Specification 49 Stone Mastic Asphalt for Airfields - Ministry of Defence
Specification 49 Stone Mastic Asphalt for Airfields - Ministry of Defence
Specification 49 Stone Mastic Asphalt for Airfields - Ministry of Defence
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<strong>Specification</strong> <strong>49</strong> <strong>Stone</strong> <strong>Mastic</strong> <strong>Asphalt</strong> <strong>for</strong> <strong>Airfields</strong> Appendix A – Use <strong>of</strong> Magnesium Sulfate Test<br />
with Non-Standard Aggregate Fractions<br />
EXAMPLE A.1<br />
Passing<br />
(mm)<br />
Blackstone Quarry, 6 mm nominal single size. Tested 8-25 August 2003<br />
Sieve Size Grading <strong>of</strong> Test Mass <strong>of</strong> Test Specimen<br />
Retained<br />
(mm)<br />
Portion (% <strong>of</strong><br />
total mass)<br />
Be<strong>for</strong>e Test<br />
(g)<br />
First Test Portion<br />
After Test<br />
(g)<br />
Magnesium<br />
Sulfate Value (%<br />
<strong>of</strong> original mass)<br />
Weighted Mag.<br />
Sulfate value<br />
(%)<br />
37.5 20 0 – – – 0<br />
20 10 0 – – – 0<br />
10 6.3 26.4 303.2 278.2 8.2 2.18<br />
6.3 2 69.4 104.9 98.6 6.0 4.17<br />
2 1 4.2 † – – 6.0 ‡ 0.25<br />
Total 100 Total 6.60<br />
Second Test Portion<br />
37.5 20 0 – – – 0<br />
20 10 0 – – – 0<br />
10 6.3 28.7 296.1 272.3 8.0 2.31<br />
6.3 2 66.2 98.4 92.5 6.0 3.97<br />
2 1 5.1 104.1 98.2 5.7 0.29<br />
Total 100 Total 6.57<br />
Mean 7<br />
† Less than 5 % by mass <strong>of</strong> total sample, no test specimen.<br />
‡ Taken as equivalent to that <strong>for</strong> 6.3 mm to 2 mm size under sub-Clause A.6.2, indent (b).<br />
July 2008 31