Influence of recycled concrete aggregates on strength properties of concrete

Un hormigón autocompactante eco-amigable con áridos gruesos reciclados

“…This value is lower than that found for the normal concrete, i.e. 10% (11). Thus, the water contents shows in Table 4 are the total water necessary to attain the self-compactability de ned by Gc and Rc parameters values presented in section 2.3.…”

“…A unanimous opinion was found in the literature, here cited, that these characteristics are responsible by the mechanical properties decreases. Tabsh and Abdelfatah (11) found that replacing natural coarse aggregates by recycled coarse aggregates (RCA) in concrete requires 10% of extra water in order to achieve the same slump. Owing to this particularity, the water withdrawal of unit volume of concrete with recycled aggregates should be increased on the basis of that of ordinary concrete (12).…”

Properties of Recycled Aggregate Concrete Reinforced with Polypropylene Fibre

“…The presence of the adhering mortars to recycled aggregate is the main reason for lower quality compared with natural aggregates because the adhered mortar is characterised as porous [5,6] and presents numerous microcracks [6]. As a result, RCA properties are characterised by lower density, higher water absorption capacity, and lower strength compared with the natural aggregate [5,7,8]. Consequently, when using RCA in the production of new concrete, these characteristics of the aggregate may have adverse effect on the fresh and the hardened properties of concrete.…”

Evaluation of Mechanical Properties of Recycled Material for Utilization in Asphalt Mixtures

“…However, the selection of waste material to be used for pavement construction, particularly asphalt surface layer, is of high importance as the application of waste should not adversely influence the structural and functional aspects of the pavements [9][10][11][12].…”