Abstract
Herein, the size effect of single‐particle crushing of recycled brick and concrete recycled macadam under static load and the fractal characteristics of aggregate under impact load are investigated. The mechanical change law of recycled macadam after compaction crushing under static load is analyzed through single‐particle load crushing and impact crushing tests with different particle groups. Furthermore, the fractal dimension D is introduced to study the effects of impact energy, particle size, and different materials on the fractal characteristics of the recycled macadam. Consequently, the material, shape, and particle size of a single‐particle significantly affect the crushing strength under static loading, and there is an apparent size effect on the crushing strength. Moreover, the proportion of unbroken particles in the overall mass sieve increased with decreasing particle group order under impact loading. The proportion of unbroken particles in the 4.75–9.5‐mm group constituted more than 60% of the total, indicating that its anticrushing ability was significant. In addition, the model relationship between fractal dimension D, nonuniformity coefficient, and curvature coefficient is established. When 1.887 ≤ D ≤ 2.631, the gradation of recycled macadam is superior.
Highlights
IntroductionLarge amounts of construction waste is produced as the byproduct of the building industry (e.g., house repair, demolition, construction, and decoration) with the continuous improvement of living standards and rapid economic advancements and urbanization [1]
In recent years, large amounts of construction waste is produced as the byproduct of the building industry with the continuous improvement of living standards and rapid economic advancements and urbanization [1]
Recycled brick and concrete recycled aggregate with different particle sizes are selected for single-particle breakage testing to comprehensively study the particle crushing characteristics and strength changes of recycled brick and concrete recycled aggregate in this paper. e experiment is performed on the YAW4306 microcomputer controlled electrohydraulic servo universal testing machine of Ningxia University. e maximum measuring range of the instrument is 1000 kN, and the accuracy is 0.01 kN
Summary
Large amounts of construction waste is produced as the byproduct of the building industry (e.g., house repair, demolition, construction, and decoration) with the continuous improvement of living standards and rapid economic advancements and urbanization [1]. Scholars have performed in-depth research on the change of particle gradation in the process of particle breakage and migration. Cai et al [10] investigated the drainage shear test of Advances in Materials Science and Engineering rockfill materials under different gradation, density, and confining pressure using large-scale triaxial apparatus. It is found that the density has minimal influence on the particle size distribution, but different gradation and confining pressure have a significant effect on the particle size distribution. Pei [11] examined the fractal dimension variation of recycled aggregate after impact load test crushing. Dong et al [14] introduced a new method to solve the gradation matrix transfer based on existing research and improved the original gradation transfer matrix by ignoring the particle breakage variation of different particle groups
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