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Materials (Basel). 2017 Feb 14;10(2). pii: E176. doi: 10.3390/ma10020176.

Metamorphosis in the Porosity of Recycled Concretes Through the Use of a Recycled Polyethylene Terephthalate (PET) Additive. Correlations between the Porous Network and Concrete Properties.

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Faculty of Engineering Mochis, Autonomous University of Sinaloa, Fuente de Poseidón y Ángel Flores s/n, Col. Jiquilpan, Module B2, Los Mochis, Sinaloa 81210, Mexico.
Barcelona School of Building Construction, Polytechnic University of Catalonia, Av. Doctor Marañón 44-50, Barcelona 08028, Spain.
Barcelona School of Civil Engineering, Polytechnic University of Catalonia, C. Jordi Girona 1-3, Building C2, Barcelona 08034, Spain.


In the field of construction, sustainable building materials are currently undergoing a process of technological development. This study aims to contribute to understanding the behavior of the fundamental properties of concretes prepared with recycled coarse aggregates that incorporate a polyethylene terephthalate (PET)-based additive in their matrix (produced by synthesis and glycolysis of recycled PET bottles) in an attempt to reduce their high porosity. Techniques to measure the gas adsorption, water porosity, Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used to evaluate the effect of the additive on the physical, mechanical and microstructural properties of these concretes. Porosity reductions of up to 30.60% are achieved with the addition of 1%, 3%, 4%, 5%, 7% and 9% of the additive, defining a new state in the behavioral model of the additive (the overdosage point) in the concrete matrix; in addition, the porous network of these concretes and their correlation with other physical and mechanical properties are also explained.


PET additives; acoustic resonance spectroscopy; concrete porosity; polymeric resins; porosimetry of gas adsorption; recycled concrete

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