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蒸养硅酸盐制品在生产过程中容易产生裂缝,分析其原因,约有以下几点:一、由原材料质量和用量引起的1.石灰的影响。在配制硅酸盐混凝土时,适当提高石灰用量可增加制品的强度和耐久性。但过量的石灰会使硅酸盐混凝土在硬化过程中的体积膨胀加剧,产生裂缝。当石灰的消解速度过快及积聚较多的热量时,会使制品的温度急剧上升,产生较大的内应力,使制品表面胀裂。根据我们的试验,当石灰消解温度大于70℃,每立方米硅酸盐混凝土的石灰用量超过总重量10%(占拌和胶结材的25%)时,裂缝很难避免,且多
Steam-cured silicate products are prone to cracks in the production process. The reasons for the analysis are as follows: 1. The effect of lime caused by the quality and quantity of raw materials. In the preparation of silicate concrete, an appropriate increase in the amount of lime can increase the strength and durability of the product. However, excess lime can increase the volumetric expansion of the Portland concrete in the hardening process and cause cracks. When the digestion speed of lime is too fast and a large amount of heat is accumulated, the temperature of the product will rise sharply, resulting in a greater internal stress and causing the surface of the product to burst. According to our tests, when the lime digestion temperature is greater than 70°C and the amount of lime per cubic meter of the Portland concrete exceeds 10% of the total weight (25% of the cementitious mix), cracks are difficult to avoid and many