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首页> 外文期刊>Journal of Applied Polymer Science >Optimization of comb-shaped polycarboxylate cement dispersants to achieve fast-flowing mortar and concrete
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Optimization of comb-shaped polycarboxylate cement dispersants to achieve fast-flowing mortar and concrete

机译：优化梳形聚羧酸盐水泥分散剂以实现砂浆和混凝土的快速流动

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摘要

Concretes and mortars possessing a low water-to-cement (w/c) ratio (<0.40) liquefied with comb-shaped polycarboxylate (PCE) copolymers commonly exhibit a sticky, honey-like consistency, and slow flow behavior. The stickiness is owed to high plastic viscosity of the suspension. In this study, different PCE comb polymers based on methacrylate ester, allyl, vinyl, and isoprenyl ether macromonomers were synthesized and analyzed. It was found that their hydrophilic-lipophilic balance (HLB) value, i.e., the balance between the hydrophilic and lipophilic parts in these PCE molecules determines their effect on the plastic viscosity of a concrete. PCE copolymers mainly composed of hydrophilic parts, i.e., such possessing high HLB values, impart low plastic viscosity. Allyl ethermaleic acid based PCEs exhibit especially high HLB values and thus impart low plastic viscosity. Higher viscosities were recorded for isoprenylether PCEs, while methacrylate-ester and vinyl ether PCEs possess particularly low HLB values and hence produce a pronounced sticky concrete. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42529.
机译：具有低水灰比（w / c）（<0.40）且被梳状聚羧酸盐（PCE）共聚物液化的混凝土和砂浆通常表现出粘性，蜂蜜般的稠度和缓慢的流动性能。粘性归因于悬浮液的高塑料粘度。在这项研究中，合成和分析了基于甲基丙烯酸酯，烯丙基，乙烯基和异戊二烯基醚大分子单体的不同PCE梳型聚合物。发现它们的亲水-亲脂平衡（HLB）值，即这些PCE分子中亲水和亲脂部分之间的平衡，决定了它们对混凝土塑性粘度的影响。 PCE共聚物主要由亲水部分组成，即，具有高HLB值的那些，赋予低塑料粘度。基于烯丙基醚马来酸的PCE具有特别高的HLB值，因此可提供低的塑料粘度。异戊二烯基醚PCE的粘度更高，而甲基丙烯酸酯和乙烯基醚PCE具有特别低的HLB值，因此产生明显的粘性混凝土。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，42529。

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