人工軽量骨材コンクリートの力学的特徴について

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This paper describes the theoretical and experimental studies on the following three items : 1) the measuring methods of mechanical properties of lightweight aggregate embedded in concrete, 2) the effect of aggregate strength on the relationship between the compressive strength and the age of concrete, and 3) the effect of aggregate properties on the fracture process of modelled lightweight aggregate concrete. Main results obtained are summarised as follows : (1) The compressive strength, tensile strength and elastic modulus of lightweight aggregate (10〜15mm in diameter) used in this investigation are about 420kg/(cm)^2, 10kg/(cm)^2 and 1.8×(10)^5kg/(cm)^2, respectively. (2) The compressive strength of lightweight concrete with higher strength of mortar matrix than that of aggregate increases with lower rate than that of normal weight concrete, with the lapse of age. (3) According to the results of finite element analysis, the fracture process of lightweight concrete with lower strength of mortar matrix than that of aggregate is similar to that of normal weight concrete, that is, 1) bond failure at the interface between coarse aggregate and mortar matrix, 2) initiation of tensile crack in mortar matrix and 3) local compressive failure in mortar matrix. On the other hand, the order of fracture of concrete with higher strength of mortar matrix than that of aggregate is as follows : 1) bond failure, 2) tensile cracking in aggregate and mortar matrix and 3) local compressive failure in aggregate. These theoretical results are in good agreement with the test results in the previous papers.
社団法人日本建築学会の論文
1976-02-28

人工軽量骨材コンクリートの力学的特徴について

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