単軸載荷時における軽量骨材コンクリートの骨材粒回りの応力について
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概要
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Experimental and analytical investigations of simplified models of concrete were carried out to study the stress around a lightweight-aggregate located in the concrete subjected to uniaxial short-term compressive stress. The concrete was idealized by a model consisting of a spherical aggregate embedded in a mortar matrix to form a specimen. In the past, Hansen has attempted to explain the complex behavior of the concrete made of lightweight-aggregates with the help of Goodier's formula. His work is notable, but it is a limited case of Goodier's general model which had been introduced in his study on the concentration of stress around spherical and cylindrical inclusions and flaws. The Goodier's analysis may be applied to real materials as a rough estimate, when the mortar (paste, sand, and voids) is treated as a homogeneous elastic matrix surrounding elastic inclusions of coarse aggregates and no interaction among inclusions exists. This approach is somewhat unrealistic. It must be pointed out, however, that the stress-strain curves for lightweight concretes are rather straight compared with those for gravel concretes of the same strength. Under such conditions, failure takes place by splitting the mortar surrounding a weak piece of aggregate. For tractability, the problem has been solved for an elastic inclusion in an infinite space. Several models conformed to Goodier's conditions as much as possible were selected, and the experimental and analytical values were numerically compared in this paper. In the experiments several strain gauges were attached around the perimeter of an aggregate. The observed load-local strain behavior agreed reasonably well with that predicted by Goodier's analysis.
- 社団法人日本材料学会の論文
- 1984-04-15