Abstract
The disposal of scrap tires is a challenging task a nd hence an innovative solution to meet these chall enges is needed. Extensive work has been done on the utiliza tion of waste tires in a variety of applications in asphalt pavements and concrete. However, previous investigations focus only on the mechanical properties of th e rubberized materials, but few on the thermal perfor mance. This is especially true for rubberized gypsu m. Limited or no experimental data on the thermal perf ormance of rubberized gypsum board are available. I n this study, an experimental program is established to investigate the effect of amount and size of cru mb rubber on the thermal properties of gypsum material s. Gypsum is replaced by four different percentage of crumb rubber: 10, 20, 30 and 40% by weight of gypsum and two sizes of crumb rubber (#30, #10_20) to make eight rubberized gypsum specimens. The prepared specimens were tested for thermal conductivity using an apparatus specially designed and construct ed for this purpose. The experimental program was concluded by proposing an empirical equation to pre dict the thermal conductivity of rubberized gypsum board. Results indicated better thermal performance of the gypsum board due to the addition of crumb rubber. Thermal conductivity of the rubberized gyps um was 18-38% lower than the ordinary gypsum. It is concluded that thermal conductivity of rubberized g ypsum decreases with the increase of crumb rubber regardless the size of the rubber and that thermal conductivity of mixtures contained 40% of rubber wa s about 38% lower than conventional mixture when crumb rubber #10_20 was added, while the thermal conductivity reduced by 22% when crumb rubber #30 was added. The study suggested for future work to investigate the effect of air voids size and ratio on the thermal conductivity of rubberized gypsum.
Highlights
The significant increase in world energy consumption coupled with the growing demand for low emission sources of energy, creates an urgent need for efficient energy savings in buildings
It is concluded that thermal conductivity of rubberized gypsum decreases with the increase of crumb rubber regardless the size of the rubber and that thermal conductivity of mixtures contained 40% of rubber was about 38% lower than conventional mixture when crumb rubber #10_20 was added, while the thermal conductivity reduced by 22% when crumb rubber #30 was added
The thermal conductivity of crumb rubber particles was evaluated by substituting the conductivities of the mixture and pure glycerol in the arithmetic mean expression provided by Horai and Simmons (1969)
Summary
The significant increase in world energy consumption coupled with the growing demand for low emission sources of energy, creates an urgent need for efficient energy savings in buildings. Several other researchers from NC A&T State University James et al (2011); Ellie et al (2011); Abu-Lebdeh et al (2010a; 2010b); Fini and Abu-Lebdeh (2011) and Hamoush et al (2011) and other governmental and academia agencies investigated several green materials technologies that reduce environmental effects and use recycled materials in infrastructures applications. Motivated by the trend toward green buildings and to reduce the effect of scrap tires on the environment and human health, the authors are currently working on several projects to find a practical and environmentally sound solution of the problem of scrap tires by developing a light weight with low thermal conductivity composite construction materials using waste tires. This research project is an attempt to develop low thermal conductivity of rubberized gypsum boards using waste tires to help solve simultaneously energy and environment concerns by reducing heat transfer into building and recycle rubber tires. A Sodium Hydroxide (NaOH) solution was used as surface treatments to the crumb rubber
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