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MAINTENANCE OF RURAL ROADS

satander50@yahoo.co.in

Maintenance -

Regular work performed to upkeep:

� Pavement

� Shoulders

� Other facilities

� Provided for road users

� As nearly as possible in its constructed condition.

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

EVALUATION

• Core cutting

• Air content

• BBD,

• FWD

• GPR

• Thickness

• Profile

Maintenance of surface defects page 323

Bleeding Surface

Cracks

Rutting

Depression

Edge subsidence

Edge drainage

Pot holes5

Pressure Grouting of Cracks

Paver Block Campus Road

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

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

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

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

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

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

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%

SMOOTH SURFACE

Remedial

� Resurface with PMC/ SDBC

� Slurry seal

HUNGRY SURFACE

REMEDIAL

� Slurry seal (2-5 mm)

� Fog seal

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https://www.youtube.com/watch?v=SPf-V_41aZc

Fatty Surface

Remedial

� Application of cover agg., sand,

� OGPC, liquid seal coat,

� Burning, removal , mix design?

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

RUTTING

TREATMENT

� Filling –Bituminous M

� Remove and relay

� Stone Matrix asphalt (IRC SP79)

DISTRINTEGRATION- STRIPPING

REMEDIAL

� Hot (150oC) coarse sand spread, liquid seal coat.

� Remove bituminous mix and relay afresh.

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

EDGE BREAKING (FRAYED ADGES)

REMEDIAL

� Proper drainage

� 3-4% subgrade

� 3% camber- shoulder

� 2-3 % surface camber (8-10 mm down)

� Stepping/Overlapping

CONCLUSION

1. Maintain more roads means making more roads

2. Use Local Material/ Machinery

3. Repair Timely

4. Efficient drainage especially BC soil

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