Use of Unconventional Aggregates in Hot Mix Asphalt Concrete

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Annually 100 to 200 thousand tons of steel slag aggregates are produced in Latvia. The study investigates the use of dolomite sand waste as a filler or/and sand material plus BOF steel slag as a fine and coarse aggregate for the design of high performance asphalt concrete.

Various combinations of steel slag, dolomite sand waste and conventional aggregates were used to develop AC 11 asphalt concrete mixtures. The tests of mix properties included resistance to permanent deformations (wheel tracking test, dynamic creep test) and fatigue resistance. Laboratory test results showed that asphalt concrete mixtures containing steel slag and local limestone in the coarse portion and dolomite sand waste in sand and filler portions had high resistance to plastic deformations and good resistance to fatigue failure.

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