【摘要】 我国硅酸盐水泥、普通水泥、矿渣水泥、火山灰水泥、粉煤灰水泥等常用水泥的新标准即将于1980年1月1日全面实施。论文介绍了为修改标准所进行的大量科研工作,提出了标准修改的各项技术依据。着重讨论了水泥品种和混合材掺量、熟料中氧化镁指标、三氧化硫含量以及强度测试方法和标号划分等四个问题。对于增设硅酸盐水泥和粉煤灰水泥两个品种、熟料氧化镁指标从4.5％放宽到6.0％(5～6％时须经压蒸试验合格)、三氧化硫限量从3.0％放宽至3.5％(矿渣水泥放宽至4.0％)、强度试验方法从硬练法改为软练法、水泥新标号的划分以及水泥标号换算混凝土标号的经验公式等作了详细的论述。并对这次我国水泥标准修订后将在扩充品种、提高质量、资源利用及确保工程质量等方面产生的经济效果作了具体分析。更多还原

【Abstract】 The newly revised standards relating to ordinarily used cements of our country-portland cement, ordinary portland cement, portland blast-furnace slag cement, portlandpozzolan cement and portland fly-ash cement,will be officially adopted from Jan. 1st 1980-Various technical data from research works on revision have been presented. Discus-sions have principally taken on the limitations of additions in various types of cement,MgO in clinkers, SO₃ contents and the test and gradation for strength of cements. The reasons for establishment of two new types of cement——portland （witbout addi- tions ） cement and portland fly-ash cement, the upper limit of MgO in clinker changesfrom 4.5% to 6.0% （on 5～6% shall pass the autoclave test ）, of SO₃ from 3.0% to 3.5%（4.0% for portland blast-furnace slag cement ）, the strength test changes from earth-dry mortar test to plastic mortar test, the gradation of cement and the relation betweencement grades and concrete grades have been discussed in detail. Economical advantages from the revision of cement standards including more types ofcement produced, more resoures of raw materials utilized and improved quilites of ce-ment produced have been analysed particularly.更多还原