Design, Synthesis of Viscosity-reducing Polycarboxylate Superplasticizer and Its Influence on Cement-Silica Fume Paste with Low Water-binder Ratio
BAI Jingjing1, WANG Min1, SHI Caijun1, SHA Shengnan1, XIANG Shuncheng2, ZHOU Beibei1, MA Yihan1
1 Key Laboratory for Green and Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China; 2 School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, China
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.
作者简介: 白静静,2016年6月毕业于河南理工大学,获得工学学士学位。现为湖南大学土木工程学院硕士研究生,在史才军教授的指导下进行研究。目前主要研究领域为聚羧酸减水剂的制备及应用;史才军,国家第二批“千人计划”特聘专家、湖南省特聘专家、亚洲混凝土联合会副主席、湖南大学985工程创新平台首席科学家、特聘教授、博士研究生导师,Taylor and Francis 学术期刊Journal of Sustainable Cement-based Materials创刊主编,Journal of Ceramics in Modern Technologies共同主编、中国硅酸盐学会会刊《硅酸盐学报》副主编,Elsevier著名学术期刊Cement and Concrete Research和Cement and Concrete Composites、Construction and Building Materials、Taylor & Francis学术期刊Journal of Structural Integrity and Maintenance、西班牙Materiales de Construccion、《材料导报》《建筑材料学报》《重庆交通大学学报》及《中国水泥》等期刊编委。在水泥和混凝土材料的设计、测试、耐久性、智能防渗漏材料及废物的利用和处置方面做了广泛深入的研究工作,发表高水平学术论文300余篇。出版英文著作7部,中文著作3部,合编国际会议英文论文集6本。2014年获湖南省“潇湘友谊”奖。2015-2017年“建设与建造”领域中国高被引学者,2016年全球土木工程领域高被引学者,2001、2007和2016年分别当选为国际能源研究会、美国混凝土学会及国际材料与结构联合会的会士 (Fellow)。
引用本文:
白静静, 王敏, 史才军, 沙胜男, 向顺成, 周贝贝, 马一菡. 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[J]. 材料导报, 2020, 34(6): 6172-6179.
BAI Jingjing, WANG Min, SHI Caijun, SHA Shengnan, XIANG Shuncheng, ZHOU Beibei, MA Yihan. Design, Synthesis of Viscosity-reducing Polycarboxylate Superplasticizer and Its Influence on Cement-Silica Fume Paste with Low Water-binder Ratio. Materials Reports, 2020, 34(6): 6172-6179.
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2020, Vol. 34 
