Photo courtesy of Tom Kuennen
RoadScience
Raw demolition concrete is broken and sorted
in advance of processing into clean fraction.
in aggregate particles that are often more angular and rough
than typical virgin aggregates, and their properties are somewhat different. RCA typically has a higher absorption capacity,
lower specific gravity, greater mass loss in tests such as L.A.
abrasion and higher chloride content than virgin aggregates,
reports the ACPA.
Nonetheless, the ACPA says RCA aggregates typically must
(and generally do) meet the same requirements as virgin aggregates for the target application, even if the RCA is produced
from a concrete pavement with a materials-related distress
such as D-cracking or alkali-silica reactivity (ASR).
The mortar content of the final RCA product is a key to a
successful application. Crushed concrete will reduce to either
large-size coarse aggregate particles or smaller mortar par-
Smooth as glass.
topconpositioning.com/mmgps-paving
22 November 2013 Better Roads
