摘要
借助X衍射分析(XRD)及综合热分析(TG-DTA)技术,研究了水泥石在高温(300~600℃)水冷后的物相组成变化。结果表明:高温后,不同条件下的水泥石除不同程度的脱水分解外,均出现了二次水化及严重碳化,其碳化程度由低到高为:自然冷却、水冷却、水冷后静置;破坏样中Ca(OH)_2和CaCO_3质量分数受Ca(OH)_2分解温度范围影响显著。
Scholars have given wide attention on cooling methods to heat degradation mechanism of concrete, but the physical and chemical changes in the process of water cooling and standing is not clear. The phase and composition of hardened cement paste at high temperature （300-600℃） after water.cooling under different conditions were analyzed by using X-ray diffraction （XRD） and thermoanalysis technology （TG-DTA）. The results show that, after the high temperature, different hardened cement paste under the condition has the different levels of decomposition of dehydration, secondary hydration and severe carbonization, and the degree of carbonization from low to high as follows： natural cooling, water cooling, standing after water; the mass fraction of Ca（OH）2and CaC03 in the destructive sample have remarkable effect by Ca （OH）2 decomposition temperature range.
出处
《混凝土与水泥制品》
北大核心
2018年第2期17-21,共5页
China Concrete and Cement Products
基金
中央公益性科研院所基本科研业务费专项资金(Y416013
Y416018)
江苏省水利科技项目(2015013)
关键词
水泥石
高温
水冷却
静置
碳化
混凝土
裂缝
x衍射分析
热分析
Hardened cement paste
High temperature
Water cooling
Standing
Carbonization
Concrete
Crack
X-raydiffraction （XRD）
Thermoanalysis technology （TG-DTA）
