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因高性能混凝土的抗火性与高温下硬化水泥浆(HCP)的化学分解有密切关系,为获得对火灾高温所致HCP化学分解特征的定量理解,对HCP试样进行了400~800℃的高温处理,采用XRD测定C-S-H化学分解动力学.结果表明,C-S-H分解始于560℃,但仅在600℃以上其分解才变得显著,且分解速度随温度升高而急剧增大.尽管C-S-H的分解可造成混凝土强度的显著下降,但这种分解主要发生在600℃以上温度范围内,故对更低温度下发生的高温爆裂基本没有影响.分别建立了在600、700和800℃温度下C-S-H分解反应动力学方程.
Because of the close relationship between the fire resistance of high-performance concrete and the chemical decomposition of high-temperature hardened cement (HCP), in order to obtain a quantitative understanding of the chemical decomposition characteristics of HCP caused by high temperature in fire, The results showed that the decomposition of CSH began at 560 ℃, but its decomposition became significant only at 600 ℃ and the decomposition rate increased sharply with the increase of temperature.While CSH Decomposition can cause a significant decline in concrete strength, but this decomposition occurs mainly in the temperature range above 600 ℃, so the high temperature burst occurred at a lower temperature has almost no effect were established at 600,700 and 800 ℃ temperature CSH Decomposition reaction kinetics equation.