Investigation of the Effects of Polyurethane-Modified Polycarboxylate at Ambient Temperature on the Characteristics of Cement with Supplementary Cementitious Materials

Author:

Xiang Shuncheng1,Zheng Tingxiang1,Zhang Jiake2ORCID,Jiang Zhen3,Liu Bin3,Huang Liangjun4

Affiliation:

1. School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, China

2. College of Transportation Engineering, Tongji University, Shanghai 200092, China

3. China West Construction Group Co., Ltd. Hunan Branch, Changsha 410082, China

4. Huaihua Dongxing Concrete Co., Ltd., Huaihua 418000, China

Abstract

Via radical polymerization, three polyurethane-modified polycarboxylate molecules of various comb topologies were synthesized. This study investigated the effects of varying types and concentrations of supplementary cementitious materials (SCMs) on the surface tension, flowability, and zeta potential of cement. An elevation in the molar ratio between isoamyl alcohol polyoxyethylene (TPEG) and acrylic acid (AA) from 1:1 to 5:1 reduced the surface tension of the polycarboxylate molecule from 47.70 mN/m to 35.53 mN/m and increased flowability from 280 mm to 310 mm, as the results indicated. An increase in the SCM and polycarboxylate dosage proportionally decreased liquid-phase surface tension and increased flowability. A decrease in the water-to-cement (w/c) ratio from 0.5 to 0.3 corresponded to an observed increase in the zeta potential of cement pastes. However, a rise in the quantity of polycarboxylate and SCMs corresponded to a decrease in the zeta potential at a w/c ratio of 0.3.

Publisher

MDPI AG

Subject

Polymers and Plastics,General Chemistry

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