ROAD MAINTENANCE

GROUP MEMBER1.

Activities to keep pavement, shoulders, slopes, drainage facilities and all other

structures and property regularly

What is maintenance?

Three Catogarized of Maintenance

1. Routine2. Periodic3. Urgent

Routine

small-scale works conducted regularly…

activities include roadside clearing and grass cutting, cleaning of silted ditches

and culverts, patching, and pothole repair..

PeriodicThese operations tend to be large scale,

requiring specialized equipment and skilled personnel. They cost more than routine maintenance works and require specific

identification and planning for implementation and often even design…

Activities can be classified as preventive, resurfacing, overlay and pavement

reconstruction

URGENTundertaken for repairs that cannot be forseen but

require immediate attention such as collapsed culverts or landslides that block a road.

 

WHY MAINTENANCE IS IMPORTANT

1.Improve access to hospital,school and market

2.Lower vehicle operating cost ; Prevent from wear and tear

3. Improve comfort, speed and safety

TECHNIQUE OF MAINTENANCE

Recycle Technique

Refixation Technique

Surface make-up Technique

Resurfacing Technique

Reconstruction

RECONSTRUCTION

• Removing the old road and replacing or repairing the foundation layer

• This mean removing the surface layer as if resurfacing the road and digging out the layer below using excavator

• The advantages of reconstruction are can replace the surface, restores texture and grip, extends road life, restores road quality and creates it restores the structural layers of the road.

• The process involves in reconstruction is excavating the carriageway to about 500mm depth and replacing the materials with a new road structure.

 

THE ROAD CONSTRUCTION PROCCESS

1.Planning, programming and pre-construction activities.

2.Site clearance3.Setting out4.Earthwork5.Brick construction6.Drainage construction 7.Pavement construction8.Placement of road surfacing9.Placement of road furniture10.Landscaping

EARTHWORK

• Eventual of the earthwork phases of the construction is to position the subgrade underline the pavement layer in the right location and at the correct level and to provide drainage

• Largest task in the road building process and therefore carefully planning and organization are essential.

• Speed and efficiency depend very much upon the quality and type of earthmoving plant available.

PAVEMENT CONSTRUCTION

1. Gravel and Crushed Rock Pavement- Source : pits, quarries.- Haulage : trucks.- Spreading : grader or paver.- Compaction : higher compaction standard than subgrade different roller

types used.- Accuracy of levels important.  

   

2. Asphalt Pavements- Manufacture : fixed plants (up to 400 tonnes per hour) or large

mobile plants.- Haulage : trucks - Placement : paving machine - Compaction : rollers – smooth vibrating drum and pneumatic-tyred- Usually final layer thin to achieve good riding surface.

3. Cement Concrete Pavements- Manufacture : ready- mixed batching plant- Haulage : agitator truck- Large quantities : site manufacture + normal trucks- Placement : slip-form paver- Compaction : internal vibrators + external screeds