MAINTENANCE OF RURAL ROADS · 2017-07-05 · Liquid Seal Coat for, stripping, ravelling , heavy...
Transcript of MAINTENANCE OF RURAL ROADS · 2017-07-05 · Liquid Seal Coat for, stripping, ravelling , heavy...
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Maintenance -
Regular work performed to upkeep:
� Pavement
� Shoulders
� Other facilities
� Provided for road users
� As nearly as possible in its constructed condition.
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MAINTENANCE REQUIRED FOR:
• For safe passage of traffic
• Cut excessive time of travel
• Defer untimely rehabilitation
• IRC:82- Flexible• IRC:SP100-2104 Cold Mix
• IRC:SP-83- Rigid• IRC:SP:35- Box culverts
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EVALUATION
• Core cutting
• Air content
• BBD,
• FWD
• GPR
• Thickness
• Profile
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Maintenance of surface defects page 323
Bleeding Surface
Cracks
Rutting
Depression
Edge subsidence
Edge drainage
Pot holes5
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Pressure Grouting of Cracks
Paver Block Campus Road
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Untreated roads
� Periodic inspection/assessment of defects -3 months
� Unsealed roads – earth, gravel, WBM roads
� Upgraded/ same material/Dust proof Ca Cl2.
� Timely removal of loose material upto firm base & stabilize
� Life of road should increase
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Cross drainage repair� Reshaping
� Deepening of ditches
� De-silting
� Clearing of debris
� Erosion control
� Repair of approaches 9
IRC:SP:20IRC:SP : 13
Minimum Vent Height 1.5 m
Pipe Culvert NP 3 = 1.0 m
W= 4.25 m
M 25 RCC
L return wall = 1.5 time H Embank.
L = 1.5 times H
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Inadequate compaction leads to:
� Early oxidation,
� Ravelling,
� Cracking
� Disintegration
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Low Severity Fatigue Cracking
Fog seal for cracks < 3 mm
3004.3.2
Compressed air
Scrubber
0.7 litre/sqm
Pressure tank/spraying
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FOG SEAL
COMPOSITION
(IRC: SP:20 p317/ MORTH / IRC:SP:100)
� Slow setting asphalt emulsion.
� Emulsion (SS) is diluted with equal amount of water 1:1/Diluted SS2
� Sprayed @0.5-1 l/sqm on old pavement
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APPLICATION OF FOG SEAL :
� to increase binder content
� rejuvenate oxidized surface
� prevent ravelling
� hungry surface
� Rejuvenating emulsion has oils that helps in softening of oxidized binder
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Moderate Severity Fatigue Cracking
Crack filling
3 -6 mm
Compressed air
Scrubber
First Dust passing 2.36 mm,
75 µ 10%
Then slow curing bitumen
� Rapid cure (RC) (Naphtha or Gasoline)
� Tack coats, surface treatments
� Medium cure (MC) (Kerosene)
� Stockpile patching mix
� Slow cure (SC) (Low viscosity oil)
� Prime coat, dust control
MORTH 3004.3.3
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Distresses in Flexible Pavements
High Severity Spalled Fatigue Cracking
For 6 mm to 10 mm
• Dust
• bitumen mix
• Patch repair
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Depression
Remedies
� Small irregularities:= filling in of irregularities,
� Large irregularities together with cracks =
� Local restoration of the pavement surface
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Recycling or new Construction
Distress > 25%
Overlay Distress < 25%
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Longitudinal/ transverse Fatigue Cracking
Clause 501.7 MORTH
Off sett 300 mm Longitudinal.
Off Sett 2 m transverse
Overlap 25 to 50 mm
Heating of joint/Existing
Sealing with RC Emulsion
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Liquid Seal Coat for, stripping, ravelling, heavy rain fall
Composition
� Application of a layer ofbinder (Penetration grade oran emulsion bitumen)covering with aggregate.
� Emulsion RS 10-15 kg/10m2
� Bitumen� @ 9.8 kg /10 sq. m. T-A� @6.8 T-B
� Cover agg. Nominal size 6.3mm (10-2.36 mm)
� 0.09 cu m per 10 sq ,m.
REMEDIAL
� Dry - penetration grade
� Dampened – emulsion
� Spray with nozzle
� Temp/ rate
� Traffic after 4-6 hr
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SLURRY SEAL Clause 512 p 207
Application
� Fill cracks
� hair line- 4.3-6.5 kg/m2
� cracks 1-3 mm, 8.4 - 9.8 ,,
� Cracks 3 - 6 mm 10.1 - 12 ,,
� Ravelled
� Smooth
� Hungry
� Provide skid resistance
COMPOSITION
� Agg (2.36 mm) 68-72%
� 10 % 75 µ
� SS. emulsion 6.5-16%
� Water 10-12%
� Filler OPC 0.5-2%
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SMOOTH SURFACE
Remedial
� Resurface with PMC/ SDBC
� Slurry seal
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HUNGRY SURFACE
REMEDIAL
� Slurry seal (2-5 mm)
� Fog seal
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https://www.youtube.com/watch?v=SPf-V_41aZc
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Fatty Surface
Remedial
� Application of cover agg., sand,
� OGPC, liquid seal coat,
� Burning, removal , mix design?
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Bleeding
Too much binderUnsuitable binder
Clause 3004.4 : Dusting
i) 2.36 mm Agg
ii) 10% 75 µ
iii) 2.5 kg dust /sq m
iv) Instead of higher binder, 30/40 bitumen or PMB NOT CRMB
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RUTTING
TREATMENT
� Filling –Bituminous M
� Remove and relay
� Stone Matrix asphalt (IRC SP79)
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DISTRINTEGRATION- STRIPPING
REMEDIAL
� Hot (150oC) coarse sand spread, liquid seal coat.
� Remove bituminous mix and relay afresh.
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Raveling
REMEDIAL
� Application of emulsion, cut back with coarse sand,
� Slurry seal coat
� Renewal coat - pre mix material for heavy failure.
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Remedial - Potholes Clause 3004.2.2
• Removal of failed material
• Trimming Vertical faces
• Upto layer depth
• Tack coat - all faces
• Placing, compaction
• Finishing of patch material
• Emulsified/modified bitumen
• Sealed boundary
• 3 m st edge
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EDGE BREAKING (FRAYED ADGES)
REMEDIAL
� Proper drainage
� 3-4% subgrade
� 3% camber- shoulder
� 2-3 % surface camber (8-10 mm down)
� Stepping/Overlapping
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CONCLUSION
1. Maintain more roads means making more roads
2. Use Local Material/ Machinery
3. Repair Timely
4. Efficient drainage especially BC soil
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Don't
walk in front of me,
I may not follow.
Don't walk behind me,
I may not lead.
Walk beside me and
be my friend.
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� Asphaltenes: Solid inclusions High viscosity component (black)
� Resins- Semi-solid: i) Fluid when heated ii) Brittle when cold
� Oils - Soluble in most solvents
Components of Asphalt