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混凝土在龄期12 h~2 d表现出明显的塑性,为了避免受力后引起较大的侧向位移,采用一种无损检测方法——冲击共振法,可以快速准确地测出混凝土早龄期动态弹性模量,并通过它与静力受压弹性模量的线性关系推算出静力受压弹性模量。试验研究骨料体积含量、粗骨料级配、粗骨料种类、水灰比和养护温度对混凝土轴心抗压强度和弹性模量的影响,进一步分析在相同龄期时,哪些因素是重要因素。研究得出水灰比是轴心抗压强度的重要影响因素,骨料体积含量是弹性模量的重要影响因素。同时,采用多元回归分析建立上述影响因素与强度和弹性模量相关关系的数学表达式。
In the age of 12 h ~ 2 d, the concrete showed obvious plasticity. In order to avoid the large lateral displacement caused by the force, a non-destructive testing method, impact resonance method, can be used to quickly and accurately measure the concrete age Dynamic elastic modulus, and through its linear relationship with the static compression elastic modulus of the static compression modulus of elasticity. The effects of aggregate volume, coarse aggregate gradation, coarse aggregate type, water-cement ratio and curing temperature on the compressive strength and elastic modulus of concrete were investigated experimentally to further analyze which factors are important at the same age factor. The results show that the water-cement ratio is an important factor affecting the compressive strength of the axial center, and the aggregate volume content is an important factor affecting the elastic modulus. At the same time, using multiple regression analysis to establish the mathematical expression of the above-mentioned factors and the relationship between strength and elastic modulus.