As a retired mixer truck driver I had my share of slump test preformed on my loads in my life time, and proud to say I never was caught with a soft load. Now that the test is over its up to the contractor to ask for and sign my tag for any water to be added, at that point concrete strength is his problem.
These videos helped me pass my Performance Exam for ACI Concrete Field Testing Tech Grade 1. Still waiting on my written test results and I feel great about it. (3/18/21)
I was never on a job that a slump test was not required. And usually that means they also take cylinder samples for PSI test. And if their going to do the last two test, you can bet many soil compaction test were also taken on the fill before we got as far as this video.
we use self consolidating concrete at my job. to bad aci tests aren't determined by what you do at your job that way I wouldn't have to do the roller meter.
of course when i did the field tests i waited until like 11am b/c i was nervous and the guy I did the tests for had tee time in a couple of hours so he just had me talk him through the roller meter without actually doing it.
Slump is usually a measure of workability of concrete. Workability is the ability to work with concrete such as pouring the concrete. The higher the amount of the water the more workable your concrete but the weaker its strength. So you want to add just the right amount of water to your cement to make sure you can work with it yet it’s strong enough. Usually, that is a 2 to 1 ratio which gives you around 4000 psi or 25 to 30 MPa strength. These are of course all very rough numbers and needs to be tested for concrete.
@@layneleavitt2537 high slump does not always mean weak concrete. Can’t tell u how many mix approved mix designs there are that require an 8” slump or higher….because of all the admixtures in the concrete
once you remove the mold by raising it gradually, and you measure the distance between the TOP in the MOLD, what is the perfect distance that you should measure? 30cm? 40 cm? please let me, thanks!
Damn not in upstate NY. Seems like just about everyone requests slump, air content and cylinders in some capacity. Some maniacs make me test every single truck 20 trucks in a row. I’m sure slump has a use for determining consistency but my main gripe is how unreliable the test is itself. Two people might do the same concrete, do all the steps technically correct and end up with completely different values. Not to mention trucks will fail slump all the time and people just ignore it, don’t give a shit about anything as long as the cylinders pass
@@Frakkture311 have you done the ACI code certificate? if so kindly do you have recommendation videos will help passing the test as you the course time so short.
Aula Jomaa I did practice tests on line . And watched as many cvideos on density test and slump as I could and air. Just keep watching and keep memorizing the steps.
The very bad method of work. Safety first: gloves! Why you dont have the gloves? Where is the plate of base? The cone is dust. This not a good method. Sorry
As a retired mixer truck driver I had my share of slump test preformed on my loads in my life time, and proud to say I never was caught with a soft load. Now that the test is over its up to the contractor to ask for and sign my tag for any water to be added, at that point concrete strength is his problem.
I like being tested, lets me know I am where I thought I was.
These videos helped me pass my Performance Exam for ACI Concrete Field Testing Tech Grade 1. Still waiting on my written test results and I feel great about it. (3/18/21)
Right on Wyatt!!! Well keep us posted, good on you my friend.
Update?
How did it go?
Wait yall take tests to do this???
Update? Been a year
Very helpful when i first started in the testing business a year on and I’m still loving it as a job !
Thanks to these videos I passed my test
Excellent video, quality, summary, and presenter.
This is good info for me as I learn about construction and building codes.
I’m about to start as a construction materials field testing tech.
Thanks for making this video. 👍
I was never on a job that a slump test was not required. And usually that means they also take cylinder samples for PSI test. And if their going to do the last two test, you can bet many soil compaction test were also taken on the fill before we got as far as this video.
Good info, nice and quick, very clear. Thank you.
could you please explain how does this test effect us an what are the reasons behind it
Hey wouldn't concrete sink your ship?
great video guys!!!! correct correct correct
we use self consolidating concrete at my job. to bad aci tests aren't determined by what you do at your job that way I wouldn't have to do the roller meter.
of course when i did the field tests i waited until like 11am b/c i was nervous and the guy I did the tests for had tee time in a couple of hours so he just had me talk him through the roller meter without actually doing it.
Nice grout
In Russia, a similar method for determining the grade of concrete mobility using a truncated cone.
In Russia, concrete test you
Inteeesting ....Tell me more please.
Sounds like a spread test. We use that in certain applications too.
could someone please explain how does this test effect us an what are the reasons behind it
As a mixer driver most jobs have a spec that we have to meet. Slump is one of them. Too wet (higher slump) means a weaker product.
Slump is usually a measure of workability of concrete. Workability is the ability to work with concrete such as pouring the concrete. The higher the amount of the water the more workable your concrete but the weaker its strength. So you want to add just the right amount of water to your cement to make sure you can work with it yet it’s strong enough. Usually, that is a 2 to 1 ratio which gives you around 4000 psi or 25 to 30 MPa strength. These are of course all very rough numbers and needs to be tested for concrete.
only thing this test does is compare one truck to another load with the same mix, it doesnt tell you water cement ratio, just unformity
@@layneleavitt2537 high slump does not always mean weak concrete. Can’t tell u how many mix approved mix designs there are that require an 8” slump or higher….because of all the admixtures in the concrete
@@empireaxe8852 You can get a higher slump by using different products, its the water/cement ratio that weakens it.
Sir, your mixture are collapsed... 😅 or its just education purpose
I think this slump test for this batch of concrete fails and not up to standard. the drop of concrete to pass a slump test shall be -/+ 25mm?
Great video thank´s
Thanks for sharing.
Tomorrow is my first test alone iam nervous
once you remove the mold by raising it gradually, and you measure the distance between the TOP in the MOLD, what is the perfect distance that you should measure? 30cm? 40 cm?
please let me, thanks!
Cm? You mean inches? 1 ft = 12 in. Measure to the nearest 1/4 in.
depends on what the concrete is being used for
I myself have been filled in 3 layers and rodded 25 times each time
Very informative
use superplasticizer
slump 170-200mm
the slump look like collapse slump ?
A flow table test would be more appropriate if the slump is very high.
why the slump cone is conical ?
Hi,
kindly tell me what is the procedure of slump test for lightweight concrete.
It's the same
ua-cam.com/video/q5GKLFDIB6w/v-deo.html Concrete Slump test | Civil Engineering | Compression Test Concrete Cylinder (Part I)
Very good 👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻
Is it just me or is that concrete really slumpy?
I’m glad I’m not the only one who uses that word with regards to a high slump
It is really slumpy.
Pretty common to see 8"and more depending on admixtures
Is it concrete? Seems like a mortar.
Probably using fly ash
مرفوضه يا معلم
haloo.. nice video
Only jobs these tests are "looked at" are federal jobs.
Anyone interested in an actual slump test is just giving themselves away as not knowing anything about concrete.
It is an outdated test. Slump in the field tells nothing about final strength
Damn not in upstate NY. Seems like just about everyone requests slump, air content and cylinders in some capacity. Some maniacs make me test every single truck 20 trucks in a row. I’m sure slump has a use for determining consistency but my main gripe is how unreliable the test is itself. Two people might do the same concrete, do all the steps technically correct and end up with completely different values. Not to mention trucks will fail slump all the time and people just ignore it, don’t give a shit about anything as long as the cylinders pass
Sir
nice pos
from Afg
💯
Damn that concrete is wet
where are the gloves?! who wants cement burns??
Cement burns are for pussys who haven't been around cement long enough
@@Frakkture311 have you done the ACI code certificate? if so kindly do you have recommendation videos will help passing the test as you the course time so short.
Aula Jomaa I did practice tests on line . And watched as many cvideos on density test and slump as I could and air. Just keep watching and keep memorizing the steps.
Aula Jomaa are you from Canada or states ?
@Miles Latham lol I don't know if I ever wrote 16 hours. I booked time for the course and then we had this Coronavirus thing.
LUBE THE CONE.
Again google is spying on me. No searches and this shows up unexpectedly and relevant to my new field
7 1/2" slump! Just perfect for driveway pouring Yahoo's
That could be the spec for pump mixes or for places where you don't want voids due to rebar.
100 mm is good.
i cant believe im studying this shit rip
Very bad slump
Level within an 8th
The very bad method of work. Safety first: gloves! Why you dont have the gloves? Where is the plate of base?
The cone is dust. This not a good method. Sorry