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Wednesday, 12 March 2014

Road Works General Specifications

A. Concrete

  • Max allowable temp for all types of concrete is 32 0 c.
  • Max allowable fall of pouring 1st 1.2 mts.
  • Max allowable slump 100+- 25 mm, water adding should not be allowed.
  • Max allowable time is 2hrs after batching
  • Normally ‘opc’ used for structural & src used for sub structures.
  • Normally types of mix a.40/20, b.30/20, c.25/20, d 20/20.: where ’40’ is compressive strength & 20 is the site of agg.

B. Wet mix

  • Minimum cbr should be 80 @ 100 % compaction.

C. Road base

  • Normally moisture content should be in between 4.5% to 6.5%.
  • Normal grading 70% agg (size = 5mm down) & 30% sand.
  • Agg used in wet mix : crushed & in road base natural.
  • Minimum compaction required is 98%

D. Prime coat

  • Average rate of application should be 0.8 to 1.2 kgs/sqm.
  • Temperature should be in between 600 c to 900 c curing time 48hrs.
  • Cut back asphalt mc =medium curing rc=rapid curing = sc=slow curing.

E. Tack coat

  • Average rate of application should be 0.15 to 0.35 kgs/sqm.
  • Temperature should be in between 100 c to 600 c.
  • Tack coat should be sprayed min 2hrs before laying aspahlt

G. Tiles

  1. Inter locking paving blocks:6cm thick for footpath:8cm for parking.
  2. Typical cross section shows:15cm=sub base,5cm coarse sand,6cm=tiles.
  3. First compaction after paving tiles,final after sand spreading..

H. Kerb stone

  1. Types upstand kerb,drop kerb,heel kerb,flush kerb(dimension varies)
  2. Fixing g.l.compacted 7cm con blind.fixed by mortar ,15cm con haunching.
  3. Pointing gap should be 4mm expansion joint should be at very 10mc.

I. Ducts

  1. All the services should be below 90cm from the frl(finish road level)
  2. Less than 90cm below frl,should be protected concrete production.
  3. Normal use :future or spare ductsplit duct,proposed duct
  4. Normally pvc & upvc pipes used for ducts,dla from 100mm to as required.
  5. Pipe lines :water =30cm to 60cm a/c irrigation =28cm pvc storm water=225mm .
  6. Mentral test & pressure tests conducted to confirm clear & lekage
  7. Test pressure shall be 1, 5 times the max working pressure & bar .
  8. Ducts above speci level shall be bedded & surrounded with 150mm con 15//20 .
  9. During backfill warning tape shall be installed over buried pipes.
  10. All ducts shall be provided std color drancord & std duct markers.
  11. Trench backfill shall be with appr mat & in 15cm compacted layers.

J. Safety measures:

  1. Trenches more than 1m deep shall protected with sheet piles (shoring) .
  2. Construction site should secured with cones, barrier & waring tapes.
  3. Temporary diversion sign boards, flash lights, should be installed.

K. Test a/c

  1. Marshal test (for stablity, flow, stifness, vim, vfb, vma) & core test (comp).
  2. Test for agg grading in asphalt also to find out bitumen content.(e/w)
  3. Mdd againest omc (proctor test) cbr field density (com) tests

L. Concrete

  1. Slump (workablity) test, test for compressive strength (by cubes).
  2. Paving blocks & kerb stones shall be tested for crushing value.

F. Asphalt

  1. Is a mixture of coarse aggregate, fine aggregate filler material & bitumen binder.
  2. Mix types /dense mix &stiff mix grad a.40/50 & b,60/70.
  3. Normal asphaltic layer thickness/b.c=80mm bi.c=60mm w.c =40mm.
  4. Normal aggregate/ Base Course =37mm & down binder .c=25mm & down wearing c =19mm & down.
  5. Required min compaction /b.c=97: bi c=97: w.c=98%.
  6. If compaction is more than 101.8% the asphalt should be rejected
  7. Allowable temp in asphalt

    1. surface temp before laying =18 0 min
    2. batching temp=1630c max
    3. laying temp=1350 c to 1630 min & max
    4. breakdown temp=1200 to 1400 c
    5. temp in joints should be 900 c min.
  8. In logitudinal joints 15cm over lap should be maintained.
  9. All logitudinal & transverse joints should cut vertical.
  10. Asphalt laying & rolling should be done from lower to upper.
  11. Asphalt should be laid max 1.50 m to get req tem in joints.
  12. Modified asphalt to increase stiffness 10 to 15% of chemcrete is mixed with bitumen while batching also to increase stability.
  13. Bleeding surface flow of bitumen (occurs due to over spray of tack coat) by placing hot mix over sprayed should be removed.
  14. Segregation / accumulation of agg. should replaced with fine mix
  15. To know no of passes required for of min comp, trail area 30mt to be prepared.
  16. Inspector to check during asphalt, segregation open texture tearing action using straight edge constantly, & tem regularly.
  17. Pot holes: less asphalt thin asphalt surface, poor drainage & ponding due to oil & diesel patches slippage cracks with form.
  18. Cracks can be repaired by, bitu- sealant, hot mix asphalt emulsion slurry.
  19. Camber = two side slope (nor1.5%) cross fall=one side slope(nor2%)
  20. In long & tran joints between layers 15cm offset is kept for good comp.
  21. While asphalt paving the speed of paver should be 4 to 6 km/min.
  22. Weight of STR (Steel Tandom Roller) should be in between 8 to 12 ton.
  23. Weight of PTR (Pneumatic Tyre Roller) should be 20 to 25 ton/ tyre pressure should be in between 6 to 6.3 kg/sqcm or 80 to 110 psi/
  24. Rollers speed should 5km/hr, should maintain overlap in passes/
  25. Staggered rolling should be done in passes, to avoid channeling/
  26. First & final rolling should be with STR & in middle with PTR.
  27. First to seal temp, final for smooth finish, PTR for inform comp.
  28. Veg oil lubrication used on PTR tyre ,should not be excess.
  29. While rolling at super elevation drive wheel should be forwarded, to avoid pushing of material.
  30. After 24 hrs re rolling is avoided design period will be reduced.
  31. Traffic should not be allowed min 7 days on fresh asphalt pavement.
  32. Transverse joints should be in min 50cm offsets for each line.
  33. FRL(finish road level) should be 15cm below the kerb stone
  34. Normal widths c.w=6m 7.3m & 11.5m p.p =2.5m d.p =5.5m s.w.=2.5m:mn=3m.
  35. Prime coat is sprayed over wet mix to seal the moisture content.
  36. Asphalt should layer 25% more to get req thickness after compaction.
  37. String line supported 10m interval pegs to get uniform levels.
  38. Joints should cut verticaly(900) toget proper compaction in joints.
  39. Asphalt leveling at joints should done careful to avoid jump & sag.

M. Miscellaneous

  1. Embankment should be in 15cm compacted layers approved material.
  2. CBR of exist mat should be 15.at formation level.
  3. Formation level should be compacted 95% and CBR should be 15%.
  4. Improved sub grade should be compacted 95% and CBR should be 30.
  5. Use of saline water. Should be avoided in Construction & compaction works.
  6. Before executing job trial trench's or pits to be excavated to find existing service.
  7. Construction area shall be checked with cable detector to locate the exist cables.
  8. Reference point for all levels shall be taken from standard bench mark.
  9. For trench where water table is high dewatering pump shall be used.
  10. Before laying pipe lines, 15cm sand bedding should be layed.
  11. Curing shall be done for min 7 days for all concrete work.
  12. For emergencies curing compound is allowed to proceed for further job.
  13. 25 mm grouting shall be done for base of storm water manhole.
  14. GRP liner shall be provided for all sewer manholes.
  15. Rock fill layer is used in road const, where the water table is high.

M. Equipment

  1. Earth work= grader, showel, back hoe, static roller & vibrator roller.
  2. Asphalt works= Paver, STR (Steel Tandom Roller) PTR (Pnuematic Tyre Roller).
  3. Others: transit mixer, spray tanker, bob cat, dumber, baby roller.
  4. Equipment used in asphalt should be without leakage of oil & diesel.
  5. All const works shall execute under: std spec limits & tolerances.

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