Method for counting early-stage macroscopic elasticity modulus of cement paste under axle center stress state

A technology of cement slurry and stress state, applied in the direction of measuring devices, strength characteristics, instruments, etc., can solve the problem of less application of finite element theory

Active Publication Date: 2013-12-11
JINLING INST OF TECH
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Problems solved by technology

However, another commonly used analysis method—the finite element theory ...

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  • Method for counting early-stage macroscopic elasticity modulus of cement paste under axle center stress state
  • Method for counting early-stage macroscopic elasticity modulus of cement paste under axle center stress state
  • Method for counting early-stage macroscopic elasticity modulus of cement paste under axle center stress state

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Embodiment Construction

[0054] The present invention proposes a method for calculating the early macroscopic elastic modulus of cement paste under axial stress state by discussing the research of finite element method in the field of early macro performance prediction of cement-based materials. The main step flow chart of the present invention is as figure 2 Shown, the specific implementation method of the present invention is illustrated below in conjunction with the accompanying drawings:

[0055] Step 1, input the calculation start time, end time and calculation step size, the total number of calculations n=(end time-start time) / calculation step size;

[0056] Step 2: Input the microscopic model of the cement slurry at the current moment in the first calculation step. In the model, each unit has been divided into low-density C-S-H unit, high-density C-S-H unit, CH unit, calcium sulfoaluminate hydrate unit, capillary pore unit, Free water unit and unhydrated cement particle unit;

[0057] Step 3...

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Abstract

The invention provides a method for counting an early-stage macroscopic elasticity modulus of cement paste under an axle center stress state and particularly provides a finite element analysis method which is intuitional in concept, is easy to handle and use and is used for counting the early-stage macroscopic elasticity modulus of the cement paste under the axle center stress state on the basis of properties of known cement paste micro models and various hydrate materials. According to the method, the average strain of each unit of the micro models under the axle center stress state is counted by virtue of a finite element emulation technique on the basis of the properties of the known cement paste micro models and the various hydrate materials, and in combination of an elasticity modulus basic definition, the average elasticity modulus of the cement paste micro models is counted, thus realizing combined innovation and expansion application of a micromechanic theory and a finite element technique of cement-based materials. According to the method, a development law of the early-stage macroscopic elasticity modulus of the cement paste can be obtained, and a foundation is laid for analyzing the influences of composition, distribution, porosity and pore size distribution of a cement hydration product to the macroscopic elasticity modulus of the cement paste. The method is simple in algorithm and clear in concept, and can be easily handled and extended by a user.

Description

technical field [0001] The invention belongs to the technical field of early-stage mechanical performance simulation of cement-based materials, and specifically relates to an early-stage macro elastic modulus calculation method based on the microscopic model of cement paste and finite element simulation technology. Background technique [0002] Studies have shown that the microstructure of cement-based materials plays a decisive role in its macroscopic behavior. For a certain cement-based material, the development of its macroscopic properties such as strength, elastic modulus, and thermal conductivity is closely related to its internal microstructure. Therefore, only by understanding the essence of cement-based materials, and understanding the composition and distribution of the internal microstructure of the material in the process of cement hydration and a complete set of knowledge systems such as its effect on macroscopic properties, can we control the performance of ceme...

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Application Information

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IPC IPC(8): G01N3/00
Inventor 王潘绣赵海涛宣卫红
Owner JINLING INST OF TECH
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