portorož, slovenia slovenia, its roads and its expertise bojan lebenbojan leben nk piarc...
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Portorož, Slovenia
Slovenia, its roads and its expertise
•Bojan LebenBojan Leben
•NK PIARC SlovenijaNK PIARC Slovenija
•Chairman NK PIARC SlovenijaChairman NK PIARC Slovenija
•[email protected]@zag.si
Portorož, Slovenia
Slovenia’s roads
o Slovenia’s roads are managed by• the Slovenian Roads Agency, • the Motorway Company in the Republic of Slovenia DARS and • local municipalities
o The condition of pavements has been regularly assessed on the state road network (main and regional roads) for more than 15 years
o On motorways from 2005 every second year
Portorož, Slovenia
Slovenian Roads Agency and DARS
o Almost 6,000 km of national roads
o The National Motorway Construction Programme (NMCP)
o The completion and improvement of motorways and other roads in mainly two directions: East to West, North to South
o Nearly 660 km when NMCP completed
Portorož, Slovenia
Pavement monitoring
The register of public roads is maintained in accordance with the Public Roads Act since 1954
o longitudinal evenness,o transverse evenness,o skid resistance,o surface defects,o bearing capacity of the pavement structure
Portorož, Slovenia
Longitudinal unevenness ZAG-VP
Portorož, Slovenia
Longitudinal unevenness
o In the case of pavement management, the IRI (International Roughness Index) is calculated,
o In the case of quality control, both the irregularities under 4 m straight-edge and the IRI Index are calculated from measured profile
o Criteria for evaluating road condition on the motorway network are defined in the so-called Technical Specifications for Roads
o These criteria were prepared for measurements on in-service roads, newly constructed roads, and after the warranty period of 5 years.
Portorož, Slovenia
Longitudinal unevenness
o Financial penalties introduced for motorways construction in 2004
o TP = (0,65 x (FD for H4m)) + (0,30 x (FD for IRI20m)) + (0,05 x (FD for IRI100m))
Portorož, Slovenia
Longitudinal unevenness
DISTRIBUTION OF IRI VALUES
0.03%
1.20%
5.13%
8.92%
10.37%10.69%
9.10%
9.64%
7.38%
6.11%5.73%
5.16%
4.54%
3.22%
1.97%
0.46%
2.65%
2.51%
1.09%1.15%
0.10%
0.13%0.20%
0.29% 0.25%
0.72%0.76%
0.37%
0%
1%
2%
3%
4%
5%
6%
7%
8%
9%
10%
11%
12%
0.6 1.2 1.8 2.4 3.0 3.6 4.2 4.8 5.4 6.0 6.6
IRI
Per
cent
age
Distribution of IRI values for the national roads of Slovenia, in 2004
Portorož, Slovenia
QA/QC – Newly constructed road sections
Values for IRI 20m Traffic volume and load Limit Upper limit
High 2,0 2,6 Low 4,0 4,6
Values for IRI 100m Traffic volume
and load Limit Upper limit High 1,2 1,8 Low 2,0 2,8
Portorož, Slovenia
Skid resistance – Slovenian SCRIMTEX
Portorož, Slovenia
Skid resistance
Device has been upgraded
o More information about the vertical load• Additional load-cell has been installed
o Recording the radii of curvature during measurements• Inductive transducer on the steering mechanism
Portorož, Slovenia
Skid resistance
Skid resistance on main roads G1 and G2
46%55%
17%
15%
18%13%
13% 11%
6%6%
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
G1 G2
Road category
Per
cen
tag
e
Very good Good Fair Poor Very poor
Portorož, Slovenia
QA/QC – Acceptance criteria
Measuring speed (km/h)
Upper limit (SR)
30 62 40 57 50 53 60 49 70 46 80 43 90 40
Portorož, Slovenia
Surface defects
o Visual pavement condition evaluation according to the “Modified Swiss Index” methodology
o Surface defects:• cracking• ravelling• potholes• patching
Severity of the distress (Sm)
Affected area (Am)
o Weights (Gm)•0,4•0,3•0,1•0,2
p
cmmmm ASGMSI
Portorož, Slovenia
Surface defects
o The condition classes are named after the condition of the pavement• Very good• Good• Fair• Poor• Very poor
o The ranges of the condition classes depend on the Average Annual Daily Traffic (AADT).
Portorož, Slovenia
Surface defects
Percentage of length after visual pavement distress evaluation
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
HC G1 G2 R1 R2 R3 RT TogetherG+R
TogetherMotorwaysRoad cathegory
Per
centa
ge
of
length
[%
]
_
Very poor Poor Fair Good Very good
Portorož, Slovenia
Bearing capacity – Slovenian FWD
Portorož, Slovenia
Bearing capacity
o Measured only on Slovenia's main and regional road network
o 1 measurement per every 200 metres o Each year one-quarter of the road network o Condition of pavement structures is expressed by
means of the residual pavement life
Portorož, Slovenia
Bearing capacity
Traffic loading ESAL 82kN in one way
Very heavy
Very heavy
Heavy
Heavy
Medium
Light
Very light
Extremely heavy
Medium
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Motorways [km] G+R [km]
Perc
enta
ge o
f len
gth
.
Percentage of length after bearing capacity measurements
0%
20%
40%
60%
80%
100%
HC G1 G2 R1 R2 R3 RT TogetherG+RRoad cathegory
Per
centa
ge
of
length
[%
]
_
Very poor Poor Fair Good Very good
Portorož, Slovenia
Slippery pavements in tunnels
o Significantly larger number of accidents due to slips in tunnels, especially of cargo vehicles
o Low skid resistance and texture depth
o The design speed of 100 km/h
Portorož, Slovenia
Slippery pavements in tunnels
o Analysis of traffic loads • the results of the analysis indicated an annual traffic
loading growth rate of 16.2% (determined over the period 2002-2006)
• expected life of 20 years was actually reached after just three years
Portorož, Slovenia
Slippery pavements in tunnels
o Road surface treatments • shot blasting• water blasting• bush hammering• rough diamond grinding (rough milling)• fine diamond grinding (fine milling)
Portorož, Slovenia
Slippery pavements in tunnels
Portorož, Slovenia
Slippery pavements in tunnels
Portorož, Slovenia
Slippery pavements in tunnels
o Periodical skid resistance and texture measurements to verify the durability of the works carried out
o Maintenance and cleaning of the retextured pavement surfaces • more powerful cleaning equipment should be purchased,
which would make it possible to clean the pavement surfaces at a higher pressure
Portorož, Slovenia
Thank you for your attention