Influence of particle size distribution of conventional fine aggregate and construction demolition waste aggregate in Portland cement mortar

Recycled aggregates present a varied mineralogical composition and the grading of these particulates over their particle size distribution influence aggregate properties as well those composites that they form. This study proposed comparative investigation fine from two different origins, namely, natural crushed stone construction demolition waste (CDW). Three distributions were defined, so each had its fineness modulus (FM) ranked in granulometric ranges, following NBR 7211 Brazilian standard. The tests carried out: consistency, bulk density fresh state, compression strength, absorption (by immersion capillarity), dimensional mass variation. results showed impacted mortar that, when analyzed along with distribution, CDW behavior function distribution. Another finding was mortars produced granulometry below lower optimal zone (FM<2.20) presented reduced mechanical physical performance. Therefore, it concluded should not be included same standards conventional regarding composition.