Concrete Slump Test - Tutorial

on today's video we're gonna show you

how to run a concrete slump test

alright Hussein from Holt engineers is

actually performing the test for me on

the job site but here's what we're doing

we're basically gonna pour concrete into

the steel cone this slump test this is

about a $250 set right here they'll

actually be a link to this in the

description below but who's saying if

you would go ahead and perform the test

for us and I'll talk everybody through

it so he's gonna go ahead and fill this

cone now this is 12 inches tall and what

you saw was he put the cone in water

first just to make sure the concrete

wasn't sticking to it he also put a

little bit of water on the bed so the

concrete wouldn't stick to the bed of

this he's got it on a level surface

which is this plywood that he's using on

every job now he's a third-party testing

company that we use so that our clients

know for sure I can hand them a

third-party certification as to what my

slump tests are and he's doing some

other tests for us but this is a test

that you could do on your own house no

matter what you're doing this is a good

test and what we're generally trying to

figure out here is how much water is in

the concrete now first off you want to

check with the engineer as specified for

the mix and he's usually gonna put a

slump value on that and then also the

ticket from the concrete company is

going to say what the slump is so in

this case we've got a five slump mix

coming from the concrete company and

we're gonna be able to test that with

this cone and basically when he gets

this thing all with all the way filled

we're gonna pull the cone away and see

how much that concrete is fallen now you

can see he's doing this in lifts and

he's done in about three or four lifts

and each time he's using a piece of

rebar he's got a fancy rod here but you

could use a piece of rebar to do this

we're making sure all the air is out you

can see some bubbles coming out of the

bottom making sure that concrete's in

there nice and good and then he's gonna

level it off in a second here and pull

this out okay so that's it

looking good he's saying and again you

could do this on your own I know a lot

of builders that keep a a slump cone in

the back of their truck I know a lot of

concrete guys that are doing this

themselves as well you could even do

this if you were a homeowner doing your

own job or pouring their own job now

he's got a couple of fancy holders here

to hold that cone down he's gonna pull

that off and here's where the money

happens right here

he's pulling that off gently and you can

see we've got still that cone shape this

is a good sign I think we're gonna do

well on this test and this cool thing

about this is it actually has a measure

already so this is 12 inches from the

base to there and what do we got who's

saying it looks like it's about 4 and

3/4 so we're right where we need to be

this is perfect concrete yeah this is

perfect a couple tips for you as we

close out this video

you know you might see concrete with a

really low slump maybe a three slump you

might see really soupy concrete if we're

getting down to like 7/8 that's when we

need to think about not adding any water

on the jobsite because that's going to

be too low and ultimately you're not

going to get the mixture that you're

gonna expect from the plant and your

clients are going to end up having

potentially more cracking in their

foundation or other things remember

though there is a great margin of safety

though when these foundations are

designed and poured so even if we had an

inch more to slump or potentially even

an inch and a half more to slump two

inches it's not a huge deal but we want

to make sure that everybody's testing

and knowing and believe me that

accountability of knowing that you've

got your slump cone on the job and

you're testing concrete it's gonna keep

everybody accountable and everybody's

gonna do the right thing thanks for

joining me guys we'll see you next time