On-site measuring device for concrete strength

Abstract

The invention discloses an on-site measuring device for concrete strength. The device comprises a support plate; the support plate is provided with a device fixing unit and a driving loading unit for transmitting power to a shear unit; the driving loading unit is connected with the shear unit with a shear head for cutting the concrete; the shear head of the shear unit is inserted into the device fixing unit; and the shear unit is connected with a load sensor. Compared with the prior art, the device does not require a test block chiseled from a concrete region to be tested; the device fixing unit is directly fixed to the surface of the concrete to be tested; the bottom of the shear unit is inserted into the device fixing unit, so that the bottom of the shear unit contacts with the concrete to be tested; the driving loading unit drives the shear unit to directly conduct shear measurement on the concrete to be tested at the scene; and the load sensor calculates the shear strength to evaluate strength grade of the concrete. The device can be directly fixed to the surface of the concrete region to be tested, and is easy for measurement.

Description

technical field [0001] The invention belongs to the technical field of on-site detection of concrete strength in engineering, and relates to an on-site measurement device for concrete strength. Background technique [0002] The evaluation of concrete quality is usually to make standard concrete test blocks by sampling during construction, and carry out compression test after 28 days of curing, and measure its compressive strength as an index for evaluating concrete quality. This evaluation method does not take into account the quality differences caused by a series of operations including transportation, pouring, and maintenance, as well as the environmental conditions such as the ambient temperature and humidity of the on-site concrete components and the laboratory test blocks. The measured concrete strength does not accurately reflect the actual strength of the concrete on site. Therefore, it is very necessary to detect the strength of concrete on site. At present, the r...

AI Technical Summary

Problems solved by technology

The basis of "the rebound method is used to detect the strength of concrete" is that the compressive strength of concrete is related to the hardness of concrete, but for complex multi-phase heterogeneous materials such as concrete, the rebound value and compressive strength There is no unique relationship between them. The rebound method only provides the surface strength value of the concrete, and is affected by the carbonization of the concrete surface and the dry-wet state, so the test error is relatively large; the ultrasonic rebound comprehensive method is affected by the concrete density, raw material mix ratio and Due to the influence of steel bars, the measurement accuracy is often not ideal, and the component is required to have a relative test surface during the test, and there are many auxiliary work on site

The core drilling method is widely used in concrete strength testing due to its intuitive and reliable characteristics. However, there are many problems in the practical application of the core drilling method. In addition to causing local damage to the structural concrete and high testing costs , the standard test block made by sampling will also be affected by the local quality of the concrete, which makes the strength of the test block different from the strength of the actual structural concrete, and the test of the standard test block needs to be carried out in the laboratory, and the laboratory Differences from on-site environmental conditions can also cause measurement errors

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