The Application of Construction Wastes and Cold-bonding Technique in Recycling Coarse Aggregates

摘要

This study employs construction wastes as the main materials to develop recycling coarse aggregates, which meet the specifications of green building materials, using the cold-bonding technique instead of sintering method in light of the issues of reduction of waste, energy, and CO2 footprint. Specifically, the cold-bonding technique incorporates the principles of the cement chemistry and composite material to develop recycling coarse aggregates. The results show that the specific gravity (OD) of recycling coarse aggregate is in the range of 1.73 to 1.84; the absorption capacity is in 14.0 to 16.7%; the dry loose density (i.e. unit weight) is 1103 to 1215 kg/m3; the single particle compressive strength at 28-day is in the range of 8.6 to 12.8 MPa; the particle cylindrical crushing strength ranges from 9.3 to 19.4 MPa. The developed cold-bonding recycling coarse aggregate could increase the reuse and recycling of construction wastes, reduce the energy consumption and CO2 footprint, and diminish the impact on the environment and future generations.