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> 3 Constituent Materials<br />
(NOTE. Increasing the thickness <strong>of</strong> a mat can<br />
considerably increase the time that it will take to cool to a<br />
temperature below which it cannot be effectively<br />
compacted. There<strong>for</strong>e, in adverse weather (high winds<br />
and/or cold temperatures), the use <strong>of</strong> a greater course<br />
thickness will increase the possibility <strong>of</strong> having sufficient<br />
time to complete compaction.)<br />
3.9 AGGREGATE SIZE<br />
The aggregate size shall be in accordance with<br />
Table 3.5 <strong>for</strong> the relevant combination <strong>of</strong> course<br />
type and nominal layer thickness.<br />
TABLE 3.5 NOMINAL LAYER THICKNESSES<br />
Course<br />
Surface<br />
Binder<br />
Regulating<br />
and<br />
Ramping<br />
Nominal Layer<br />
Thickness<br />
(mm)<br />
Aggregate<br />
Size<br />
(mm)<br />
20 – 30 (25 – 30) 0/6<br />
30 – 50 (30 – 40) 0/10<br />
35 – 60 (40 – 60) 0/14<br />
50 – 100 (50 – 75) 0/20<br />
0 – 25 0/4<br />
15 – 50 0/6<br />
20 – 50 0/10<br />
30 – 60 0/14<br />
45 – 100 0/20<br />
(NOTE. A second range in brackets indicates the range<br />
<strong>of</strong> nominal layer thickness expected to be used when<br />
there are no particular constraints on the selection.)<br />
July 2008 7
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