Cracks A continuation of the previous article on
Cause Damage highway, at this time the dish is described in more detail about the type of flexible pavement damage contained in the Road Maintenance Manual No.: 03/MN/B/1983 issued by the Directorate General of Highways of the Republic of Indonesia, road damage can be distinguished: 1.
Cracks (cracking)2. Distortion (distortion) 3. Disability surface (disintegration) 4. Wear (polished aggregate) 5. Overweight (bleeding or flushing) 6. Decline in plantings former utility (utility cut depression)
Fracture and cause Cracks that occur on the road surface layer can be divided into:
Cracked {alligator alligator cracks), slit width greater than or equal to 3 mm. Stringing each other to form a series of small boxes that resemble crocodile skin. to broaden, with all due respect is welcome to read the article the most heat, before:
Causes damage to highway This cracking is caused by
- poor pavement materials,
- surface weathering,
- subgrade or pavement section below the surface layer is less stable, or foundation layer materials in the saturated state of water (groundwater well).
Alligator cracking damage is generally not extensive. If the damage is extensive alligator cracking, is caused by the repetition of traffic loads that exceed the load. Alligator cracking for a while can be maintained by using layers of burda, burtu, or lataston, if gap <3 mm. Pavement section that should have experienced alligator cracking due to water seeped into the foundation and subgrade layers improved by dismantled and discard the parts wet, then coated again with the appropriate material. Improvements must be accompanied by improved drainage around it. Damage caused by traffic load should be improved by providing additional layers. Alligator cracking can be permeated by water so that over time will cause the holes due to the release of the grains.
Cracks smooth (hair cracking), slit width less than or equal to 3 mm, the cause is
- poor pavement materials,
- subgrade or pavement section below the surface layer is less stable.
This fine cracks can absorb water into the surface layer. Layers can be used for maintenance latasir, or free-range. In the refinement stage should be equipped with a drainage system improvements. Hairline cracks can develop into alligator cracking.
Cracks connection path (lane joint cracks), longitudinal cracks that occur in connection 2 lanes of traffic. This is due not baikny a connection bonding the two lanes. Repairs can be done by incorporating a mixture of liquid asphalt and sand into the gaps that occur. If not corrected, could develop into wide cracks due to the release of the grains at the edge of the crack and the water seep into the layers
Cracked pavement and shoulder joint (the joint edge cracks), longitudinal cracks that commonly occur in connection with the pavement shoulder. Cracks can be caused by drainage under the road shoulder is worse than under the pavement, the settlement on the shoulder of the road, depreciation shoulder or pavement material, or due to the trajectory of truck / heavy vehicle on the shoulder of the road. Repairs can be done as a reflection crack repair ..
Cracks connection road widening (widening cracks), is a longitudinal crack occurred on the connection between the old pavement with pavement widening. This is due to the differences below the carrying capacity and widening the existing road section, can also be caused by the bond between the connection was not good. Repairs carried out by filling the gaps that arise with liquid asphalt mixtures with sand. If not repaired, water can seep into the pavement layers through the cracks, loose grains and cracks can grow large. Figure 8.5. Cracks connection road widening (widening cracks)
Cracked shrinkage (shrinkage cracks), interconnected cracks forming large boxes with sharp corners. Cracks caused by changes in the volume of asphalt wearing surface layer with low penetration, or change the volume on the foundation and subgrade layers. Repairs can be done by filling the gap with liquid asphalt and sand mixture and coat with burtu. Crack slippage (slippage cracks), cracked the curved like a crescent moon shape. This happens due to the lack of good bonding between the surface layer by layer underneath. Less good bonding can be caused by the presence of dust, oil, water, or objects other non-adhesive, or as a result of not given the tack coat as a binder between the two layers. Cracks can also occur due to slippage terlau sand in the surface mixed layer, or lack of good compaction of the surface layer. Repairs can be done by dismantling the damaged section and replace it with a better coating.
Cracked reflection (reflection cracks), longitudinal cracking, transverse, diagonal, or forming box. Occurs on an overlay (overlay) which describes the pattern of cracks underneath. Reflection cracking can occur if the cracks in the old pavement is not properly repaired prior to overlay the job done. Reflection cracking can also occur if the vertical movement / horozontal under additional layers as a result of changes in the water content of expansive soils. For longitudinal cracks, transverse, and digonal repairs can be done by filling the gap with a mixture of liquid asphalt and sand. For a box-shaped crack repair done by dismantling and re-layering the appropriate material. Thank you, see you again and wait for the next show is still strongly associated with
Cracks, namely:
Distortion always healthy and cheerful greetings
