Influence of the HLB value of polycarboxylate superplasticizers on the flow behavior of mortar and concrete

被引：81

作者：

Lange, A. ^{[1
]}

Hirata, T. ^{[2
]}

Plank, J. ^{[1
]}

机构：

[1] Tech Univ Munich, Chair Construct Chem, D-85747 Garching, Germany

[2] Nippon Shokubai Co Ltd, Suita, Osaka 5648512, Japan

来源：

CEMENT AND CONCRETE RESEARCH | 2014年 / 60卷

关键词：

Rheology; Admixture; High-range water reducers; Polycarboxylate;

D O I：

10.1016/j.cemconres.2014.02.011

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Applicators of mortars and concretes admixed with polycarboxylate superplasticizers routinely observe that at low water-to-cement (w/c) ratios (e.g. <0.40), the mortar or concrete can attain a sticky, viscous consistency and honey-like, creeping flow behavior which is highly undesirable for pumping, placement and compaction of such concrete. Only a few special polycarboxylate superplasticizers can provide concretes which flow rapidly (a water-like flow behavior). To investigate the reason behind this rheological behavior, slump cone, flow line and funnel tests were conducted. It was found that the hydrophilic-lipophilic balance (HLB) value of a polycarboxylate copolymer determines whether a PCE will instigate a water-like flow behavior in a concrete. The higher the HLB value, the more hydrophilic is the molecule and the stronger the flow speed enhancing effect. From the PCEs tested, the APEG-types produced the best water-like flow behavior, followed by IPEG- and MPEG-type PCEs. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：45 / 50

页数：6

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