CBR PLUS
CON-AID
CONCON-AID / CBR PLUS in Haul Roads
Haul roads forms an important part in the transport industry. They are
used mainly in opencast mining, forestry and sugarcane operations.
Haul trucks with tare of 60 tonnes and a payload of 150 tonnes are
commonly used in the opencast mining industry. While forestry and
sugar cane estates used logging- and fire fighting trucks in excess of 25
tonnes.
CON-AID has extensive experience in assisting in maintenance of haul
road projects.
SOME OF THE PROBLEMS:
Due to the size of the haul trucks used in the mining industry roads up
to 30 meters wide and more are required. Drainage and maintenance is
often difficult and costly.
The gooseneck of articulated haulers are very sensitive to unevenness
and roughness of the road and blade maintenance is continuously
required.
During dry seasons dust is the major problem contributing to driver
fatigue.
During rainy weather slipperiness and deformation becomes the major
problems creating loss of productivity.
Because of the high tyre pressure and heat generation by the wheels
normal bitumen seals are unsuitable and a natural soil or gravel surface
is accepted.
CON-AID / CBR PLUS – spray-on technique:
CON-AID / CBR PLUS has been successfully used on natural gravel roads
to reduce maintenance cost in:
•
•
•
Grading.
Minimizing application of water for dust preventions.
Increase production during rainy seasons.
Haul roads in the mining industry is designed and constructed
conventionally to carry abnormal loads.
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CBR PLUS
CON-AID
CON-AID / CBR PLUS is applied in small quantities on the surface by
using a water tanker normally used for dust control.
This surface treatment has
the following purposes:
•
•
CON-AID / CBR PLUS
reduce the amount of
dust produced by
vehicles, therefore
reduce the number of
water spraying
operations for
example from four
application per day to one per day.
After a relatively short period the road surface becomes more
negotiable during rainy weather, which results in less grading.
Grading is reduced on a road from ten times to one over a certain
period, thus result in maintenance cost savings.
It should be clearly understood that when heavy vehicles used a haul
road frequently such roads should be designed and constructed
according to engineering requirements. CON-AID / CBR PLUS can only
successfully used in the top layer.
In most cases where roads are being used the surface is reasonably
maintained and in fair condition. In such cases there is no need to
break up the surface to introduce CON-AID / CBR PLUS and the spray-on
technique may be used. Small amounts of CON-AID are put into the
water tanker when wetting the surface as for dust suppression. Normal
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CBR PLUS
CON-AID
procedure is CON-AID treated water one day followed by pure water
application the next day. This alternative spraying is continued until
the prescribed amount of CON-AID has been applied.
These remarks apply to existing roads with a sound substructure.
Below is a list of clients that has used CON-AID satisfactory.
1.
SASOL Coal Driehoek shaft
2.
HL&H Mining Timber Rosehaugh, Nelspruit
3.
Ubombo Ranches (sugar Estate) Swaziland
a.
b.
c.
d.
e.
Main Haulage to mill
Road width
Cain to mill
Sugar from mill
Coal, fertiliser & waste
15 km
10 m
1 800 000 tonnes
260 000 tonnes
40 000 tonnes
3
CBR PLUS
CON-AID
f. Busses
g. Light traffic
h. Maintenance
Re-gravel
Grade
4.
130 per day
900 per day
Untreated
Twice
10 times
Treated
None
2 times
Simunye Sugar Estates, Swaziland:
a. Main haulage
120 km
b. Cane
70 tonnes on 9 axles
170 loads per day
c. Other fertilizer, coal &
Light traffic
once every minute
d. aintenance
Untreated
Treated
Re-gravel
Every 3 months
none
Grade
Once a month
once
Before CON-AID
treatment
After three years
before sealing
After three years the roads was
sealed with money saved on
maintenance.
4
CBR PLUS
CON-AID
5.
Mondi Forests Renosterhoek, Sabie
Traffic Count
Average No per day
45 tonnes, 6 axles
20
25 tonnes, 4 axles
108
5 tonnes, 2 axles
16
1 tonne, 2 axles
84
A number of
products were
put down under
supervision of
The Council for
Scientific and
Industrial
Research
(CSIR). After 18
months Mondi
decided to use
CON-AID.
6.
Mondi Forests Ramanas
Mill:
Haul road to mill
No maintenance for 6 years
Many more roads for Mondi
Forests, such as
a. Doornlaagte Section 1
and 2
b. London Plantation, main
along NR3,
c. Grootfontein Plantation
7.
Mondi Warburton airstrip
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CBR PLUS
CON-AID
8.
SAPPI Forests Grootgeluk
9.
Tzaneen Wood from plantation to processing plants as well
as to rail station
6