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Reducing setting time of blended cement paste containing high-SO3 fly ash (HSFA) using chemical/physical accelerators and by fly ash pre-washing

机译:使用化学/物理促进剂和粉煤灰预洗减少含有高SO3粉煤灰(HSFA)的水泥浆的凝结时间

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摘要

Reducing the carbon footprint of the cement industry has become one of the main concerns of researchers in the field. This study explores different strategies to reduce the setting retardation effect of high-SO3 fly ash (HSFA) on cement paste. The SO3 phase was found to correspond to hannebachite (CaSO3·0.5H2O). Chemical (calcium chloride), physical (fine limestone powder), and pre-washing strategies were investigated as means to reduce or eliminate the retardation. Each of these strategies showed some potential to decrease the retardation effect. A combination of fine limestone powder and HSFA pre-washing showed almost the same accelerating power as the calcium chloride, offering a good alternative when chloride incorporation is restricted. The retardation effect can be associated with a combined extension of the induction period and a depression of the initial silicate reactions of the clinker phases. A methodology to assess the hannebachite content based on a thermogravimetric analysis (TGA) technique is proposed, allowing a good alternative control approach for field conditions or for where X-ray (XRD or XRF) equipment is not readily available.
机译:减少水泥工业的碳足迹已经成为该领域研究人员的主要关注之一。这项研究探索了不同的策略来减少高SO3粉煤灰(HSFA)对水泥浆凝结的影响。发现SO3相对应于钙锰矿(CaSO3·0.5H2O)。研究了化学(氯化钙),物理(石灰石细粉)和预洗策略作为减少或消除延迟的手段。这些策略中的每一种都显示出降低延迟作用的潜力。石灰石细粉和HSFA预洗的组合显示出与氯化钙几乎相同的加速能力,当限制氯化物的掺入时提供了很好的替代方法。阻滞作用可能与诱导期的延长和熟料相的初始硅酸盐反应的降低有关。提出了一种基于热重分析(TGA)技术评估菱锰矿含量的方法,为现场条件或X射线(XRD或XRF)设备不可用的情况提供了一种很好的替代控制方法。

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