Preparation of artificial aggregate using waste concrete powder and CO2 fixed by microorganisms

High carbon emissions, shortages of natural aggregates and environmental pollution waste concrete powder (WCP) have become open issues for the traditional industry. Aggregates prepared by crushing screening usually possess poor mechanical properties. Meanwhile, WCP cannot be effectively utilized. This paper proposes a novel approach based on microorganisms strengthening properties improving CO2 sequestration ‘newly’ artificial cold-bonding pelletization WCP. Specifically, enhanced aggregates, resulting in their apparent density, strength water absorption increasing to 2620 kg/m3, 9.1 MPa 4.8%, respectively. With increase well-crystallized mineralization products, exhibited denser microstructure where porosity decreased from 20.9 13.9%. The fixation increased 7.4 16.0 wt. % due existence microorganisms. compressive indicated that aggregate could partially substitute without affecting its strength, better substitution rate should controlled within 50%. method improves resource utilization emission reduction, showing good potential future applications. Preparation process application.