Quality properties of self-consolidating concrete mixed with waste concrete powder

This study has been conducted as part of the research project of utilizing waste concrete powder (WCP) created in large quantity during the production of high quality recycled aggregates as a substitute for ordinary Portland cement. The Blaine fineness and the average particle size of WCP used in the study are 1360 cm2/g and 90 μm, respectively. AS the main characteristic of WCP, it is particle were angular similar to cement, and hydrated products were attached on the surface of particles. Although the flowability, segregation resistance ability and filling ability of SCC tend to go beyond the target range with an increase of mixing ratio (0, 15, 30 and 45%) of WCP, improvements have been made with a proper use of GGBF. The compressive strength at 28 days has achieved 30 MPa or more at WCP's mixing ratio of 15% and the splitting tensile strength and elastic moduli have shown similar results to those of previous studies. The drying shrinkage rate and carbonation depth of SCC with WCP in it have seen improvements on quality when used together with GGBF rather than WCP alone.