Abstract
In this research, an investigation was carried out on the effect of sodium sulphate attack on the durability of composites produced with waste polyethylene terephthalate (PET). Experiments were accomplished on limestone sand and cement mortars where the blended Portland cement was partially replaced by various volume fractions of waste PET particles (6%, 12% and 17%). The test solutions used to supply the sulphate ions and cations were 5%sodium sulphate solution. Compressive strengths measured on specimens were used to assess the changes in the mechanical properties of PET-mortars exposed to sulphate attack at different ages, mainly the Young modulus of elasticity. Based on experimental compressive tests on PETMortar composite specimens and there densities, the evolution of Young modulus of elasticity has been analyzed in accordance with normative models given by (ACI-318) and (BS-8110) codes of practice. In addition, a comparative study has been carried out for corrosion resistance coefficients K of unmodified mortar to those modified with waste PET particles. It can be noticed that, for the composite immersed in a corrosive Na2SO4 solution, the corrosion resistance coefficients decrease with the increase of the immersion period. The corrosion sulphate resistance K based on Young modulus before and after immersion of PET-mortar composites is better than that of the control mortar. Therefore, for safety considerations of PET-mortar composites use, ACI 318 is recommended code for design and investigation works. Also, it can be concluded that adding waste PET by volume fractions (6%, 12% and 17%) to blend Portland cement renders this cement more resistant to the sodium sulphate aggressive medium. Therefore, composites materials based waste PET aare often presented as the materials of the future because of their potential for innovation and the advantages they offer. In fact, using waste PET as cement substitutes reduces the energy consumption. These modified mortars address problems related to environmental pollution by CO2 emissions, and are used to repair various reinforced concrete structures in sodium sulphate aggressive mediums.
Highlights
In the last couple years, waste polyethylene terephthalate (PET) is produced within large amount by plastic industry in all over the world [1] andsince PET waste is not biodegradable, it can remain in nature for hundreds of years and causes too many environmental problems.Various studies [2-6] have been developed so far in order to find ecologic and green ways to dispose of plastics wastes, one of the main solutions proposed by researchers is to incorporate waste PET in building materials technology in order to substitute volumetric amount of cement [7] and/or aggregates [8-10] in concrete and mortars mix-design.In this research, an investigation was carried out on the effect of sodium sulphate attacks on the durability of composites produced with waste polyethylene terephthalate (PET)
Compressive strengths measured on specimens were used to assess the changes in the mechanical properties of PET-mortars exposed to sodium sulphate attacks at different ages, mainly the Young modulus of elasticity.After compression testing, X-ray diffraction was conducted on some selected surface fractures to investigate microstructural nature of the sulphate attacks
Young modulus loss ratios have been studied for several volumetric waste PET rates and for each model of predicted codes
Summary
In the last couple years, waste polyethylene terephthalate (PET) is produced within large amount by plastic industry in all over the world [1] andsince PET waste is not biodegradable, it can remain in nature for hundreds of years and causes too many environmental problems. An investigation was carried out on the effect of sodium sulphate attacks on the durability of composites produced with waste polyethylene terephthalate (PET). Compressive strengths measured on specimens were used to assess the changes in the mechanical properties of PET-mortars exposed to sodium sulphate attacks at different ages, mainly the Young modulus of elasticity.After compression testing, X-ray diffraction was conducted on some selected surface fractures to investigate microstructural nature of the sulphate attacks
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