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首页> 外文期刊>Magazine of Concrete Research >The effects of precursors on rheology and self-compactness of geopolymer concrete
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The effects of precursors on rheology and self-compactness of geopolymer concrete

机译：前体对地质聚合物混凝土流变和自密实性的影响

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摘要

The inefficiency of typical superplasticisers in geopolymer compared with Portland cement limits the design of a self-compacting concrete. This study investigated the rheology, reactivity and strength of a fly ash, slag and micro fly ash system without superplasticisers in order to find an optimum self-compacting behaviour. The particle size distribution was used to design a mixture of precursors with the highest packing density. The theoretical packing density based on particle size distribution was in close agreement with experimentally obtained packing densities. The effect of the width of the particle size distribution, as determined by the n value in the Rosin-Rammler function, on the rheology of the pastes was confirmed by a close agreement between the predicted yield stress and the experimental values. The initial setting time decreased with the increase in slag and micro fly ash. Finally, a geopolymer concrete was designed that meets the workability requirement of self-compacting concrete with comparable compressive strength without superplasticisers.
机译：与硅酸盐水泥相比，典型的高效减水剂在地聚合物中的效率低下限制了自密实混凝土的设计。这项研究调查了不使用高效减水剂的粉煤灰，矿渣和微粉煤灰系统的流变学，反应性和强度，以寻找最佳的自压缩性能。粒度分布用于设计具有最高堆积密度的前体混合物。基于粒度分布的理论堆积密度与实验获得的堆积密度非常吻合。由松香-拉姆勒函数中的n值确定的粒度分布宽度对糊料流变性的影响已通过预测的屈服应力与实验值之间的紧密一致性得到了证实。初始凝结时间随着炉渣和微粉煤灰的增加而减少。最后，设计了一种土工聚合物混凝土，该混凝土可满足自压缩混凝土的可加工性要求，并且具有可抗压强度相当的无超增塑剂。

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