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用原始强度等级C35的废弃混凝土,经破碎、筛分、搭配后所得Ф5mm～16mm连续级配再生粗集料,对其粒径分布、形状和表面特征、表观密度,以及堆积密度、吸水率、压碎指标、坚固性、针片状含量、含泥量等性能进行了全面测试,并与相同级配的天然粗集料进行对比。设计适合于生产装饰混凝土砌块的C30低流动性干硬性混凝土,并就再生粗集料以不同比例等量取代天然粗集料后,混凝土的用水量、抗压强度、弹性模量和收缩率等进行试验和比较。
With the original strength grade C35 abandoned concrete, crushed, sieved, with the resulting Ф5mm ~ 16mm continuous graded regeneration of coarse aggregate, its particle size distribution, shape and surface characteristics, apparent density, and bulk density, water absorption , Crushing index, sturdiness, needle flake content, clay content and other properties of a comprehensive test, and with the same level of natural coarse aggregate comparison. The design of C30 low-flow dry-hard concrete suitable for the production of decorative concrete blocks and the calculation of the water consumption, compressive strength, modulus of elasticity and shrinkage of the concrete after replacing the natural coarse aggregate with different proportions of recycled coarse aggregate Etc. for testing and comparison.