Cheong, Jie Kin (2021) A Study on The Thermal And Acoustic Insulations Of Rubberized Lightweight Foamed Concrete With A Density Of 1400 – 1500 Kg/M3. Final Year Project, UTAR.
Abstract
Nowadays, the amount of scrap tyres has been significantly increasing. As scrap tyres are non-biodegradable, it has caused severe impact on the environment such as landfill overcrowding, fire risk and pest threat. To overcome this problem, scrap tyres can be recycled and used as concrete aggregate in the construction industry. In this study, rubberized lightweight foamed concrete with a density range from 1400 kg/m3 to 1500 kg/m3 was produced using the mix proportion. Two different crumb rubber sizes, powdered and granular crumb rubber, were used to replace the fine aggregate in the replacement proportion from 0 % to 70 %. The effect of crumb rubber on the rubberized lightweight foamed concrete’s thermal and acoustic insulation was investigated. For the thermal conductivity test, the thermal conductivity value, k of the concrete specimens, was determined using the guarded hot plate. As for the acoustic insulation test, the concrete specimens were tested in the frequency range from 100 Hz to 4000 Hz and the sound absorption coefficient was obtained by using an impedance tube. The results show that the inclusion of both crumb rubber improves the thermal conductivity whereby CR-G70 has the lowest thermal conductivity value of 0.5494 W·K-1 ·m-1 . However, the control sample without the addition of crumb rubber achieved better acoustic performance than rubberized lightweight foamed concrete as it has the highest noise reduction coefficient of 19.75 %. This show that the addition of crumb rubber in the lightweight foamed concrete reduced the concrete’s void content, thereby decreasing the sound absorption coefficient. Therefore, it is suggested to conduct further study on rubberized lightweight foamed concrete’s acoustic insulation by reducing its density since the sound absorption coefficient increases with decreasing density of the concrete.
Actions (login required)
![[img]](http://eprints.utar.edu.my/style/images/fileicons/application_pdf.png)
