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首页> 外文期刊>Leonardo Electronic Journal of Practices and Technologies >Determination of appropriate mix ratios for concrete grades using Nigerian Portland-limestone grades 32.5 and 42.5
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Determination of appropriate mix ratios for concrete grades using Nigerian Portland-limestone grades 32.5 and 42.5

机译：使用尼日利亚波特兰-石灰石等级32.5和42.5确定混凝土等级的合适配合比

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The construction of buildings by incompetent craftsmen and the use of low quality building materials, including low quality concrete have been identified in the literature as two of the major reasons for the incessant collapse of building in Nigeria . The roadside craftsmen/artisans usually/generally construct buildings using 1:2:4 cement-fine aggregate-large aggregate mix ratio irrespective of the cement strength class. In this paper, the investigation conducted to determine the appropriate concrete mix ratios required to produce Class 20/25 and Class 25/30 concretes commonly used for design of building structural members using the Portland-limestone cement grades 32.5 and 42.5 that are available in the Nigerian open market is presented. Investigation revealed that the cube compressive strength of 1:2:4 concrete produced with Portland-limestone cement grade 32.5 is less than the minimum 25MPa required for concrete Class 20/25 and a richer 1:1.5:3 concrete produced with Portland-limestone cement grade 32.5 may be needed to produce concrete Class 20/25. Investigation also revealed that Portland-limestone cement grade 32.5 may not be suitable for the production of concrete class 25/30 with cube compressive strength of 30MPa as the cube compressive strength of 1:1:2 concrete produced with Portland-limestone cement grade 32.5 may not attain 30MPa. Concrete strength classes 20/25 and class 25/30 can be produced with Portland-limestone cement grade 42.5 using 1:2:4 and 1:1.5:3 mix ratios respectively. To produce concrete with strength class C20/25 which is the minimum concrete strength class recommended for the construction of the load-bearing building structural members using the 1:2:4 mix ratio, Portland-limestone cement grade 42.5 is required.
机译：文献中已经确定，由不称职的工匠建造建筑物以及使用劣质建筑材料（包括劣质混凝土）是尼日利亚建筑持续倒塌的两个主要原因。路边的工匠/工匠通常/通常使用1：2：4水泥-细骨料-大骨料混合比建造建筑物，而与水泥强度等级无关。在本文中，进行了调查，以确定生产20/25级和25/30级混凝土所需的合适混凝土配合比，这些混凝土通常使用32.5和42.5级的硅酸盐-石灰石水泥设计，用于建筑结构构件的设计。介绍了尼日利亚的公开市场。调查显示，使用32.5级硅酸盐​​-石灰石水泥生产的1：2：4混凝土的立方抗压强度低于20/25级混凝土和采用硅酸盐-石灰石水泥生产的更丰富的1：1.5：3混凝土所需的最小25MPa。生产20/25级混凝土可能需要32.5级。调查还显示，波特兰-石灰石水泥等级32.5可能不适合生产立方抗压强度为30MPa的25/30级混凝土，因为波特兰-石灰石水泥等级32.5可能会产生1：1：2的立方体抗压强度不能达到30MPa。可以使用42.5级的硅酸盐-石灰石水泥分别使用1：2：4和1：1.5：3的混合比生产20/25级和25/30级的混凝土强度。要生产强度等级C20 / 25的混凝土，该强度等级是建议的混合比为1：2：4的承重建筑结构构件的最低混凝土强度等级，则需要42.5级的硅酸盐-石灰石水泥。

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