Specification 49 Stone Mastic Asphalt for Airfields - Ministry of Defence

Specification 49 Stone Mastic Asphalt for Airfields Appendix A – Use of Magnesium Sulfate Test
with Non-Standard Aggregate Fractions
EXAMPLE A.1
Passing
(mm)
Blackstone Quarry, 6 mm nominal single size. Tested 8-25 August 2003
Sieve Size Grading of Test Mass of Test Specimen
Retained
(mm)
Portion (% of
total mass)
Before Test
(g)
First Test Portion
After Test
(g)
Magnesium
Sulfate Value (%
of original mass)
Weighted Mag.
Sulfate value
(%)
37.5 20 0 – – – 0
20 10 0 – – – 0
10 6.3 26.4 303.2 278.2 8.2 2.18
6.3 2 69.4 104.9 98.6 6.0 4.17
2 1 4.2 † – – 6.0 ‡ 0.25
Total 100 Total 6.60
Second Test Portion
37.5 20 0 – – – 0
20 10 0 – – – 0
10 6.3 28.7 296.1 272.3 8.0 2.31
6.3 2 66.2 98.4 92.5 6.0 3.97
2 1 5.1 104.1 98.2 5.7 0.29
Total 100 Total 6.57
Mean 7
† Less than 5 % by mass of total sample, no test specimen.
‡ Taken as equivalent to that for 6.3 mm to 2 mm size under sub-Clause A.6.2, indent (b).
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