Sustainable alternatives should be employed in the construction indus-try to minimize environmental impacts, including high consumption of natural resources and high waste generation. The recycling of waste to be used as aggre-gates for concrete is an alternative with great potential. Although many studies have been carried out to investigate the influence of the use of Recycled Concrete Aggregates (RCAs) on the mechanical properties of concrete, the relationship between the intrinsic properties of aggregates and the main types of long-term deformation of Recycled Aggregate Concrete (RAC) still needs to be better un-derstood. As a matter of the principle, autogenous shrinkage can cause significant damage to concrete structures, mainly due to the induction of cracking that can impair the durability of the structure. In this context, the present paper presents the prelimi-nary results of an experimental investigation aimed at evaluating the influence of RCAs on the autogenous shrinkage of normal and high strength RACs (35 and 60 MPa). The RCA were derived from demolition concrete waste and used in a 9.5 to 19 mm particle size fraction. In addition, the concepts of scientific mix-design for the optimization of dry granular mixture were utilized through the Compressible Packing Model (CPM).

Autogenous shrinkage in structural concrete made with Recycled Concrete Aggregates

Marco Pepe;Enzo Martinelli;
2020

Abstract

Sustainable alternatives should be employed in the construction indus-try to minimize environmental impacts, including high consumption of natural resources and high waste generation. The recycling of waste to be used as aggre-gates for concrete is an alternative with great potential. Although many studies have been carried out to investigate the influence of the use of Recycled Concrete Aggregates (RCAs) on the mechanical properties of concrete, the relationship between the intrinsic properties of aggregates and the main types of long-term deformation of Recycled Aggregate Concrete (RAC) still needs to be better un-derstood. As a matter of the principle, autogenous shrinkage can cause significant damage to concrete structures, mainly due to the induction of cracking that can impair the durability of the structure. In this context, the present paper presents the prelimi-nary results of an experimental investigation aimed at evaluating the influence of RCAs on the autogenous shrinkage of normal and high strength RACs (35 and 60 MPa). The RCA were derived from demolition concrete waste and used in a 9.5 to 19 mm particle size fraction. In addition, the concepts of scientific mix-design for the optimization of dry granular mixture were utilized through the Compressible Packing Model (CPM).
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4735461
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