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用圓柱体或立方体試件进行劈裂試驗,已逐漸在国內外被采用作測定混凝土杭拉强度的标准方法。我們应用电阻应变仪測定了劈裂試件断裂面上的应变分布,拟对下面的問題提出一点看法:混凝土在拉断的情况下,究竟是由于最大拉应力而破坏(第一强度理論),还是由于最大拉应变而破坏(第二强度理論)?进而探討一下用劈裂法測定混凝土抗拉强度的正确性,以及用劈裂法測定混凝土极限拉伸率的可能性。試驗是如下进行的:試件尺寸采用15×15×4厘米,垫条直徑4毫米,加荷速度每秒10公斤。2
Splitting tests with cylindrical or cubic specimens have gradually been adopted at home and abroad as the standard method for determining the tensile strength of concrete. We used the strain gauge to measure the strain distribution on the fracture surface of the split specimen and proposed to give a little opinion on the following question: If the concrete breaks, it is due to the maximum tensile stress (first strength theory), It is also due to the failure of the maximum tensile strain (the second strength theory) to discuss the correctness of the tensile strength of the concrete measured by the splitting method, and the possibility of determining the ultimate tensile ratio of the concrete by the splitting method. The test was carried out as follows: The test piece size was 15 × 15 × 4 cm, the strip diameter was 4 mm, and the loading rate was 10 kg per second. 2