THE EFFECT OF SUPERPLASTICIZER PRESENT IN PORE SOLUTION ON FLOWABILITY OF LOW WATER-TO-POWDER CEMENT PASTE

USHIRO Masataka, ATARASHI Daiki, KAWAKAMI Hirokatsu, SAKAI Etsuo

doi:10.14250/cement.67.102

This paper investigates fluidity of low water-to-powder LHC-fused silica paste using different molecular weight superplasticizers. The acid weight％ of superplasticizers is 25％ and the lengths of side chains are 25mols. Each molecular weight of superplasticizer was 10,000, 18,900 and 29,500. At high water-to-powder ratio（W/P＝0.32, 0.24）, it was found that cement particles were dispersed by the steric repulsion of adsorbed superplasticizers on the surface of particles and the cement paste had high fluidity. In the each water-to-powder ratio, cement pastes showed the same apparent viscocity regardless of molecular weight of superplasticizers. On the other hand, it was revealed that the fluidity of low water-to-powder cement paste（W/P＝0.16） improved by both adsorbed superplasticizers on the surface of particles and superplasticizer present in pore solution. <br/>This result suggested that superplasticizers present in pore solution play an important role in improvement of fluidity at low water-to-powder ratio. Further, apparent viscosity of cement paste got lower with the decrease of molecular weight of superplasticizers when sufficient dosage was added to both the surface of particles and pore solution. Based on the above result, at low water-to-powder ratio, the effect on fluidity by superplasticizer present in pore solution is determined by the conformation of superplasticizers and it depends on characteristics of superplasticizers.

THE EFFECT OF SUPERPLASTICIZER PRESENT IN PORE SOLUTION ON FLOWABILITY OF LOW WATER-TO-POWDER CEMENT PASTE

Bibliographic Information

Search this article

Description

Journal

References(1)*help

Keywords

Details 詳細情報について

Export

Report a problem