文献类型：期刊文献

英文题名：The effect of alkyl acrylate ester side chain length of polycarboxylate superplasticizer on the flow behaviour of concrete

作者：Chen, Yujie Chen, Yingying Xie, Yuxiang Liu, Yuan Tao, Jia Liu, Runxia Li, Ziwei Liu, Fei Li, Min

第一作者：Chen, Yujie

通信作者：Li, ZW[1];Liu, F[1];Li, M[1]

机构：[1]Guizhou Univ, Guizhou Prov Key Lab Green Chem & Clean Energy Tec, Sch Chem & Chem Engn, Guiyang 550025, Peoples R China;[2]Guizhou Inst Technol, Sch Civil Engn, Guiyang 550025, Peoples R China;[3]China Railway Fifth Bur Grp Co Ltd, Guiyang 550003, Peoples R China;[4]Guizhou Tianwei Bldg Mat Technol Co Ltd, Guiyang 550025, Peoples R China

第一机构：Guizhou Univ, Guizhou Prov Key Lab Green Chem & Clean Energy Tec, Sch Chem & Chem Engn, Guiyang 550025, Peoples R China

通信机构：corresponding author), Guizhou Univ, Guizhou Prov Key Lab Green Chem & Clean Energy Tec, Sch Chem & Chem Engn, Guiyang 550025, Peoples R China.

年份：2024

卷号：443

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：;EI(收录号：20243216844776);Scopus(收录号：2-s2.0-85200646038);WOS:【SCI-EXPANDED(收录号:WOS:001293923300001)】；

基金：We thank the great help from Xu Ren for performing some additional experiments such as measuring the mortar density and collecting the data during the revision stage of this manuscript. This work was sup-ported by National Natural Science Foundation of China (22168013, 22279024), Key Laboratory of Carbon-based Energy Molecular Chemi-cal Utilization Technology in Guizhou Province (2023008), Science and Technology Department of Guizhou Province (Qian Ke He Ji Chu-ZK [2021] Yi Ban 283), Natural Science Foundation of Guizhou (ZK [2022] 074), National Foreign Expert Project (G2023038002L), China Railway Fifth Bureau Group Co., LTD (China Railway Fifth Ke He Zi [2019] 22), Guizhou Tianwei Building Materials Technology Co., LTD (Tianwei Ke He 2021-02) .

语种：英文

外文关键词：Polycarboxylate superplasticizer; Conformation; Viscosity reduction; Workability; Concrete

摘要：Polycarboxylate superplasticizers (PCEs) are vital to develop concrete-based materials with low CO2 footprint, good fluidity, and workability. Designing PCEs with high dispersion property is specially critical for high strength concrete due to their elevated viscosity. Systematically exploring the effect of side chain length on their conformation, adsorption capacity, and charge distribution on the suspended cement particles, as well as on the flow behavior, and workability of concrete is necessary. Here, PCEs holding a side chain of TPEG-2400 (nEO = 52) were modified with 3 different length of acrylic esters at molar ratios of acrylic acid (AA): macromonomer (MM): ester of 4: 1: 2.5. It was observed that PCE with the shortest ester side chain length (MA-PCE) showed the highest adsorption and electrostatic repulsion due to its lowest surface tension, largest hydrodynamic radius, and highest zeta potential, reducing the solid-liquid interface energy, and exposing the highest amount of negatively charged carboxyl groups to anchor upon the surface of cement particles thereby promoting its dispersion performance and rheological properties. The outstanding dispersing effect of MA-PCE was demonstrated by the T500 and efflux time of concrete. The findings that the side chain length of ester group of PCEs can not only influence their adsorption but also their conformation pave the way to design other high dispersion PCE with high workability of concrete.