2.4 Road Note 29 (RN-29).pptx
-
Upload
rajesh-khadka -
Category
Documents
-
view
260 -
download
1
Transcript of 2.4 Road Note 29 (RN-29).pptx
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
1/33
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
had#a$ acem
21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
2/33
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
had#a$ acem
21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
3/33
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,.
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
4/33
Trafc Analysis
7onversion actors to be used to obtain the euivao standard ales rom the number o commercial ve
.
Table 1
-leible &avement 'esign %ethods/ &repared by Raeshhad#a acem
21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
5/33
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
-leible &avement 'esign %ethods/ &repared by Raesh had#a$ acem21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
6/33
!"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.
-leible &avement 'esign %ethods/ &repared by Raesh had#a$ acem21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
7/33
!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
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
8/33
Fig. 1:21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
9/33
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.
-leible &avement 'esign %ethods/ &repared by Raesh had#a$ acem21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
10/33
#ase $aterials as Recommended "yRoad Note 29
-leible &avement 'esign %ethods/ &repared by Raesh had#a$ acem21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
11/33
#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.
-leible &avement 'esign %ethods/ &repared by Raesh had#a$ acem21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
12/33
Fig. 2:21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
13/33
Fig. 3:
-leible &avement 'esign %ethods/ &repared by Raesh had#a$ acem21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
14/33
Fig. 4:-leible &avement 'esign %ethods/ &repared by Raesh had#a$
acem21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
15/33
!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$
acem21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
16/33
Fig. 2:-leible &avement 'esign %ethods/ &repared by Raesh had#a$
acem
21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
17/33
-leible &avement 'esign %ethods/ &repared by Raesh had#a$acem
21116
Fig.2:
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
18/33
Fig.
4:
-leible &avement 'esign %ethods/ &repared by Raesh had#a$acem
21116
Recommendation or #it!mino!s !racing in Road
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
19/33
Recommendation or #it!mino!s !racing in Road (Trafc in %!m!lative tandard A'les& *)
-leible &avement 'esign %ethods/ &repared by Raeshhad#a$ acem21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
20/33
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 $eible pavement as per "oad Adopt number of standard ales per covehicle ( ).0*.
-leible &avement 'esign %ethods/ &repared by Raeshhad#a$ acem21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
21/33
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
-leible &avement 'esign %ethods/ &repared by Raesh had#a$ acem21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
22/33
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
-leible &avement 'esign %ethods/ &repared by Raesh had#a$ acem21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
23/33
2* mm
2+2
21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
24/33
/ mm
2+2
21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
25/33
mm
2+2
21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
26/33
mm
2+2
21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
27/33
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
-leible &avement 'esign %ethods/ &repared by Raesh had#a$ acem21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
28/33
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
-leible &avement 'esign %ethods/ &repared by Raesh had#a$acem21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
29/33
2 mm
21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
30/33
3 mm
21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
31/33
Alternative - III
-or %#R , .and N , 2+2 msa$
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
-leible &avement 'esign %ethods/ &repared by Raesh had#a$
acem21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
32/33
23 mm
-leible &avement 'esign %ethods/ &repared by Raeshhad#a$ acem
21116
-
7/25/2019 2.4 Road Note 29 (RN-29).pptx
33/33
mm
-leible &avement 'esign %ethods/ &repared by Raesh had#a$acem
21116