Tester and testing method for cement-base material cracking and contracting characteristics
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 yet been seen, and there is a gap in cracking performance.
Inactive Publication Date: 2006-11-29
WUHAN UNIV OF TECH
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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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[0018] 1. Production of test equipment for cracking and shrinkage of cement-based materials
[0019] The test device for cracking of cement-based materials is attached figure 2 , The diameter of the restricted inner ring 1 of the mold A is designed to be 26.65cm, the diameter of the removable 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 triangle with a length of 0.3 cm and a height of 0.3 cm protrudes from the point 5;
[0020] The test circuit is composed of thin enameled copper wire, power supply, timer and connecting wire. The enameled copper wire can be thin copper wire among ordinary multi-strand copper core wires;
[0021] The test device for the shrinkage performance of cement-based materials is attached image 3 , The diameter of the restricted inner ring 7 of the mold B is designed to be 27.65cm, the diameter of the removable outer ring 8 is designed to be ...
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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 an application method for testing the shrinkage and cracking performance of cement-based materials under constrained conditions. Background technique [0002] Portland cement has continuously improved its high-strength and early-strength properties to meet the requirements of modern construction, but the inherent weakness of cement-shrinkage and cracking problems are more serious. The frequent occurrence of related accidents in engineering, especially the shrinkage and cracking problems that have occurred many times in major projects, makes relevant research one of the most important topics in the current research on cement-based materials. Research on the first cracking time and shrinkage performance of cement-based materials in a constrained state is of great significance to solve the above problems. Therefore, a large number of related research methods and test devices have appeared. However, the existing devices and...
Claims
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IPC IPC(8): G01N33/38G01N27/00G01R31/00
Inventor 朱洪波马保国董荣珍
Owner WUHAN UNIV OF TECH