Effective Water in Concrete with Recycled Aggregate

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Title: Effective Water in Concrete with Recycled Aggregate

Author(s): Antonio Princigallo

Publication: Materials Journal

Volume: 115

Issue: 6

Appears on pages(s): 845-854

Keywords: aggregate; carbonation; durability; grinding; mechanical properties; modulus of elasticity; particle size distribution

Date: 11/1/2018

Abstract:
In the present work, recycled aggregate from construction and demolition waste including both coarse fractions and fines was used to produce structural concrete. A reduction of concrete strength and elastic modulus, in particular using fines and of the carbonation resistance of concrete under accelerated conditions, was observed with respect to using natural aggregate. The mechanism of water absorption of recycled aggregate in concrete was also studied. For the recycled aggregate, even including fines, similar levels of water absorbed to obtain the same strength as natural aggregate in concrete testing were observed. Lastly, it was shown that the water absorption of the recycled aggregate can be reduced by preliminarily carbonating the recycled aggregate. The Los Angeles coefficient was also increased by carbonation.