Influence of proportioning criteria on recycled concrete properties

Title: Influence of proportioning criteria on recycled concrete properties
Author(s): F. López-Gayarre, P. Serna, A. Domingo-Cabo, M.A. Serrano-López, C. López-Colina and E. García-Taengua
Paper category : conference
Book title: 2nd International RILEM Conference on Progress of Recycling in the Built Environment
Editor(s): V.M. John, E. Vazquez, S.C. Angulo, C. Ulsen
e-ISBN: 978-2-35158-122-3
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 389 - 400
Total Pages: 12
Nb references: 26
Language: English

Abstract: This paper presents the results of experimental research using concrete produced by substituting part of the natural coarse aggregates for recycled aggregates from concrete demolition. The influence of the following factors has been determined: the percentage of replacement, the strength and workability of the concrete to be produced, the amount of declassified and source of aggregate, the granular structure of the concrete and the replacement criteria. The properties analyzed in the recycled concretes were: density, absorption, compressive strength, elastic modulus, amount of occluded air, penetration of water under pressure and splitting tensile strength.

A highly simplified test program was designed in order to make the number of tests viable whilst guaranteeing the reliability of the conclusions. Instead of making 576 mixtures that correspond to a complete tests plan, it was only made 27 mixtures according to L27 modified orthogonal array devised by Taguchi to experiments design.

The type of aggregate and the percentage of replacement were the only factors that showed a clear influence on most of the properties. If the water-cement ratio is kept constant and the loss of workability due to the effect of using recycled aggregate is compensated for with additives, the percentage of replacement of the recycled aggregate will not affect the compressive strength.

Online publication: 2012-02-08
Publication type : full_text
Public price (Euros): 0.00