Paper mill sludge as fiber additive for asphalt road pavement
2009
Mari, E.L. | Moran, Ma.S.R. | Austria, C.O.
This study evaluated the properties of stone mastic asphalt mixtures made with paper mill sludge from four paper mills, as well as waste paper, as fiber additive. Marshall specimens were prepared with asphalt content of 4.5, 5.0, 5.5, 6.0 and 6.5% and sludge or fiber contents of 0.2, 0.3, 0.4 and 0.5 percent. Properties tested were bulk specific gravity, stability, flow, air voids, voids in mineral aggregates and voids filled with asphalt. Effects of asphalt and fiber contents on flow and stability were analyzed statistically. Asphalt contents between 5 and 6 percent and sludge or fiber contents between 0.3 and 0.5% from any of the four paper mills resulted in marshall specimens with properties generally passing the Department of Public Works and Highways specifications for both medium and heavy traffic road pavement.
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