破碎方式对再生骨料性质及形态特征影响研究

o systematically study the physical properties and morphological characteristics of recycled concrete aggregates from waste concrete, the recycled aggregates produced by two methods, namely jaw crushing and impact crushing, were taken as the research object for testing and analyzing of their physical and technical indicators. The physical technical indicators of these recycled aggregates were tested and analyzed, and digital image technology was used to collect and quantify the geometric shapes of the recycled aggregates. Results show that compared with natural aggregates, recycled concrete aggregates have lower apparent relative density, higher water absorption, higher crushing value, and lower needle like content. The mud content after cleaning can meet the usage requirements.. The water absorption rate and crushing value of recycled concrete aggregates mainly depend on the quantity and strength of mortar attached to its surface, so the changes in water absorption rate and crushing value are consistent with the test results of mortar adhesion rate, and are not significantly affected by the crushing method. However, the crushing method has a significant impact on the apparent relative density. The jaw crusher for small-sized recycled concrete aggregate is better than the impact crusher, while the jaw crusher for large-sized recycled concrete aggregate is worse than the impact crusher. In terms of geometric characteristics, under the influence of construction usage and the secondary crushing process, the needle index value of recycled concrete aggregate shows a downward trend. Meanwhile, the roundness value and equivalent elliptical circumference decrease, indicating that the content of needle-like particles in it reduces and its angularity becomes less pronounced.Therefore, it is necessary to improve its roundness value through shaping technology. Overall, the geometric characteristics of the recycled concrete aggregate particles produced by the impact crusher are better than those produced by the jaw crusher. These conclusions can provide reference for optimizing the performance of recycled concrete aggregates through crushing processes and evaluating their morphological characteristics.