execution & layout process of asphalt activity.pptx

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Execution & Layout Process O

Asphalt Activity

Prepared by: Bisharat Ali Kan

Reviewed by: Mohammad Min



CONTENTS

Introduction.

Desired Properties ! Asphalt Mi".

#ite $hec%in& and 'ayin& Process.

Prime $oat ( )ac% $oat.

*oints.

)ests.

Machinery +sed ,or Asphalt Pavin&.

Procedure ! Rollin& Pavin& Mi"tures.

)ypes ( ,unctions ! Rollin& Re-uired ,or $ompaction.

$onclusion.



INTRODCTION

Asphalt is thermoplastic material it is called as thermoplastic because it so!tens as it is h

hardens as it is cooled.



DESIRED PROPERTIES O! ASP"ALT #I$

% Sta'ility( Resistance to displacement and shearin& stress caused by stationa

loads.

) Dura'ility( Resistance to disinte&ration due to e!!ects o! tra!!ic water and tempera

* !lexi'ility( Ability o! pavement to adjust to the settlement o! the base without crash

+ ,or-a'ility( Is the ease by which the material can be placed to its desired !orm

to re-uired density.

. I/per/ea'ility( Resistance to the penetration o! water.



SITE C"EC0IN1 & LA2IN1 PROCESS

Asphalt layout at site is chec-e3 thorou4hly 5ith all the para/eters of site chec-in4 At site t

thin4s shoul3 'e chec-e3

a/ )emperature o! the pavin& mi"tures. 01Ran&e o! bituminous mi"ture delivered to the paver at

253$ as per spec./

b/ Appearance o! the pavin& mi"tures. 01Mi" should be !ree !rom e"cessive !ines/ 1'ar&er a&&re&

be uncoated/ 1#hould not be too brown or &rey should not be burnt/

c/ Ali&nment and thic%ness o! the pavement.

d/ Rollin& at correct time and temperature.

e/ #u!!icient rollin&.

!/ #ur!ace irre&ularities and its repair.

&/ 6uantity paved durin& the day.

h/ #tation7 'ocations paved in each shi!t.

i/ $oordination with the mi"in& plant to maintain the rate o! mi"in& and rate o! pavin&.

j/ 8eather condition o! the day.



SITE C"EC0IN1 & LA2IN1 PROCESS66

0 Sa/plin4(

2. Durin& Production samples should be ta%en !rom plant in a !our small sample units to !orm a com!or &radin& Marshall and e"traction.

9. Durin& Pavin& samples should be ta%en behind the paver sample units ta%en !rom di!!erent loca

o! minimum !our sub samples to ma%e one composite asphalt sample !or &radin& Marshall and e"tr



SITE C"EC0IN1 & LA2IN1 PROCESS66



PRI#E COAT & TAC0 COAT

Pri/e Coat( is a li-uid bituminous material havin& %erosene as a solvent with 5; bitumen and <

purpose is to stabili=e and waterproo! the absorbent sur!ace and to promote adhesion to the bitu

!ollow. Apply uni!ormly over sur!ace o! compacted a&&re&ate base to a line 9 mm outside ed&e

at a spray Rate o! .>4 to 2.4 lit 7 s-m. Apply enou&h material to penetrate and seal but not !lo

prime coat to cure !or <? hours. 1As per spec./ Prime coat temperature should be within ran&e o

reject material i! heated above 2? de&. $. Protect primed sur!ace !rom dama&e until ready to rece

Tac- Coat: is a li-uid bituminous material havin& &asoline as a solvent. Its purpose is to provide b

imposed course. Apply uni!ormly to e"istin& sur!ace o! asphalt or Portland cement concrete sur!ac

o! .3 to .5 lit7s-m. )ac% coat temperature should be within ran&e o! 4 to > de&. $ reject

above 2? de&. $.



E$A#PLES O! PRI#E & TAC0 COAT



7OINTS

Ma%e joints so as to ensure throu&h and continuous bond. $ut the previously laid material vertical

so as to e"pose a !resh sur!ace. )he previous layer shall be cut at lon&itudinal o!!set o! at least 3

continuous bond between previous and !resh asphalt. Be!ore placin& the !resh asphalt a&ainst old

the contact sur!ace with a thin uni!orm coat o! li-uid asphalt. Ma%e the lon&itudinal joint by overlap

on the previously laid material !or a minimum width o! 94mm so that the joint !ormed will be smoot



TESTS

#arshal Sta'ility Test

It is the method that covers the measurement o! the resistance to plastic !low o! cylindrical specime

pavin& mi"tures loaded on the lateral sur!ace by means o! Marshal Apparatus. )he method outline

a. Bul% speci!ic &ravity determination

b. #tability and !low test

c. Density and voids analysis

d. 'oss o! stability



TESTS6

Li8ui3 Asphalt Test

a Penetration( Measures the distance that a standard needle will penetrate a sample at a spec

and at a &iven time.

' 9iscosity( @umber o! seconds re-uired !or 5cc o! li-uid asphalt to !low throu&h an ori!ice o! s

speci!ic temperature.

c !lashpoint( Indicates the temperature at which the asphalt can be heated without the dan&e

!las% in the presence o! an open !lame.

3 Softenin4 point( Indicates the temperature at which the harden asphalt reach an arbitrary de&

e Ductility( Ability o! asphalt to stretch be!ore brea%in&. Distance 1cm/ that a standard bri-uette

will stretch be!ore brea%in&.

f Solu'ility( Determine the bitumen content o! the asphalt i.e ;

4 Specific 4ravity( It is mass per unit volume o! substance.



#AC"INER2 SED !OR ASP"ALT PA9IN1

Paver( +sed to pave asphalt mi" Paver is a piece o! construction e-uipment used to lay asphalt o

par%in& lots and other such places. It lays the asphalt !lat and provides minor compaction be!ore it

a roller.




Steel Roller : +sed to settle asphalt mi" and &ive smooth sur!ace. In addition to their own wei&ht

rollers can be ballasted with either sand or water to increase their wei&ht.




Pneu/atic Roller : +sed to &ain re-uired compaction. )he pneumatic tire roller is a sel!prop

device that uses pneumatic tires to compact the underlyin& sur!ace. Pneumatic tire rollers emplo

1no tread/ tires on each a"leC typically !our on one a"le and !ive on the other. )he tires on the !ron

with the &aps between tires on the rear a"el to &ive complete and uni!orm compaction covera&e

the roller.

Advanta&es o! a pneumatic compactor is they provide a more uni!orm de&ree o! compaction

rollers. )hey provide a ti&hter denser sur!ace thus decreasin& permeability o! the layer. )hey p

density that many times cannot be obtained with steel wheeled rollers



PROCEDRE O! ROLLIN1 PA9IN1 #I$TRES

a. Rollin& should be&in as soon as the mi"ture will bear the roller without undue displacement.

b. Rollin& shall be lon&itudinally be&innin& at a low side o! the spread o! material and proceedin&

side. Because the asphalt mi"ture when hot tend to mi&rate towards the low side o! the spread

the roller.

c. #low and uni!orm speed 3 mph !or steel roller and 4 mph !or pneumatic rollers.

d. Roller wheels should %ept moist with only enou&h water to avoid pic%in& up the material.

e. Pneumatic Roller wheels should %ept oily with enou&h coo%in& oil to avoid pic%in& up the mate



T2PES & !NCTION O! ROLLIN1 RE:IRED !OR CO#PACTION

Function Types Weight (Tons) Number

Breakdown #teel 229

Intermediate Pneumatic 2

Finishing #teel 4?

execution & layout process of asphalt activity.pptx

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