MORTH_Rev_V

MORTH REV-5

Comparison with Rev-4

Embankment construction

LL – 70, PI – 45 LL – 50, PI – 25 Use of fly ash in

embankment as per IRC-SP:38, 2001

Rate includes transport of unsuitable excavated material for disposal with all lead and lifts

GSB

Close graded – 3 gradings

Coarse graded – 3 grading

6 – gradings III & IV for lower layer V & VI for drainage

layer

WMM

Grading : 75 mic – 0-8

Flakiness/ elongation indices

: 30%



: 35%

CRM



: 30%



: 35%

Bituminous layers

Binder : penetration grade

Binder : viscosity grade

Viscosity grade Bitumen:The new method of grading the product has now rested on the viscosity of the Bitumen (at 600C and 135 0C). The new grades have thus evolved with nomenclature:Grades Minimum of AbsoluteApproximate

viscosity, Poise@ 600Cpenetration grade

VG 10 800 80-100VG 20 1600 ------VG 30 2400 60-70VG 40 3200 30-40/40-50

Selection criteria for VG bitumen

Lowest daily mean air temperature

Highest daily mean air temperature

<20° C 20° C - 30° C >30° C

> -10° C VG-10 VG-20 VG-30

- 10° C or lower

VG-10 VG-10 VG-20

Profile correction course

Measurement Longitudinal : at every 10 m in

straight reach: at every 5 m in curves

Transverse : 7 points for two lanes: 5 points for single lane

Prime coat

Material Not specified

Rate of application(kg/10sqm) WMM/WBM : 6-9 kg Cement stabilized soil

base: 9-12 kg

Gravel base : 12-15 kg

Material : SS1 type emulsion

Rate of application(kg/10sqm) WMM/WBM: 7-10 kg Stabilised soil base and

CRM:

9 – 12 kg

Tack coat

Material Emulsion

Rate of application(kg/sqm)

Material : RS1/ VG 10 type

emulsion Rate of

application(kg/sqm) Bit. surface: 0.2-0.3 kg Primed surface: 0.25 –

0.30 kg CC pavement : 0.30 –

0.35 kg

BM

Flakiness/ Elongation – 30

Penetration grade35-90

Flakiness/ Elongation - 35

VG 30

DBM

Flakiness/ Elongation – 30

Penetration grade35-90

Nominal size Grade 1 : 40mm (50-

75mm) Grade 2 : 25mm (80-

100mm)

% air voids : 3-6

Flakiness/ Elongation - 35

VG 30 Nominal size

Grade 1 : 37.5mm (50-75mm)

Grade 2 : 26.5mm (75-100mm)

% air voids : 3-5 (preferably 4)

SDBC

SDBC item has been removed in MORTH Rev-V

BC

Single layer – 25 to 100mm

Nominal agg. size Grade 1 : 19mm (50-

65mm) Grade 2 : 13mm (30-

45mm) Binder (PG 65)

Grade 1 : 5-6 % Grade 2 : 5-7%

% air voids : 3-6

Single layer – 30/ 40/ 50mm

Nominal agg. size Grade 1 : 19mm

(50mm) Grade 2 : 13mm (30-

40mm) Binder (VG 30)

Grade 1 : 5.2 % Grade 2 : 5.4%

% air voids : 4

Lean CC Old grading

size % passing 26.50 100 19.00 80-100 9.5 55-75 4.75 35-60 600mic 10-

35 75mic 0-8

New gradingsize % passing

26.50 100 19.00 75-95 9.5 50-70 4.75 30-55 2.36 17-42 600mic 8-12 300mic 7-

173 150mic 2-12 75mic 0-10

MORTH_Rev_V

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