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石膏对硅酸盐水泥与萘系减水剂相容性的影响 被引量:4

Effect of gypsum on compatibility between cement and sulphonated naphthalene based superplasticizers
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摘要 采用Marsh筒法研究了石膏的种类及掺量对硅酸盐水泥与萘系减水剂相容性的影响。研究结果表明:①水泥中掺加石膏的种类对萘系减水剂的饱和掺量点影响不大。②掺加脱硫石膏的水泥浆体的初始Marsh时间要小于掺加二水石膏的水泥浆体。当减水剂掺量较小时,掺加脱硫石膏时水泥浆体的60min Marsh时间要小于掺加二水石膏的;而当减水剂掺量在2.1%以上时,情况则反之。达到饱和掺量点后,掺有二水石膏的水泥浆体的Marsh时间经时损失率要小于掺有脱硫石膏的水泥浆体。③在萘系减水剂的掺量较小时,随着水泥中石膏掺量的增加,水泥浆体的Marsh时间呈减小趋势;当萘系减水剂掺量增加到一定程度时,随着水泥中石膏掺量的增加,这种趋势不再明显。④对于初始Marsh时间来说,随着石膏掺量的增加,减水剂的饱和掺量点明显下降。而对于60min Marsh时间来说,随着石膏掺量的增加,减水剂的饱和掺量点则保持不变。 The compatibility of the type and conent of gypsum on the compatibility between cement and sulphonated naphthalene based superplasticizers was researched. The results showed that: (1)The type of gypsum in cement had little effect on the saturation dosage point of sulphonated naphthalene based superplasticizers. (2)The initial Marsh time of cement pastes that mixed with dehydrategypsum was shorter than that mixed with gypusm. The 60min Marsh time of cement pastes with gypsum was larger that with dehydrategypsum when the dosage of sulphonated naphthalene based superplasticizers was lower, while the situation would converse for the dosage of sulphonated naphthalene based superqeasticizers was larger than 2.1%. The loss rate of Marsh time of cement pastes with gypsum was less than that with desulphogypsum after the dosage of superplasticizers reached saturation point. (3)When the dosage of sulphonated naphthalene based superplasticizers was low, the Marsh time of cement pastes decreased with the increase of gypsum content. When the dosage of sulphonated naphthalene based superplasticizers increased to a certain point, the Marsh time of cement pastes changed little with the increase of gypsum content. ~For initial Marsh time, the saturation dosage point of superplasticizers reduced significantly when the content of gypsum increased; For 60min Marsh time, the saturation dosage point of superplasticizers kept steady with the content of gypsum increased.
出处 《水泥》 CAS 北大核心 2009年第11期6-9,共4页 Cement
基金 国家科技支撑计划课题(2006BAF02A24) 中国建筑材料集团技术中心项目(JCJ2008-I-01)
关键词 硅酸盐水泥 石膏 脱硫石膏 萘系减水剂:相容性 Portland cement gypsum desulphogypsum sulphonated naphthalene based superplasticizers compatibility
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参考文献2

  • 1王宏伟,王善拔.水泥与减水剂相容性问题雏议[J].混凝土与水泥制品,2001(2):9-11. 被引量:27
  • 2Nakajima Y, Yamada K. The effect of the kind of calcium sulfate in cements on the dispersing ability of poly β-naphthalene sulfonate condensate superplasticizer [J]. Cement and Concrete Research,2004,34: 839-844.

二级参考文献4

  • 1乔龄山.对硅酸盐水泥质量问题的探讨[J].水泥,1996(7):1-6. 被引量:21
  • 2陈建中 范增光 等.萘系减水剂不同掺加方法作用机理的研究.1985年北京国际水泥与混凝土学术会议论文集[M].,1987..
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