Establishment method for detecting concrete compressive strength curve by rebound method

Abstract

The invention provides an establishment method for detecting a concrete compressive strength curve by a rebound method, and belongs to the technical field of concrete compressive strength measurement.The establishment method for detecting the concrete compressive strength curve by the rebound method comprises the following steps: S1, test piece selection: selecting a cubic test piece with a standard size; s2, numbering the test pieces: numbering the test pieces to be tested in groups of three by three; s3, marking measuring points: selecting a test surface of the test piece, and marking rebound measuring points; s4, rebound test: testing the rebound value of the test piece by using a rebound device, and determining a rebound representative value R of the test piece; s5, a compressive strength test: testing a compressive strength measured value fcu of the test piece by utilizing a press machine; s6, curve analysis: establishing a scatter diagram according to the rebound value R and thecompressive strength measured value fcu. According to the method, the strength curves are respectively established for the concrete with the strength grades of C20-C45 and C50-C100 so that the application range of the rebound device is expanded, the intersection between specifications and the limitation of instrument use are reduced, and the concrete strength is more convenient and faster to estimate.

Description

technical field [0001] The invention relates to the technical field of concrete compressive strength measurement, in particular to a method for establishing a concrete compressive strength curve detected by a rebound method. Background technique [0002] In the "Technical Regulations for Testing the Strength of High-Strength Concrete" (JGJ / T 294-2013), the concrete strength grade is suitable for C50-C100, and the GHT450 or GHT550 rebound hammer should be used, and this testing technology is suitable for low-strength concrete C20-C45 does not apply. In the "Technical Regulations for Testing the Compressive Strength of Concrete by Rebound Method" (JGJ / T23-2011), the concrete strength grade is applicable to the concrete strength conversion value in the range of 10MPa-60MPa, the strength range is lower, and the strength conversion value is greater than 60MPa. High-strength concrete is not suitable. Therefore, both JGJ / T23 and JGJ / T294 have applicable scope, which makes the hig...

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Problems solved by technology

Therefore, both JGJ / T23 and JGJ / T294 have applicable scope, which makes the high-strength rebound tester unable to be used in the strength detection of low-strength concrete, resulting in the need for high-strength and low-strength concrete strength detection. Different detection techniques are used, so it is necessary to design a reasonable way to apply the high-strength rebound tester to the low-strength part of the concrete to break through the limitation of concrete strength, so as to be used for concrete estimation of various strengths

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