A Study Of Thermal And Acoustic Performances Of Crumb Rubber Lightweight Foamed Concrete With Density Of 1050 Kg/M3 - 1150 Kg/M3

Chang, Jun Ming (2020) A Study Of Thermal And Acoustic Performances Of Crumb Rubber Lightweight Foamed Concrete With Density Of 1050 Kg/M3 - 1150 Kg/M3. Final Year Project, UTAR.

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Abstract

In this new century, green technology design was started to lead the world towards a better future. Majority of the green technology researches are mainly focusing on the construction field as well. Due to the accumulation of the massive amount of waste rubber tyres at various landfills over the past few decades, waste tyres are recycled and converted to crumb rubber (CR) which can be used as the concrete additives. Thus, this study aims to produce crumb rubber lightweight foamed concrete (CRLWC) with a fresh concrete density ranging from 1050 kg/m3 to 1150 kg/m3. The objective of this study is to determine the optimal mix proportion of granular and powdered CRLWC that exhibit the most favourable thermal and sound insulating properties. There are two experiments, namely thermal conductivity test and acoustic performance test were conducted in this study. For thermal conductivity test, one specimen of each mix proportion was tested. For acoustic performance test, a total of two specimens were used to test for the sound absorption coefficient of the CRLWC in the frequency range from 100 Hz to 5000 Hz. The result showed that the addition of powdered crumb rubber in LWC provides the lowest thermal conductivity with a value of 0.2288 W•K−1 •m−1 as compared with the control sample (0.3490 W•K−1 •m−1 ). Also, the control sample has a better acoustic performance than concrete with the inclusion of CR due to higher void content in the control sample. The absorption coefficient was reduced by 40 % to 60 % in a frequency ranging from 100 Hz to 630 Hz. In conclusion, the participation of CR in LWC can improve the thermal conductivity, but for acoustic performance, the addition of crumb rubber in LWC will be lower the absorption coefficient of LWC.

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