7/25/2019 Block16 Soil Replacement Under Road-19.11.2010

1/2

Good afternoon,

I have some comments to the material for replacement under roads and the static circular plate

tests on the backfilling material on the block 16.

Because the suitable (approved) fill material on block 16 will be used for replacement of theunsuitable fill material under the roads on block 16 that means this material will be used into

the pits!. "herefore the tested material could be used for these purposes though the ratio

#def$%#def1 determined b& static circular plate test is more than $,'. But the confirmation of

required compaction is necessary. And some conditions have to be satisfied as well. "he

reuired conditions as follow

*or the same material with ratio #def$%#def1 + 2,5-3,5 (obtained b& static circular plate

teston the top of the backfill la&er of thickness -- or --mm) has to be confirmed

required degree of the compaction. It has to be tested the same material on the same

place with the same process of the compaction as the loading circular plate test was

performed ($.11. / 1$.11.$-1- on block 16). *or the determination of the degree of the

compaction the test b& diaphragm volumeter could be used, where the densit& of thecompacted material in situ will be obtained and afterwards the results of this test and

the results of the 0 test (proctor standard / laboratory test for the same material)

has to be compared. It is not necessar& to use diaphragm volumeter. It is possible to

use other methods for the determination of the degree of the compaction which is

available for the contractor. But the proctor standard test and the granulometric curve

has to be performed for this material as well.

"he reuired degree of the compaction for the replacement under the roadson the

block 16 / 2! "#(proctor standard test for the used material).

If the minimum degree of the compaction for this material will be confirm than it is

possible to use this material and the ratio till 2,' will be satisfactor& during works."his procedure is allowed 3ust for the tested material (it is not possible to approve the

higher ratio #def$%#def1for another not tested material).

It is necessar& to document the results of the proctor standard testing, granulometric

curve and frost susceptibilit& (we suppose it is one of the tested material / sample

signed G4-25$%1-) for tested material. 0lease let us know which material was used

for in situ testing.

"he tested and approved material (on block 16) could be used onl& for backfilling. It is

not suitable as a material into the embankments.

"he fill under the roads will be compacted in la&ers thickness 2--4'-- mm (it will be decided

according to used compactor). $he moisture of the used material has to be ma%imum &2! wopt (woptdetermined b& 0 / proctor standard test). "he degree of the compaction has

to be minimum 2! "#. But the upper part of the replaced soil thickness '-- mm belongs to

the active 7one of the road and therefore the minimum degree of the compaction has to be

'((! "# for this layer.8nd minimum )def2* +( "a at the top of the bacfill on the

formation level/as designed.

"he parameters and reuirements for the backfill material under the paving will be solved

separatel&

$he tested materials for bacfilling samples 0-(312'(,0-(313'(,0-(311'(, 0-

(315'(/

7/25/2019 Block16 Soil Replacement Under Road-19.11.2010

2/2

"he material signed as a sample G4-25$%1- is suitable for replacement under the

roads and is suitable for backfilling as well.

"he material signed as a sample G4-252%1- could be suitable for the backfilling if the

reuired degree of the compaction and #def$will be documented. 8nd please confirm

if the same sample was used for 0 (proctor standard) testing. "he results of the 0

test of sample G4-252%1- don9t correspond to the documented granulometric curve(0 material) / the woptfor this material seems to be too high (we would e:pect ;4

12< not 1