軽量プレテンけたの載荷試験
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概要
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Recently, artificial lightweight aggregate has often been used in preparation of lightweight concrete for civil engineering structures, particularly as prestressed concrete structures. It is the objects of the present study to examine several behaviors of lightweight concrete girders, in respect of its elastic limit, flexural and shearing strength, and the results of the examination are discussed in comparison with the results of examination made of the behaviors of normal concrete girders. The specimens which are made from normal concrete and three kinds of artificial lightweight concrete, having 0.5 meters height of T-shape section and 8.4 meters length, which are specified in JIS A 5316, are tested under static load to failure with various loading conditions as follows. The flexural test has been carried out by the method according to JIS, having two central loads and 1.0 meter interval, the ages of specimens are 28 days. The shearing test has been carried out by two central objective loads and their situation has been decided according to the ratio of the shear span to the effective depth a/d, such as 2, 3, 4 and 6. The ages of the specimens are 122 to 156 days when the shear loading tests are practiced. The results obtained from these tests are discussed in comparison with those of normal concrete, and the main results are as follows ; (1) The behavior of the flexural crack of the lightweight concrete girders is less than the normal one and its ratio is about 75 percents. (2) The girders with lightweight concrete has almost the same ultimate flexural strength properties as normal concrete girders and may be used with sufficient safety. (3) As to the shearing strength against cracking and breaking, the lightweight concrete girders show about 70 to 80 percent rate of normal concrete girders.
- 社団法人日本材料学会の論文
- 1969-02-15