Method for measuring concrete setting time based on strain time on-line measuring

Abstract

The invention discloses a method for measuring the solidification time of concrete based on the online measurement of the strain temperature, which includes fixing a sensor in the concrete formwork to be measured in advance, setting the measurement parameters and starting the automatic measurement before the concrete is poured, and during the solidification process of the concrete The strain and temperature are measured online to obtain the total strain of the measured concrete with time variation curve dεvt / dt~t and the temperature variation curve of the measured concrete with time αcd(ΔT) / dt~t. One time point is the setting time of concrete. Because the thermal expansion strain rate of concrete and the strain rate measured by the vibrating wire begin to overlap, the result measured by the vibrating wire obeys the strain rate of the concrete, which means that the stiffness of the concrete is much greater than that of the steel sleeve, so the present invention can directly reflect the stiffness of the concrete , and at the same time, the invention can monitor large-scale concrete projects on-line, and can be used to quantitatively measure the solidification time of cement concrete after pouring and monitor whether the concrete is solidified.

Description

technical field [0001] The invention relates to civil engineering, in particular to a measurement method for on-line measuring the solidification of cement concrete after pouring or judging whether the concrete is solidified based on the strain temperature. Background technique [0002] Cement concrete has been widely used in civil engineering. Concrete monitors the solidification process of concrete or determines the solidification time of concrete. It is useful for understanding various properties of concrete such as tensile, compressive and shear strength, anti-leakage, and elastic properties. Accurate measurement Concrete shrinkage and creep, it is very important to determine whether the concrete can bear the load. It is of great significance especially for the engineering construction control of large concrete structures (bridges, etc.). Shrinkage and deformation, so it is very difficult to make an accurate analysis of the loading of the concrete structure to determine...

AI Technical Summary

Problems solved by technology

[0006] Due to the existence of different definitions of concrete solidification in the above methods, the measured concrete solidification time is also quite different.

In addition, the existing methods are generally difficult to measure the on-site solidification process of the constructed concrete

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