聚羧酸盐混凝土高效减水剂的合成

论文编号:HG054  论文字数:10726,页数:24

摘  要：水泥减水剂的作用，就是加入到混凝土中可明显减少拌和水泥混凝土时所加入的水量，同时大大提高水泥混凝土浆料的流动性能和水泥混凝土的强度，从而提高工程的质量。二步法合成减水剂由于生产所耗时间长，含固量不高，溶解度不高等原因，促使人们迫切开发新的高效减水剂。本文简述了实验研制的聚羧酸型减水剂即烯丙基系减水剂的研究,简要介绍了减水剂的研究前景、分类、减水机理,以及烯丙基系减水剂的生产流程，重点讨论了投料方式, 原料厂家,SMAS的添加,含固量,EO数目,AA:APEG配比和pH值等因素对烯丙基减水剂效果的影响,并且从水泥净浆流动性,保持性和混凝土的流动性比较了本实验研制的聚羧酸减水剂和采用二步法合成的聚羧酸减水剂,萘系减水剂以及其他减水剂产品的实验效果，最后得出总结。
关键词:对比实验 ；AA:APEG摩尔比 ；EO数目
   
 The Synthesis of Concrete Polycarboxylate Superplasticizer
 

Abstract: The function of the cement superplasticizer is to reduce the amount of water used in mixing concrete, to enhance the fluidity of concrete slurry and strength, so as to improve the quality of the projects. The long time of the first generation of cement superplasticizer taken in producing, low solid content require an advanced type of superplasticizer. This paper briefly studied the advanced polycarboxylate superplasticizer - the allyl group superplasticizer whose future development, sorts, the principle of its function on reducing water and its production flow are concerned with. It emphasized the influencing factors of the allyl group uperplasticizers, such as the mode of feeding, the quality of the materials, the SMAS, the solid content, the numbers of EO, the molar ratio of AA to APEG, and the neutralization degree of acrylic acid. From the fluidity and solidification of the net cement slurry and the concrete to show the differences between the products of the two-step synthesis and the laboratory research’s polycarboxylate superplasticizers, the function of the naphthalene superplasticizer and some other superplasticizer  products were compared.
Keywords: comparative experiment; molar ratio of AA and APEG; EO numbers; cement fluidity

目  录
中文摘要 I
英文摘要 II
目录 III
1. 绪论 1
 1.1  概述 1
 1.2  减水剂的分类 1
 1.3 聚羧酸盐混凝土高效减水剂的研究现状及作用机理 1
 1.4 聚羧酸盐混凝土高效减水剂的制备 3
2. 实验部分 4
 2.1 实验材料  4
     2.2 实验仪器 4
     2.3 实验方法和步骤 4
     2.4 合成工艺流程 5
     2.5 水泥净浆流动度的测试 5
     2.6 高效减水剂含固量的测定 5
3. 结果与讨论 7
 3.1 原料方式的影响    7
 3.2 原料的影响   7
     3.3 链转移剂甲基丙烯基磺酸钠(SMAS)的影响 8
     3.4 含固量的影响 8
     3.5 环氧乙烷数目的影响 9
     3.6 两种原料摩尔比的影响 9
     3.7 pH值的影响 12
     3.8 与萘系减水剂的比较 12
     3.9 与第一代减水剂产品的比较 13
     3.10与其他减水剂产品的比较 14
4.结论与展望 15
致谢 17
参考文献 18

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