振动压实作用下建筑垃圾颗粒破碎规律研究
Study on the Fragmentation Law of Construction Waste Particles under Vibration Compaction

为了验证振动压实作用下，不同建筑垃圾颗粒(废旧混凝土块和废旧砖块)的破碎规律，采用5种配比方案，对振动压实前后的级配及颗粒破碎规律进行分析。结果表明：当建筑垃圾中混凝土粗粒占主导地位(废旧混凝土含量 > 70%)，振动压实前后级配变化较小，不易破碎，破碎颗粒中，主要由40~60 mm粒组破碎为20~40 mm和5~10 mm粒组；建筑垃圾中砖块占主导地位(废旧混凝土含量 < 30%)，振动压实前后级配变化较大，强度较低，易破碎成细颗粒，破碎颗粒中，主要由40~60 mm粒组破碎为5~10 mm粒组；当30% < 废旧混凝土含量 < 70%时，混合料骨架是由粗粒和细粒共同作用，在振动压实的过程中，粗颗粒和细颗粒相互嵌挤，可减少颗粒的破碎。
In order to verify the fragmentation patterns of different construction waste particles (waste concrete and waste bricks) under vibration compaction, five proportioning schemes were used to analyze the gradation and particle fragmentation patterns before and after vibration compaction. The results showed that when the coarse concrete particles dominated the construction waste (waste concrete content > 70%), the gradation change before and after vibration compaction was small and not easy to crush. Among the fragmented particles, the 40~60 mm particle group was mainly broken into 20~40 mm and 5~10 mm particle groups; bricks dominate in construction waste (waste concrete content < 30%), with significant changes in grading before and after vibration compaction, low strength, and easy breakage into fine particles. Among the broken particles, the 40~60 mm particle group is mainly broken into the 5~10 mm particle group; when the content of waste concrete is between 30% and 70%, the mixture skeleton is formed by the combined action of coarse and fine particles. During the vibration compaction process, the coarse and fine particles are interlocked, which can reduce particle breakage.