A Locally Available Natural Pozzolan as a Supplementary Cementitious Material in Portland Cement Concrete

For several decades, class F fly ash has been an attractive supplementary cementitious material, at least in part, due to its ability reduce Portland cement consumption and mitigate alkali-silica reactions concrete. However, availability is becoming uncertain as the energy industry decommissions coal burning power plants it transitions renewable production. This situation creates a need identify viable sustainable alternative materials. There are types of materials, such natural pozzolans, metakaolin, or ground granulated blast-furnace slag, which appear be potential alternatives In this research, locally available pozzolan (pumicite) was selected replace After conducting reaction tests on mortar mixtures, rheological strength properties, shrinkage, resistance freezing thawing, chloride ion permeability concrete mixtures containing different amounts were evaluated. The results showed that pumicite more effective than mitigating reaction, content 20% necessary reaction. Ternary both most materials combinations for expansion. Additionally, provided acceptable compressive modulus rupture values (greater 4.0 MPa) exceeded flexural strengths by established only ash. Shrinkage durability factor all less 710 μstrain greater 75, generally considered acceptable. with expansions had very low permeability. These indicate can reliable