降粘性聚羧酸减水剂的设计合成及在低水胶比水泥-硅灰体系中的作用

doi:10.11896/cldb.19040139

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Abstract Existing superplasticizer cannot meet the requirements of fluidity and viscosity regulation of cementitious materials with low water-binder ratio and high silica fume (SF) content. A novel type viscosity-reducing polycarboxylate superplasticizer (S-PCEs) was synthesized by free radical copolymerization as the ammonium persulfate (APS) was initiator, acrylic acid (AA), maleic anhydride (MAH), 2-acrylamide-2-methylpropane sulfonic acid (AMPS), vinyltriethoxysilane (VTEO) and allyl alcohol polyoxyethylene ether (APEG) were monomers. Firstly, the structure of S-PCEs was characterized by Fourier transform infrared spectrometer (FTIR) and gel permeation chromatography (GPC). Secondly, the physico-chemical characterizations of the S-PCEs and commercially available polycarboxylate superplasticizer (C-PCEs) and their effects on the fluidity, rheological and thixotropic properties of cement-silica fume paste with low water-binder ratio were compared. Last but not least, the wor-king mechanisms of S-PCEs were investigated. The results showed that S-PCEs had good dispersibility for cement-silica fume paste with low water-binder ratio. The initial fluidity and 60 min fluidity of cement-silica fume paste with low water-binder ratio (w/b=0.18) were 22.37% and 20.83% higher than those of C-PCEs. What's more, with the decrease of water-binder ratio or the increase of silica fume content, the superiority of S-PCEs were more obvious. Compared with C-PCEs, the yield stress of cement-silica fume paste with low water-cement ratio decreased by 7.95%, the equivalent plastic viscosity decreased by 61.31% and the area of thixotropic ring decreased by 52.98% with the addition of S-PCEs. On the one hand, S-PCEs had strong adsorption capacity on the surface of cement and silica fume, so the flocculation structure was well disper-sed. On the other hand, the surface tension of the liquid and the solid-liquid interface of the system containing S-PCEs were lower. The binding water on the particles surface of cementitious materials was less. Therefore, there were more free-water in cement-silica fume paste, which resulted to better fluidity and low viscosity.

Key words： viscosity-reducing polycarboxylate superplasticizer (S-PCEs) low water-binder ratio silica fume dispersion

Published: 12 March 2020

CLC number:

TU528.042

Fund:This work was financially supported by the National Key R&D Program of China (2018YFC0705400).

About author:: Jingjing Baireceived her B.S. degree in June 2016 from Henan Polytechnic University. She is currently pursuing her M.S. at the Institute of Civil Engineering, Hunan University under the supervision of Prof. Caijun Shi. Her research has focused on the preparation and application of polycarboxylate superplasticizer; Caijun Shiis currently a chair professor of College of Civil Engineering, Hunan University and China Academy of Building Materials, the second National “Thousand People Plan” Specially-invited Expert, Hunan Appointed Expert, Vice chairman of Asian concrete Federation, doctoral supervisor. He is an Editor-in-Chief of Journal of Sustainable Cement-based Materials, Co-Editor of Journal of Ceramics in Modern Technologies, associate editor of Journal of Materials in Civil Engineeringand Journal of Chinese Ceramic Society, and an editorial board member of Cement and Concrete Research, Cement and Concrete Composites, Construction and Building Materials, Materials Reportrsand Journal of Buil-ding Materials.His research interests include characterization and utilization of industrial by-products and waste materials, design and testing of cement and concrete materials, development and evaluation of cement additives and concrete admixtures, and solid and hazardous waste management. He has authored/coauthored more than 320 technical papers, seven English books, three Chinese books and edited/co-edited six international conference proceedings. In recognizing his contributions to researches in waste management and concrete technology, he was elected as a fellow of International Energy Foundation in 2001, a fellow of American Concrete Institute in 2007,and a fellow of RILEM in 2016.

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	BAI Jingjing
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Cite this article:

BAI Jingjing,WANG Min,SHI Caijun, et al. Design, Synthesis of Viscosity-reducing Polycarboxylate Superplasticizer and Its Influence on Cement-Silica Fume Paste with Low Water-binder Ratio[J]. Materials Reports, 2020, 34(6): 6172-6179.

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http://www.mater-rep.com/EN/10.11896/cldb.19040139 OR http://www.mater-rep.com/EN/Y2020/V34/I6/6172

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