Reuse of Crushed Concrete as a Road Base Material

Aggregates from crushed road concrete were tried in 7 test sections, and 84 samples from some lOcrushing plants were :ested in the laboratory. lt has been shown that aggregates suitable for re-use in sub-Jases or road bases can be produced not only in fixed plants butalso by small mobile crushers, provided the necessary precau-tions are taken right from the demolition stage.Investigations into static compressive strength, particle shape,dry density and level of compaction, bearing capacity in situand its evolution, triaxial tests and evidences of residualhydraulicity have shown that excellent results can be obtainedwith crushed road concrete aggregates as unbound road basematerials.I'he economic study has demonstrated that the in situ recyclingof concrete can be very advantageous, mainly as a result ofsavings on transport and the avoidance of dumping costs.