蒙脱土对混凝土外加剂分散性能的影响
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摘要
调整混凝土外加剂中聚羧酸减水剂(PC)、牺牲剂(XS)和缓凝剂(HN)的用量,研究蒙脱土对上述混凝土外加剂分散性能的影响。通过水泥净浆流动度和胶砂扩展度表征外加剂的分散性能,并研究蒙脱土对胶砂强度的影响,通过SEM研究蒙脱土对硬化水泥浆体微结构的影响。研究发现:牺牲剂能明显增加外加剂抵抗蒙脱土的能力,当m_(PC):m_(XS):m_(HN):m_(引气剂)=7:3:1:0.05时,混凝土外加剂对含有3%蒙脱土的水泥颗粒分散能力最优。此外蒙脱土的存在会降低硬化砂浆试块的抗压强度,结合SEM分析结果表明蒙脱土的掺加会影响水泥水化,阻碍了AFt和CH的形成,最终导致硬化砂浆抗压强度降低。
引文
[1]蔡黄河,彭振斌.混凝土外加剂的应用与发展[J].科技视界,2015,(22):126-127.
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[4]王子明,吴昊,徐莹等.蒙脱土对聚羧酸减水剂应用性能的抑制机理[J].建筑材料学报,2014,17(2):234-238.
[5]廖国胜,何正恋,刘佩.蒙脱土矿物成分对聚羧酸减水剂吸附性能的研究[J].硅酸盐通报,2015,(1):227-31.
[6]郭清春,王智,党玉栋等.减水剂在水泥及掺合料固体颗粒表面吸附性比较[J].硅酸盐通报,2011,30(10):85-88.
[7]王智,考友哲,王林龙等.单矿物蒙脱土对聚羧酸减水剂分散性的影响与机理[J].建筑材料学报,(3).
[8]L.Lei,J.Plank.A concept for a polycarboxylate superplasticizer possessing enhanced clay tolerance[J].cement and concrete research,2012,42(10):1299-1306.
[9]S.Ng,J.Plank.Interaction mechanisms between Na montmorillonite clay and MPEG-based polycarboxylate superplasticizers[J].cement and concrete research,2012,42(6):847-854.
[10]林宗寿.元机非金属材料工学[M].武汉理工大学出版社2008,203~204.
[11]方云辉.不同引发体系制备保坍型聚羧酸减水剂[J].新型建筑材料,2011,(9):31-33.
[12]Serina Ng,Ezzeldin Metwalli,Peter Miiller-Buschbaum et al.Occurrence of intercalation of PCE superplasticizers in calcium aluminate cement under actual application conditions,as evidenced by SAXS analysis[J].Cement and Concrete Research,2013,54:191-198.
[13]马保国,严敏,谭洪波.含泥量对减水剂性能的影响规律[J].济南大学学报(自然科学版),2012,(4):331-336.
[2]Lei Lei,Johanna de Reese,Johann Plank.Synthesis,Characterization and dispersing performance of a novel cycloaliphatic superplasticizer[C].Tenth international conference on superplasticizers and other chemical admixtures,2012:12-13.
[3]孙振平,黄雄荣.烯丙基聚乙二醇系聚羧酸减水剂的研究[J].建筑材料学报,2009,12(4):407-412.
[4]王子明,吴昊,徐莹等.蒙脱土对聚羧酸减水剂应用性能的抑制机理[J].建筑材料学报,2014,17(2):234-238.
[5]廖国胜,何正恋,刘佩.蒙脱土矿物成分对聚羧酸减水剂吸附性能的研究[J].硅酸盐通报,2015,(1):227-31.
[6]郭清春,王智,党玉栋等.减水剂在水泥及掺合料固体颗粒表面吸附性比较[J].硅酸盐通报,2011,30(10):85-88.
[7]王智,考友哲,王林龙等.单矿物蒙脱土对聚羧酸减水剂分散性的影响与机理[J].建筑材料学报,(3).
[8]L.Lei,J.Plank.A concept for a polycarboxylate superplasticizer possessing enhanced clay tolerance[J].cement and concrete research,2012,42(10):1299-1306.
[9]S.Ng,J.Plank.Interaction mechanisms between Na montmorillonite clay and MPEG-based polycarboxylate superplasticizers[J].cement and concrete research,2012,42(6):847-854.
[10]林宗寿.元机非金属材料工学[M].武汉理工大学出版社2008,203~204.
[11]方云辉.不同引发体系制备保坍型聚羧酸减水剂[J].新型建筑材料,2011,(9):31-33.
[12]Serina Ng,Ezzeldin Metwalli,Peter Miiller-Buschbaum et al.Occurrence of intercalation of PCE superplasticizers in calcium aluminate cement under actual application conditions,as evidenced by SAXS analysis[J].Cement and Concrete Research,2013,54:191-198.
[13]马保国,严敏,谭洪波.含泥量对减水剂性能的影响规律[J].济南大学学报(自然科学版),2012,(4):331-336.