Abstract
A loading crushing test of recycled mixed coarse aggregates in the same particle diameter range is carried out, and the crushed coarse aggregates are screened, manually sorted, and weighed to study the crushing characteristics of recycled mixed coarse aggregates. The results show that the effect of “reinforcing the strong and discarding the weak” exists between two types of recycled mixed coarse aggregates with different strength in the course of crushing. After crushing, the cumulative mass content under each sieve at all levels and the sieve diameter ratio conform to the geometric fractal characteristics, and the fractal dimension is influenced by the material strength, the initial mixing ratio, and the initial void ratio. On this basis, the fractal dimension of recycled mixed coarse aggregates is determined by the crushing test, and the gradation of recycled mixed coarse aggregates for pavement base or subbase is then determined by fractal dimension. Finally, the mixing amount of recycled clay bricks in recycled mixed coarse aggregates for pavement base or subbase is discussed.
Highlights
Demolition of old buildings in the process of urbanization in China has produced a great deal of construction waste
Landfilling is a common practice for treating demolition construction waste, but it takes up a significant amount of land resources and can cause serious environmental problems. e utilization rate of construction waste in China is about 5%∼10% [1]. e reasons for this situation may be related to the lack of relevant policy guidance, and the difficulty and high cost of treating construction waste make it difficult to form high value-added products
E kinetic mechanism is the same whether large aggregates are crushed into small aggregates or small aggregates are crushed into smaller aggregates. e distribution of the particle size after crushing is fractal, and the characteristics of the ore materials can be measured by the fractal dimension (D)
Summary
Demolition of old buildings in the process of urbanization in China has produced a great deal of construction waste. Mechanical loading (shear or compression) can lead to disaggregation and breakage of particles and alter the particle size distribution of granular materials [30]. E particle size distributions of broken and crushed granular materials tend to be self-similar or fractal [32]. E quasi-fractal dimension tends to a constant value of 2.60 or so [37] Granular materials such as sand, soil, and rock aggregates are ubiquitous. E construction waste recycling mixed aggregate (composed of recycled concrete and recycled clay brick) replaces natural aggregate as pavement base or subbase filling aggregate, which is an effective way to reduce construction waste landfill and realize resource reuse. E particle-size distribution and fractal characteristics of crushed coarse aggregate are studied. In order to shed light on the best usage of recycled clay brick, this paper is expected to provide an effective method for the gradation determination of recycled coarse aggregate used either for pavement base or subbase
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