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Hierarchical Order of Influence of Mix Variables Affecting Compressive Strength of Sustainable Concrete Containing Fly Ash Copper Slag Silica Fume and Fibres

机译：混合变量影响粉煤灰铜渣硅粉和纤维的可持续混凝土抗压强度影响的层次顺序

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摘要

Experiments have been conducted to study the effect of addition of fly ash, copper slag, and steel and polypropylene fibres on compressive strength of concrete and to determine the hierarchical order of influence of the mix variables in affecting the strength using cluster analysis experimentally. While fly ash and copper slag are used for partial replacement of cement and fine aggregate, respectively, defined quantities of steel and polypropylene fibres were added to the mixes. It is found from the experimental study that, in general, irrespective of the presence or absence of fibres, (i) for a given copper slag-fine aggregate ratio, increase in fly ash-cement ratio the concrete strength decreases and with the increase in copper slag-sand ratio also the rate of strength decrease and (ii) for a given fly ash-cement ratio, increase in copper slag-fine aggregate ratio increases the strength of the concrete. From the cluster analysis, it is found that the quantities of coarse and fine aggregate present have high influence in affecting the strength. It is also observed that the quantities of fly ash and copper slag used as substitutes have equal “influence” in affecting the strength. Marginal effect of addition of fibres in the compression strength of concrete is also revealed by the cluster analysis.
机译：已经进行了实验，以研究粉煤灰，铜渣，钢和聚丙烯纤维的添加对混凝土抗压强度的影响，并通过实验聚类分析来确定混合变量对强度的影响的等级顺序。尽管粉煤灰和铜渣分别用于水泥和细骨料的部分替代，但将一定量的钢和聚丙烯纤维添加到混合物中。从实验研究中发现，通常，不管存在或不存在纤维，（i）对于给定的铜渣-细骨料比例，粉煤灰-水泥比的增加，混凝土强度会降低，而随着粉煤灰比的增加，铜渣-砂比也降低了强度，并且（ii）对于给定的粉煤灰-水泥比，铜渣-细骨料比的增加提高了混凝土的强度。从聚类分析中发现，存在的粗骨料和细骨料的数量对强度的影响很大。还观察到，用作替代品的粉煤灰和铜渣的量在影响强度方面具有相同的“影响”。聚类分析也揭示了添加纤维对混凝土抗压强度的边际效应。

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