Title: Reactivity Assessment of Recycled Concrete Aggregates to Sulfate Attack

Author(s): Lautaro Santillán, Claudio Zega and Fabian Irassar

Publication: Materials Journal

Volume:

Issue:

Appears on pages(s):

Keywords: recycled aggregate; recycled concrete; sulfate attack; test methods

DOI: 10.14359/51742039

Date: 7/10/2024

Abstract:
The attached cement paste in the recycled concrete aggregate leads to its potential reactivity against sulfate ions. Several test methods were evaluated to find a suitable, reliable, and accurate method to evaluate the potential reactivity of aggregates. Different quality recycled concrete aggregates were used to apply those methods. The studies include evaluations of concrete cores drilled from source concrete, recycled concrete aggregates, recycled mortar bars under different exposures, and recycled concrete prisms exposed to external sulfate attack. The concrete core test allowed qualifying source concrete as potentially reactive against sulfate in a short time. Tests on recycled aggregates and recycled mortar bars showed variable sensitivity levels. Results from concrete prisms showed an effective reactivity of recycled aggregates when the replacement is higher.