Sustainable aggregates production : green applications for aggregate by-products.

PDFTech ReportFHWA-ICT-15-012UILU-ENG-2015-2015R27-125Aggregate gradationQuarriesWaste productsFines (Materials)Sustainable developmentLaboratory studiesRecommendationsIllinoisIllinois Center for TransportationTutumluer, ErolOzer, HasanHou, WentingMwumvaneza, Vincent\uc2\ua0Illinois Center for TransportationUnited States. Federal Highway AdministrationIllinois. Dept. of TransportationUS Transportation CollectionIncreased emphasis in the construction industry on sustainability and recycling requires production ofaggregate gradations with lower dust (cleaner aggregates) and smaller maximum sizes\ue2\u20ac\u201dhence, increasedamount of quarry by-products (QBs). QBs are usually less than 1/4 in. (6 mm) in size. This report providesfindings of an industry survey conducted among Illinois aggregate producers on the annual production rate,excess QBs generated, and current application areas of QBs. In addition, a detailed laboratory study wasconducted to characterize the engineering properties of QB materials produced in the primary, secondary,and tertiary aggregate production stages from four different quarries operating in the State of Illinois. Sinceunconfined compressive strength for QB materials was low (less than 11 psi), chemical admixturestabilizers such as Portland cement and Class C fly ash were used to improve the strength properties ofQB materials. Significant increases in the strength of stabilized QB materials observed may indicatesuitability of QBs for sustainable pavement applications. Recommendations are made on potentialstrategies to utilize excess fines by incorporating QB materials in pavement construction