For public works
INVOLVEMENT IN SUCCESSFUL WORK SITE
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Carrières du Boulonnais hard limestone (LA+MDE = 35) is highly resistant to shock and attrition allowing it to be accepted for the full pavement structure, notably the bedding and dressing of light traffic roads.
Its compatibility and ease of use are its major assets. |
Sand
| The sand used in public works are 0/4 mm, 0/6 mm subject to various granulometrics.
Ex : Dry sand 0/4 mm with 10 % fines |
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Gravel
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Dry gravel is mainly used in the underlayers of road structures.
Ex : Dry gravel 4/6 mm |
Unbound mixture road aggregates (GNT)
| Unbound mixture aggregates are most often used either:
- for road foundation and the bedding of public work platforms; or - for subbase course and road base layers. Ex : Unbound sand-gravel aggregate 0/31,5 mm |
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Embankments
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For maritime and river works, the different granulometries can be ranked in:
- 5/50 kg to 5/8 ton as and all-in ballast from from 0 to 1000 kg |
General characteristics of aggregates
Caractéristiques générales des granulats classés CIII a selon XP P8-545
General characteristics of aggregatesclass CIII according to XP P18-545
Nature :Massive, dense hard carbonate rock
Source: Visean basin of Bas Boulonnais
Compression failure : 140 to 200 MPa
Coefficient Los Angeles (LA) : 22
Coefficient Micro-Deval (MDE): 13
Water absorption ratio: < 1 %
Aggregate resistant to freezing - thawing
Volumetric weight : 2.7 T/m3
Compacted volumetric weight at
Proctor Optimum value for GNT : > 82 %
Bulk volumetric weight :
Sand 1.6 to 1.7 T/m3
gravel, pebbles and rocks : 1.4 to 1.5 T/m3
Cleanliness of sand: blue dye absorption test : MG < 1.5
Cleanliness of gravel : fines 63µ < 1.5 %
Gravel flattening ratio: < 15
Color : grey/beige