Method Statement –Roadwork 1.0
OBJECTIVE
This Work Work Method Statement Statement is to outline outline the apply and and lay pavement pavement for the road construction consisting of sub-base of granular material, road base of crusher run, asphaltic concrete binder course and asphaltic concrete wearing course.
2.0
SCOPE
This method statement shall apply for all roadwork. roadwork. The intention of this work method statement is to give general guideline for the roadwork construction. Detail Details s of the proce procedur dures es conta containe ined d herein herein may be modie modied d based based upon upon actual ground condition and site re!uirements.
3.0
REFERENCES JKR/SPJ/1988 JKR/SPJ/1988 Specifcatio! Specifcatio! Sectio Sectio " Spesikasi #embinaan $alan I!pectio C$ec%&i!t 'o( Roa)*o(% Co!+&tat,! Co!+&tat,! -(a*i! Specifcatio! Specifcatio!
"
# # ".0
CINER E45IPENT "
#aving aving Set
"
Diamond Diamond %utter %utter
"
&ackhoe "
&ack pusher
"
Tipper Tipper 'orries 'orries
"
Total Total Station "
(ibratory (ibratory roller
"
Thermometer Thermometer
'evelling )nstrument
6.0
.0
TERI7 "
Sand
"
%rusher run
"
*sphaltic %oncrete &inder %ourse *%&% +
"
*sphaltic %oncrete Wearing %ourse *%&% +
"
&ituminous &itumino us #rime %oat
"
&ituminous &itumino us Tack %oat
CONSTR5CTION PROCE-5RE
"
.1
ee(a&
././
&efore pavement construction can be allowed it is necessary for
both the hori0ontal and vertical alignment to be 1oint inspection and conrmed by the %onsultant. ./.+
Surveyor shall be using proper instrument total station and
dumping level to mark on site which is visible and protected during work construction. ./.2
#avement construction works shall only be allowed to commence on
site upon the approval and acceptance of the sub-grade layer. ./.3
The %ontractor shall counter check again the alignment and all
dipping pegs and conrm with the %onsultant prior to the permanent work.
.2
:o(% Se;+ece F&o*
'aying /mm granular material sub-base 'aying +mm crusher run road base 'aying mm *sphaltic %oncrete &inder %ourse 'aying 3mm *sphaltic %oncrete Wearing %ourse .3
P(epa(atio o' Fo(
.2./ The preparation of formation shall be carried out only after completion of piped or bo4 culvert, services, utilities and ducts 5if any6 or any other drainage work that might a7ect the works, unless otherwise agreed by %onsultant and such preparation shall be carried out immediately prior to the laying of the sub-base. .2.+
*ll the materials for sub base, road base, *%&% and *%W% shall be
sent to nominated
and approve laboratory to conduct necessary testing and to be comply with technical specication. .2.2
The surface of the formation shall be substantially uniform in density
throughout its entire width and shall conform to the density re!uirements for compaction. Trial compaction to be conducted in order to determine the designated degree of compaction as re!uired with a present of supervision consultant. .2.3
8ther utilities crossing the road such as water mains and cables shall
be protected before
proceed the road base works. 9or e4ample using lid
for u-drain and :.). conduit for cables. .2.;
)t shall be trimmed to conform to the lines, camber, grades and typical
cross sections shown on the drawings or as directed by %onsultant. .2.
The sample of earth to send to lab for MDD test for comparison of
degrees compaction. .2.< .2.
To conduct trial compaction to determine passes roller re!uired. 'evel pegging to be done at suitable distance for inspection.
."
Ea(t$ Fo(
.3./
Where soft spots and unsuitable materials found, it shall be removed
and backlled with approved suitable material and compacted in accordance to the agreed rolling pattern.
.6 .;./
S+> Ba!e The sub base material shall be hard, durable and clean. )t shall be
granular material and shall be free from organic material, clay balls, and any other deleterious substances. .;.+
The materials will be delivered to the site by tipper lorries and
spread and leveled by means of a back pusher for the full width of the pavement. The material shall be lled and compacted to the re!uired thickness as specied in the drawing.
.;.2
%ompaction of the sub base layer shall be carried out by using
vibrating roller to achieve relative dry density as per specication. .;.3
*lignment, level and surface
regularity
will be
checked in
accordance to Technical Specication. .;.;
The nal surface of granular sub base layer shall be regulated and
trimmed by back pusher to the re!uired level and cross fall within the specied vertical tolerances. %ompaction work will be done using roller compactor. .;.
9ield Density Test 59DT6 or %&= Test on the subgrade shall be
carried out according to the specication.
.
7a?i Roa) Ba!e ate(ia&
../
The crusher run road base to be placed on top of the sub base shall
consisting of crushed aggregate laid in layers each of thickness not e4ceeding +mm and to give the specied total compacted thickness and width, correct line and levels shown in drawings. ..+
The material shall be crushed rock of hard durable particles or
fragments of rock crushed to the correct si0e, well graded and lie within the following grading limits specied in the specication. ..2
%are shall be taken to prevent segregation of the material into the
coarse and ne fractions.
.@ .<./
Bit+
material submission shall be applied to the top of the completed crusher run base course before laying the
asphaltic concrete binder course. .<.+
The surface shall be cleaned immediately prior to the application of
prime coat. The bituminous shall be applied by means of a distributor at suitable rates but not to be less than .32; liters per s! meter. SS/> using for prime coat while =S/> using for tack coat. .<.2
The surface of the dense asphaltic concrete binder course shall be
cleaned immediately prior to the application of an approve tack coat. The bituminous shall be applied by means of a distributor at suitable rates but not to be less than .2; liters per s! meter. .<.3
The prime coat shall be sprayed well in advance and leave for +3
hours for curing.
.8 ../
!p$a&tic Coc(ete S+('aci :eneral
The surfacing shall be two courses and shall comprise of asphaltic concrete binder course and *sphaltic concrete wearing course and lay in accordance with &S /+/. The two courses shall be constructed to the width and thickness after compaction as shown in the drawing. ..+
Material
/6 %ourse *ggregate %ourse aggregate shall be hard un-weathered, durable, clean crushed rock, angular in shape, free from dust and tested in accordance with the methods described in &.S. /+. +6 9ine aggregate 9ine aggregate shall be approved clean natural bank, river, dune, pit or !uarry sand produced in a secondary plant. They shall consist of hard, non-absorbent sharp grains and shall be free from clay, loam, loosely bounded aggregations and other foreign matters. 26
9iller
9iller shall be either #ortland %ement complying with &.S. /+ or limestone, having a bulk density in Toluene.
.9
!p$a&tic Coc(ete Bi)e( Co+(!eA CBC 28
6.9.1
ACBC 28 mix will follow the approved mix design and trial
mix. .?././
The aggregates shall be surface dry and shall be mi4ed at an
appropriate temperature. The mi4ed material as delivered to the laying site shall be between /3 degrees %elsius to / degrees %elsius.
6.9.2
Laying Proed!re
.?.+./
Work shall commence on site upon approval and acceptance of the
road base. .?.+.+
The surface to receive the asphaltic concrete binder course shall be
free of all damage, loose materials and standing water by sweeping. .?.+.2
#rime coat of approved bitumen emulsion shall be applied as per
Specications on the prepared surface prior to lay of the asphaltic binder course. .?.+.3
The asphaltic concrete binder shall be plant mi4ed with approved
bitumen content. .?.+.;
The approved asphaltic concrete binder course shall be delivered
to site by tipper trucks. To prevent the loss of heat, the mi4ture shall covered by tarpaulin. .?.+.
The asphaltic concrete binder course shall be laid by a paver in
single layer. .?.+.<
%ompaction shall be carried out using the specied e!uivalent type
of compactors. =olling shall always commence from the lower to the higher side of the carriageway. The minimum rolling temperature shall be degrees %elsius. .?.+.
The surface of asphaltic concrete binder course shall be nished
to the line and grade as re!uired by the Drawings.
6.1"
Asphalti Conrete #earing Co!rse AC#C2"
././ ./././
*%W% + mi4 will follow the approved design mi4 and trial mi4. The aggregates shall be surface dry and shall be mi4ed at an
appropriate temperature. The mi4ed material as delivered to the laying site shall be between /3 degrees %elsius to / degrees %elsius.
.10.2
7a?i P(oce)+(e!
./.+./
Work shall commence on site upon approval and acceptance of
the asphaltic concrete binder course. ./.+.+
The surface to receive the asphaltic concrete wearing course shall
be free of all damage, loose materials and standing water by sweeping. ./.+.2
Tack coat of approved bitumen emulsion shall be applied as per
Specications on the prepared surface prior to lay of the asphaltic wearing course. ./.+.3
The asphaltic concrete wearing shall be plant mi4ed with bitumen
content. ./.+.;
The approved asphaltic wearing course shall be delivered to site
by tipper trucks. To prevent the loss of heat, the mi4ture shall covered by tarpaulin. ./.+.
The asphaltic concrete wearing course shall be laid by a paver in
single layer. ./.+.<
%ompaction shall be carried out using the specied e!uivalent
type of compactors. =olling shall always commence from the lower to the higher side of the carriageway. The minimum rolling temperature shall be /+; degrees %elsius. ./.+.
The surface of asphaltic concrete wearing course shall be nished
to the line and grade as re!uired by the Drawings. ./.+.?
@pon completion of laying and compaction, 1oint survey shall be
carried out to check for compliance with the specied re!uirement. ./.+./
*fter all the above works is completed, the supervisor is to
ensure that the site is to be tidied up and all e4cess materials are to be discarded away from the site.
.11
T(a!po(ti
.//./
&ituminous materials shall be transported in clean vehicles and shall
be covered over when in transit or awaiting tipping. .//.+
Avery precaution is to be taken to avoid segregation of mi4ed
materials and to ensure that they do not become contaminated with foreign matter. .//.2
)n order to maintain satisfactory temperatures of materials in transit
and to prevent undue loss of heat ade!uate precautions are to be taken to ensure that the materials are properly protected.
.12
7a?i
./+./
The mi4ed materials shall, as soon as possible after arrival at the
laying site, be supplied continuously to the paver and laid without delay ./+.+
Wherever practicable, road pavement materials having bitumen as
the binder shall be spread, leveled and tamped by approved self-propelled pavers capable of laying to the re!uired width, prole, camber or cross fall. ./+.2
)mmediately after any course is placed and before rolling is started,
the surface shall be checked and all defects and irregularities in alignment, grade or te4ture corrected by the additional or removal of mi4ture.
.13
Co
./2./
The compaction shall be compacted as soon as possible as rolling
can be e7ected without causing undue displacement of the mi4ed material. ./2.+
The rollers shall be tted with beeper.
./2.2
The materials shall be rolled in longitudinal direction from the sides
to the centre of the
carriageway. ./2.3
9or compaction, two times rolls pass by non-vibrate compactor prior
to two times rolls pass by vibrate compactor. The roller shall weigh not less than /+ tonnes. ./2.;
Aight times rolls pass compaction shall be carried out by tyre roller.
./2.
The last compaction shall be done by non-vibrate compactor.
@.0
Sa'et? ) E=i(o
@.1
Sa'et?
<././
Safety induction to be conducted to all new workers that involved to
this activity and safety toll bo4 meeting shall be conducted every day to remind the workers about concerning the safety. <./.+
*ll
workers
shall be provided
with
##A
5#ersonal
#rotective
A!uipment6 and shall be worn at all time on site. Safety Manager B Safety Supervisor shallensure all the workers wear all the safety e!uipments provided. <./.2
*ll workers shall be advised to report any accident or in1ury to
supervisor. <./.3
#roper and ade!uate provision of temporary signageCs and
barricades at diversions and temporary haul road as necessary 5if applicable6.
@.2 <.+./
E=i(o
practices and well disciplined to environment. <.+.+
The garbage bin shall be provided at the working area and
Supervisor shall ensure its must be collected regularly and disposed o7 at the approved dumpsite. <.+.2
*ll workers shall ensure that all tools and e!uipment machinery are
in good condition to
avoid any oil leakage that could harm to environment.
