Overview
Colas offers a variety of seal solutions for both new constructions as well as maintenance applications. Below is a brief summary of the type of seals on offer.
Please note that any information provided below is based on typical application and you should still get a proper seal design done before for each specific application. The Colas team is available for any assistance you might require.
Sand Seals
Sand Seals are used for the surfacing of roads carrying very light traffic which is predominantly motor vehicles.These seals are not recommended for roads carrying more than 750 equivalent light vehicles/ lane/day. The bituminous road network in the Kruger National Park is exclusively surfaced in this way.
Single seals
Single seals play an important role in restoring the functionality of old, weathered surfacings.The greater the traffic volume, the larger the stone size that should be used.
|
Binder type |
Aggregate size (mm) |
|||
|
6,7 |
9,5 |
13,2 |
19,0 |
|
|
Binder application rate (l/m2) |
||||
|
70/100 pen. bitumen |
0,88 |
0,99 |
1,3 |
1,54 |
|
Cationic Spray Grade 65% |
1,20 |
1,4 |
1,85 |
2,15 |
|
Colflex S (S-E1) |
0,97 |
1,1 |
1,45 |
1,69 |
|
Colrub S (S-R1) |
– |
1,8 |
2,2 |
2,4 |
For more specific design requirements, contact the Colas Technical Department for assistance.
Double Seals
The double seal specification is widely used as a surfacing for newly constructed roads generally carrying from 125 to 40000 equivalent light vehicles per lane per day (ELV’s).
Typical application rates for light to medium traffic conditions using different binders:
Binder type: 70/100 penetration grade bitumen – spray temperature 150 to 175°C
|
Seal Type |
Tack coat (hot) – l/m2 |
Penetration coat (hot) – l/m2 |
Fog Spray l/m2 (50:50) |
|
13,2 mm + 6,7 mm |
1,0 |
1,1 |
0,8 |
|
19,0 mm + 9,5 mm |
1,1 |
1,4 |
0,8 |
|
19,0 mm + 6,7 mm |
1,1 |
1,2 |
0,8 |
Binder type: Cationic Spray Grade 65%/Rubspray 65% (SC-E1 or 2) – spray temperature 60 – 70 °C
|
Seal Type |
Tack coat (hot) – l/m2 |
Penetration coat (hot) – l/m2 |
Fog Spray l/m2 (50:50) |
|
13,2 mm + 6,7 mm |
1,2 |
1,4 |
0,8 |
|
19,0 mm + 9,5 mm |
Application rates unrealistically high for emulsions |
||
|
19,0 mm + 6,7 mm |
1,5 |
1,6 |
0,8 |
Binder type: Colflex S (S-E1 or S-E2) – spray temperature 175 to 185°C
|
Seal Type |
Tack coat (hot) – l/m2 |
Penetration coat (hot) – l/m2 |
Fog Spray l/m2 (50:50) |
|
13,2 mm + 6,7 mm |
1,1 |
1,2 |
0,8 |
|
19,0 mm + 9,5 mm |
1,2 |
1,5 |
0,8 |
|
19,0 mm + 6,7 mm |
1,2 |
1,4 |
0,8 |
Bitumen rubber (Colrub S) is always used in combination with other binders in the construction of double seals. The Colas Technical Department can recommend suitable combinations and application rates.
Triple Seals
This type of seal is generally used on the national routes when greater skid resistance and resistance to bleeding is a primary requirement. The seal can accommodate relatively high volumes of traffic (from 5000 to 40000 equivalent light vehicles/lane/day).
Please contact the Colas team for more information on triple seals
Cape Seals
This surfacing is suitable for roads carrying less than 10000 equivalent light vehicles/lane/day, such as secondary roads and suburban streets. The surfacing is also ideally suitable for construction of airfields, parking areas, playgrounds and areas subjected to the scuffing action of vehicle tyres.
Typical hot application rates appear in the table below binders:
|
Application |
70/100 |
Cationic Spray Grade 65% |
Slurry |
|
Tack Coat (l/m2) |
1,1 |
1,5 |
– |
|
13,2 mm aggregate (m3/m2) |
0,01 |
0,01 |
– |
|
Fog Spray (50:50) (l/m2) |
0,8 |
0,8 |
– |
|
Medium graded slurry (m3/m2) |
– |
– |
0,0036 – 0,006 |