Method for testing own volume deformation of concrete by adopting flexible corrugated pipe

A volumetric deformation and bellows technology, applied in the direction of mechanical solid deformation measurement, material inspection products, etc., can solve the problems of large measurement error, large influence of gravity and temperature concrete test results, etc., to eliminate the influence of test results and eliminate moisture , the effect of increasing internal constraints

Inactive Publication Date: 2012-10-31
HARBIN INST OF TECH
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  • Summary
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Problems solved by technology

[0004] In order to solve the problems that the mold and test platform of the existing method for measuring the self-shrinkage of concrete cause large measurement errors due to the binding force on the concrete, and the gravity and temperature have a great influence on the test results of the concrete, the invention further proposes a flexible bellows Method for testing the volume deformation of concrete itself

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  • Method for testing own volume deformation of concrete by adopting flexible corrugated pipe
  • Method for testing own volume deformation of concrete by adopting flexible corrugated pipe
  • Method for testing own volume deformation of concrete by adopting flexible corrugated pipe

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specific Embodiment approach 1

[0015] Specific implementation mode one: combine Figure 1 to Figure 3 To illustrate this embodiment, the specific steps of a method of using a flexible bellows to test the volume deformation of concrete itself described in this embodiment are as follows:

[0016] Step 1, prepare the concrete test piece, the concrete test piece is made up of flexible bellows 1, casing 2, pearl cotton layer 3 and concrete 4, the concrete steps of preparing concrete test piece are as follows:

[0017] Step 1 (1), seal one end of the flexible bellows 1 with a tin plate with a thickness of 1 mm and a diameter of 100 mm, and seal the junction between the tin plate and the flexible bellows 1 with glass glue;

[0018] Step 1 (2), set the casing 2 on the flexible bellows 1, and fill the pearl cotton layer 3 between the inner sidewall of the casing 2 and the outer sidewall of the flexible bellows 1;

[0019] Step 1 (3): Pouring concrete 4 into the flexible corrugated pipe 1 in three layers, vibrating ...

specific Embodiment approach 2

[0025] Specific implementation mode two: combination Figure 1 to Figure 3 Describe this embodiment, the flexible bellows 1 in step 1 of a method for testing the volume deformation of concrete itself using a flexible bellows described in this embodiment is a triangular zigzag flexible bellows 1 made of low-density polyethylene plastic, flexible The bellows 1 has a diameter of 100 mm and a length of 400 mm. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0026] Specific implementation mode three: combination Figure 1 to Figure 3 Describe this embodiment, the casing 2 in step 1 of the method for testing the volume deformation of concrete itself described in this embodiment is a casing 2 made of PVC, the diameter of the casing 2 is 110 mm, and the length of the casing 2 is is 400mm. Other components and connections are the same as those in the first embodiment.

[0027] Theoretical Principles of the Invention

[0028] to combine Figure 4 Illustrate the theoretical principle of the present invention, the conversion of volume deformation to length deformation can only be calculated by volume for cement-based materials in the plastic stage, if the shape of the fluid is fixed, the volume of the fluid can be measured by length; the bellows along the axis Compared with the stiffness in the radial direction, the stiffness in the axial direction is negligible, that is, the deformation capacity in the axial direction is much greater...

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Abstract

The invention relates to a method for testing the own volume deformation of concrete, and particularly relates to a method for testing the own volume deformation of concrete by adopting a flexible corrugated pipe. The invention aims to solve the problems that restrictions of a mold and testing platform for the existing method for measuring the self shrinkage amount of concrete result in a big measuring error, and gravity and temperature have a big influence on the concrete testing result. The method provided by the invention comprises the following specific steps: horizontally mounting a prepared concrete sample on a testing jig, and removing a retaining cylinder and a pearl cotton layer; and mounting a digital dial indicator on one end of the sample, continuously reading data from the digital dial indicator, measuring the length of the concrete sample while the figure on the digital dial indicator is read each time, subtracting the previous figure from the figure read on the digital dial indicator each time, and dividing the difference by the length of the concrete sample during reading to obtain the own deformation amount of the concrete sample. The method provided by the invention is used for testing the own volume deformation of concrete.

Description

technical field [0001] The invention relates to a method for testing the volume deformation of concrete itself, in particular to a method for testing the volume deformation of concrete itself by using a flexible bellows. Background technique [0002] The research of high-performance concrete is one of the most popular topics in the international civil engineering field today. Technical measures such as reducing the water-binder ratio, selecting high-quality raw materials, adding a sufficient amount of mineral fine admixtures, and adding admixtures are usually used to obtain good working performance. High-performance concrete with a dense internal structure, but the low water-binder ratio and the large amount of high-activity fine admixtures make the hardening characteristics and internal structure of high-performance concrete very different from traditional ordinary concrete. On the surface of engineering practice, although the total shrinkage is not greater than that of ord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B5/30G01N33/38
Inventor 王宗林李国栋张巍李伟钊
Owner HARBIN INST OF TECH
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