在党的正确领导下,目前我国工农业以及国民经济的各个方面,都出现了大跃进的新形势.在发展农业生产中,农田水利建设是十分重要的,今后在农村中,水泥的需要量必将日益增加.目前,水泥供应不能满足需要的情况下就要采用石灰代替水泥.石灰是气硬性胶凝材料,它合水后在空气中吸收二氧化碳,由氢氧化钙变成碳酸钙而发生硬化,这使用于地上工程是完全可靠的,但用在水利工程中却不能保证工程质量.试验证明:用石灰制成的砂浆试体,即使在空气中硬化数天甚至数星期,以后再放在水中,这些试体还会重新吸收水份,并渐渐松散而崩溃.另一方面,根据试验和施工经验证明:每一种标号的混凝土必须用与它相适应的标号的水泥来制造.相适应的标 Under the correct leadership of the Party, a new leap forward has emerged in all aspects of China’s industry and agriculture and the national economy. In the development of agricultural production, irrigation and water conservancy construction is very important. In the future, the demand for cement in rural areas Will increasingly increase. At present, the cement supply can not meet the needs of the situation, we must use lime instead of cement. Lime is a gas hard cementitious material, it combines water in the air to absorb carbon dioxide, from calcium hydroxide to calcium carbonate occurs Hardening, which is completely reliable for use in above-ground engineering, but it cannot be used in hydraulic engineering. The test proves that the mortar made of lime is hardened even after several days or even weeks in the air. In the water, these samples will also re-absorb moisture, and gradually loose and collapse. On the other hand, according to test and construction experience, it is proved that each type of concrete must be made of cement corresponding to its label. Adaptation standard