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Tester and testing method for cement-base material cracking and contracting characleristics

A cement-based material, shrinkage performance technology, applied in the direction of measuring devices, analysis materials, material inspection products, etc., can solve the problems that shrinkage performance has not been seen, and there is a gap in cracking performance.

Inactive Publication Date: 2005-07-27
WUHAN UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In fact, the cracking and shrinkage properties of cement-based materials are affected by various restrictive forces in the environment. Therefore, the free-line shrinkage properties usually obtained according to the national standard method cannot be accurately related to the cracking properties concerned by actual engineering. stand up
At the same time, what is tested and calculated according to JC / T453 is only the structural strain performance under the condition of longitudinal limitation, and there is a gap with the cracking performance of cement under the actual application condition
So far, there has been no report on the study of shrinkage properties under the joint constraints of tangential and vertical directions

Method used

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  • Tester and testing method for cement-base material cracking and contracting characleristics
  • Tester and testing method for cement-base material cracking and contracting characleristics
  • Tester and testing method for cement-base material cracking and contracting characleristics

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Embodiment Construction

[0018] 1. Fabrication of testing device for cracking and shrinkage performance of cement-based materials

[0019] The test device for cracking of cement-based materials is attached figure 2 , the diameter of mold A’s restricted inner ring 1 is designed to be 26.65cm, the diameter of detachable outer ring 2 is designed to be 34.65cm, the distance between the inner and outer rings is 4cm, and a side bottom edge is set outside the inner ring An isosceles triangular protruding wedge 5 with a length and a height of 0.3 cm;

[0020] The test circuit is composed of enamelled thin copper wire, power supply, timer and connecting wires. The enamelled copper wire can be thin copper wire in ordinary multi-strand copper core wire;

[0021] The test device for the shrinkage performance of cement-based materials is attached image 3 , the diameter of the limited inner ring 7 of mold B is designed to be 27.65cm, the diameter of the detachable outer ring 8 is designed to be 35.65cm, the dis...

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Abstract

A test method includes forming test sample by model A and detecting out the first cracking time of test sample by detection circuit under constraint state, forming test sample by mode B and detecting out shrinkage property of test sample by measuring calipers under the constrant state, using the wedging on model A to ensure cracking position and utilizing micrometer on calipers to measure out shrinking performance. The device for realizing the method can test both of cracking and shrinking properties at the same time.

Description

technical field [0001] The invention relates to a device and a method for testing shrinkage and cracking performance of cement-based materials under constraint conditions. Background technique [0002] In order to meet the requirements of modern construction, Portland cement has continuously improved its high strength and early strength performance, but the inherent weakness of cement—shrinkage and cracking problems are more serious. Frequent related accidents in engineering, especially shrinkage and cracking problems in major projects, make related research one of the most important topics in the research of cement-based materials. It is of great significance to study the first cracking time and shrinkage performance of cement-based materials in a restrained state to solve the above problems, so a large number of related research methods and test devices have emerged. However, there are relative deficiencies in the existing devices and methods, which are mainly manifested ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00G01N33/38G01R31/00
Inventor 朱洪波马保国董荣珍
Owner WUHAN UNIV OF TECH
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