THE MOLECULAR PARAMETERS AND THE EFFECT COMB-TYPE SUPERPLASTICIZERS ON SELF-COMPACTING CONCRETE: A COMPARISON OF COMB-TYPE SUPERPLASTICIZERS ADSORPTION ONTO A BASIC CALCIUM CARBONATE MEDIUM IN THE PRESENCE OF SODIUM SULPHATE
THE MOLECULAR PARAMETERS AND THE EFFECT COMB-TYPE SUPERPLASTICIZERS ON SELF-COMPACTING CONCRETE: A COMPARISON OF COMB-TYPE SUPERPLASTICIZERS ADSORPTION ONTO A BASIC CALCIUM CARBONATE MEDIUM IN THE PRESENCE OF SODIUM SULPHATE
复制标题
DOI：
--
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
C. Comparet;A. Nonat;S. Pourchet;M. Mosquet;P. Maitrasse
中科院分区：
文献类型：
--
作者：
C. Comparet;A. Nonat;S. Pourchet;M. Mosquet;P. Maitrasse
以商品聚甲基丙烯酸和聚环氧乙烷为原料，通过酯化反应合成了几种高效减水剂，合成了梳型聚合物。这些高效减水剂的主链长度相同，但酯比不同，在使用高C3A和可溶碱水泥的自密实混凝土(SCC)中进行了评价。聚合物材料的初始效率(流动值)和羧酸酯比例之间有很强的关系。为了进一步了解这一关系，研究了碱性碳酸钙悬浮液在添加和不添加硫酸钠的情况下的初步吸附等温线。结果表明，随着梳型聚合物酯比的增加，碱性碳酸钙悬浮液的吸附程度降低。结果倾向于显示离子强度的影响，而不是离子影响的影响。
Several superplasticizers were synthesized by an esterification reaction using commercial polymethacrylic acid and polyethylene oxide chains to produce comb-type polymers. These superplasticizers, having the same main chain length but having different ester ratios, were evaluated in self-compacting concrete (SCC) using cement with a high C3Aand soluable alkali content. Thee is a strong relationship between the initial efficiency (flow value) and the carboxylic ester ratio of the polymeric material. In order to further understand this relationship, preliminary adsorption isotherms using a basic calcium carbonate suspension medium in the presence of these polymers, with and without an addition of sodium sulphate were investigated. The results show clearly that the level of adsorption in a basic calcium carbonate suspension medium decreases when the comb-type polymers ester ratio increases. The results tend to show an effect of ionic strength and not an effect of ions influence.