磺酸基外加剂特性对水泥颗粒间相互作用力及水泥浆体流动性的影响

H. Uchikawa, S. Hanehara
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引用次数: 5

摘要

研究了木质素磺酸基掺合料(LS)、氨基苯磺酸基掺合料(AS)和三聚氰胺磺酸基掺合料(MS)在W/C比为0.3时制备的水泥浆体的吸附量、水泥颗粒与水泥颗粒之间的相互作用力和水泥颗粒的ζ电位之间的关系。旨在为阐明磺酸基有机外加剂性能对混凝土流动性的影响提供基础数据。水泥颗粒对磺酸基外加剂的吸附量与外加剂的分子量成对数关系。分子量越小,吸附量越大。水泥浆体中水泥颗粒的zeta电位取决于外加剂中磺酸基的含量和外加剂的吸附状态。水泥颗粒间的相互作用力与水泥浆体的流动性呈线性相关。即使在加入磺酸基外加剂时,位阻排斥力也对颗粒的分散起着很大的作用,迄今为止认为磺酸基外加剂主要是通过静电排斥力来分散颗粒。除AS外,其空间排斥力与磺酸基混合物的分子量有关。静电斥力占相互作用力的总斥力的贡献率与外加剂中磺酸基的含量有关。AS的作用之所以不同于其他混合物,可能是因为AS的吸附状态不同于其他混合物。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of Characteristics of Sulfonic Acid-Based Admixture on Interactive Force Between Cement Particles and Fluidity of Cement Paste
The relationship among the amounts of adsorption admixtures to cement particles, the interactive force between cement particles and the zeta potential of cement particle and fluidity of cement paste prepared at the W/C ratio of 0.3 with lignin sulfonic acid-based admixture (LS), aminobenzene sulfonic acid-based admixture (AS) or melmine sulfonic acid-based admixture (MS) was studied in this paper, aiming at obtaining the basic data for elucidating the effects of the characters of sulfonic acid-based organic admixtures on the fluidity of concrete. The amount of adsorption of the sulfonic acid-based admixture by cement particles are logarithmically related to the molecular weight of the admixtures. The lower the molecular weight, the more the amount adsorbed are. The zeta potential of cement particle in cement paste depends upon the content of sulfonate group in the admixture and the adsorption state of admixture. The interactive force between cement particles are linearly related to the fluidity of cement paste. The steric repulsive force considerably contributes to the dispersion of particles even in the addition of sulfonic acid-based admixture which has been considered so far to disperse the particles mainly by the electrostatic repulsive factor. The steric repulsive force is related to the molecular weight of the sulfonic acid-based admixture except AS. The rate of contribution of electrostatic repulsive force to the total repulsive force accounting for the interactive force correlates with the content of sulfonate group in the admixture. The reason why the action of AS is different from those other mixtures is probably because the adsorption state of AS is different than those from others.
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