Hand-shaking type concrete self-constriction measuring device

Abstract

The invention provides a hand-shaking type concrete self-constriction measuring device, relating to a concrete measuring device and solving the problems that the concrete is easily influenced by a template restraining function in a process of measuring the concrete self-constriction by the existing laboratory, the data of a measured constriction value are not real, and an error is generated and the like. One ends of two cylinders are respectively and rotatably mounted in a groove at the upper end of a support; the other ends of the two cylinders are respectively and fixedly connected with two side walls of a frustum-shaped container; the centers of an upper cover and a lower cover are provided with central holes; upper and lower ends of newly-mixed concrete are respectively pre-buried with steel sheets; two sensors are respectively fixedly arranged on the upper cover and the lower cover in a penetrating mode; a sensor is a vortex displacement sensor; the upper part of a hand-shaking handle is uniformly provided with four through holes along a peripheral direction; the hand-shaking handle is fixedly arranged at one ends of the cylinders; and a fixing rod respectively passes through a through hole of the hand-shaking handle and the support. The hand-shaking type concrete self-constriction measuring device disclosed by the invention is suitable for measuring the concrete self-constriction in the laboratory.

Description

technical field [0001] The invention relates to a concrete measuring device, in particular to a hand-operated concrete self-shrinkage measuring device. Background technique [0002] Autogenous shrinkage refers to the reduction of apparent volume or length of cement-based materials under sealed maintenance and isothermal conditions. Chemical shrinkage is the cause of autogenous shrinkage; condensation is a part of autogenous shrinkage, which occurs in the shaping stage; self-drying shrinkage is Part of self-shrinkage, and the most important part. Since it is still difficult to give a clear judgment on the structure formation time of cement paste (the end of the shaping stage), many self-shrinkage tests start from the initial setting, and some start from 1 day after pouring. In the test after initial setting or one day after pouring, the condensation part is ignored, and the results measured at this time greatly affect the accuracy of self-shrinkage. Domestic scholars have p...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the concrete is easily affected by the constraints of the formwork in the process of measuring the self-shrinkage of concrete in the existing laboratory, which leads to the untrue data of the measured shrinkage value and the errors generated, and then provides a hand-operated Concrete autogenous shrinkage measuring device

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