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Estimation of rubber waste concrete properties by ultrasonic velocities: effect of transducers’ diameters and frequencies

Boudjedra Fatiha, Benouis Abdelhalim, Boudaoud Zineddine

Civil and Environmental Engineering Reports

2020

Vol. 30, no. 2

200--220

This experimental study aimed to use the ultrasonic pulse velocity method (UPV) in order to investigate the effect of rubber tire waste content and transducers’ diameters and frequencies on the evolution of ultrasonic velocities in time and to elucidate the correlations between UPV and the properties of various concrete mixtures. The incorporation of this waste involved volume substitution (0, 5, 10, 15 and 20%) of fine aggregates (sand) by rubber waste (RW) granulates. The dry unit weight, porosity, compressive and flexural strengths, and velocity of ultrasonic waves with different transducers - which presents the non-destructive technique - were evaluated. Rubberized concrete mixtures showed increases in porosity with lower dry unit weight compared to the control concrete. Compressive strength, flexural strength and ultrasonic velocity obtained by all transducers decreases with increasing RW content. These decreases are not influenced by the curing age of concretes. Decreases in the diameter and frequency of transducers caused reductions in ultrasonic velocity. These reductions are not influenced by the volume replacement of sand by RW. Correlations showed that ultrasonic velocity represents a reliable non-destructive technique for measuring the properties of rubberized concretes.

Utilization possibilities of selected wastes by pyrolysis

Mikulova Z., Brozova S., Pustejovska P.

Hutnik, Wiadomości Hutnicze

2009

Vol. 76, nr 7

527-529

Wreck of a car is treated as a waste stream when vehicles are shredded to recover metals. Wreck of a car is composed mostly of plastics, foam and rubber. Due to such a composition, pyrolysis of these materials appear to offer many advantages as a resource recovery option. This study deal with pyrolysis of some wreck of a car at 650 °C in semiindustrials scale screw kiln reactor with a feed rate of 5 kg/h.

Wrak samochodu jest traktowany jako strumień odpadów, kiedy złom samochodowy jest strzępiony w celu odzyskania metalu. Wrak samochodowy zbudowany jest głównie z plastików, pianek i gumy. Z powodu takiego składu piroliza tych materiałów może zaoferować wiele korzyści jako sposób odzyskiwania zasobów. Badania te związane są z pirolizą wraku samochodowego w temperaturze 650 °C w skali półprzemysłowej w śrubowym piecu do suszenia z szybkością zasilania 5 kg/h.