Materials Reports  2020, Vol. 34 Issue (Z1): 592-595 |
| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Effect of Whether or Not to Adopt Neutralization on the Performance ofPolycarboxylate Superplasticizer and Mechanism Analysis |
| WU Yonghua, ZHU Ting, DANG Zixuan, LI Ying, LI Guoxin
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| College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China |
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Abstract The neutralization process of polycarboxylate superplasticizers in the synthesis process has a significant effect on the property of product. The effects of neutralization process on the dispersion, adsorption capacity, thickness of adsorption layer, initial conformation and adsorption conformation of polycarboxylate superplasticizer were studied by cement paste fluidity, total organic carbon analyzer, X-ray photoelectron spectroscopy, infrared spectroscopy, dynamic light scattering and Zeta potential. The results showed that compared with the neutralization process, when polycarboxylate superplasticizers produced by unneutralized process was mixed with cement, the initial fluidity of cement paste was higher, the loss of fluidity was smaller and the adaptability to cement was better. At the same dosage, the adsorption amount of unneutralized polycarboxylate superplasticizer is lower, but the thickness of the adsorption layer is thicker. Due to the fact that the initial conformation branched chain of the unneutralized polycarboxylate superplasticizer molecule in the solution is more extended, the adsorption conformation after adsorption also occupies a larger space, so that the adsorption layer is thicker, and the dispersibility of the cement particles is better.
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Published: 01 July 2020
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| Fund:This work was financially supported by the Scientific and Technological Research Projects for Social Development in Shaanxi Province (2016SF-443). |
| About author:: Yonghua Wu, Ph.D., master supervisor, associate professor. He is mainly engaged in the research of mec-hanism and application of concrete water-reducing agent. |
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