Aggregate elasticity modulus detection method and application

Abstract

The invention discloses an aggregate elasticity modulus detection method and application. The detection method comprises the following steps: measuring the volume of aggregate, pouring the aggregate and a cementing agent, and curing to obtain a test piece; measuring the propagation velocity of the ultrasonic wave in the test piece by adopting an opposite measurement method, and processing data toobtain the longitudinal wave velocity of the ultrasonic wave in the test piece; calculating the elasticity modulus, the bulk modulus and the shear modulus of the test piece and the bulk modulus and the shear modulus of the cementing agent according to the longitudinal wave velocity; calculating the bulk modulus and the shear modulus of the aggregate according to a micromechanics formula; and calculating the elasticity modulus and Poisson's ratio of the aggregate according to the bulk modulus and shear modulus of the aggregate. The detection method provided by the invention is wide in application range and high in accuracy. The aggregate elasticity modulus and Poisson's ratio obtained through detection can be used for calculating the wave velocity of ultrasonic waves in concrete made of aggregate, predicting the performance of the concrete and improving the accuracy of safety evaluation and durability evaluation of a reinforced concrete structure.

Description

technical field [0001] The invention relates to the field of detection of building materials, in particular to a detection method for the modulus of elasticity of aggregates in concrete materials. Background technique [0002] Reinforced concrete structure is the most commonly used and most important structure in today's building structure. The concrete material is generally composed of water, coarse aggregate, fine aggregate and cementitious material. According to the different proportions of each component, the performance of the poured concrete material also has different big difference. At the same time, concrete components usually have some defects and damages during construction and use, including macroscopic defects such as concrete holes or honeycombs, and concrete due to early unstressed deformation, long-term service under corrosion conditions or freeze-thaw environments, etc. The problem creates microscopic cracks. These defects and damage will reduce the bearin...

AI Technical Summary

Problems solved by technology

[0008] 1. At present, the parameters required for the determination of ultrasonic velocity are still mainly based on existing empirical formulas;

[0009] 2. It is difficult for ordinary ultrasonic instruments to measure the ultrasonic velocity in aggregates for granular aggregates;

[0010] 3. The elastic parameters of the same aggregate will have certain differences due to factors such as shape and particle size

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