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首页> 外文期刊>American journal of applied sciences >Rational Mix Design Approach for High Strength Concrete Using Sand with very High Fineness Modulus
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Rational Mix Design Approach for High Strength Concrete Using Sand with very High Fineness Modulus

机译：高模量细砂高强度混凝土的合理配合比设计方法

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Problem statement: Production of concrete is always deal with inconsistency. Sources of variation like materials from different geographical basis, mix design method, fineness of aggregates and so on will attribute to different level of achievement of the concrete. Even though researcher had verified that higher fineness modulus of sand would yield better performance for the concrete, but so far there have been scarce amount of paper reported on the mix design method adopting high fineness modulus of sand. Approach: This study discussed the revolution of design mix proportion towards achieving high strength with considerably cement content using local availably constituent materials. A total of 15 mixes was casted till to the high strength at more than 65 MPa was achieved. The compressive strength and workability of each mixes were presented. The method of mixture proportioning was begun with British Department Of Environment (DOE) method. Then, rational design method of achieving high strength concrete was developed. Results: At the end of experimental program, it was found that DOE method was not suitable to apply in designing high strength concrete. 12% was the optimum level of replacement of the total binder content by silica fume. Further increase of total binder content without adjustment to the amount of aggregate content has decreased the strength achievement of the concrete. Very coarse fine aggregate with fineness modulus 3.98 increased the compressive strength of the concrete in large extent. The increased of superplasticiser from 2.0% to 2.5% has decreased the compressive strength of the concrete. Conclusion: The rational mix design approach was developed. A Grade 70 concrete can be produced with moderate level of cement content by this approach.
机译：问题陈述：混凝土的生产始终要处理不一致的问题。变化的来源，例如来自不同地理基础的材料，混合料设计方法，集料的细度等，将归因于混凝土的不同成就水平。尽管研究人员已经证实，较高的砂细度模量会为混凝土带来更好的性能，但是到目前为止，关于采用高砂细度模量的混合设计方法的报道还很少。方法：这项研究讨论了使用当地可用的构成材料，以高水泥含量获得高强度的设计配合比的革命。共浇铸15种混合物，直至达到65 MPa以上的高强度。介绍了每种混合物的抗压强度和可加工性。混合配比的方法从英国环境部（DOE）方法开始。然后，提出了实现高强度混凝土合理设计的方法。结果：在实验程序结束时，发现DOE方法不适用于设计高强度混凝土。用硅粉替代总粘合剂含量的最佳含量为12％。在不调整骨料含量的情况下进一步增加总粘结剂含量会降低混凝土的强度。细度为3.98的非常粗糙的细骨料在很大程度上提高了混凝土的抗压强度。高效减水剂从2.0％增加到2.5％降低了混凝土的抗压强度。结论：开发了合理的混合设计方法。通过这种方法可以生产出水泥含量适中的70级混凝土。

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