Post on 01-Jan-2016
description
Condition Rating after Two Years
• Traffic loading
• Typical structural failures
• Rating by panel of twenty people which included designers, clients and researchers
• Recommendations and the way forward
Traffic Loading
• Design based on conventional design methods
• Intended to get failure within 6 months
• Cum. traffic loading to date (2.7 years)
380 000 E80’s versus 60 000 designed for
• Spread of heavy vehicle types and loading, including Volvo off-road dumpers (16 E80)
Traffic loading: Monthly Statistics
ROODEKRANS - MONTHLY STATISTICSwith Volvo dumpers since 1/9/2002
0
5000
10000
15000
20000
25000
Month
HV Axles E80
(From 12/3/2002)
Traffic loading: E80 per Heavy Vehicle
AVERAGE E80 PER HEAVY VEHICLE BY AXLE CLASS
Roodekrans, from 12 March 2002 till 31 October 2004; 92791 heavy vehiclesAverages: E80/HV = 4.106; E80/AL = 1.322; Axles/HV = 3.107
Number of axles on the heavy vehi cl e2 3 4 5 6 7 8 9
Av
e E
80 p
er
he
avy
ve
hic
le
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
1.241
5.046 5.047
6.406
4.403
0.908
0
2.864
Condition Rating by Panel
• Average area of sections: 50 square meters
• Percentage area of the section perceived as failed. One out of four panels failed = 25%
• Perception of the rater as a client/designer and as a road user
• The facility being used as a highway, street or hard standing (apron)
1. 75 SFRC on foam
2. 75 SFRC on CTS
3. 75 SFRC on ETB
4. 50 CRC on ETB/CTS
5. 75 CRC on ETB/CTS
6. 100 CRC on CTS
7. 100 butt joint. on CTS
8. 100 butt joint. on AC/CTS
9. 140 plain joint. on G5
10. 140 butt joint. on G5
11. 140 dowel on gravel on G5
1 2 3 4 5 6 7 8 9 10 11
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
Designer/Client
Road user
1. 75 SFRC on foam
2. 75 SFRC on CTS
3. 75 SFRC on ETB
4. 50 CRC on ETB/CTS
5. 75 CRC on ETB/CTS
6. 100 CRC on CTS
7. 100 butt joint. on CTS
8. 100 butt joint. on AC/CTS
9. 140 plain joint. on G5
10. 140 butt joint. on G5
11. 140 dowel on gravel on G5
1 2 3 4 5 6 7 8 9 10 11
Highway
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
Highway
Street
1. 75 SFRC on foam
2. 75 SFRC on CTS
3. 75 SFRC on ETB
4. 50 CRC on ETB/CTS
5. 75 CRC on ETB/CTS
6. 100 CRC on CTS
7. 100 butt joint. on CTS
8. 100 butt joint. on AC/CTS
9. 140 plain joint. on G5
10. 140 butt joint. on G5
11. 140 dowel on gravel on G5
1 2 3 4 5 6 7 8 9 10 11
Highway
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
Highway
Hardstanding
Recommendations and Way Forward
• Keep on monitoring
• Maintain where necessary
• Feedback into cncPave
• Apply knowledge elsewhere especially where slab support is relatively good, traffic loading is moderate and labour intensive construction is considered