This is awesome, I have had several concrete guys tell me that they use motor oil for form oil and I always thought "Ummm...." so this is reassuring. The motor oil actually seems to have increased average compressive strength by 5% when used as a form liner. Why might that be? Improved consolidation at the edges of the concrete since the concrete could slide around easily? But then why would the other form oils seem to have the opposite effect?
Excellent work Thanks. As a concrete contractor with alot of money invested in rapid wood forms I often have workers use extra oil to allow easy release and prevent damage to wood forms. Used motor oil ruins forms not allowed to be used in NYS/NYC for decades now. Wood peels off forms and causes cancer in workers who handle used motor oils. We use cherry oils. Thanks .
@@TylerLey Do one on ACI 318 "form oil on rebar." And it's effects on bond development length etc. We had some kid inspector reject a job claiming oil not allowed on rebar...lol PS: I have BS in civil engineering NYS 1990. I miss University years. Shalom
Congratulations Form Oil for being the Winner! . THANK YOU Students for performing this test. THANK YOU to Dr. Ley as well. This is something that has interested me for a very long time.
Amazing channel! Thank you for sharing information and demystifying concrete. Concrete is my hobby and I'd love to see future videos about AAC, woodcrete, and cement tiles. Thank you once again!
Alternatives like paraffin, beeswax, lard and coconut oil have properties that could be useful in form coating. Melting points, thermal expansion coefficients, renewability, etc... If the form surface was dimpled and filled flat with wax or a solidified oil like (rendered?) lard or coconut oil, it could last almost indefinitely. Reminded me that wax coated fast food cups work amazingly well for experimental purposes when doing a bunch of tests.
Very informative, great work guys! Never realised that you could mix release agent with the concrete... how does the concrete know the difference between the formwork and the rebar? What is resistivity (4:46)? Many thanks... Clark
Clark, Thanks so much! You can learn more about resistivity here: th-cam.com/video/6_s9iLjZuN8/w-d-xo.html Most people don't mix in form oil. The students did it to be extreme and see how much it would impact the results of the concrete.
Very interesting video. I seem to recall that someone came out with a wax form release agent many years ago. Any info on that? Wishing you all a Happy and Healthy New Year. Good Luck, Rick
@@TylerLey I think that the wax cured to a dry coating and also protected the forms. There may have been a problem if there was too much time between pouring and stripping. Good Luck, Rick
I know waxes are used for decorative concrete molding, (usually with some solvent that evaporates so the wax can be sprayed/brushed on easily) so other than cost I don't know why they wouldn't work for structural uses.
Hi, I am from India & doing my job at Industrial construction from last 6 years as a civil engineer. Can you make a video about form oil to show difference between water based shuttering oil & diesel .
Thank you guys. Another informative vid. A suggestion would be to compare industry standard form oils and note differences in performance, however supple they are. 👍👍🇦🇺
is the term "eating away" the proper terminology for the condition experienced for the surface between the concrete, the motor oil, and the cylinder? Eating away would imply that the surface of the concrete was formed, but an external factor had a later effect on the surface of the cured concrete. What I am witnessing is a certain amount of surface tension of the oil which is being pushed aside by small variances in the external pressure exerted by the mix itself, since the mix is high in water. This creates trapped oil/water (which doesnt vibrate out all that easily, being that oil wants to stay clinged to the molecular properties of plastics, including polycarbonate and the mold material). In other words, it didnt "eat" at the surface, much like air pockets that are found after the removal of forms aren't referred to as "air ate the surface of the concrete". The air prevented the contact of the concrete with the form, much like the oil i/water interaction is preventing contact with a smooth cylinder side.
Hay Tyler: what would be the effect of spraying light coat of high tack oil on rebar caging and would it keep rebar safer in saltwater or chlorinated area. What if a zinc anode was placed periodically at the outer perimeter of the rebar cage? Would these methods reduce corrosion ? Or should we just spring for stainless?
I think that the first thing to consider is if you need form oil. But even then I see more possible alternatives than the selected ones, so what about wax and grease on the form? Also it may depend on the material of the form.
We never use oil and our cylinders only break occasionally... In fact we reuse the cylinder's for 2 pours... Maybe your cylinders are weak or maybe it's because we don't drill the hole in the center of the mold but offset
A most Needed video.. Thank You All.. Still I want to see a video on making Post WWII Bomb Shelter grade Concrete [ Nuclear Concrete] . The type used in Municipal Buildings , and Hospital Shelters.
I did hit like for the video even though this isnt even a problem. It was proven years ago. But yes some people, actually all of us, like to see results especially cause and effect.
I think they used approximately 9g for each cylinder. Maybe this is a standard for test cylinders? I agree, it did look excessive though. I wonder if this amount would be acceptable on the field where you are applying oil to wood forms, seeing how wood actually absorbs the oil.
Idiotic test. Nobody pours against plexiglass. Build some forms out of BB Plyform, 2x, steel and MDO and then test. Surface tension/capillary/absorbtion will be vastly different.
This is awesome, I have had several concrete guys tell me that they use motor oil for form oil and I always thought "Ummm...." so this is reassuring. The motor oil actually seems to have increased average compressive strength by 5% when used as a form liner. Why might that be? Improved consolidation at the edges of the concrete since the concrete could slide around easily? But then why would the other form oils seem to have the opposite effect?
Interesting. Well done students. Must be a joy to have these young people to teach.
Excellent work Thanks.
As a concrete contractor with alot of money invested in rapid wood forms I often have workers use extra oil to allow easy release and prevent damage to wood forms.
Used motor oil ruins forms not allowed to be used in NYS/NYC for decades now. Wood peels off forms and causes cancer in workers who handle used motor oils.
We use cherry oils.
Thanks .
Thanks for the feedback!!! We agree that used motor oil is not the best thing to use.
@@TylerLey Do one on ACI 318 "form oil on rebar." And it's effects on bond development length etc.
We had some kid inspector reject a job claiming oil not allowed on rebar...lol
PS:
I have BS in civil engineering NYS 1990.
I miss University years.
Shalom
Congratulations Form Oil for being the Winner! . THANK YOU Students for performing this test. THANK YOU to Dr. Ley as well. This is something that has interested me for a very long time.
Amazing channel! Thank you for sharing information and demystifying concrete. Concrete is my hobby and I'd love to see future videos about AAC, woodcrete, and cement tiles. Thank you once again!
Alternatives like paraffin, beeswax, lard and coconut oil have properties that could be useful in form coating. Melting points, thermal expansion coefficients, renewability, etc... If the form surface was dimpled and filled flat with wax or a solidified oil like (rendered?) lard or coconut oil, it could last almost indefinitely.
Reminded me that wax coated fast food cups work amazingly well for experimental purposes when doing a bunch of tests.
Very informative, great work guys!
Never realised that you could mix release agent with the concrete... how does the concrete know the difference between the formwork and the rebar?
What is resistivity (4:46)?
Many thanks... Clark
Clark,
Thanks so much!
You can learn more about resistivity here:
th-cam.com/video/6_s9iLjZuN8/w-d-xo.html
Most people don't mix in form oil. The students did it to be extreme and see how much it would impact the results of the concrete.
Really interesting and now, I am stuck with an idea from this video 😅 Thanks for another awesome video.
Very interesting video. I seem to recall that someone came out with a wax form release agent many years ago. Any info on that? Wishing you all a Happy and Healthy New Year. Good Luck, Rick
Thanks Rick
I have not heard about a wax form oil but I don't doubt it!
@@TylerLey I think that the wax cured to a dry coating and also protected the forms. There may have been a problem if there was too much time between pouring and stripping. Good Luck, Rick
I know waxes are used for decorative concrete molding, (usually with some solvent that evaporates so the wax can be sprayed/brushed on easily) so other than cost I don't know why they wouldn't work for structural uses.
Hi,
I am from India & doing my job at Industrial construction from last 6 years as a civil engineer. Can you make a video about form oil to show difference between water based shuttering oil & diesel .
Thank you guys. Another informative vid. A suggestion would be to compare industry standard form oils and note differences in performance, however supple they are. 👍👍🇦🇺
Thanks Andrew!
The students wanted to try some drastically different materials in the tests. I think this is a good idea for future work.
Do you think that 30-40 seconds of vibration caused over consolidation of the concrete?
wonderful work. Thanks
Should try veggie oil or some other type of cooking oil?
Good job! Thanks for you time and this information. Otsukarasamadeshita
is the term "eating away" the proper terminology for the condition experienced for the surface between the concrete, the motor oil, and the cylinder? Eating away would imply that the surface of the concrete was formed, but an external factor had a later effect on the surface of the cured concrete. What I am witnessing is a certain amount of surface tension of the oil which is being pushed aside by small variances in the external pressure exerted by the mix itself, since the mix is high in water. This creates trapped oil/water (which doesnt vibrate out all that easily, being that oil wants to stay clinged to the molecular properties of plastics, including polycarbonate and the mold material). In other words, it didnt "eat" at the surface, much like air pockets that are found after the removal of forms aren't referred to as "air ate the surface of the concrete". The air prevented the contact of the concrete with the form, much like the oil i/water interaction is preventing contact with a smooth cylinder side.
Hay Tyler: what would be the effect of spraying light coat of high tack oil on rebar caging and would it keep rebar safer in saltwater or chlorinated area. What if a zinc anode was placed periodically at the outer perimeter of the rebar cage? Would these methods reduce corrosion ? Or should we just spring for stainless?
I think that the first thing to consider is if you need form oil.
But even then I see more possible alternatives than the selected ones, so what about wax and grease on the form?
Also it may depend on the material of the form.
All true!
This is a limited sample set but for the materials and tests investigated commercial form oil seems helpful!
We never use oil and our cylinders only break occasionally... In fact we reuse the cylinder's for 2 pours... Maybe your cylinders are weak or maybe it's because we don't drill the hole in the center of the mold but offset
Who knows! We can reuse cylinders for 5+ times if we use form oil.
@@TylerLey I'll let the team know.. thanks
A most Needed video.. Thank You All.. Still I want to see a video on making Post WWII Bomb Shelter grade Concrete [ Nuclear Concrete] . The type used in Municipal Buildings , and Hospital Shelters.
Add motor oil at ratio of 2% cement for mortar mix .. check it's crack pattern.. mortar with motor oil produce lesser no crack ..
I did hit like for the video even though this isnt even a problem. It was proven years ago. But yes some people, actually all of us, like to see results especially cause and effect.
Thank you class! 😁 Have you graduated yet?
Most common one used in the NE is diesel.
They are bachelor or master ?
bachelor
First up don't leave excess
That was drilled into my head working on bridges.
I think they used approximately 9g for each cylinder. Maybe this is a standard for test cylinders? I agree, it did look excessive though. I wonder if this amount would be acceptable on the field where you are applying oil to wood forms, seeing how wood actually absorbs the oil.
This mean i should add oil for concrete i dont understand the benefits of adding oil
This means you should use form oil on the forms and not add it to the concrete. They added it to the concrete to see and extreme case.
You dont mix oil into the concrete.
Lauren is a cutie. Oh, and great sciencing, all.
Dang music is killing me.
Why are you testing the use of the wrong mold release agent? Wax, my peeps, wax!
:D
Thanks Wroger!!!
Idiotic test. Nobody pours against plexiglass. Build some forms out of BB Plyform, 2x, steel and MDO and then test. Surface tension/capillary/absorbtion will be vastly different.