Geoscience Reference
In-Depth Information
a guide only. A movement sensitive building would require a higher level of
compaction, than a less sensitive building such as a steel framed industrial building.
•
When the percentage of gravel sizes (
200mm) exceeds 15%, and the percentage
of cobble sizes (60mm) exceeds 30%, then use a method specification.
>
•
Method specifications require the type and weight of roller to be defined with the
number of passes and the lift thickness.
12.15 Comparison of relative compaction and relative density
•
The relative compaction applies to material with some fines content.
•
The relative density applies to material that is predominantly granular.
Table 12.15
Approximation of relative density to relative compaction (Lee
and Singh, 1971).
Granular consistency
Relative density
Relative compaction
Very dense
100
100
90
98
80
96
Dense
70
94
60
92
Medium
50
98
40
88
Loose
30
86
20
84
Very loose
10
82
0
80
12.16 Field characteristics of materials used in earthworks
•
Different material types are required depending on the application.
•
Table 12.16 provides the typical field characteristics for different materials.
12.17 Typical compaction characteristics of materials used
in earthworks
•
Table 12.17 provides a guide to the use of different materials in a method
specifications.
•
Thickness of compacted layers depends on type of plant used.
•
Different plant types would need to be used for different materials and operating
room.
12.18 Suitability of compaction plant
•
Effective compaction requires consideration of the type of plant, materials being
compacted and environment. Refer Table 12.18.
•
Tamping rollers includes sheepsfoot and pad rollers.
Search WWH ::
Custom Search