EFFECT OF RECYCLED AGGREGATE CONCRETE ON EARLY AGE BEHAVIOR

Author(s): Ahmed Z. Bendimerad, Brice Delsaute, Emmanuel Roziere, Stéphanie Staquet, Ahmed Loukili
Paper category: Proceedings
Book title: proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Service Life of Cement-Based Materials and Structures
Editor(s): Miguel Azenha, Ivan Gabrijel, Dirk Schlicke, Terje Kanstad and Ole Mejlhede Jensen
ISBN:978-2-35158-170-4
e-ISBN: 978-2-35158-173-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 407-414
Total Pages: 8
Language : English

Abstract: This paper presents the results of experimental research on recycled aggregate concrete at
early age. The influence of recycled gravel (RG) and recycled sand (RS) on plastic shrinkage
and cracking sensitivity was investigated. The concrete mixtures were designed using 30%
and 100% of recycled gravel, and 30% of recycled sand. The total water was kept constant for
all the mixtures during the mixing process. The gravel/sand ratios were adjusted to keep the
Maximum Paste Thickness (MPT) constant. To understand the evolution of early age
parameters, a timeline was established and the analyses showed correlations between the
evolution of plastic shrinkage and other properties at early age. A stress/strength approach
based on experimentally assessed parameters was used to compare the cracking sensitivity of
different concretes with recycled aggregates. A high rate of substitution of recycled gravel or
sand affected the early age properties of the recycled concrete and the cracking sensitivity
especially when natural sand was replaced by recycled concrete sand

Online publication : 2016
Publication type : full_text
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