium hydroxide（CH） is carbonized in cement paste.Different temperatures circulation effect,different proportion of each role.As the cycle number increases,the damage course of cement paste is similar.After a long time,brittleness and hardness of cement paste are greatly increased,meanwhile,multiple cracks formed as net are appeared on the surface,and a lot of CaCO_3 left in damage samples.

关 键 词：水泥石 高温 水冷却 循环 碳化 

分 类 号：TU528.01[建筑科学—建筑技术科学]