how the slump and Compressive Strength of concrete cube is performed in a civi

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how the slump and Compressive Strength of concrete cube is
performed in a civil engg lab ?

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how the slump and Compressive Strength of concrete cube is performed in a civil engg lab ?..

Answer / shunmugam

the slump test is carried in engineering lab by the slump
cone apparatus the given mixed concrete is placed in the
slump cone with a base plate under then the concrete is
filled in 3 layers each layer is compacted with tamping rod
by giving 25 blows on each layer the standard length of
slump cone is 30cm the slump cone is then taken out the
amount or the length at which the concrete slumped with
respect to 30cm is then find out

Compressive strength of concrete cube is made by preparing
a concrete cube is to be made with standard grade say
m15,m20....m40 etc then it is cured for about 28 days and
then it is palced in a compression testing machine the load
at which concrete cube fails is noted which divided by the
cross sectional area gives the compressive strength of
concrete

Is This Answer Correct ?

61 Yes

5 No

how the slump and Compressive Strength of concrete cube is performed in a civil engg lab ?..

Answer / narendra

Apparatus:-Large pan,Trowel to mix concrete mixture,Steel
tamping rod(20 mm dia.),Slump cone,Ruler,Fresh Concrete
(Cement, water, sand, aggregates and admixes).
Steps
Place the mixing pan on the flat and levelelled floor and
moisten it with some water. Make sure it is damp but no
free water is left.
Place the sand in the pan. Add the cement and mix it with
the sand.
Add the coarse/fine aggregate and thoroughly mix.
Mix the water and dry cement ingredients thoroughly using
the trowel.
Firmly hold the slump cone in place using the 2 foot holds
(nut bolt or any other arrangement).
Fill one-third of the cone with the concrete mixture. Then
tamp the layer 25 times using the steel rod in a circular
motion, making sure not to stir.
Add more concrete mixture to the two-thirds mark. Repeat
tamping for 25 times again. Tamp just barely into the
previous layer(1")
Fill up the whole cone up to the top with some excess
concrete coming out of top, then repeat tamping 25 times.
(if there is not enough concrete from tamping compression,
stop tamping, add more, then continue tamping at previous
number)
Remove excess concrete from the opening of the slump cone
by using tamping rod in a rolling motion until flat.
Slowly and carefully remove the cone by lifting it
vertically (5 seconds +/- 2 seconds), making sure that the
concrete sample does not move.
Wait for the concrete mixture as it slowly slumps.
After the concrete stabilizes, measure the slump-height by
turning the slump cone upside down next to the sample,
placing the tamping rod on the slump cone and measuring the
distance from the rod to the ORIGINAL DISPLACED CENTER.

Is This Answer Correct ?

30 Yes

3 No

how the slump and Compressive Strength of concrete cube is performed in a civil engg lab ?..

Answer / mks

slump test :slump cone of size top dia 10cm bottom dia 20cm
ht.30cm, fill cone with concrete to be tested . remove
slump cone gradually vertically, measure fall of heave from
top of slump cone which indicates slump of concrete.

compressive strength:it is perform on 7.07cm cube and test
under universal testing machine after 7,14,28 days.

Is This Answer Correct ?

17 Yes

2 No

how the slump and Compressive Strength of concrete cube is performed in a civil engg lab ?..

Answer / ishtiaq ahmed

if slump will increase then which effect will be on consrete

Is This Answer Correct ?

8 Yes

0 No

how the slump and Compressive Strength of concrete cube is performed in a civil engg lab ?..

Answer / julius dulawen

Set the slump cone and fill with concrete mix at 3 layers
and tamp by using the 16mm Plain round bar 25 times each
layer but be sure not to touch the previous layer. Remove
excess concrete on last layer then carefully remove the
cone vertically and place beside the concrete mix. measure
the slump by a measuring device the compare to the
specified slump height.

Concrete cubes is performed by mixing water, cement and
sand in a portable concrete mixer. place the mix in 3 sets
of 2"x2"x2" steel mold, 3 cubes each set then mark each set
for 3, 7, and 28 days. Place the cubes in a curing pan
after removal from the mold when hardened then test it for
3,7 and 28th day age for compressive strength determination.

Is This Answer Correct ?

5 Yes

1 No

how the slump and Compressive Strength of concrete cube is performed in a civil engg lab ?..

Answer / raju pathak

if the slump is high then setting time should be delay as
normal setting if there is no segresion in concrete but
slump high should not be effect to compressive strength of
concrete

Is This Answer Correct ?

4 Yes

2 No

how the slump and Compressive Strength of concrete cube is performed in a civil engg lab ?..

Answer / patricio baluga jr

Fill up the whole cone up to the top with some excess
concrete coming out of top, then repeat tamping 25 times.
(if there is not enough concrete from tamping compression,
stop tamping, add more, then continue tamping at previous
number)
Remove excess concrete from the opening of the slump cone
by using tamping rod in a rolling motion until flat.
Slowly and carefully remove the cone by lifting it
vertically (5 seconds +/- 2 seconds), making sure that the
concrete sample does not move.
Wait for the concrete mixture as it slowly slumps.
After the concrete stabilizes, measure the slump-height by
turning the slump cone upside down next to the sample,
placing the tamping rod on the slump cone and measuring the
distance from the rod to the ORIGINAL DISPLACED CENTER.