Automatic measuring device for volume change of concrete

Abstract

Disclosed is device for measuring the variation of the concrete volume. The device is characterized in that the top point (1-1) of bracket (1) contacts the bottom end surface (2-1) of the balance bar (2) middle part; the weight (6) is jointed on the right end of the balance bar (2); the upper end of the hanger (5) is connected on the left end of the balance bar (2); the concrete sample (8) is equipped with sealing rubber film (4) and set in the hanger (5), and dipped in the liquid 3-1 in the container (3); the base of the pulling sensor (7) is connected on the right end top surface of the bracket (1); the detecting end (7-1) of the pulling sensor (7) is connected on the right end bottom surface of the balance bar (2); the thermometer (9) is dipped in the liquid (3-1).

Description

technical field [0001] The invention relates to the technical field of concrete performance parameter measurement. Background technique [0002] In the process of concrete construction and inspection, the volume change from freshly mixed concrete to hardened concrete is an important parameter related to the mechanical properties and durability of concrete. At present, various expansion agents and shrinkage reducers are widely used in concrete. It is necessary to accurately measure its influence on the volume change of concrete; on the other hand, the influence of various ambient temperatures on the volume change of concrete, such as concrete used at high temperature and concrete used at negative temperature; however, the existing Due to the requirements of measurement accuracy, the experimental device for measuring the early volume change of concrete requires less weight of concrete samples, which will inevitably lead to the increase of its measurement error. Therefore, the...

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Problems solved by technology

[0003] The present invention is to overcome the problem that there is no device that can accurately and automatically and continuously measure the volume change in the process of concrete hardening; and then provides an automatic measurement device for the volume change of concrete; the present invention consists of a support 1, a balance beam 2, a container 3. It is composed of sealing rubber film 4, hanger 5, counterweight weight 6, tension sensor 7, and thermometer 9; the upper apex 1-1 of the support 1 is connected to the lower end surface 2-1 of the middle part of the balance beam 2, and the counterweight The weight 6 is socketed on the right end of the balance beam 2, the upper end of the hanger 5 is connected to the left end of the balance beam 2, the concrete sample 8 is arranged in the sealing rubber membrane 4, and the sealing rubber membrane 4 is arranged in the hanger 5, And the sealing rubber membrane 4 is completely immersed in the liquid 3-1 in the container 3, the sealing rubber membrane 4 and the hanger 5 are not in contact with the inner wall of the container 3, and the base of the tension sensor 7 is connected on the right side of the support 1 On the end face, the detection end 7-1 of the force of the tension sensor 7 is connected to the lower end face on the right side of the balance beam 2, and the temperature measuring end of the thermometer 9 is immersed in the liquid 3-1 in the container 3

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