Abstract Manager

The use of coarse recycled concrete aggregates (CRCA) in concrete as a substitute for natural aggregate (NA) has lately sparked a lot of attention. As more studies into its performance have been undertaken, the usage of CRCA is gaining acceptability. In the same way, including supplementary cementitious materials (SCMs) in concrete mixes helps to reduce cement usage and carbon dioxide emissions. Substituting NA for CRCA and conventional cement with SCMs is a potential step toward a more sustainable concrete that conserves natural resources while lowering concrete's environmental effect. As a result, using these materials is an environmentally friendly solution. This paper includes research on concrete mixes' mechanical and durability qualities, including CRCA and SCMs, for use in interlocking concrete pavers (ICP). The performance of three concrete mixes with varying percentages of CRCA and SCMs (0%, 20% and 40%) and (0%, 20% and 30%) respectively is compared to the control mix. This investigation employed Ground Glass Pozzolans (GP), Limestone Cement (GUL), and Slag as SCMs. After the air voids and slumps are measured, the compressive strength of various mixtures at different curing times (1, 7, and 28 days), water absorption and freeze-thaw resistance are evaluated. The results indicate that the water-cement (w/c) ratio in each concrete mix changed to achieve the slump value of 55 ± 5 mm. Furthermore, the outcomes revealed that the w/c ratio of mixes with just the CRCA was higher than that of the control mix, and the mixes with a combination of CRCA and SCM were almost equal to that of the control mix. The findings also demonstrate that adding SCMs to concrete mixtures substantially enhances the water absorption resistance. Compressive strength values of all the mixes were comparable to that of the control mix. However, CRCA-containing mixtures had a lower strength value than other mixes. Interestingly, the freezing-thawing test results demonstrated that the mass loss of the mixes with CRCA and SCMs was lower than the control mix by 57% to 77%. Finally, the findings of this research provide compelling evidence to support the use of CRCA and SCMs to partly replace NA and conventional cement in concrete, serving as a step towards more sustainable concrete construction.