Waste materials can be utilized for light concrete brick mixtures, and it is hoped that they will produce beneficial effects on the thermal and acoustic properties of building interiors. In humid tropical climates, building envelope walls are characterized to be heat-resistant for saving or efficiency of air conditioning. Additionally, the building envelope has also to be able to block or reduce external noise to get a comfortable sound intensity in rooms. Besides the inner walls with an adequate sound absorption coefficient can take a role to get a comfortable time reverberation in rooms. This study involves testing the thermal and acoustic properties of various waste mixtures in light concrete bricks. The organic and inorganic wastes that were taken include paper scraps, plastic, rice husks, coconut coir, and wood sawdust. Measurement of thermal conductivity by using a quick thermal conductivity meter of the bricks and the aggregates were realized for 7 samples. Thermal-conductivity, conductance and transmittance of the light concrete with waste mixtures can also be estimated by using electrical-analogic heat transfer model. Meanwhile, the acoustic property tests include sound absorption coefficient and sound transmission loss by using a tube impedance apparatus. By this study it was found that the thermal transmittance (U) values of the samples ranged from 0.62 to 0.70 W/m2K, while the sound transmission loss were from 12 to 34 dB and the sound absorption- coefficients ranged from 0 to 0.32 with sound frequency varied from 500 to 1250 Hz.
Sangkertadi et al. (Fri,) studied this question.