Preparation, Characterization and Performances of Powdered Polycarboxylate Superplasticizer with Bulk Polymerization

被引：31

作者：

Liu, Xiao ^{[1
]}

Wang, Ziming ^{[1
]}

Zheng, Yunsheng ^{[2
]}

Cui, Suping ^{[1
]}

Lan, Mingzhang ^{[1
]}

Li, Huiqun ^{[1
,3
]}

Zhu, Jie ^{[1
]}

Liang, Xu ^{[1
]}

机构：

[1] Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

[2] State Key Lab Solid Waste Reuse Bldg Mat, Beijing 100041, Peoples R China

[3] China Bldg Mat Acad, Dept Technol, Beijing 100024, Peoples R China

来源：

MATERIALS | 2014年 / 7卷 / 09期

基金：

中国国家自然科学基金;

关键词：

polycarboxylate; superplasticizer; powdered; fluidity; cement; CEMENT; ADMIXTURES; CONCRETE; BEHAVIOR;

D O I：

10.3390/ma7096169

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A polycarboxylate superplasticizer (PCE) was synthesized in a non-solvent system with bulk polymerization and then was pulverized into powdered form to achieve a rapid transportation and convenient preparation. PCE synthesized by using isopentenyl polyethylene glycol (TPEG) or isobutenyl polyethylene glycol (IPEG) as a macromonomer exhibited the best fluidities and retaining properties at 80 degrees C and 75 degrees C, respectively. Besides, azobisisobutyronitrile (AIBN) was suitable as an initiator, and the fumaric acid was suitable as the third monomer. The test results of H-1 nuclear magnetic resonance (H-1 NMR) confirmed the occurrences of polymerization, and the measurement results of molecular weight and distribution showed that PCE molecular weight characteristics were in accordance with their fluidity properties in cement paste. The application performances in cement showed that PCEs with the best paste fluidity retentions had the longest final setting time and the shortest setting time interval, and the PCEs with good fluidity properties can obviously delay the hydration process and lower the hydration heat. Accordingly, this is a novel, energy-saving and economical method to prepare powdered PCE in the field of concrete admixtures.

引用

页码：6169 / 6183

页数：15

共 37 条

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