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J. Suttle Swanage Quarries
Panorama Road Swanage Dorset England BH19 2QS

tel: 044 01929 423576 fax: 044 01929 427656

e-mail SuttleSales@Stone.uk.com

Purbeck Limestone Certificate of Test Determination of skid resistance

Certificate NO: T5528/14367

Batch No: 604293

Sampled By/Date: Client/not advised

Date Received: 24.4.96

Date Tested: 25.4.96

Tested by: Stats Laboratory Services, Potterswood House, Potters Wood, St Albans, Hertfordshire, AL3 6PQ

Ref: JI/BJH

Methods of test

The samples were tested to determine their resistance to skidding using the portable TRRL skid resistance test apparatus following methods given in BS 6677:1986 Clay and Calcium Silicate Pavers for Flexible Pavements, Part1: Specification for pavers, Appendix E: Determination of Skid Resistance Value, the test surfaces being wetted prior to testing.

Stone name: finish Values determined A B Mean value GLC Rating (see below)
New Vein: Riven 86,85,86,87,87 83,86,85,84,83 85 Excellent
Wetson: Sawn 76,75,74,73,74 79,76,78,78,78 76 Excellent
Thornback: Sawn 72,71,73,72,72 69,72,72,72,71 72 Satisfactory
Grub: Sawn 71,70,69,69,69 71,70,70,70,70 70 Satisfactory
Grub: Sanded 41,38,39,39,40 43,42,42,42,42 41 Satisfactory
Cap: Sawn 73,74,74,75,73 71,70,72,71,71 72 Satisfactory
Cap: Sanded 37,38,38,38,38 38,38,38,38,38 38 Marginal

Results

Remarks

Currently there are no minimum limits for skidding resistance, higher values indicating higher skidding resistance. The former greater London Council produced a report on Pedestrian Safety which came up with the classification given below. For comparative purposes a range of stone types and their performance is also given.

GLC Bulletin 43, item 5, March 1971 Typical Stone Performance Values
Less than of equal to 19 Dangerous Marble (polished) 20 to25
20 to 39 Marginal Concrete Paving Slabs 60 to 70
40 to 74 Satisfactory Flame-Finished Granites 55 to 65
Greater than or equal to 75 Excellent York Stone Flags 75 to 85
 
J. Suttle Swanage Quarries, California Quarry,
Swanage, Dorset, BH19 2QS
+00 44 (0) 1929 423576 (facsimile 427656)