A kind of testing device and method for microscopic compressive strength and elastic modulus of cement stone

Abstract

The invention discloses a test device and method for the microscopic compressive strength and elastic modulus of cement stone, comprising: a working room for carrying various modules, including an operation table, mechanical components and monitoring components; the operation table is used for It is used to drive the movement of the sample in the X direction, the Y direction, the Z direction and the rotation around the Z axis; the mechanical assembly is arranged on one side of the workbench and consists of a vertical column, a horizontal cantilever, a polishing assembly, a cutting assembly and The test assembly is composed of a horizontal cantilever mounted on the top of a vertical column, and a polishing assembly, a cutting assembly and a test assembly are installed on the horizontal cantilever; the monitoring module monitors the preparation and testing process of the sample; the control area is controlled by the main Composed of a console and a display, the control part of the operation console, mechanical components and monitoring components is integrated in the main console, and the display is used to realize human-computer interaction.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a testing device and method for the microscopic compressive strength and elastic modulus of cement stone. Background technique [0002] Generally speaking, the damage of concrete structure is the deterioration process of material from microscopic to macroscopic. There are a large number of initial micro-cracks and voids in the concrete. Under the coupling action of external loads and the environment, the micro-cracks continue to initiate, expand and penetrate, and finally form the rupture of macro-cracks. Furthermore, concrete is a complex heterogeneous multiphase body, and its heterogeneity is manifested on scales ranging from nanometers (nm) to meters (m), which also leads to the mechanical properties of concrete at different scales. There is a clear difference in performance. Therefore, the research on the micromechanical properties of concrete and its fracture mechanism has...

AI Technical Summary

Problems solved by technology

The micro-cantilever beam bending test method that has emerged in recent years has been used to determine the microscopic elastic modulus and flexural strength of cement stone, but the sample preparation process will cause changes in the microstructure of the material, resulting in inaccurate test results

Although the nano-indentation test technology is also used to test the elastic modulus and hardness of cement stone, no research has shown that there is a direct relationship between the indentation hardness of cement-based materials and its compressive strength.

In addition, the above two methods can only obtain the mechanical properties of a certain hydration product in cement stone (in the range of a few microns), but cannot obtain the microscopic mechanical properties of the complex system of hardened cement paste.

[0004] To sum up, the current research on the microscopic pressure resistance of cement stone still lacks a direct, reliable and convenient preparation device and supporting testing methods.

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