コンクリート引張強度試験法に関する基礎的研究(II) : 貫入引張強度試験法

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This paper describes the test procedures and formula to be used for determination of tensile strength of concrete by unconfined penetration method. In this test, a cylindrical specimen of concrete is placed vertically between the loading plates of the test machine and compressed by two conic steel punches located concentrically on the conic cavities on the top and bottom surface of the cylindrical specimen. The specimen splites across the virtical diametric plane in exactly similar to that observed in a spliting tensile strength test. The formula is derived by employing the upper-bound theorem of limit analysis of perfect plasticity. The values of tensile strength computed from the results of a number of unconfined penetration tests have been compared with the spliting tensile strength tests for the same cylindrical specimens. Almost good agreement between both test results has been observed, and the values obtained from unconfined penetration tensile strength test are a little greater than the values of the another test.
1985-01-31