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文章提出了在环境温度下,小分子聚醚类对水泥水化历程的影响规律及其作用机理。文中采用自行研制的自动高效水化热测定仪及无电极电阻率测试仪,在线测试新拌水泥净浆的水化的热学效应及电阻率变化,并采用排液法进行化学收缩测试。得出结论是,在常温下小分子聚醚类可以降低水泥水化热,延缓结构形成和硬化,从而降低化学收缩,但在高温环境下缓凝作用弱化,降低化学收缩能力下降,因而小分子聚醚类不适宜高温环境下的应用,需重新调整其组分。
The article puts forward the influence law and mechanism of small molecule polyether on the hydration course of cement at ambient temperature. In this paper, a self-developed high-efficiency hydrothermal calorimeter and a non-electrode resistivity tester were used to test the hydration thermal effects and resistivity changes of the fresh cement paste online. The chemical shrinkage test was carried out by using the drainage method. Concluded that at room temperature, small molecular polyether can reduce the cement hydration heat, delay the formation and hardening of the structure, thereby reducing the chemical shrinkage, but under high temperature weakening retardation, reducing chemical shrinkage decreased, and thus small molecules Polyether is not suitable for high temperature applications, the need to re-adjust its components.