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近几年来,我们对水泥强度测定方法进行了较系统的研究。现根据研究结果,对水泥强度测定方法扼要地提出如下一些看法。一、用劈裂抗拉强度试验法代替8字型法目前,世界各国的硬练法一般都用8字型法测定水泥的抗拉强度,但由于8字型试锭断面骤然变化,会造成应力局部集中,在最狭窄断面的两侧所受应力,约等于该断面平均应力的1.5~1.7倍。因此,由8字型轴心受拉方法所测得的抗拉强度,比水泥突际的抗拉强度低得多。另外,由于8字型试锭形状很不规则,如模型和抗拉试验机的夹具制作不准确,或试
In recent years, we have conducted a systematic study of cement strength measurement methods. Based on the results of the study, some of the following observations have been made on the determination of cement strength. First, the use of splitting tensile strength test method instead of the figure eight method At present, the hard training methods in the world are generally used to determine the tensile strength of the cement, but due to sudden changes in the cross section of the eight-shaped test stick, will cause The stress is locally concentrated, and the stress on both sides of the narrowest section is approximately 1.5 to 1.7 times the average stress of the section. Therefore, the tensile strength measured by the 8-shaped axial stress method is much lower than the cement tensile strength. In addition, due to the irregular shape of the 8-shaped test-tubes, the fixtures of the model and tensile tester are inaccurately produced or tested.