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Laboratory Exercise No.11
Slump of Hydraulic Cement Concrete
I. Reference:
AA A A S H T O T 119 11 9 - 9 9 , AS T M C 1 4 3 / C 1 4 3 M – 9
II. Objective:
To determine t!e "lump of fre"!ly mi#ed concrete$
III. Equipment / Apparatus:
Metal pan Slump cone %it! metal &a"e Tampin' rod Slump apparatu" Scoop
I. !roce"ure:
1 $ O & t a i n " a m pl pl e o f c o n c r e t e i n a c c o r d a n c e t o t ! e " t a n d a r d procedure of "amplin' fre"!ly mi#ed concrete$ ( $ ) am a m pe p e n t ! e m ol o l d a nd n d p la l a ce c e i t o n a f la l a t, t , m oi o i "t " t , n o n -a -a &" & " or o r &e & e nt nt *ri'id+ "urface$ t "!all &e !eld firmly in place durin' fillin' &y t!e o pe p e ra r a to t o r " ta t a nd n d in i n ' i n t !e ! e t %o % o f oo o o t p ie i e ce c e "$ " $ ro r o m t !e ! e " am a m pl pl e o f concrete o&tained, immediately fill t!e mold in t!ree layer", eac! appro#imately on t!ird t!e .olume of t!e mold$ 3 $ od od e ac a c ! l ay a y e r % i t! t ! ( 0 " tr tr o o e" e " o f t !e ! e t am am pi p i n' n ' r od o d $ 2 n if i f or o r m ly ly di"tri&ute t!e "troe" o.er t!e cro"" "ection of eac! layer$ or or t!e & o tt tt om o m l a ye ye r t ! i" i " % il i l l n e ce ce " "i "i t at a t e i nc n c l in i n i n' n' t !e ! e r o d " li l i ' !t !t l y a nd nd main' appro#imately !alf of t!e "troe" near t!e perimeter, and t!en pro're""in' %it! .ertical "troe" "pirally to%ard t!e center$ od t!e &ottom layer t!rou'!out it" dept!$ od t!e "econd layer and t!e top layer eac! t!rou'!out it" dept!, "o t!at t!e "troe" u u " t p e n e t r a t e i n t o t ! e u n d e r l y i n ' l a ye r $ 4 $ n f i l li l i n ' a n d r o dd d d in i n ' t ! e t o p l a y er e r , ! ea e a p t ! e c o n cr cr e te te a &o & o .e .e t ! e m o ld l d & e fo fo r e r od o d di d i n ' i " " t ra ra t ed e d $ f t !e ! e r od o d di d i n ' o pe p e r at at i on on r e "u "u l t" t" " u& u & "i " i de d e nc n c e o f t !e ! e c on o n cr c r et e t e & el e l o% o % t !e ! e e d' d ' e o f t !e ! e m ol o l d, d , a dd dd additional additional concrete to eep an e#ce"" of concrete a&o.e t!e top of
t!e mold at all time"$ After t!e top layer !a" &een roded, "tie off t!e "urface of t!e concrete &y mean" of a "creedin' and rollin' motion of t!e tampin' rod$ emo.e t!e mold immediately from t!e concrete &y rai"in' it carefully in a .ertical direction$ ai"e t!e mold a di"tance of 1( in$ *3 mm+ in 05("$ &y a "teady up%ard lift %it! no lateral or tor"ional motion$ 0 $ mm ed iat el y m ea"u re t!e "l um p & y d et erm in in' t!e .e rt ic al difference &et%een t!e top of t!e mold and t!e di"placed ori'inal center of t!e top "urface of t!e "pecimen$ f a decided fallin' a%ay or "!earin' off of concrete from one "ide or portion of t!e ma"" occur", di"re'ard t!e te"t and mae a ne% te"t on anot!er portion of t!e "ample
. I##ustrations:
$i%. 11.1: Mi#in' t!e cement and a''re'ate"$
$i%.11.(: emo.in' cylinder mold$
$i%. 11.&: Tran"ferrin' t!e Concrete in t!e Slump Cone
