Low-temperature anticracking performance testing method and its equipment for building materials

Abstract

This is one test equipment and method using for testing low temperature resist-crack capability to construction material. It relates to circumstance temperature control box, destruction by freezing testing engine and measure-test control system. During the certain temperature dropping process, the displacement sensor with high precision tests the distance between two fix points on the test piece. At the same time, put the norm displacement value tested on the test piece of the displacement test system in advance and dispose it by computer. Control the tension framework of test piece and take it back to the original length. Repeat this test and retain the 'zero displacement control' state, and eliminate the temperature shrinkage error and elasticity distortion error to the test piece holing system and test system to get the 'destruction by freezing critical temperature' of the test under the pure temperature stress factor. The test equipment collocates three refit parts for 'relaxation',' creep' and test, and also carry 'low temperature tension' and 'coefficient of expansion determine' and can be used to test cement concrete and macromolecule composite material.

Description

technical field [0001] The invention belongs to the technical field of building material testing, and relates to a method for testing the low-temperature crack resistance of building materials, in particular to a method for testing the low-temperature crack resistance of asphalt materials. The invention also relates to equipment for realizing the test method. Background technique [0002] In the technical field of building materials, low-temperature cracking of polymer composite materials, cement concrete materials, asphalt concrete panels, and asphalt pavement is a common form of damage to buildings. Before the present invention, due to the lack of methods and corresponding equipment for correctly measuring the low-temperature cracking temperature of materials, indirect reasoning methods such as low-temperature ductility tests and low-temperature tensile tests were generally used to replace them. , can only qualitatively compare the low-temperature crack resistance of mater...

AI Technical Summary

Problems solved by technology

[0003] In view of the problems existing in the above-mentioned prior art, the purpose of the present invention is to change the obvious defects that the indirect reasoning and estimation methods such as low temperature ductility test and tensile test can only be qualitative but not quantitative, and provide a method that can accurately measure low temperature crack resistance. Temperature, to obtain the correct temperature-stress curve and accurate low-temperature cracking temperature, to eliminate the temperature deformation and elastic deformation of the clamped specimen frame to test the low-temperature crack resistance performance, and to provide special low-temperature crack resistance test equipment for implementing this method

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