Method for estimating concrete strength of thin-walled structure by using small core sample strength

Abstract

The invention discloses a method for estimating the concrete strength of the thin-walled structure by using the small core sample strength, which belongs to the concrete strength detection of construction projects. The main technical proposal is as follows: a core sample with the diameter of 48mm is drilled from the concrete entity of the thin-walled structure through the cutting and polishing, the compressive strength test is conducted by using an universal material testing machine to obtain a concrete compressive strength value of the small core sample, and the concrete strength of the thin-walled structure is deduced by a correction factor formula. The invention has the advantages of small error and high accuracy, can be applied to the quality control in the construction projects under construction, and the assessment and identification of justice in the existing building and the construction after the disaster.

Description

technical field [0001] The invention belongs to the strength detection of construction engineering concrete, in particular to a method for estimating the strength of thin-walled concrete by using the strength of small core samples. Background technique [0002] Concrete strength is the basic basis for evaluating the quality of construction projects. Under normal circumstances, the concrete structure should follow the requirements of the "Code for Construction and Acceptance of Reinforced Concrete Engineering". When the test results are doubtful, when the concrete quality problems occur due to poor materials, construction or maintenance, when the concrete suffers from freezing damage, fire, chemical erosion or other damage, when it is necessary to test the strength of the building structure or the concrete in the building that has been used for many years), it is necessary to Directly inspect and assess the quality of the component itself, one of the semi-nondestructive test...

AI Technical Summary

Problems solved by technology

However, in the practice of using the core drilling method to measure the strength of concrete, the following problems are often encountered: With the increasing proportion of high-rise and super high-rise buildings,

According to the "Technical Regulations for Testing Concrete Strength by Drilling Core Method", it is difficult to avoid taking steel bars in the core sample, and the influence of steel bars on the compressive strength of the core sample is a complex problem that has not been resolved. Therefore, it greatly affects the drilling core. In addition, some concrete slabs were found to be less than 70mm thick during the test, and the "Technical Regulations for Testing Concrete Strength by Core Drilling Method" uses a drill with a diameter less than 70mm to take out the core for thin-walled components with a thickness less than 70mm There is no provision for evaluating the strength of concrete by samples, which makes it difficult to evaluate the strength of thin-walled members with a thickness less than 70mm in the actual quality inspection work.

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