Application of ultra high-performance mortar for producing high-performance pervious concrete with low carbon emissions and cost

The main objective of this research is to produce high-performance pervious concrete (HPPC) incorporated with recycled concrete aggregate (RCA) having different sizes i.e., large size (9.5-12.5 mm) and small size (4.75-9.5 mm). Ultra high-performance mortar (UHPM) was used to improve the interfacial transition zone (ITZ) using high-volume ground bottom ash (BA) and unprocessed fly ash (OFA) between the mortar matrix and aggregate in HPPC. For the mechanical strength of HPPC, most of the concrete types exhibited compressive strength and satisfied the minimum requirement of HPPC more than 40 MPa. HPPC made with natural coarse aggregate (NCA) had higher strength properties than HPPC made with RCA at both aggregate sizes. The larger size of aggregate in HPPC had lower strength properties than the smaller size of aggregate. In terms of the microstructure test, SEM results revealed a denser ITZ matrix of HPPC mixed with ground BA, or HPPC mixed with ground BA and OFA as compared to HPPC mixed with only Portland cement. For the TGA test, the CH content was low in paste sample having ground BA or paste sample having ground BA and OFA, which supports the SEM results. Furthermore, the MIP results revealed that the cumulative pore volume and dV/dlogD pore volume of paste sample containing ground BA or paste sample used ground BA and OFA were lower than those of paste sample containing only Portland cement. This study also indicated that HPPC containing highvolume ground BA, FA, and RCA had considerably lower cost and carbon emissions than that of HPPC with Portland cement and natural coarse aggregate.