acoustical properties of railway ballast ????

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Erich Meisterhofer - 22 Jan 2004 07:08 GMT

Can you give me hints on where to find acoustical properties af railway
ballast (e.g. frequency dependant absorption)?

Thanks for your help

Erich Meisterhofer
TB Physik
Schubertstraße 72
A-8010 Graz
Austria

tbphysik@sime.com

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Brian Marston - 22 Jan 2004 15:07 GMT

> Can you give me hints on where to find acoustical properties af railway
> ballast (e.g. frequency dependant absorption)?
[quoted text clipped - 8 lines]
>
> tbphysik@sime.com

Hoping this may assist ~

Some old data from
~ Physics Society Proceedings ~ Vol.52 Pg.371 (1940) ~ GWC Kaye & EJ Evans

Ballast (granite) 1500 stones per cubic foot 11" thick (72 lbs/cubic foot)
125 0.20
250 0.45
500 0.25
1000 0.50
2000 0.60
4000 ---

Ballast (limestone) 1500 stones per cubic foot 11" thick (67.5 lbs/cubic foot)
125 0.30
250 0.40
500 0.35
1000 0.60
2000 0.80
4000 ---

Ballast (slag) 900 stones per cubic foot 11" thick (67.5 lbs/cubic foot)
125 0.30
250 0.45
500 0.35
1000 0.65
2000 0.90
4000 ---

Foamed Slag graded between 1/4" and 1/2" - 11" to 12" thick (26 lbs/cubic foot)
125 0.65
250 0.70
500 0.75
1000 0.80
2000 0.80
4000 0.80

regards

Brian Marston
BGMA Pty Ltd
AUSTRALIA
www.bgma.com.au

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Natural Science Forum / Physics / Acoustics / January 2004

acoustical properties of railway ballast ????