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目前国内使用的混凝土外加剂有几个系列上百个品种,而无统一的质量标准,使产品质最难于稳定;国内生产的水泥,其品种繁多,各厂家水泥的化学成分、熟料的矿物组成亦相差甚大,混合材也不尽一致,致使水泥的物理力学性能变化较大。这些都给外加剂的应用带来一定的困难。在施工中所使用的外加剂对不同水泥的适应性问题,是迫切需要了解和掌握的。为此,把经常使用的水泥、外加剂做了净浆凝结时间、混凝土的减水率、增强率、掺入方法等系统试验。从中找出不同的水泥掺不同外加剂对混凝土拌合物和混凝土力学性能影响的一些规律,提出最佳掺量、减水
At present, there are several series of hundreds of varieties of concrete admixtures used in the country, and there is no uniform quality standard, which makes the product quality most difficult to stabilize; the domestic production of cement, its variety, the chemical composition of the cement manufacturers, clinker minerals The composition is also very different, and the mixing materials are not uniform, resulting in a great change in the physical and mechanical properties of the cement. All these have brought certain difficulties to the application of admixtures. The adaptability of the admixtures used in construction to different cements is an urgent need to understand and master. For this purpose, the commonly used cements and admixtures were subjected to system tests such as the setting time of the paste, the concrete water reduction rate, the reinforcement rate, and the method of incorporation. Find out some rules for the influence of different cements mixed with different additives on the mechanical properties of concrete mixes and concrete, and propose the best dosage and water reduction