Strength and Acoustic Emission Damage Characteristics of Tailing Sand Modified Concrete

Abstract

Abstract: In order to study the compression damage characteristics of tailing sand modified concrete, uniaxial compression-acoustic emission monitoring tests were carried out on four groups of concrete with different replacement rates of phosphate tailing sand. According to the acoustic emission (AE) signal released by the concrete under compression, the damage degree of the material was quantitatively discussed, and the evolution characteristics of the concrete damage were analyzed based on the AE index. The results show that the stress-strain curve of concrete is divided into four deformation stages: elastic deformation, plastic deformation, fracture failure and residual deformation. With the increase of the content of tailing sand, the compressive strength of concrete increases first and then becomes stable. The peak compressive strength of concrete with tailing replacement rate of 30% (mass fraction) is the highest. Damage factors were obtained from AE signals, and the damage factor-strain curves show that the damage of ordinary concrete structure is mainly in the plastic deformation stage, while the structural damage of tailing sand modified concrete is concentrated in the fracture failure stage. A certain proportion of phosphate tailing sand helps to improve the compactness of cement mortar, thus enhancing the compressive strength and deformation properties. The research results provides an important reference for the modification of concrete with tailing sand.

Key words: concrete, tailing sand, stress-strain, damage characteristic, acoustic emission

CLC Number:

TU528

WANG Wenjie, MO Jiyun. Strength and Acoustic Emission Damage Characteristics of Tailing Sand Modified Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3450-3456.

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