Research On Stress-strain Curves Of Reactive Powder Concrete Under Uniaxial Compression

The properties of Reactive Powder Concrete under uniaxial compression are the basis physical and mechanical properties, is the essential basis to study bearing capacity and deformation of concrete, is the foundation of material's constitutive model to analysis ultimate load-carrying capacity of members and nonlinear analysis, it can provide the basis mechanical parameters for structural design. However, there is little research on stress-strain curves of Reactive Powder Concrete. For the extension of Reactive Powder Concrete, did some research on stress-strain curves of RPC.In order to obtain the stress-strain curves of Reactive Powder Concrete under uniaxial compression successfully, first analyzed the virtues and defects of the test method that already exist, and found a test method that suits this experiment on the basis of experimental study and data analysis, made the rigid auxiliary frame and the deformation test frame, using the advanced data gathering instrument,finally obtain the stress-strain curves successfully.This article design many mixture proportion according to the variation of water-cement ratio and content of steel fiber, and obtained the Stress-strain curves of them, computed the characteristics of the curves, analyzed the relationships between characteristics and water-cement ratio, summarized the relationship between stress-strain curves of different mixture proportions and water-cement ratio together with content of steel fiber.Fitting rising stages and softening stages of stress-strain curves separately, proposed a mathematical expression that has simple form, obvious physical meaning and utility. Through fitting the test data, the results shows that the mathematical expression can satisfy project precision's request, has come practical value.Obtained stress-strain curves of RPC under cyclic loading, and compared with stress-strain curves under monotonic loading. The results shows that the shape of stress-strain curves under cyclic loading and the stress-strain curves under monotonic loading are similar.