[en] In this study, the impact of steel fibres and Silica Fume (SF) on the mechanical properties of recycled aggregate concretes made of two different types of Recycled Coarse Aggregates (RCA) sourced from both low- and high-strength concretes were evaluated through conducting 60 compressive strength tests. The RCAs were used as replacement levels of 50% and 100% of Natural Coarse Aggregates (NCA). Hook-end steel fibres and SF were also used in the mixtures at the optimised replacement levels of 1% and 8%, respectively. The results showed that the addition of
both types of RCA adversely affected the compressive strength of concrete. However, the incorporation of SF led to compressive strength development in both types of concretes. The most significant improvement in terms of comparable concrete strength and peak strain with ordinary concrete at 28 days was observed in the case of using a combination of steel fibres and SF in both recycled aggregate concretes, especially with RCA sourced from high strength concrete. Although using SF slightly increased the elastic modulus of both recycled aggregate concretes, a substantial improvement in strength was observed due to the reinforcement with steel fibre and the coexistence of steel fibre and SF. Moreover, existing models to predict the elastic modulus of both non-fibrous and fibrous concretes are found to underestimate the elastic modulus values. The incorporation of SF changed the compressive stress-strain curves for both types of RCA. The addition of steel fibre and SF remarkably improved the post-peak ductility of recycled aggregates concretes of both types, with the most significant improvement observed in the case of RCA sourced from a low-strength parent concrete. The existing model to estimate the compressive stress-strain curve for steel fibre-reinforced concrete with natural aggregates was found to reasonably predict the compressive stress-strain
behaviour for steel fibres-reinforced concrete with recycled aggregate.
Disciplines :
Civil engineering
Author, co-author :
Jahandari, Soheil; Centre for Infrastructure Engineering, Western Sydney University, Penrith, NSW 2751, Australia
Mohammadi, Masoud; Centre for Infrastructure Engineering, Western Sydney University, Penrith, NSW 2751, Australia
Rahmani, Aida; Centre for Infrastructure Engineering, Western Sydney University, Penrith, NSW 2751, Australia
Abolhasani, Masoumeh; Department of Civil and Environmental Engineering, Alaodoleh Semnani Institute of Higher Education, Garmsar 5815, Iran
Miraki, Hania; Department of Civil Engineering, Iran University of Science and Technology, Tehran 6846, Iran
Mohammadifar, Leili; Department of Architectural Engineering, Kerman Branch, Islamic Azad University, Kerman 1167, Iran
Kazemi, Mostafa ; Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo
Saberian, Mohammad; School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
Rashidi, Maria; Centre for Infrastructure Engineering, Western Sydney University, Penrith, NSW 2751, Australia
Language :
English
Title :
Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres
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