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长期以来我国执行有关水泥的标准是《普通硅酸盐水泥,火山灰质硅酸盐水泥与矿渣硅酸盐水泥》GB175—62,《水泥物理检验标准方法》GB177—62及《水泥试验用标准砂》GB178—62。这些标准已为大家所熟悉和应用,它在提高水泥质量,保证基本建设工程质量等方面起了一定的积极作用。但是上述这些标准的制订,限于我国当时历史条件的限制,基本上都是照搬四十年代苏联的标准,现在经过二十多年的实践,逐步发现和暴露了一些问题,随着国际情况的发展,国际水泥标准化组织在1968年又作了关于用软练作为国际标准检验方法的规定。因此,原有水泥标准已不适应目前的需要。为此,我国在总结二十多年来实践经验的基础上,对原有旧水泥标准的内容作了修改和增补,制订了水泥新标准。新标准包括《硅酸盐水泥,普通硅酸盐水泥》GB175—77,《矿渣硅酸盐水泥,火山灰质硅酸盐水泥,粉煤灰硅酸盐水泥》GB1344-77,《水泥细度检验方法(筛分析)》GB1345-77,《水泥标准稠度用水量、凝结时间、安定性检验方法》GB1346—77,《水泥胶砂强度检验方法》GB177—77和《水泥强度试验用标准砂》GB178—77等六种国家标准。按照国家规定,水泥新标准将从一九七九年七月一日开始在全国试行。新旧标准将平行过渡半年,从一九八○年一月一日开始在全国范围内实行水泥新标准。为了妥善做好这个新旧标准的过渡工作。我们综合了一些主要的水泥新标准与原有的旧标准的对比材料,包括从内容、条文、品质、试验方法、设备、操作等各个方面,供我局广大施工技术人员学习和掌握。希望我局有关技术人员,从思想上重视这项工作,认真学习新标准,掌握新标准。並同时做好指导、培训、宣传和落实工作。从而避免在新旧水泥标准交替过渡时期引起混乱,造成给国家不应有的损失和浪费,确保新标准如期如质地全面执行。
For a long time, the standards for cement implementation in China are “Ordinary Portland Cement, Pozzolanic Portland Cement and Slag Portland Cement” GB175-62, “Standard Method for Physical Testing of Cement” GB177-62, and “Standard Sand for Cement Testing”. “GB178-62. These standards have been known and applied by everyone. It has played a positive role in improving cement quality and ensuring the quality of capital construction projects. However, the formulation of these standards was limited to the limitations of historical conditions in China at that time. Basically, they copied the Soviet Union’s standards in the 1940s. Now, after more than 20 years of practice, some problems have been gradually discovered and exposed, and international conditions have developed. In 1968, the International Cement Standardization Organization also made provisions for the use of soft training as an international standard inspection method. Therefore, the original cement standard has not been adapted to current needs. Therefore, on the basis of summing up more than two decades of practical experience, China has revised and supplemented the content of the old cement standards and formulated new cement standards. The new standards include ”Portland cement, ordinary Portland cement“ GB175-77, ”Slag Portland cement, pozzolanic Portland cement, fly ash Portland cement“ GB1344-77, ”cement fineness test Method (sieve analysis) GB1345-77, “Constant water consistency of cement, test method for setting time, stability” GB1346-77, “Test method for strength of cement mortar” GB177-77 and “Standard sand for cement strength test” GB178 - 77 other six national standards. According to the national regulations, the new cement standard will be implemented nationwide on July 1, 1979. The new and old standards will be transitioned in parallel for six months. From January 1, 1980, new standards for cement will be implemented nationwide. In order to properly complete this transitional work of the new and old standards. We have compared some of the major new cement standards with the old ones, including the contents, provisions, quality, test methods, equipment, and operations, for the majority of our construction technicians to learn and master. I hope the relevant technical personnel of the Bureau will pay attention to this work ideologically, earnestly study new standards and master new standards. At the same time, it will provide guidance, training, publicity and implementation. In order to avoid confusion during the transitional period between the old and new cement standards, it will cause undue losses and waste to the country and ensure that the new standards are fully implemented as scheduled.