Abstract
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.
Highlights
At its current level, the technological development of concrete is focused on the optimization of its characteristics, components and mechanical properties, in their durability
The polymeric resin was synthesized from a recycled polyethylene terephthalate (PET) base taken from plastic bottles post-consumption, with the prior elimination of any non-polymer material; their size was reduced with a scissors-type cutting tool, the crushed material was washed in a 50% solution of water and caustic soda to guarantee the elimination of impurities
The process of synthesizing the resin was carried out on the resulting product, which involved adding maleic anhydride and adipic acid at a molar ratio of 1.1:0.5:0.5, with the aim of obtaining the PET additive to be used in the research
Summary
The technological development of concrete is focused on the optimization of its characteristics, components and mechanical properties, in their durability Parallel to this development, a new sustainable concept for concrete has emerged, known as recycled concrete (RC), which is produced by the mixture of natural stone aggregates and recycled coarse aggregates from demolition waste (in specific of old concrete) (RAcoarse ) agglutinated with a cement paste [1,2]. A new sustainable concept for concrete has emerged, known as recycled concrete (RC), which is produced by the mixture of natural stone aggregates and recycled coarse aggregates from demolition waste (in specific of old concrete) (RAcoarse ) agglutinated with a cement paste [1,2] This development arose as an attempt to satisfy the current need for the use of construction waste [3,4]. This performance is related to the composition of the RAcoarse [16] (usually 65%–70% of old natural aggregate and 30%–35% of old adhered mortar [17]), which, in turn, responds to its superior absorption capacity (between 5% and 15%) [17,18] and to the low density of RC [19,20] (between 2090 and 2392 kg/m3 ) [14,21,22]
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