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用冻结法掘井时适于用加防冻剂的混凝土浇灌井壁,这种防冻剂可使混凝土在-15～-17℃温度下,经28天养护抗压强度达到25～30兆帕。利用加防冻剂的混凝土浇灌井口井壁时,由于经受正、负温度的交替作用,必须保证混凝土有很高的抗冻性。用化学添加剂形成水泥块的定向结构,是保证提高混凝土使用期的很有发展前途的工艺过程。用混凝土添加剂作防冻剂即可改变混凝土的孔隙率,也可改变水泥的水化相结构。在水泥的水化过程中,形成不同分散度
When using the freezing method to dig a well, it is suitable for the irrigation of the well wall with anti-freezing agent. This antifreeze agent can make the concrete compressive strength of 25-30 MPa at the temperature of -15°C-17°C for 28 days. When anti-freezing concrete is used to fill well borehole walls, due to the alternating effects of positive and negative temperatures, it must be ensured that the concrete has a high degree of frost resistance. The use of chemical additives to form the directional structure of cement blocks is a very promising process for ensuring the improvement of the service life of concrete. The use of concrete additives as antifreeze can change the porosity of the concrete and also change the hydration phase structure of the cement. In the hydration process of cement, different degrees of dispersion are formed