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Mechanical and elastic behaviour of concretes made of recycled-concrete.pdf

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Mechanical and elastic behaviour of concretes made of recycled-concrete

Construction and Building Materials 24 (2010) 1616–1620Contents lists available at ScienceDirect Construction and Building Materials journal homepage: www.elsevier .com/locate /conbui ldmatMechanical and elastic behaviour of concretes made of recycled-concrete coarse aggregates Valeria Corinaldesi * Department of Materials and Environment Engineering and Physics, Università Politecnica delle Marche, Ancona, Italy a r t i c l e i n f o a b s t r a c tArticle history: Received 8 January 2010 Received in revised form 9 February 2010 Accepted 11 February 2010 Available online 16 March 2010 Keywords: Coarse recycled aggregate Drying shrinkage Elastic modulus Recycled-concrete aggregate0950-0618/$ - see front matter 2010 Elsevier Ltd. A doi:10.1016/j.conbuildmat.2010.02.031 * Tel.: +39 071 2204428; fax: +39 071 2204719. E-mail address: v.corinaldesi@univpm.it.In this paper an investigation of mechanical behaviour and elastic properties of recycled-aggregate con- cretes is presented. These concretes were prepared by alternatively using two different (coarse and finer coarse) recycled-aggregate fractions both made of recycled concrete coming from a recycling plant in which rubble from demolition is collected and suitably treated. Several concrete mixtures were prepared by using only virgin aggregates (as reference), 30% finer coarse recycled aggregate replacing fine gravel and 30% coarse recycled aggregate replacing gravel. Five different water to cement ratios were adopted as: 0.40, 0.45, 0.50, 0.55 and 0.60. Concrete workability was in the slump range of 190–200 mm. Com- pression tests were carried out after 28 days of wet curing. In addition, concrete elastic modulus and dry- ing shrinkage were evaluated. Results obtained showed that structural concrete up to C32/40 strength class can be manufactured by replacing 30% virgin aggregate with recycled-concrete aggregate. More- over, a correlation between elastic modulus and compressive strength of recycled-aggregate concre