The Potential Of Paddy Husk As Sound Absorber In Concrete Mixture

This work evaluates the performance of cement-based composites made with paddy husk and intended to be used in acoustic barriers. Because acoustic barriers are exposed to external conditions and mechanical loads, a wide range of laboratory tests was performed to evaluate the mechanical, durability, and acoustic characteristics of the composites. This study aims to determine the physical properties of concrete mixture with paddy husk as a partial fine aggregate replacement, assess the acoustical properties of concrete mixture with paddy husk as a partial fine aggregate replacement, and formulate the optimum ratio for concrete mixture with paddy husk as a partial fine aggregate replacement for sound attenuation. Samples were designed to the improvement of insulation noise effects while maintaining strength. The potential of paddy husk as a replacement in the concrete mixture was studied in improving the mechanical potential of the barrier. The strength of the sample is investigated using a compressive test and the noise effect is found using a sound absorption test using an impedance tube. Six samples are prepared according to the compressive test which is three samples are tested on 7 days of age and the other three samples are tested on 28 days of age. For the sound absorption test, samples are prepared according to the actual size of the impedance tube, which is three samples for each category. Based on Malaysian Standard MS EN 1992-1-1:2010, Concrete grade C30 is selected as the control sample by considering XC1 class regarding exposure classes related to environmental conditions in accordance. Concrete with 3% replacement represents the best compressive strength result at 30.63 N/mm2 and sound absorption result 0.351 A. Hence, the strength of concrete achieves the requirement greater than 30 N/mm2 to maintain strength while improving the sound absorption coefficient. A new formulate ratio for improving concrete mixture was achieved