セメント・ペーストの初期沈下 (第1報) : 混合時間を変えた場合

概要

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……The settling phenomenon takes place, when fresh concrete is still placed. This settling will affect the strength and the volume changes of the hardened concrete.In the present paper, the effect of the mixing time on the settling of cement paste is reported. The settling of paste was measured with a sedimentation volume of the cement suspension. The results show that the mixing time largely influences the settling of the cement paste. The longer the mixing time is, the more compact the structure is, but when the mixing time is over 1 hr., the structure becomes rather loosely. The strength and other physical properties of the hardened paste have a close relationship with the sedimentation volume (structure of settling) of the paste.It seems that the settling of the paste would be explained by the degree of coagulation of the cement particles, which is dependent on a large number of factors, e.g. mixing time, fineness, chemical composition, SO3 content, addition agents, etc.
社団法人日本セラミックス協会の論文