Title:
Reactivity Assessment of Recycled Concrete Aggregates to Sulfate Attack
Author(s):
Lautaro Santillan, Claudio Zega, and Edgardo F. Irassar
Publication:
Materials Journal
Volume:
121
Issue:
5
Appears on pages(s):
63-74
Keywords:
recycled aggregate; recycled concrete (RC); sulfate attack; test methods
DOI:
10.14359/51742039
Date:
9/1/2024
Abstract:
The attached cement paste in recycled concrete (RC) aggregateleads to its potential reactivity against sulfate ions. Several testmethods were evaluated to find a suitable, reliable, and accuratemethod to evaluate the potential reactivity of aggregates. Differentquality RC aggregates were used to apply those methods. Thestudies included evaluations of concrete cores drilled from sourceconcrete (SC), RC aggregates, recycled mortar bars under differentexposures, and RC prisms exposed to external sulfate attack (ESA).The concrete core test allowed qualifying SC as potentially reactiveagainst sulfate in a short time. Tests on recycled aggregates andrecycled mortar bars showed variable sensitivity levels. Resultsfrom concrete prisms showed an effective reactivity of recycledaggregates when the replacement is higher.