aggregate and bitumen testing

7/25/2019 Aggregate and Bitumen Testing

1/39

Aggregate and Bitumen

TestingCE 303 TransportationEngineering

University of Peradeniya

Department of CivilEngineering

By

Dr G S Gurusinghe

3rd

ovem!er "00#$


2/39

Desired Quality ofAggregates

%ard &strength' enough to(ithstand the load of tra)* androlling e+uipment$

,esistant to a!rasion and(eathering

on slipping &s-id resistan*e'

Angular &fri*tion !et(een parti*les' .ell graded &pa*-ing'

"


3/39

Eects of ProductionProcess on Quality of

Aggregate Sour*e of aggregates De*omposed or inferior ro*- passing through

*rusher$

/verloading the s*reens *ause e*essof undersi1e materials$

%igher redu*tion of the *rushing plant*an result in 2a-y or elongated parti*les

la-y and elongated aggregates *an*ontain more 4nes &undersi1e' than the*u!i*al aggregates$

3


4/39

Aggregate Tests

There are four main types

Descriptive tests

5isual eamination Non destructive tests

Gradation and shape

Durability tests A!rasion and toughness

Specic gravity tests

6


5/39

Des*riptive tests &descriptive evaluationof mineral aggregates by particle shape)

7

Classification

Description Examples

RoundedFully water-worn orcompletely shaped by

attrition

River or seashoregravel; desert, seashore

and wind blown sand.

IrregularNaturally irregular, or partlyshaped by attrition andhaving rounded edges

ther gravel; land ordug flint

Fla!y "aterial of which thethic!ness id small relative tothe other two dimensions

#aminated roc!, parent$ointed roc!


6/39

8

Classification

Description Examples

%ngular

&ossessing well-definededges formed at theintersection of roughly

planar faces

'rushed roc!s of alltypes; talus( crushedslag

longated

"aterial, usually angular, in

which the length isconsiderably larger than theother two dimensions

#aminated roc!, parent$ointed roc! with asystem of $oints

Fla!y andelongated

"aterial having the length

considerably larger than thewidth, and the widthconsiderably larger than thethic!ness

#aminated roc!, parent$ointed roc! with asystem of $oints


7/399

*escriptive tests +*escriptive evaluation of mineralaggregates by surface teture)

Group

Surfacetexture

Characteristics Examples

lassy 'onchoidal fracture/lac! flint,vitreous slag

0 1mooth

2ater-worn or smoothdue to fracture oflaminated or fine-grained roc!.

ravels, chert,slate, marble,some rhyolites

3 ranular Fracture showing moreor less uniformrounded grains

1andstone, oolite


8/39

#

GroupSurfacetexture

Characteristics Examples

4 Rough

Rough fracture of

fine-or medium-grained roc!containing no easilyvisible crystalline

constituents

"udstone,Noncrystallinelimestone

5 'rystalline'ontaining easilyvisible crystallineconstituents

ranite,gabbro, gneiss

67oneycombed and

porous

2ith visible poresand cavities

/ric!, pumice,foamed slag,clin!er,

epanded clay


9/39

Non Destructive Tests

Gradation tests:Sieve analysis

Shape tests:la-iness inde

:Elongation inde

:Angularity num!er&Tested parti*les grater than

8$37mm in si1e$ '

;


10/39


11/39


12/39


13/39


14/39

B4=B09B03B0 : 004 gm

Fla!iness inde

: 004C9998== : 05

For fla!iness inde consider weight retained in sieve si@e

5= mm and below

Ahe total weight retained

:04B06>B?5B54B=9B9?B>5 : =0 gm

2eight passing through template

:4=B5B34B0?B0B6B5

:


15/39


16/39


17/39


18/39


19/39

e*t to di?erent loads$

The load (hi*h gives


20/39

"0

Aoughness tests %Aggregate ipacttest

Ahe test is carried out by sub$ectingaggregate which has passed the 4 mm and

retained on the = mm sieve to 5 blows of

a 3.6 < 4. !g hammer falling through aheight of 39mm. %fter impact the material

passing the 0.36mm sieve is epressed as a

of the total weight of the original sampleand is termed the aggregate impact value


21/39

"5 =.5

--= -

-= =.-0= =.0

3= =.3 > =.0

-5 =.5

30

=.5

5 =.5

%ll dimensions are in mm

*uctility testsample mould


30/39

30

Softening Point Test

1tirrer

Aripod

1helf to retain

ball after falling

?.5 mm /all/ea!er

Ring

Ahermometer

7older 7older

Ring

uider

/all

'ross section


31/39

3

aggregate and bitumen testing

Documents