QUANTITATIVE EVALUATION ON THE PARTICLE DISPERSION EFFECT OF A SUPERPLASTICIZER WHEN MIXING TIME IS VARIED

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  • 練混ぜ時における高性能AE減水剤の粒子分散効果に関する定量的評価
  • ネリマゼ ジ ニ オケル コウセイノウ AE ゲンスイザイ ノ リュウシ ブンサン コウカ ニ カンスル テイリョウテキ ヒョウカ

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Abstract

This paper discusses quantitative evaluation of the particle dispersion effect of polycarboxylate-based superplasticizer, varying mixing time, since the particle dispersion effect of the superplasticizer is characterized with the ratio of flow area and funnel speed of the mortar of self-compacted concrete. The particle dispersing effect of the superplasticizer decreased when mixing time is extended in the case of water double mixing. Main reason for this is that specific surface area of cement particles increases as cement hydration is progressed by mixing. The particle dispersion effect of the superplasticizer is in proportion to the adsorption amount of superplasticizer per unit surface area of cement particle, not per unit weight of cement particle. It is able to clearly explain that due to steric hindrance effect polycarboxylate-based superplasticizer exhibits particle dispersing effect even if mixing time is varied.

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