compression and brazillian test

8/15/2019 Compression and Brazillian Test

http://slidepdf.com/reader/full/compression-and-brazillian-test 1/7



Objective:

The objective of this lab was to replicate the ASTM C39/39M Sta!ar! TestMetho! for Co"pressive Stre#th of C$li!rical Cocrete Speci"es a! theASTM C%9&/%9&M Sta!ar! Test Metho! for Splitti# Tesile Stre#th of

C$li!rical Cocrete Speci"es' The cocrete c$li!ers were teste! forstre#th a! t$pe of fail(re to characteri)e the cocrete' The cocretec$li!ers were teste! after ol$ * !a$s of c(ri#+ so the "eas(re! stre#th

fro" the tests is ol$ &,-*,. of the co"plete stre#th of a 0-!a$ c(re!speci"e'

Materials:

• &2 cocrete c$li!ers+ c(re! for * !a$s

• Marer• 4a""er

• la!e

• Scale

• Meas(ri# tape

• Co"pressio "achie

• 6(bber plates

• Steel plates



7roce!(re:

A plastic c$li!er was place! o the 8oor a! a bla!e was we!#e!betwee the cocrete a! the plastic a! wore! i with a ha""er (!erthe cocrete separate! fro" the c$li!er as show i i#(re 1' This process

was repeate! for all of the cocrete sa"ples' The c$li!ers were thewei#he! o a scale+ "eas(re! for !ia"eter a! hei#ht+ a! the a lie was!raw o the !ia"eter of the speci"e with the lies coti(i# !ow the

hei#ht of the c$li!er to the botto" as show i i#(re ' Oe speci"e wasthe teste! for co"pressio stre#th b$ bei# loa!e! ito the co"pressio"achie verticall$ betwee r(bber a! steel plates a! sec(re! as show ii#(re 3' The "achie was the t(re! o to i!(ce loa!i#' Oce the

speci"e faile!+ the "achie was t(re! o+ the 8aws were o(tlie! with a"arer as show i i#(re %+ a! the fail(re loa! was recor!e!' This loa!i#process was repeate! for two "ore speci"es'

To replicate the splitti# tesile stre#th test+ oe c$li!er was loa!e!

hori)otall$ ito the co"pressio "achie betwee r(bber a! steel platesas show i i#(re 5+ a! the "achie was the t(re! o' Oce thespeci"e faile! a! split+ the "achie was t(re! o+ the fail(re loa! was

recor!e!+ a! the speci"e was e;tracte! as show i i#(re &' This processwas repeate! for two "ore speci"es'



Figure 4: C$li!er after co"pressiotest bei# "are! for !efor"ities

Figure 3: 7laci# a c$li!er forco"pressio stre#th test

Figure 2: Mare! c$li!ers after wei#hi#

a! "eas(ri#Figure 1: E;tracti# the cocrete

c$li!ers fro" the plastic cotaiers



Aal$sis of 6es(lts:

Specim

en

Number

Tpe o!

Test

"iame

ter

#in$

%eig

t

#in$

're

a

#in2

$

(eig

t

#lbs$

Failur

e

)oa*#lbs$

Stren

gt

#psi$

No

1 Co"pressio

& 1 *'% 0,+&15 05, T$pe & fail(rholes o s(r

Co"pressio

& 1 *'5 0%+3%, 90, T$pe 5 fail(rof s(rface cr

3 Co"pressio

& 1 *'1 0&+*&, 3,*, T$pe 5 fail(rof s(rface cr

% Tesio & 1 *'5 %+39, 15 4oles o the

5 Tesio & 1 *'5 3+,,5 ,, More holes o

s(rface co"Speci"e %

& Tesio & 1 *'1 %+*%5 , So"e holess(rface

• =ith these res(lts+ it is cocl(sive that cocrete is "(ch stro#er i

co"pressio tha i tesio' Te specimen as an a+erage

compressi+e strengt o! 2,-. psi an* an a+erage splitting

tensile strengt o! 21. psi' The splitti# tesile test #ives lar#erres(lts tha !irect tesile tests+ b(t is (se! to !eter"ie the shear

resistace of the cocrete a! the a"o(t of reiforce"et ee!e! forthe "aterial'



Appe!i;:

Compressive Strength= Pmax

A

Splitting Tensile Strength=2 Pmax

πld

6efereces:

ASTM >teratioal' ASTM C39/C39M-1& Sta!ar! Test Metho! forCo"pressive Stre#th of C$li!rical Cocrete Speci"es' =est

Coshohoce+ 7A: ASTM >teratioal+ ,1&' =eb' ,9 Ma$ ,1&'?http://!;'!oi'or#/1,'15,/C,,39@C,,39M-1&?

ASTM >teratioal' ASTM C%9&/C%9&M-11 Sta!ar! Test Metho! for Splitti# Tesile Stre#th of C$li!rical Cocrete Speci"es' =est

Coshohoce+ 7A: ASTM >teratioal+ ,,%' =eb' ,9 Ma$ ,1&'?http://!;'!oi'or#/ 1,'15,/C,%9&@C,%9&M-11?

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