In place surface recycling method is a method of heating existing surface course materials and re-mixing and then paving with them. This method offers an economical and rational way of pavement rehabilitation.
Merits are;
1. Economical: As existing asphalt mixtures are re-used, the use of new asphalt mixture is minimized.
2. Rapidity & Safety: As the construction work is finished with one pass of machines, decrease inconvenience to traffic and residents of roadsides in addition to safe construction work.
3. Improvement of quality: Surface geometrics and asphalt mixture of existing pavements are simultaneously improved.
4. Environment Preservation: No need of pavement wastes transportation and no need of wasting stock place. In addition, the problems of noise, vibration and dusts are minimized.
Where to use In Place Surface Recycling Method?
In Place Surface Recycling Method is an effective method when the damages of surface is light and when the only the surface course is damaged and binder course and base course are sound.
In detail, reference the table below.
|
Item |
Condition for
application |
Considerations for Application |
|
Average depth of existing asphalt concrete
layer (mm) |
50
or more |
The 20 mm depth from top of existing asphalt concrete should not be re-used. |
|
rutting
depth |
flow
(mm) |
50
or less |
Re-Pave type of recycling is applicable when the rutting by flow is not greater than 30 mm.
When applying Re-Mix type of recycling to sections where depth of rut caused by flow is greater than 30 mm, the bumped parts should be removed by milling prior to recycling works. |
|
Ravelling
(mm) |
30
or less |
Re-Pave type of recycling is permitted on condition that when the existing asphalt mixture meet the required quality, partial re-construction, milling, leveling are done if necessary prior to recycling word and finishing compaction are certainly and uniformly done without transverse difference. In this case, it is applicable to sections where the rutting depth is 70 mm or less. |
|
Ratio of Cracked Area
(%) |
40
or less |
Re-Pave type of recycling is applicable when the ratio of cracked area is 20 % or less.
At where locally damages are grown up to binder course or lower course, partial re-construction should be done in advance. |
|
Penetration of
old asphalt
(1/10mm) |
20
or more |
Re-Pave type of recycling is applicable when the penetration of old asphalt is not smaller than 30 |
There are Two Types selected depending on the purpose.
There are two types of In Place Recycling Method. One is Re-Mix type and the another is Re-Pave type. These are selected depending on the purpose of construction.
Type Flow of work Features
ReMix
Features:
By adding new asphalt mixture, comprehensive quality improvement of existing mixture is possible. In addition, geometrics of surface and increasing of pavement depth is simultaneously possible.
RePave
Features:
Nee mixtures are spread on recycled mixtures and they are simultaneously compacted, thus improve the geometrics of surface and increase the pavement depth. Moreover, by adding additive agent for recycling, old asphalts are renewed.
The Typical Equipments Configuration
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