P.PLUS PTY. LTD.TRADING AS PORPHYRY PLUS

www.porphyryplus.com.au

P PLUS STONEAustralian Porphyry Stone — The stand alone unique porphyry, quarried and manufactured in North Queensland.

AUSTRALIAN STONE:Strong, resilient, earthy and inher-ently individual, yet oozing character and style. Rugged enough to sup-port quarry trucks in the driveway or construction traffic on new roads, but just as good turning on the charm around the swimming pool or the private walled garden retreat.

There is no match for the distinctive and permanent colours, strength and individual style of Australian Porphyry.

Proudly distributed in the southern states of Australia by Porphyry Plus.

Barry NeweyDIRECTOR m. 0418 362 989e. bnewey@porphyryplus.com.au

P.Plus Pty. Ltd. Trading as Porphyry Plus

1/56 Progress Street Dandenong VIC 3175 t. +61 3 9794 9875 f. +61 3 9792 9616 e. info@porphyryplus.com.au w. www.porphyryplus.com.au

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Property Australian Porphyry Stone

ASTM Granite Specifications

ASTM Sandstone

Bulk Specific Gravity (t.m-3) 2.70 2.56 2.003

Water Absorption (mean) % by weight % by volume

0.30 0.81

0.40 –

8 –

Modulus of Rupture (MPa) – Dried Strength – Soaked Strength

23.2 27.5

10.34 10.34

2.4 2.4

Compressive Strength – Dried Strength (MPa)

147.4

131

27.6

Abrasion Resistance Abrasion Index (Ha) 52 25 2

Resistance to Salt Attack Weight Loss (wt %)Mode of Decay

<0.01 No decay visible

– –

1 (4)

–

Slip Resistance AS/NZ4586: 1999 British Pendulum Number (wet)Contribution to risk of Slipping

64 V class – Very low

– –

– –

As/NZS3661.1:93 Coefficient of Friction(wet) 0.63 0.4(3) 0.4

DISCUSSION 4.1 Water Absorption/Bulk

Specific GravityThe mean water absorption of the Australian Porphyry Stone was determined to 0.30% by weight, this compares favourably with the granite ASTM specification which specifies a maximum absorption level of 0.40%: the result is considerably lower than the requirement stated in the sandstone specification. A lower water absorption capacity generally reduces the risk of staining and the establishment of biological growths as well as assisting the stone’s durability. The mean bulk specific gravity of the Australian Porphyry Stone was determined to be 2.70 tonnes/metre(3), this figure also complies with both ASTM specifications.

4.2 Modules of RuptureThe mean modulus of rupture of the Australian Porphyry Stone was found to be 23.2MPa dried and 27.5MPa in a soaked condition. These strength results comply with the requirements of both the granite sandstone ASTM specifications and is far superior to most dimension stone products on the market. The results make the stone eminently suitable for commercial paving projects particularly where the pavement maybe subjected to vehicular traffic.

4.3 Compressive StrengthThe mean compressive strength of the stone was found to be 147.4MPa in a dried condition. This result complies with both ASTM specifications stated.

4.4 Abrasion ResistanceThe Australian Porphyry Stone was found to have a mean Abrasion Index of 52, the stone is considered to have high abrasion resistance; suitable for all commercial and domestic paving situations.

4.5 Resistance to Salt Attack (Durability)The mean weight loss of the Australian Porphyry Stone was determined to be less than 0.01% by weight, this gives the stone an AA Grade Durability classification that is considered suitable for all standard construction uses including pool surrounds or locations that are continually exposed to salt or wetting or drying cycles.

4.6 Slip ResistanceThe split face surface of the Australian Porphyry Stone complies with the slip resistance requirements of the Sydney City Council.

With a V slip resistance classification(5), Australian Standards handbook HB 197.99 recommends that the split face surface is suitable for use in a wide range of locations including external ramps, colonnades, pool ramps and surrounds and external stairs.

(5)The highest slip resistance classification

(1)ASTM C615-96 Standard Specification for Granite Dimension Stone (2) ASTM C616-97 Standard Specification for Quartz - based dimen-sion Stone. (3)Not part of the ASTM specification but the Australian Standard considers a surface with a coefficient of friction of 0.4 or greater to be slip resistant. (4)Not part of the ASTM Standard but a maximum weight loss of 1% is usually specified for sandstone used for prestige commercial projects such as curtain wall cladding.

EVALUATION OF AUSTRALIAN PORPHYRY STONE.

A request was made to Stone Initiatives and Materials Testing Group Pty Ltd to carry out a series of testes on supplied samples of Australian Porphyry Stone.

RESULTS Results are summarised in the table to the right, the results are compared with the ASTM specifications for granite(1) and sandstone(2) dimension stone.

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