为了防治混凝土发生裂缝,许多坝工等大体积混凝土在设计中提出抗裂要求,以极限拉伸值作为混凝土抗裂能力的指标。本文讨论了影响混凝土极限拉伸值的测试方法、影响因素及提高措施。可以选用掺掺合料、外加剂、纤维和石粉的方法来提高混凝土的极限拉伸值,从而提高混凝土抗裂性能。为工程实践提供参考。 In order to prevent the occurrence of concrete cracks, many dam and other mass concrete in the design of crack resistance requirements, the ultimate tensile value as an index of concrete crack resistance. This article discusses the test methods, influencing factors and improving measures that affect the ultimate tensile value of concrete. Can choose to admixture, admixture, fiber and stone powder method to improve the ultimate tensile value of concrete, thereby enhancing the crack resistance of concrete. Provide a reference for engineering practice.