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TEST ON COARSE AGGGREGATE

• SPECIFIC GRAVITY

2g of aggregate is washed thoroughly ad !la"ed i the wire #as$et ad i%%ersed i

wire #as$et ad i%%ersed i distilled water at a te%!erature #etwee 22ad &2 ad a

"o'er of at least ("% of water a#o'e the to! of the #as$et) I%%ediately after i%%ersio the etra!!ed air is re%o'ed fro% the sa%!le #y liftig

the #as$et "otaiig its 2(%% a#o'e the #ase of the ta$ ad allowig it to dro! at a

rate of a#o'e oe do!e !er se"od) The #as$et ad aggregate should re%ai

"o%!letely i%%ersed i water for a !eriod of 2*hours afterwards)

The #as$et ad the sa%!le are the weighted while sus!eded i water ad allowed

to drai for a few %iutes+ after whi"h the aggregates are trasferred to oe of dry

a#sor#et "lothes) The e%!ty #as$et is the retured to the ta$ of water ,olted 2(

ti%es ad weighted i water+ w2g)

The aggregate is surfa"e dried till o further %oisture "ould #e re%o'ed #y this "loth)

The the aggregates- are trasferred to the se"od dry "loth s!read i sigle layer ad

allowed to dry for at least ./ %iutes util the aggregate are "o%!letely surfa"e dried)

The surfa"e dried aggregate is the weighed+ 0&g)) The aggregate is !la"ed i a shallow tray ad $e!t i a o'e %aitaied at a

te%!erature of ../o" for 2* hrs) It is the re%o'ed fro% the o'e+ "ooled i a air

tight "otaier ad weighed+ 0*

• AGGREGATE CR1SING VA31E TEST

The %aterial for the stsdard test "osistig of aggregate si4ed ./%%to.2)(%%)

Sie'e the o'e dried %aterial through .2)(%% ad ./%% IS sie'es) The aggregates

 !assig through .2)(%% sie'e ad retaied o ./%% sie'e "o%!rise the test

%aterial) Ta$e a#out &)2($g of this %aterial

Pour the aggregate to fill a#out ,ust %ore tha.5&rd the %easurig "ylider)

Co%!a"t the %aterial #y gi'ig 2( getle #lows with the rouded ed of ta%!ig rod)

Add two %ore layers i si%ilar %aer+ su"h that the "ylider is full)

E%!ty the "ylider ad ta$e the weight)

Trasfer it to the test %ould #y fillig it i three layers i the sa%e %aer as for

"ylider %easure) The total de!th of the sa%!le is the a#out ./"% ad the surfa"e a

little #elow the to! of the %ould)

3e'el of the surfa"e ad !la"e the !luger o'er it )

Pla"e the asse%#ly o the !edestal of the "o%!ressio testig %a"hie)

A!!ly the load at a rate of * to !er %iute util the total a!!lied load is */ toes)

Release the load)

Ta$e the aggregate out of the "ylider ad sie'e the% through 2)&6%% IS sie'e)

0eigh this fra"tio !assig through it to a a""ura"y of /).g%) This fra"tio is a

%easure of loss of %aterial due to "rushig)

 Note dow the o#ser'atios ad "o%!ute the aggregate "rushig 'alue)

• AGGREGATE ANG13ARITY N178ER

Cali#rate the "ylider #y deter %iig the a%out of water re9uired to fill it so that

o %eis"us is !re sie'e aalysis o the aggregeset a#o'e the ri% of the "otaier)

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Test sa%!le: The a%out of aggregate a'aila#le should #e suffi"iet to !ro'ide+ after

se!aratio o the a!!ro!riate !air of sie'es at least ./$g of !redo%iat si4e+ as

deter%ied #y the sie'e aalysis o the aggregate retaied #etwee the a!!ro!riate

 !air of IS sie'es

Sele"t the sa%!le of sigle;si4e retaied #etwee the s!e"ified !air of sie'es) The

dry it i o'e at a te%!erature of .//

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• CO7PACTION FACTOR TEST

Geerally !la"e the sa%!le of "o"rete to #e tested i the u!!er ho!!er+ usig the

had s"oo!)

Fill the ho!!er u! to the #ri% ad o!e the tra! door+ so that "o"rete falls ito lower

ho!!er)

O!e the tra! door of the lower ho!!er ad allow the "o"rete to fall ito the"ylider)

 Cutoff the e>"ess of "o"rete re%aiig a#o'e the le'el of the to! of the "ylider)

This is doe #y holdig a trowel i ea"h had+ with the !lae of the #lades hori4otal+

ad %o'ig the% si%ultaeously oe fro% ea"h side a"ross the to! of the "ylider)

0hile "uttig+ the #lade should #e $e!t !ressed o the to! edge of the "ylider)

0eigh the "o"rete i the "ylider to the earest l/ g%s) This is the weight of

 !artially "o%!a"ted "o"rete)

Refill the "ylider with "o"rete fro% the sa%e sa%!le i layers a!!ro>i%ately ( C%

dee!+ the layers #eig hea'ily ra%%ed or !refera#ly 'i#rated+ so as to o#tai full

"o%!a"tio)

 Stri$e Off ad le'el the to! surfa"e of the fully "o%!a"ted "o"rete)

 Clea Outside of the "ylider ad weigh) This gi'es the weight of fully "o%!a"ted

 "o"rete)

TEST ON CE7ENT

• CONSISTANCY TEST

Ta$e *// g% of "e%et

Ta$e a weighed 9uatity of writer % a #ea$er 

Pre!are a !aste with "e%et ad water)

Fill the Vi"at %ould with the !aste without ay air 'oids ad le'el the to! surfa"e)

The %ould %ay #e slightly sha$e to e>!el air) The gaugig ti%e should ot #e less

tha & %iutes ad should ot #e %ore tha ( %iutes) Gaugig ti%e should #e

"outed fro% the ti%e of addig water to dry "e%et util "o%%e"ig to fill the

%ould)

 Pla"e the %ould uder the Vi"at !luger ad lower the !luger getly to tou"h the

surfa"e of the !aste) The 9ui"$ly release it allowig it to !eetrate ito the !as uder 

its ow weigh)

 Note the !eetratio of the !luger o the s"ale !ro'ided i the Vi"at a!!aratus) If it

is #etwee ( to B%% fro% the #otto%) The water added is "orre"t) Otherwise re!eat

the test with differet water "otets till the re9uired !eetratio is o#taied)

• FINESS OF CE7ENT

8rea$ dow the Iu%!s i the "e%et sa%!le with figers

0eigh a""urately .// g%s of "e%et)

Pla"e it o a stadard IS)/ %i"ro sie'e) Sie'e "otiuously util o %ore fie

%aterial !asses through it)

Re!eat the !ro"ess for two or %ore sa%!les)

• INITIA3 SETTING TI7E

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Pre!aratio of test #lo"$

Pre!are a "e%et !aste #y %i>ig *// g%s of "e%et ad /)D( ti%es the water

Re9uired to gi'e a !aste of stadard "osiste"y

Start a sto!;wat"h+ the %o%et water is added to the "e%et)

 Fill the Vi"at %ould "o%!letely with the "e%et !aste the %ould ad s%oothe thesurfa"e of the !aste %a$ig it le'el with the ta! of the %ould) The "e%et #lo"$ thus

 !re!ared i the %ould is the test #lo"$ 

iitial settig ti%e

Pla"e the test #lo"$ uder the rod #earig the eedle)

3ower the eedle getly i order to %a$e "ota"t with the surfa"e of the "e%et

 !aste ad release 9ui"$ly+ allowig it to !eetrate the test #lo"$)

Re!eat the !ro"edure till the eedle fails to !ier"e the test #lo"$ to a !oit (%%

%easured fro% the #otto% of the %ould)

The ti%e !eriod ela!sig #etwee the ti%e+ water is added to the "e%et ad

the ti%e+ the eedle fails to !ier"e the test #lo"$ #y ()/ is /)(%% %easured fro% the

 #otto% of the %ould+ is the iitial settig ti%e)

TEST ON FINE AGGREGATE

• PARTIC3E SI?E @ETER7INATION

Pre!are the sa%!le for sie'ig fro% the large sa%!le either #y 9uarterig or #y a

sa%!le

8rig the sa%!le to a aid dry "oditio ad weight it dry)

Sie'e the sa%!le su""essi'ely o ) the a!!ro!riate "lea sie'es startig fro% the

largest

0eigh the aggregate retaied o ea"h sie'e

• SPECIFIC GRAVITY @ETER7INATION

Clea ad dry the !y"o%eter) 0eigh the e%!ty #ottle with "a! 02

Fill the !y"o%eter to half of its 'olu%e with distilled water ad %i> it thoroughly

with glass rod) Agai fill the #ottle "o%!letely with distilled water flush with the

hole i the "oi"al "a!) @ry the !y"o%eter fro% outside ad deter%ie the weight

of the #ottle ad the "otets 0&)

 Now e%!ty the #ottle ad thoroughly "lea it) Fill the #ottle with oly distilled water 

ad weigh it) Re!eat the sa%e !ro"ess for 2 to & ti%es+ to ta$e the a'erage readig of it)

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