Abstract

In this paper, the formula of a three-point bending (TPB) test by use of short cylinder typed specimen is proposed to evaluate the flexural strength of rock or concrete, the strength of bedding plane of sedimentary rock and construction joint of concrete. Firstly, the stress distribution within cylinders with various lengths is analyzed by the three dimensional Finite Element Method. Then the formula is suggested based on the analyzed results for the four-point bending (FPB) test of ASTM, JIS and the three-point bending (TPB) test. The specimen with 5–10cm in diameter and 10–20cm in length is used in the TPB test. This dimension is that used in uniaxial compression test of concrete or rock drilled core. Secondly, a series of the TPB and FPB test is performed by the use of granite specimen with various lengths, then it is shown that the flexural strength is evaluated by the suggested formula and compared with that by the conventional one. Finally, it is made clear that the suggested bending test by use of the cylinder typed specimen is available for evaluating the flexural strength of concrete and rock easily.

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