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Method and device for determining mass bulk modulus of porous materials such as concrete

A technology of bulk modulus and measuring devices, which is applied in the direction of measuring devices, analytical materials, material inspection products, etc., can solve problems such as difficulty in ensuring the accuracy and authenticity of results, and achieve accurate and true measurement results

Active Publication Date: 2017-04-26
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all obtain the matrix bulk modulus through indirect methods, and there is no uniform value for the matrix bulk modulus of concrete and other porous materials, so it is difficult to guarantee the accuracy and authenticity of the results for the calculation of water loads on concrete structures

Method used

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  • Method and device for determining mass bulk modulus of porous materials such as concrete
  • Method and device for determining mass bulk modulus of porous materials such as concrete
  • Method and device for determining mass bulk modulus of porous materials such as concrete

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Embodiment Construction

[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0036] 1. Theoretical basis

[0037] Based on the effective stress method proposed by Biot, the theoretical basis for the experiment is obtained.

[0038] like figure 1 , 2 As shown, the force of porous materials in the water environment can be decomposed into two parts: the pore water pressure with uniform force in all directions (the external is the uniform water pressure p, and the internal is the uniform pore pressure p), and the pore water pressure after deducting the hydrostatic pressure The pressure part, namely:

[0039] σ' ii = σ - p, σ ii = σ' ii + p i = 1, 2, 3

[0040] τ ij = τ' ij i, j=1, 2, 3, i≠j (1)

[0041] ε ii =ε' ii +ε″ ii i=1,2,3

[0042] gamma ij = γ' ij +γ″ ij i, j=1, 2, 3, i≠j (2)

[0043]

[0044]

[0045] where: σ ii , τ ij is the total normal stress and shear stress, p is the pore water p...

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Abstract

The invention discloses a method and a device for determining a mass bulk modulus of porous materials such as concrete. The method includes manufacturing a cubic porous material test piece, pasting strain gauges on six sides of the cubic porous material test piece, connecting the strain gauges to a data acquisition unit through data transmission lines, putting the test piece in a constant-pressure tank full of water, extracting water from a water tank through a water pressure controller to add water pressure on the constant-pressure tank until the water pressure is stabilized as T, recording strain values of the cubic porous material test piece in three directions regularly according to strain data acquired by the strain gauges until the strain values are kept unchanged, adding the strain values in three directions to obtain a strain value sum and a final strain value sum when the strain values are kept unchanged, and computing the mass bulk modulus of the porous material test piece according to the final strain value sum and the water pressure T. The method is capable of determining a numerical value of the mass bulk modulus of the porous materials, is accurate and real in measurement results, and can provide scientific data bases for effective stress studies of hydraulic structure engineering.

Description

technical field [0001] The invention relates to a method and a device for measuring matrix bulk modulus of porous materials such as concrete, and belongs to the technical field of water conservancy and hydropower engineering. Background technique [0002] Concrete structures such as dams often work in water environments, and water pressure is the main load that constitutes the structure. Therefore, for the working environment and load characteristics of concrete structures, it is very necessary to analyze the stress characteristics of concrete under water loads. Due to the chemical reaction during the hardening of concrete, the volume of the cementitious material is deformed, resulting in the formation of a large number of pores. The existence of these pores will have a great influence on the mechanical properties of the concrete structure, resulting in some complex properties of the concrete. Among them, in the calculation of water load, Biot proposed the effective stress ...

Claims

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Application Information

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IPC IPC(8): G01N33/38
CPCG01N33/383
Inventor 张国新雒翔宇
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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