Determinator for thermal expansion coefficients of concrete

Abstract

The invention discloses a determinator for thermal expansion coefficients of concrete. The determinator can be used for determining the thermal expansion coefficients of newly stirred concrete in the whole process from introduction of the concrete into a mould to coagulation and hardening of the concrete. The determinator comprises a movable container structure which is composed of polyformaldehyde plastic slabs and an insulation material, is assembled by four surfaces and facilitates dismounting of a concrete test piece after testing; the six polyformaldehyde plastic slabs, the insulation material and upper and lower aluminum plates form a cuboid enclosed space which is used for accommodating a newly stirred concrete test piece; sides of the upper and lower aluminum plates opposite to the contact sides of the upper and lower aluminum plates and the test piece are all full of semiconductor chilling chips, and metallic cooling fins are used to evacuate heat of the semiconductor chilling chips; the upper and lower aluminum plates and upper and lower plastic slabs respectively form an enclosed cavity which encapsulates the metallic cooling fins; the upper and lower enclosed cavities are connected with a circulating pump through water pipes and are filled with water so as to form water circulation loops; furthermore, a temperature sensor is placed in the concrete test piece to measure the temperature of the concrete test piece, and high precision displacement sensors are installed at the center of the polyformaldehyde plastic slabs and the insulation material at the left and right sides to measure expansion shrinkage deformation of the concrete when the temperature of the concrete changes.

Description

technical field [0001] The invention relates to a testing instrument in the field of building materials, in particular to a testing equipment used for measuring the thermal expansion coefficient of concrete in the whole process from stirring into a mold to setting and hardening. Background technique [0002] The coefficient of thermal expansion of concrete is an important index for studying the development of concrete temperature stress. Using an accurate, reliable and convenient concrete thermal expansion coefficient tester to measure the thermal expansion coefficient is a prerequisite for correct judgment. The concrete thermal expansion coefficient tester of prior art mainly exists following two problems: [0003] One is that the development of the thermal expansion coefficient of concrete cannot be fully simulated: from the stage of concrete entering the mold to the initial setting stage, the previous concrete thermal expansion coefficient tester can only measure the ther...

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Problems solved by technology

[0003] One is that the development of the thermal expansion coefficient of concrete cannot be fully simulated: from the stage of concrete entering the mold to the initial setting stage, the previous concrete thermal expansion coefficient tester can only measure the thermal expansion coefficient of concrete after curing, and the measurement of the concrete thermal expansion coefficient is missing. In the later stage, the development curve of the temperature stress of the concrete cannot be well simulated.

[0004] Second, it is troublesome to disassemble at the end of the test: the existing concrete thermal expansion coefficient tester needs to break the concrete test object in it after the test, so that it can be taken out in pieces. For the cleaning work of the later laboratory, a certain amount of labor cost is added.

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