Influence of cationic polymer on the floccule size of cement pastes containing polycarboxylate superplasticizer and Na-bentonite

IF 2.2 4区工程技术 Q2 MECHANICS

Korea-Australia Rheology Journal Pub Date : 2023-04-27 DOI:10.1007/s13367-023-00057-y

Pengpeng Wen, Zhongjun Feng, Baicun Zheng

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Abstract

Influence of cationic polymer (KN) on the floccule size of cement pastes containing plycarboxylate superplasticizer (PCE) and Na-bentonite was studied. The proportion of floccule size and grain size \({d}_{f}/{d}_{g}\) was obtained from a rheological analysis with the application of Herschel–Bulkley model and modified Krieger–Dougherty model. Herschel–Bulkley model was used to gain the yield stress according to our previous study. Cement pastes were investigated both at the beginning and after one hour. The results showed that a high value of \({d}_{f}/{d}_{g}\) was noticed under low shear rate range and then the proportion decreased with the increase of shear rate. For cement paste containing PCE and Na-bentonite in the absence of KN, larger floccule was formed due to the intercalation of polyethylene glycol branch chain of PCE into the interlayer space of Na-bentonite. However, the floccule size of cement pastes obviously decreased with the increasing addition amount of KN. Thus, KN will restrain the formation of floccules in cement pastes containing PCE and Na-bentonite to a certain extent.

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阳离子聚合物对含聚羧酸盐高效减水剂和钠基膨润土水泥浆体絮凝体尺寸的影响

研究了阳离子聚合物(KN)对聚羧酸高效减水剂(PCE)和钠基膨润土水泥浆体絮凝体尺寸的影响。采用Herschel-Bulkley模型和修正的Krieger-Dougherty模型进行流变分析，得到絮凝体粒径与粒度的比例\({d}_{f}/{d}_{g}\)。根据我们之前的研究，我们采用Herschel-Bulkley模型来获得屈服应力。在开始和一小时后对水泥膏体进行了研究。结果表明:在低剪切速率范围内，\({d}_{f}/{d}_{g}\)值较高，随着剪切速率的增大，该比例逐渐减小;对于含PCE和na -膨润土的水泥浆体，在没有KN的情况下，由于PCE的聚乙二醇支链嵌入na -膨润土的层间空间，形成了较大的絮凝体。随着千牛掺量的增加，水泥浆体的絮凝体尺寸明显减小。因此，KN会在一定程度上抑制含PCE和na -膨润土水泥浆体中絮凝体的形成。

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来源期刊

Korea-Australia Rheology Journal 工程技术-高分子科学

CiteScore

2.80

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Korea-Australia Rheology Journal is devoted to fundamental and applied research with immediate or potential value in rheology, covering the science of the deformation and flow of materials. Emphases are placed on experimental and numerical advances in the areas of complex fluids. The journal offers insight into characterization and understanding of technologically important materials with a wide range of practical applications.