Waliyo, Rabiatul Adawiyah (2023) Acoustic performance of RHA-seawater concrete with coal bottom ash as sand replacement in low frequency by sound absorption and transmission. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Concrete production can lead to continuous global pollution such as emission of carbon dioxide gases (CO2), water pollution, noise pollution and increase the limitation of non-renewable resource usage. The development of concrete with seawater as mixing water, rice husk ash as cementitious material and coal bottom ash as the sand replacement showed a good structural compressive strength at 28 days. Rice husk ash (RHA) increases the C-S-H compound, improves concrete strength and produces less void in the concrete. As for seawater, it tends to induce concrete early strength meanwhile coal bottom ash (CBA) reduces concrete density due to its porous structure. This research is to investigate the sound absorption and sound transmission of concrete with zero freshwaters, replacing cement with 10% RHA and eliminating sand with coal bottom ash (CBA) at 10%, 20%, 30%, 40%, 50, 60%, 70%, 80%, 90% and 100% replacement. Secondary data was obtained through a 100 mm x 100 mm x 100 mm cube compressive strength following BS EN 12390-3:2019. The trial series of seawater concrete with 10% RHA was conducted to determine a strength of more than 50 MPa without CBA achieved at 28 days. The concrete was design based on the DOE (British) Mix Design Method with a constant water-to-cementitious of 0.39. The acoustic performance test was conducted using impedances tube which complies with BS EN ISO 10534-2:2001. Specimens were tested using 100 mm diameter in cylindrical concrete with 100 mm and 200 mm thickness at low frequency to1200 Hz. Result shows that the highest sound absorption coefficient was 0.48 at 400 Hz for 100 mm thickness and 0.52 at 250 Hz for 200 mm thickness. As for sound transmission, thickness of 100 mm and 200 mm achieved 31.08 dB and 25.99 dB of transmission loss (TL) at 1200 Hz, respectively. It can be concluded that, concrete with good strength resulted in lower sound absorption and transmission and better than conventional concrete. This research is in line with Malaysia Construction 4.0 Strategic Plan 2021 – 2025 where advanced building materials is one of the emerging technologies to be developed by integrating new technologies in creating a new product

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