Development of high strength recycled aggregate concrete-composite effects of fly ash, silica fume and rice husk ash as pozzolans

Abstract The world today has started facing bigger problems related to the concrete industry, especially with becoming most extensively used construction material in world. At a time like this, where more eco-friendly substitutions are stringent, it calls for comprehensive approach producing recycled from aggregates (RCA). This study is an extension previous studies involving composite utilization of pozzolans treating RCA. It investigates on possibility using rice husk ash (RHA) along other as cement replacement, both stages aggregate treatment and production. was observed that through this treatment, specific gravity increased value 2.37 which earlier 2.18 untreated RCA, 26% 59% reductions were obtained water absorption porosity aggregates, respectively. Further contained RHA stages, attained high strength 55.4 MPa, even surpassing control mix containing natural aggregates. same resulted 12% increase its surface resistivity. Rapid Chloride Permeability Test (RCPT) permeability results also showed substantial improvements when compared reference RCA mix. Similar use pozzolans, microstructure amelioration mechanical durability properties concrete. evidently indicates achieving strengths, derived parent concretes lower grades.