Acoustic properties viz., noise reduction coefficient (NRC) increases from 25 to 45% with increase in rice straw addition and a decreasing trend in sound transmission class (STC) from 37 to 28 dB.
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Performance behaviour of agro-waste based gypsum hollow blocks for partition walls.
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The sentences
In frequency range of 250 to 500 Hz, the STL values are 40 to 44 dB and follow an increasing trend as the frequency increases.