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Hydration Characteristics of Cement Paste Containing Supplementary Cementitious Materials

机译:含辅助胶凝材料的水泥浆的水化特性

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An experimental investigation was carried out to evaluate the hydration characteristics and compres-sive strength development of cement paste containing various supplementary cementitious materials (SCMs), viz. pulverised fuel ash (PFA), ground granulated blast-furnace slag (GGBS) and microsilica (MS). Cement pastes were prepared in two series (A and B). Mixes of series A were manufactured with a fixed water-binder ratio of 0.30 and a superplasticiser, whereas the water-binder ratios of mixes in series B were equivalent to those needed for standard consistencies. The XRD and TG data showed that the addition of PFA, GGBS and MS reduced the intensity of Ca(OH)_2 peaks at test ages of 3, 7, 28 and 91 days. The incorporation of PFA and GGBS in the cement paste mixes produced a lower strength value at early age. However, at later ages, the strength was either greater or comparable to the control specimen. Although the compressive strength of cement paste containing 15% MS was greater than that of the PFA and GGBS pastes at all ages, from a cost point of view, it can be suggested that combinations of 40% PFA and 7.5% MS or 50% GGBS and 7.5% MS may be best to improve the hydration properties and compressive strength of cement paste.
机译:进行了一项实验研究,以评估包含各种补充胶凝材料(SCM)的水泥浆的水合特性和抗压强度发展。粉煤灰(PFA),高炉矿渣粉(GGBS)和微硅粉(MS)。水泥浆分为两个系列(A和B)制备。用固定的0.3的水粘合剂比率和高效减水剂生产A系列混合物,而B系列混合物的水粘合剂比率与标准稠度所需的那些相等。 XRD和TG数据表明,在3、7、28和91天的测试年龄,添加PFA,GGBS和MS降低了Ca(OH)_2峰的强度。在水泥浆混合物中掺入PFA和GGBS会在早期产生较低的强度值。但是,在较晚的年龄,强度或大于或等于对照样品。尽管在所有年龄段中,含15%MS的水泥浆的抗压强度均高于PFA和GGBS浆,但从成本角度来看,可以建议使用40%PFA和7.5%MS或50%GGBS的组合7.5%的MS可能是改善水泥浆水化性能和抗压强度的最佳方法。

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