Influence of the Aqueous Phase of Cement Paste on the Rheology in the Presence of PCE

"SP-329: Superplasticizers and Other Chemical Admixtures in Concrete Proceedings Twelfth International Conference, Beijing, China" Pub Date : 2018-09-26 DOI:10.14359/51711232

W. Schmidt, S. Leinitz, B. Mota, C. Crasselt

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引用次数: 4

Abstract

The paper presents rheometric results and hydration curves for cementitious systems based on cement mixed with different aqueous phases at solid volume fraction of  = 0.45. The varied aqueous phases were deionized water, limewater, the filter residue of a cement paste mixed at w/c = 2.0, and the filtrate of cement paste at solid volume fraction of 0.45. Each cementitious system provided different amounts and sizes of particles formed in the aqueous phase. The pastes were observed with and without polycarboxylate ether based superplasticizer. It was observed that the presence of particles causes higher PCE saturation dosages to achieve a minimum value, but the minimum value is only affected in the case of large particles. In all cases with and without PCE, the presence of small particles causes increased plastic viscosity. In addition, with decreased number and size of hydrates in the aqueous phase the hydration was retarded, which was specifically pronounced in the presence of PCE

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PCE存在下水泥浆体水相对流变性能的影响

本文给出了固体体积分数为0.45时不同水相水泥胶凝体系的流变学结果和水化曲线。水相分别为去离子水、石灰水、w/c = 2.0水泥浆的过滤渣、0.45固相体积分数水泥浆的滤液。每种胶凝体系提供了不同数量和大小的水相形成的颗粒。用聚羧酸醚基高效减水剂和不加聚羧酸醚基高效减水剂对膏体进行了观察。观察到，颗粒的存在使PCE饱和剂量达到最小值，但最小值仅在大颗粒的情况下受到影响。在所有有或没有PCE的情况下，小颗粒的存在都会导致塑料粘度的增加。此外，随着水相中水合物数量和大小的减少，水化作用被延缓，这在PCE的存在下尤为明显

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"SP-329: Superplasticizers and Other Chemical Admixtures in Concrete Proceedings Twelfth International Conference, Beijing, China"

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