Final field measurements on the
trail sections for recycled concrete
and asphalt on the former
Fornebu Airport, Oslo
Workshop nr 2
Recycled materials in road and airfield pavements
Scandic Hotel KNA, 25 June 2005
Ragnar Bragstad, Asfaltteknisk institutt (ATI)
4
2
3
1 ref.
5
6
7
Wearing course 4,5 cm SMA
Binder course 3,5 cm AC
5 cm
reclaimed
asphalt
(0-30 mm)
8 cm
reclaimed
asphalt
(0-30 mm)
5 cm
reclaimed
asphalt
(0-30 mm)
16 cm of
mix of
reclaimed
asphalt
and
concrete
8 cm
reclaimed
asphalt
(0-30 mm)
20 cm of
crushed
concrete
(0-40 mm)
6 cm Bituminous Gravel
10 cm Bituminous opengraded
crushed stone
40 cm Coarse aggregate
(20-120 mm)
40 cm of
reclaimed
asphalt
(0-60 mm)
40 cm of
mix of
reclaimed
asphalt
and
concrete
40 cm of
crushed
concrete
(0-40 mm)
Back calculated E-modulus Base course
1200
E-modulus, MPa
1000
800
1999
2000
2001
2003
600
400
200
0
3
4
Section number/Base course
2
Plate loading test Base course
400
350
E-modul MN/m2
300
Section 3: 5 cm Ak/20 cm Bk
Section 4: 5 cm Ak/16 cm Ak/Bk
Section 2: 8 + 8 cm Ak
Ak: Crushed Asphalt
Bk: Crushed Concrete
250
200
150
100
50
0
E1 1999
E2 1999
E1 2003
E-moduler 1999 og 2003
E2 2003
Back calculated E-modulus, Sub-base
6000
E-modulus, MPa
5000
4000
1999
2000
2001
2003
3000
2000
1000
0
3
4
2
1
Test section nr
5
6
7
Plate loading test Sub-base
600
500
400
Section 1
Section 5
300
Section 6
Section 7
200
100
0
E1 (MPa) 1999
E2 (MPa) 1999
E1 (MPa) 2003
E2 (MPa) 2003
Conclusions
• The Plate loading test shows an increase in the
bearing capacity similar to the results from the
falling weight deflectometer.
– But not in the same magnitude and for the sub-base the
increase is bigger for the mix of crushed asphalt and
concrete than for crushed concrete alone.
• The results supports the possibility of using a
higher E-Modulus than the one found under
construction when designing road structures.