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Accelerated loading test in Danish Asphalt Rut Tester. Erik Nielsen Danish Road Institute. DART. Danish Asphalt Rut Tester is a full scale loading equipment capable of performing permanent deformation studies on bituminous bound pavement structures at a speed up till 5 km/h. - PowerPoint PPT Presentation
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Accelerated loading test in Danish Asphalt Rut Tester
Erik NielsenDanish Road Institute
2
DART
Danish Asphalt Rut Tester is a full scale loading equipment capable of performing permanent deformation studies on bituminous bound pavement structures at a speed up till 5 km/h.
The pavement slabs can be 1200 x 1500 mm in dimension and up till 250 mm in height.
The temperature can be controlled both at the top and the bottom of the slab, so stable gradient through the slab can be established to resemble the real conditions in the road.
3
DART
6 asphalt slabs have been retrieved from a Danish test pavement at Svogerslev.
4
DART
2 asphalt slabs have been retrieved from a test pavement at EPFL-LAVOC, Lausanne, Schweiz.
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DARTThe eight slabs will be divided in four sets a two slabs and the following experiments and associated conditions will be performed
Danish standard conditions
Temperature gradient 40 -> 20 C
Super single tyre, 50 KN
Danish test pavement
“EPFL-LAVOC” conditions
No temperature gradient 40 -> 40 C
Dual wheel, 45 KN
Danish test pavement
“EPFL-LAVOC” conditions
Temperature gradient 40 -> 20 C
Dual wheel, 45 KN
Danish test pavement
“EPFL-LAVOC” conditions
No temperature gradient 40 -> 40 C
Dual wheel, 45 KN
EPFL-LAVOC pavement
6
DART
First asphalt after DART experiment
Transversal profile = the mean of 5 measured profiles subtracted original transversal profile.
Rup depth = mean of 3 length profiles subtracted original length profile
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DART
0
5
10
15
0 20.000 40.000 60.000 80.000 100.000 120.000Number of runs
Ru
t d
epth
(m
m)
SS 109 SS 110 DW 111 DW 112
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DARTSuper single tyre, temperature gradient
-10,00
-8,00
-6,00
-4,00
-2,00
0,00
2,00
4,00
6,00
-1000 -800 -600 -400 -200 0 200 400 600 800 1000
Distance from centerline, mm
Tra
nsv
ersa
l pro
file
s, m
m
109 22.000 runs
109 80.000 runs
110 22.000 runs
110 80.000 runs
9
DARTDual wheel, no temperature gradient
-20,00
-15,00
-10,00
-5,00
0,00
5,00
10,00
15,00
20,00
25,00
30,00
-1000 -800 -600 -400 -200 0 200 400 600 800 1000
Distance from centerline, mm
Tra
nsv
ersa
l pro
file
s, m
m
111 22.000 runs
111 80.000 runs
10
DARTDual wheel, no temperature gradient
-20,00
-15,00
-10,00
-5,00
0,00
5,00
10,00
15,00
20,00
25,00
30,00
-1000 -800 -600 -400 -200 0 200 400 600 800 1000
Distance from centerline, mm
Tra
nsv
ersa
l p
rofi
les,
mm
111 22.000 runs
111 52.000 runs
111 54.000 runs
111 56.000 runs
111 80.000 runs
11
DARTDual wheel, no temperature gradient
focus on shift in material near centerline
-16,00
-14,00
-12,00
-10,00
-8,00
-6,00
-4,00
-2,00
0,00
-250 -200 -150 -100 -50 0 50 100 150 200 250
Distance from centerline, mm
Tra
nsv
ersa
l pro
file
s, m
m
111 22.000 runs
111 52.000 runs
111 54.000 runs
111 56.000 runs
111 80.000 runs
12
DARTSuper single tyre and dual wheel, with and without temperature gradient
-20,00
-15,00
-10,00
-5,00
0,00
5,00
10,00
15,00
20,00
25,00
30,00
-1000 -800 -600 -400 -200 0 200 400 600 800 1000
Distance from centerline, mm
Tra
nsv
ersa
l pro
file
s, m
m
109 22.000 runs
109 80.000 runs
110 22.000 runs
110 80.000 runs
111 22.000 runs
111 80.000 runs
13
DART
y = 0,0926x0,3715
R2 = 0,9935
0
1
2
3
4
5
6
7
0 20.000 40.000 60.000 80.000 100.000
Serie1
Serie2
Potens (Serie1)
No A B R2
109 0.2916 0.2768 0.9964
110 0.0926 0.3715 0.9935
111 0.0788 0.4430 0.9776
112 0.0259 0.5332 0.9311
Rut depth = A * Number of runs B
for runs from 10.000 -
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DART
