高流動コンクリートのフレッシュ性状の経時変化およびチキソトロピーに関する理論的考察

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This paper deals with the time-dependence of fluidity and thixotropy of high fluidity concrete mixed by adding polycarboxylate-based superplasticizer. With taking both the hydration and the physical flocculation of cement particles into consideration, the increase of apparent viscosity and Bingham's constants with the elasped time of standstill, and the time-dependence of apparent viscosity in agitated state were investigated theoretically. It was concluded that whether the increase of apparent viscosity or Bingham's constants in stationary state or the time-dependent behavior of apparent viscosity in agitated state, are dependent on the hydration rate of cement and are also affected by the dosage of superplasticizer, temperature, the reference time of investigation and the dispersion degree of cement particles at the reference time. Moreover, the influences of the magnitudes of applied stresses and their lasting times on the shape of hysteresis loop of shear strain rate-shear stress relationship and its surrounding area were inquired quantitatively.
社団法人日本建築学会の論文
2002-08-30