EFFECTS OF THE USE OF RECYCLED CONCRETE AGGREGATES ON THE DRYING SHRINKAGE OF NORMAL AND HIGH STRENGTH CONCRETE

Author(s): Mayara Amario, Caroline S. Rangel, Marco Pepe, Romildo D. Toledo Filho
Paper category: Proceedings
Book title: IV International Conference Progress of Recycling in the Built Environment
Editor(s): Isabel M. Martins, Carina Ulsen, Yury Villagran
ISBN:
e-ISBN: Isabel M. Martins, Carina Ulsen, Yury Villagran
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 374-381
Total Pages: 08
Language : English

Abstract: The main difference of the Recycled Concrete Aggregate (RCA), compared to the natural
ones, is their greater porosity and, consequently, higher water absorption. Many researches
have been carried out to investigate the influence of the use of RCA on the mechanical
properties of concrete, but studies on the effects of RCA on the main concrete deformations is
still very limited. The drying shrinkage is an important property, because it produces internal
tensions and mass loss and, consequently, reduction in the concrete volume. This process can
cause multiple cracking, damaging the durability of the material.
In this context, this study presents the results of an experimental campaign to evaluate the
influence of RCAs on the drying shrinkage and the mechanical properties of different
Recycled Aggregate Concrete (RAC) mixtures. RCAs from laboratory-produced waste were
used in two size fractions (i.e., 4.8 mm to 9.5 mm and 9.5 mm to 19 mm). Normal and high
strength concrete (35 and 60 MPa) with 100% of RCA in each size fraction were produced.
The results showed that the smaller the modulus of elasticity, the greater the drying shrinkage.
In addition, the drying shrinkage of the RACs was slightly higher than the strain of the
reference mixtures.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00