General Characteristics

For Bruhn Limestone Supplied By CSIRO

PROPERTY	RANGE OF VALUES	MEAN
Colour	White Cream to pale brown
Grain Size	Fine to medium, clastic
Nature	Fragmental, organic limestone (fossiliferous: bryozoal).
Composition	Dominantly calcite, trace dolomite.
Porosity (effective) %	36 – 44	39.9
Porosity (total) %	63 – 59	56.4
Saturation coefficient	0.68 – 0.74	0.71
Compressive strength Mpa
Dry	1.08 – 5.71	3.55
Soaked	0.7 – 2.1	1.4
Modulus of Rupture MI’53 – 58
Dry	1.0 – 2.7	1.7
Soaked	0.7 – 2.1	1.4
Young’s Modulus MI’a 10
Dry	0.57 – 7.70	2.2
Soaked	0.38 – 3.69	1.5
Poisson’s Ratio
Dry	-0.14 – 0.64	0.18
Soaked	-1.05 – 0.87	0.08
Ultrasonic Pulse Velocity m/sec	1660 – 2445	2140
Dimensional Instability, %	0.02 – 0.06	0.05
Coefficient of Thermal expansion, mm/mm/ C 10	3 – 6	5

Thermal Conductivity Rating (R Rating) @ 100mm thick = 0.20 +/-0.04 Wm-1 K-1 (3 times better than Brick).

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