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Workability and strength behaviour of concrete with cold-bonded fly ash aggregate

机译：粉煤灰冷粘结骨料混凝土的可加工性和强度性能

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摘要

This paper discusses the development of empirical models for workability and compressive strength of cold-bonded fly ash aggregate concrete in terms of mixture proportioning variables such as cement content, water content and volume fraction of cold-bonded aggregate through statistically designed experiments based on Response Surface Methodology. Factor level of cement is taken from 250 to 450 kg/m~3 to introduce weak as well as strong matrix phase in the concrete. Apart from water content, workability of concrete is highly influenced by main and interaction effect of volume fraction of cold-bonded aggregate in the composition. Response surface indicate that increase in cement content causes to change the predominant failure mode from mortar failure to aggregate fracture and concrete strength decreases with increase in volume fraction of aggregate at higher cement contents. The models developed have been found useful in arriving typical relationship to establish a mixture proportioning methodology for cold-bonded fly ash aggregate concrete.
机译：本文通过基于响应面的统计设计实验，探讨了水泥胶结含量，含水量和体积分数等配合比变量对冷粘粉煤灰骨料混凝土工作性和抗压强度经验模型的发展。方法。水泥的因子水平为250至450 kg / m〜3，以在混凝土中引入弱相和强相。除含水量外，混凝土中的可加工性还受组合物中冷粘结骨料体积分数的主要作用和相互作用的影响。响应面表明，水泥含量的增加会导致从砂浆破坏到骨料断裂的主要破坏模式发生改变，并且随着水泥含量的增加，混凝土强度会随着骨料体积分数的增加而降低。已经发现开发的模型对于建立典型关系以建立冷粘结粉煤灰骨料混凝土的混合配比方法很有用。

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