コンクリート骨材の実積率の推算に関する実験的研究 (第 1 報) : 骨材の実積率に及ぼす粒度の影響

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  • EXPERIMENTAL STUDY FOR ESTIMATION OF SOLID CONTENT OF CONCRETE AGGREGATES (I) : Effect of Particle Size Distribution on Solid Content of Aggregates
  • コンクリート骨材の実積率の推算に関する実験的研究-1-骨材の実積率に及ぼす粒度の影響
  • コンクリート コツザイ ノ ジッセキリツ ノ スイサン ニ カンスル ジッケン

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Using samples of various different gradings blended with single sized aggregates, sieved sand and gravel with particle sizes of from 0.074 to 19.1mm, an effect of particle size distribution on solid content-packing density-of aggregates by jigging, rodding, and shoveling procedures has been discussed experimentally. It is supposed that the solid content of single sized aggregate corresponds to influence of particle shape on solid content blended in the same packing efforts. The single sized aggsegate is separated at 1/2 size ratio of sieve opening of retained on to passing. In the previous paper, the values of four statistics-Mean, Standard Deviation, Skewness, and Kurtosis-on the fineness modulus scale of continuous distribution of particle size were proposed in order to evaluate numerically the grading of concrete aggregates and named the Grading Parameters on the FM. The solid content of blended aggregates with fairly free grading can be estimated within closely error (≒±1% by vol.) by using these parameters and following equations. D=α(SD-0.29)+Σ^^n__i=1f_i×d_i where α=8.2-(1.2SD+5.4S)/K D : solid content of blended aggregate, % by vol. d_i : solid content of single sized aggregate (size ratio of sieve opening : 1/2), % by vol. f_i : fraction of single sized aggregate, by vol. SD, S, K : standard deviation, skewness, kurtosis of the Grading Parameters based on the FM respectively.

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