关键词: 水泥石;高温;水冷却;循环;碳化

Abstract: 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 CaCO3left in damage samples.

Key words: cement paste;high temperature;water cooling;circulation;carbonization