Abstract:
Since there is a possibility of incorporating recycled aggregates (RA) as a complement
to primary aggregates (PA) in concrete production, taking advantage of construction
and demolition waste, there are some questions on the durability of concrete with recycled aggregates
(CRA) that need to be answered.
The durability of concrete with primary aggregates only (CPA) is conditioned, among other factors,
by its degradation due to alkali-silica reactions (ASR). Since the first cases of ASR in CPA
were identified, this expansive reaction has been a research theme resulting in the development
of prevention and mitigation methodologies and in the comprehension of the chemical reactions
involved.
The present paper proposes to describe the current development of a research program on ASR
in CRA based on an experimental campaign involving the production of CRA with different replacement
ratios of coarse PA with coarse concrete RA, the use of different cement classes, and
variations on the concrete curing conditions and on the reactivity of the mixes.
