Plasticizing Characteristics of Sulfonic Acid Polymer Containing Methacrylic Acid Derivatives

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Title: Plasticizing Characteristics of Sulfonic Acid Polymer Containing Methacrylic Acid Derivatives

Author(s): E. I. Tazawa, A. Yonekura, M. Takahashi, S. Miyazawa, and K. Kawai

Publication: Special Publication

Volume: 148

Issue:

Appears on pages(s): 367-384

Keywords: bleeding (concrete); concretes; fly ash; fresh concretes; plasticizers; plastics, polymers, and resins; setting (hardening); silica fume; slags; slump; superplasticizers; Materials Research

Date: 9/1/1994

Abstract:
Various types of superplasticizer that maintain concrete slump for longer periods have been extensively investigated. A new type of superplasticizer with high-range water-reducing slump-maintaining capacities, composed of sulfonic acid polymer with methacrylic acid derivatives, has recently been developed. In this study, influence of cement type, concrete temperature, and pozzolans on properties of fresh and hardened concrete with this type of superplasticizer was investigated. Two reference superplasticizers were widely used naphthalene-based and amino sulfonic acid-based. A significant increase in water-reducing capacity to obtain the same consistency was observed at a much lower dosage. Absolute value of zeta potential of cement particles with the superplasticizer increased with elapsed time until 90 min after mixing, which explains the high-slump-retention capacity of the concrete. Plasticizing effects of superplasticizers were more pronounced for concretes with fly ash or blast furnace slag as blending agents. Concrete bleeding decreased slightly. Properties of hardened concrete, such as compressive strength and drying shrinkage, were at nearly the same level as those of concrete with naphthalene-based superplasticizer.