# EFFECT OF MOLECULAR WEIGHT OF POLYCARBOXYLATE-TYPE SUPERPLASTICIZER ON THE RHEOLOGICAL PROPERTIES OF CEMENT PASTES

> Title: EFFECT OF MOLECULAR WEIGHT OF POLYCARBOXYLATE-TYPE SUPERPLASTICIZER ON THE RHEOLOGICAL PROPERTIES OF CEMENT PASTES Page Range: p.725-736 Author(s): Xiongyi Peng; Conghua Yi; Xueqing Qiu; Yonghong Deng File size: 413K Download the pdf (subscribers only) Buy the pdf (non-subscribers) Journal: Polymers and...

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Published: 2012-08-01T00:00:00+00:00
Categories: Polymers and Polymer Composites

**Title: EFFECT OF MOLECULAR WEIGHT OF POLYCARBOXYLATE-TYPE SUPERPLASTICIZER ON THE RHEOLOGICAL PROPERTIES OF CEMENT PASTES**
 Page Range: p.725-736
 Author(s): Xiongyi Peng; Conghua Yi; Xueqing Qiu; Yonghong Deng
 File size: 413K
 ![](http://dload.gif) [Download the pdf](http://journals.asp?Page=111&JournalDownload=ON&JournalType=ppc&JournalIssue=ppc20-8&JournalID=101707&JIP=) (subscribers only)
 ![](http://handbuy.gif) Buy the pdf (non-subscribers)
 Journal: Polymers and Polymer Composites
 Issue Year: ppc
 Volume: 20
 Issue No: No.8

**Abstract**
 In order to study the effect of molecular weight of polycarboxylate-type superplasticiser (PC) on the rheological properties of cement pastes, PCs with different molecular weights (low, medium, high) were synthesised, and used as superplasticisers for cement suspensions. The effect of molecular weight of PC on the zeta potential, adsorption, and rheological behaviour of the corresponding cement suspensions were investigated systematically. Among the PCs, PC with a medium molecular weight always produced the lowest apparent viscosity for cement pastes at the same shear rate. Compared to PC with a low molecular weight, PC with a high molecular weight presented a stronger initial dispersing ability and a weaker dispersing stabilising ability for cement pastes. In addition, PC with a low molecular weight had an advantage over PC with a high molecular weight for reducing the viscosity of paste in the low added dosage or low water/cement ratio, but the latter had the advantage of reducing the viscosity of the paste when the added dosage or water/cement ratio was high. This understanding of the rheological properties of cement pastes incorporating PC will provide an important reference for the application and synthesis of PC with high efficiency. 28 Refs.

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