フライアッシュ・セメントの膨張収縮について

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タイトル別名
  • ON THE VOLUME CHANGE OF FLY ASH MIXED CEMENT
  • フライアッシュ セメント ノ ボウチョウ シュウシュク ニ ツイテ

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The author studied the drying shrinkage of specimens at constant relative humidity of 44% about several kinds of cement. As a result comparing the drying shrinkage of fly ash mixed portland cement (mixing proportion by weight P.C.: F.A.=80:20) with those of normal portland cement, high early strength portland cement, moderate heat portland cement, natural pozzolana cement, slag cement, the volume change of the fly ash cement has been found always the smallest.<br>The author also tested the differences of cracking tendency by so-called ring test, comparing with the portland cement types I, II, III and those cements in which 20% or 30% fly ash was mixed in each of I, II, III type portland cements. It was observed that type II cement mixed with 30% fly ash showed the smallest tendency of crack corresponding to the least values of shrinkage and modulus of elasticity.

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