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Road Note 29 (RN-29)

Road Note No. 29 was frst published in 1960 t

guide

to the structural design o roads carrying mheavytrac.

!he 196" revision widened the scope to inctrac#ed roads$ such as those used in housing esta

%r &. '. !hompson o the Road Research (aboratoo the )nvironment introduced the !hird )dition o-leible &avement 'esign %ethods/ &repared by Raesh

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3n 19+0$ !he !ransport and Road Research (aboratin 4ritain published a design manual or newconstruction called 5Road Note 29.

'esign is based on 74R value.

!he thic#ness o the subbase is related to the 74Rthe subgrade and to the total number o standard a

!he thic#nesses o the other layers are related to

o the materials in the pavement itsel as well as tloading by a series o curves.

!he design charts and tables contained in Road Nderived rom the results o the !RR(:s many ulltests under 4ritish conditions o climate$ materloading etc. -leible &avement 'esign %ethods/ &repared by Raesh

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Trafc Analysis

-or the purpose o structural design$ the loads private cars do not contribute signifcantly to th

damage caused to road pavements by trac.

!hereore$ only the number o commercial vehicleale;loadings are considered.

Normally$ the heavy commercial vehicles operoutermost lane *the slow lane,.

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Trafc Analysis

7onversion actors to be used to obtain the euivao standard ales rom the number o commercial ve

.

Table 1

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Thickness Design o Pavementtr!ct!re

Road Note 29 presented the charts or determining t

thic#ness o various layers o pavement structure.

!he main actors used in the design are the cumulativstandard ales$ subgrade 74R and type o materials e

?ter determining the trac and design period$ the ssubbase$ the base and the surace are each considered

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!"grade

!he strength o the subgrade is a principal actor in det

thic#ness o the pavement.

!he strength o the subgrade is assessed on the 74R sc

Road Note 29 recommended that the water table

prevented rom rising to within 600 mm o the fnishlevel.

!his may be done by sub;soil drainage or by raising subgrade level by means o an emban#ment.

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!he reuired thic#ness o subbase is determinecumulative number o standard ales to be carried o the subgrade using -ig 1.

3n the case that 74R o the subgrade is less thalowest value given in -ig 1,$ an additional 1"0 mmabove the reuirement or 74R 2 @$ should be used

-or cumulative trac o less than 0." million stathe minimum 74R o the subbase should be 20 @.

-or cumulative trac in ecess o 0." million stan

the minimum 74R o the subbase should be =0 @.-leible &avement 'esign %ethods/ &repared by Raesh had#a$ acem21116

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Fig. 1:21116

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3 the 74R o the subgrade is in ecess o threuirement or the subbase$ no subbase is reuire

Chere subbase is reuired the minimum thicshould be laid are B0 mm where the cumulative tthan 0." million standard ales and 1"0 mm whereis in ecess o that value.

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#ase $aterials as Recommended "yRoad Note 29

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#ase

!he thic#nesses reuired or each o the base m

determined by the use o -ig 2 or -ig = or -ig.> $ cumulative number o standard ales to be carried.

!o use the charts$ it should be noticed the diDerenc

and ?merican terminology.

5Roadbase would be 54ase course in ?me54asecourse would be 54inder course.

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Fig. 2:21116

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Fig. 3:

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Fig. 4:-leible &avement 'esign %ethods/ &repared by Raesh had#a$

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!racing %o!rse !he thic#ness o suracing in terms o the cumulative number o standard a

can be determined by -ig. 2$ -ig. = and -ig. > depending on the type o base

Road Note 29 recommended the suracing course material to be varied withtrac to be carried and the details are given in !able 2.

!he suracing is intended to be laid in two courses$ ecept where the cumless than 0." million standard ales.

!he thic#nesses o suracing course are indicated in !able 2.

-or cumulative trac o over 11 million standard ales the minimum thiccourse plus binder course is 100 mm.

-or additional suracing thic#ness over 100 mm shown in -ig. 2$ -ig. = and -ig-leible &avement 'esign %ethods/ &repared by Raesh had#a$

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Fig. 2:-leible &avement 'esign %ethods/ &repared by Raesh had#a$

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Fig.2:

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Fig.

4:

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Recommendation or #it!mino!s !racing in Road

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Recommendation or #it!mino!s !racing in Road (Trafc in %!m!lative tandard A'les& *)

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Numerical Example

A double lane highway is to be constructepresent trac load of 2500 cvpd at theconstruction with an estimated trac growt7%. The highway is to be designed for a life t

years and the !" value of subgrade is 5%.

#esign the $eible pavement as per "oad Adopt number of standard ales per covehicle ( ).0*.

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Solution:

1, !rac on each lane E E 12"0 cvpd

2, 7umulative repetitions at the end o 20 years$ N

E 12"0 =6" 1.0B

E 2+2 msa

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Alternative - I

=, -or %#R , .and N , 2+2 msa$

a, Thickness o !"-"ase %o!rse , 2* mm with m!" ( +0%

b),Thic-ness of #ense acadam "oad!ase (

b2, Thic-ness of "olled Asphalt "oad!ase ( 1

c,Thic-ness of /urfacing 1earing ourse !ase oursmm

c), inimum Thic-ness of 1earing ourse (40

c2, Thic-ness of !ase ourse (60 mm

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2* mm

2+2

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/ mm

2+2

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mm

2+2

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mm

2+2

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mmendation or #it!mino!s !racing in R(Trafc in %!m!lative tandard A'les&

0n 1!r %ase n , 2+2 msa , 2+2 ' *sa msa

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Alternative- II

-or %#R , .and N , 2+2 msa$

a, Thickness o !"-"ase %o!rse , 2* mm withminimum !" ( +0%

b, !hic#ness o (ean 7oncrete Roadbase E 21" mm

c, !hic#ness o Guracing E 1>0 mm

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2 mm

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3 mm

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Alternative - III

-or %#R , .and N , 2+2 msa$

a, Thickness o !"-"ase %o!rse , 2* mm withminimum !" ( +0%

b, !hic#ness o Cet %i or 'ry 4ound %acadam Roadb2>0 mm

c, !hic#ness o Guracing E 1"0 mm

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23 mm

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mm

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