In view of the complex composition of construction waste and the low quality of traditional recycled aggregate, the project proposes a method for strengthening recycled aggregate, develops environmentally friendly and efficient strengthening technology for recycled aggregate, and uses Class I, Class II and Class III recycled coarse aggregate to replace ordinary aggregate to prepare recycled aggregate. Reclaimed concrete reveals the influence rule of recycled aggregate quality on the performance of recycled concrete, and optimizes the series mix ratio of recycled concrete for concrete curb stones. The properties of recycled concrete kerbs comply with the relevant provisions in "Concrete kerbs"(JC/T 899-2016): the water absorption rate should be less than or equal to 6%; in severe cold areas, all types of kerbs should undergo D50 freeze-thaw cycles. After testing, the mass loss rate should be less than or equal to 3%. When deicing salt is used in winter in severe cold areas, the mass loss rate of various types of curb stones after D28 salt freezing resistance tests should be less than or equal to 1.0 kg/m², the mass loss rate of a single specimen should be less than or equal to 1.5kg/m²。

 (This achievement was released by the Qingdao University Institute Technology Transfer Joint Office)