Compaction requirements

 
Compaction requirements

Soil compaction in connection with installing BIO-BLOK® elements


Generally speaking, the excavated soil could be reused as surrounding and backfilling material, since both friction and cohesive soil can be used. Cohesive soil will usually lead to larger settlements than friction soil. The stone content in the surrounding and filling material may lead to point deformations. If the excavated material fulfils the following requirements and those laid down for compaction, the material can be used for refilling. We recommend that tight supervision be carried out during this installation phase.

Compaction of natural soil
Natural soil must be integrated/compacted according to the following average requirements laid down for at least three tests, and no individual values must be less than 3% below the average requirement.

   

Control Method

    Isotope method Sand refilling
a)  Natural soil level below natural soil fill 92 % S. P. 94 % S. P.
b)  Natural soil level below sand fill 95 % S. P. 97 % S. P.
c) Natural soil level below bottom protection gravel 96 % S. P. 98 % S. P.
d) Natural soil filling in ground 92 % S. P. 94 % S. P.
e) Natural soil filling in road embankment –
depth > 2 m
92 % S. P. 94 % S. P.
f) Natural soil filling in road embankment –
depth ≤ 2 m
92 % S. P. 94 % S. P.

Reference value set by Standard Proctor (S.P.) tests carried out in laboratories.

Compaction of sand fill
Sand fill must be integrated/compacted to the following average requirements laid down for at least three tests. No individual values must be less than 3% below the average requirement.

  Control Method
Isotope method Sand refilling
a)  Sand fill in installation trench/installation excavation in ground 93 % S. P. 95 % S. P.
b)  Sand fill in installation trench/installation excavation in surface areas –
light traffic (cycle path/pavement, etc.)
95 % S. P. 97 % S. P.
c) Sand fill in installation trench/installation excavation in surface areas –
Heavy traffic (roads)
98 % S. P. 100 % S. P.
d) Sand fill in surface areas –
light traffic (pavements, cycle paths, etc.)
95 % S. P. 97 % S. P.
e) Sand fill in surface areas –
heavy traffic (roads)
98 % S. P. 100 % S. P.
f) Sand fill for sand cushion foundation
(supporting walls)
98 % S. P. 100 % S. P.
g) Sand fill in building areas –
light flooring (residential development)
96 % S.P. 98 % S.P.
h) Sand fill in building areas –
heavy flooring (industrial development)
98 % S.P. 100 % S.P.
i) Sand fill outside building areas 93 % S.P. 95 % S.P.

Reference value set by Standard Proctor (S.P.) tests carried out in laboratories.


Compaction of bottom protection gravel
Bottom protection gravel must be integrated/compacted to the following average requirements laid down for at least three tests. No individual values must be less than 3% below the average requirement.

  Kontrolmetode
Isotopmetode Sandefterfyldning
a)  Bundsikringsgrus under belægninger – 
let tryk (fortove/cykelstier m.m.)
95 % S. P. 97 % S. P.
b)  Bundsikringsgrus under belægninger – 
tung trafik (veje)
95 % S. P. 97 % S. P.

Referenceværdi fastsættes ved Standard Proctor (S.P.) forsøg bestemt på laboratorium.


Compaction of stable gravel
Stable gravel must be integrated/compacted to the following average requirements laid down for at least three tests. No individual values must be less than 2% below the average requirement.


  Control Method
Isotope method Sand refilling
a)  Stable gravel on roads in construction sites 93% M. P. 96% M. P.
b)  Stable gravel under surfaces –
light pressure (pavements, cycle paths, etc.)
92% M. P. 95% M. P.
c) Stable gravel under surfaces –
heavy pressure (pavements/cycle paths, etc.)
94% M.P. 97% M.P.

Reference value set by Standard Proctor (S.P.) tests carried out in laboratories.

 

Reinforced excavation
EXPO-NET has prepared an example of how to reinforce an excavation.

To see the example, click on the icon below.

Klik her


Source for text regarding compaction:
The Danish Road Directorate standards