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Method for predicting effective elastic modulus of cement paste

A technology of elastic modulus and cement slurry, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of difficult direct measurement, low efficiency of multi-scale models, poor operability, etc., and achieve good compatibility and high degree of agreement , strong operational effect

Active Publication Date: 2021-03-26
SOUTHEAST UNIV
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Problems solved by technology

However, multi-scale models need to set a large number of parameters when describing from nanoscale to microscale, and some parameters are difficult to measure directly in experiments.
In addition, multi-scale models usually have technical problems such as low efficiency and poor operability

Method used

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  • Method for predicting effective elastic modulus of cement paste
  • Method for predicting effective elastic modulus of cement paste
  • Method for predicting effective elastic modulus of cement paste

Examples

Experimental program
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Effect test

Embodiment 1

[0052] The cement slurry mentioned in the examples of the present invention is prepared by mixing ordinary Portland cement with water. The porous structure of the cured cement paste contains gel pores and capillary pores. Pores in cement paste exhibit complex geometric shapes and random spatial distribution.

[0053] like Figure 1-5 Shown, the present invention predicts the method for cement slurry effective elastic modulus based on CT image, comprises the steps:

[0054] (1) Cement powder and purified water are mixed according to the mass ratio of 5:2, stirred evenly, poured into a cylindrical mold with a diameter of 40 mm and a height of 160 mm for molding, sent to a standard curing room for curing, demoulded after 24 hours, and sent again The standard curing room is maintained for 28 days.

[0055] (2) Remove the cured test piece from the standard curing room, cut it into small cylindrical test pieces with a diameter of 40 mm and a height of 3 mm, then cool it in a liqu...

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Abstract

The invention discloses a method for predicting the effective elastic modulus of cement paste. The method comprises the following steps: (1) forming and maintaining cement paste, and carrying out CT scanning on a maintained sample to obtain a CT image; (2) establishing a mapping relationship between a pixel gray value and an elastic modulus by applying a classical hydration model and a self-consistent theory; (3) according to the mapping relationship obtained in the step (2), converting a gray array of the obtained CT image into a corresponding elastic modulus array; and (4) , solving the effective elasticity modulus of the cement paste from the elasticity modulus array obtained in the step (3) by utilizing a finite element method. According to the method, a cement hydration classical model, a self-consistent theory and a finite element method are utilized, and the theory and a calculation system are mature and complete and high in compatibility, parameter setting is simple, and the operability is high; compared with a predicted value and a measured value of the effective elastic modulus of the cement paste, the matching degree is high; and the method has the characteristic of nondestructive testing, and is suitable for evaluating the service state of the reinforced concrete structure.

Description

technical field [0001] The invention relates to a method for predicting elastic modulus, in particular to a method for predicting effective elastic modulus of cement paste. Background technique [0002] The modulus of elasticity plays an important role in the design and analysis of reinforced concrete structures. The current laboratory testing of elastic modulus, such as ultrasonic method and pulse excitation method, usually consumes too much manpower and material costs, and it is difficult to realize non-destructive testing in actual engineering. More and more researchers are considering the development of cement-based materials micro Structural prediction methods. Generally speaking, traditional forecasting methods can be divided into two categories: analytical methods and numerical methods. The analytical method establishes a reasonable mesomechanical model based on the geometric and physical characteristics of cement-based materials; compared with the analytical method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/046
CPCG01N23/046G01N2223/401G01N2223/421
Inventor 高云
Owner SOUTHEAST UNIV
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