Intro to corrosion in concrete 

thanks my guy, concrete maniac!

My undergrad professor just made us memorize that chemistry equation without much explanation. This is amazing, thank you!

Outstanding!

Thank you! Very helpful

Thank you sir 👌👍

Really impressed

Ohh God Why are you so Underrated ???

All the best for your Concrete movie 🎥🍿

wow you are sooooo goood at explaining :)

@tyler ley About the Seaside FL condo. I'm not sure why the city and county ignored the 2018 report of Spalling on the pillars.

The volume of Fe2O3 is less than that of Fe(OH)2. Source: Mehta and Monterio,2006.

Can you do a video on how to repair reinforced concrete that is showing these signs? I really need some info. I have been trying to keep it dry. But, I'm in Portland Oregon. 16 story building, top floor is reinforced concrete. It has two massive exhaust fans, and a really expensive cooling tower. The floor is already showing signs of failing, 60+year old building. My boss doesn't seem to care. I think the worse case scenario. IDK what to do. Any help would be great. Thank you for your time and efforts in making this channel, and the videos.

I think you forgot to mention that if dissimilar metals are both encased in the concrete such as galvanized steel (zinc coating) connected to the rebar either by directly touching it or maybe it is electrically shorted to it, the zinc will become an anode relative to the rebar cathode. This causes the pH around the anode to go down and thus corrodes. You can see this by spraying phenolphthalein onto the roughened concrete surface or broken cross sections. In building slabs, if you test an area experiencing rust and the concrete pH is too low for the phenolphthalein to turn pink and then you test an area 12 inches away with no metal in it and it turns pink, the metal with low pH encasing it is likely electrically continuous to a more noble metal.

Hi Tyler, I have a question and seek your opinion please. I poured a house slab two years ago and it has been exposed to weather.ie had to place project on hold. The house slab is 25mpa and not 20 mpa, well placed, no cracking but only has 20mm cover. although I am about to start building I am concerned about possible corrosion. without taking a core, do you think I am overly concerned or could it be a issue?. slab is away from coast and no chloride s or sulphates present. thanks

So, based on what you said, most concrete restoration today, where they jackhammer out the spalled area, clean the rebar, and patch the area with new concrete, will only make things worse due to the difference in ph between the old concrete and the new concrete in the patch?

Thanks for your explanation. Dr. Ley how do you determine chloride ions in concrete?

Corrosiong in Concrete sewers: Crucial research helps keep sewer corrosion at bay Concrete is the most commonly used material in sewers, especially for large sewer pipes, which can be attributed to its strength, durability and relatively low maintenance costs. Read More: www.gcoportal.com/corrosiong-in-concrete-sewers-crucial-research-helps-keep-sewer-corrosion-at-bay/

This video might be getting a lot more views soon. #surfside

hello Dr. with which FEM program will can simulate corrosion in RC structure please thank you

How about use STAINLESS STEEL REBAR!

So in future videos, do you think we should be testing the PH in concrete. I already do it in my garden and pool.

Or you can simply use fibreglass or basalt fibre rebar 😎

The explanations in two videos are contradictory! In this video, it stated that Iron Hydroxide is referred to as black rust, while in another video (ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-BqpLDm_InQg.html), it mentioned that Iron Hydroxide is present in the passive layer. would you please clarify it?

can we get its written literature, because the way of your explanation is appreciable. PLEASE I am in urgent need of that