Apparatus for automatically and continuously recording early volume change of concrete, and measuring method thereof

Abstract

A device and a measuring method which can automatically and continuously record the early volume change of concrete relate to a device and a measuring method for measuring the volume change of the concrete. The invention solves the problems of the large result error and being incapable of continuing day and night in the manual observation in the method by adopting the liquid height change to measure the early volume change of the concrete. The lower end of a thin tube (2) is vertically inserted into a closed container (1); the lower end surface of the thin tube (2) is arranged below the liquid level of a conductive liquid (6); two resistance wires (4) are respectively and symmetrically stuck on the outer surface of a glass stick (3) along the length direction of the glass stick (3); the upper ends of the resistance wires (4) are respectively connected with the two post heads of a reading instrument (5). The method includes: sealing and packaging a sample, arranging the sample into the closed container, injecting the conductive liquid into the closed container and reading a numerical value. The method of the invention is simple; the measured data is accurate; the method can provide more accurate data for the early volume change of the concrete.

Description

technical field [0001] The invention relates to a device and a measuring method for measuring the volume change of concrete. Background technique [0002] As my country's civil engineering enters a period of large-scale construction, the phenomenon of cracking occurs frequently due to the early shrinkage of concrete. The early spontaneous shrinkage of high-strength concrete with a low water-binder ratio is one of the important reasons for concrete cracking. However, the existing method for measuring the early volume change of concrete usually adopts the buoyancy method, the non-contact measurement method, and the liquid level height change method. The liquid level change method is to manually observe the early volume change of concrete in the container. This method is labor-intensive, and the error of manual observation is large, especially at night. Observation is more difficult, so it is difficult to accurately evaluate the early spontaneous shrinkage of concrete. Conten...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the manual observation of the early volume change of concrete in the liquid level change method has large measurement error and time-consuming, especially nighttime observation is more difficult, and it is difficult to accurately evaluate the early autogenous shrinkage of concrete, the present invention further provides a method. A device and measurement method for automatically and continuously recording early volume changes of concrete

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