Method for monitoring pouring compactness of self-compacting concrete in large-scale structural module wall

Abstract

Monitoring on pouring compactness of self-compacting concrete in a large-scale structural module wall of an AP / CAP serial three-generation nuclear power plant is the construction difficult problem which is not completely effectively solved so far and currently, a method for determining compactness of the concrete in a large-scale structural module mainly adopts ultrasonic detection. Experiments prove that an ultrasonic detection result is not ideal very much due to complex structures inside the structural module, such as a shear concrete stud and a section steel, and a heterogenous material forming the concrete. Moreover, ultrasonic detection equipment is large, is difficult to place in a narrow space, is unsuitable to monitor in the construction process and is mostly detected afterwards; if the condition that the concrete is not compact is generated, the rework is difficult. A method disclosed by the invention adopts a mode of detecting a current or a resistance through a closed circuit loop, can monitor the compactness condition and timely rectify in the pouring process and has the advantages of simplicity and sensitivity for operation, accurate result and the like.

Description

Technical field [0001] The invention relates to a method for monitoring the compactness of self-compacting concrete pouring inside a large structural module wall of a nuclear power plant. Background technique [0002] The AP / CAP series pressurized water reactor nuclear power technology is one of the most advanced third-generation nuclear power technologies in the world. Modular construction technology is one of the major features of the AP / CAP nuclear power technology. Modularization can save construction time to the greatest extent. This technology uses a series of large steel structure modules, such as CA01, CA02, CA03, CA04, CA20, etc. The internal structure of this type of steel structure module wall is complex, and the pouring concrete inside the wall is self-compacting concrete, which cannot be vibrated with a vibrating rod. If the method is not properly controlled, the internal concrete will be difficult to compact, mainly in the following four types of parts: 1) The area...

AI Technical Summary

Problems solved by technology

Tests have proved that due to the complex structures such as shear studs and section steel inside the structural module, and the fact that the concrete itself is a heterogeneous material, the results of ultrasonic testing are far from satisfactory

Moreover, the ultrasonic testing equipment is relatively large, and it is difficult to arrange the equipment in a narrow space. It is not suitable for monitoring during the construction process.

Images