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Does Rebar Rust? | rebar | Hướng dẫn thiết kế đẹp nhất

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Does Rebar Rust?
Does Rebar Rust?

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#Rebar #Rust.

rebar rust,steel corrosion,concrete deterioration,roman concrete.

Does Rebar Rust?.

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37 Comments

  1. You get the test at five days, Once you hit say the cure time roughly 31 days with the test pieces be more prone to cracking.

  2. You told that plastic particles or glass particles increase strength of concrete. But will you please explain this related with reinforcement bar. Thank you

  3. you know what? i've never even seen snow in my life, and as much as people talk about how nice it is, i think in the end i'm at a net positive.

  4. Adding glassfibers could also adds problems with recycling the concrete. Adding steel "fibers" makes it easy to recycle. So from an evironmental/sustainable viewpoint steel "fibers" seem to be preferable?

  5. In UK and many parts of Europe the standard highway bridge specifications require the application of waterproofing infusions, principally Silane that prevents moisture getting to the ReBar. This was first invented by Nazis 80 years ago to protect their new high level road bridges built as part of the Autobahn programme. These bridges were found to be prone to very cold temperatures due to the locations (mostly over gorges) and the excess amount of road salt used to keep them clear and safe.
    I see that your example of pouring a concrete slab shows virtually no cover to the ReBar!

  6. I like that you reinforce your videos with concrete data. Even if the measurement system is a bit rusty.

  7. I had a guy make reinforced concrete outside stairs and rebars were to close to the outside.
    All I know is water seeped in winter and salt came and the rust damaged the outer shell.
    Its cracked and leaking and I have to epoxy them now to make them waterproof…

  8. A car park laid with steel fibres as a local reinforcement was a disaster. As the concrete surface wore away, the steel fibres were partially exposed and damaged tyres,

  9. add 20 liter off latex milk every 12 cubic meter concrete. make concrete waterproof and strong bonding. try and you will know

  10. Memories…..my first job in construction was in 1983 and involved the complete removal / diamond sawing of damaged concrete from 3 office blocks. The sides of the buildings were ‘shaved’ some 12 inches and aluminum cladding added. They are still there 👍🏼

  11. The weak foundation of our modern society, all modern building engineering methods are a big fail. The builders of the ancient world now they were real engineers their buildings stand for thousands of years no rebar, ours well they will soon be gone, poor engineering…

  12. This video perpetrates an old wive's tale and reminds me of when I attended a civil engineering unit at university 40 years ago. Part of the unit was conducted in the civil engineering lab by a crusty old technician. He began the session by asking us which is stronger in tension – steel or concrete? Many chaps answered "steel" I don't remember any students picking concrete. The tech/lecturer sort of nodded slightly and then asked which is stronger in compression – steel or concrete? Chaps answered "concrete". He then sort of smirked.
    He then proceeded to demonstrate the strength of various concrete cylinders, about 250 mm long and 200 mm diameter, which we students had made the previous fortnight using various mixing methods. He put each one in turn in the hydraulic press and wound up the load until each concrete cylinder cracked and failed. They all failed well below the capability of the press.
    After discussing that care in mixing made a big difference in strength as shown by the test, he repeated his first questions: Which is stronger in tension – steel or concrete? In compression? The same students gave the same answers.
    I was looking at the hydraulic press, and realised that its jaws were made of steel. So I said "Steel is much the stronger, in tension AND compression". The tech/lecturer thereupon said "We've broken the record. Only one student this year can think. Usually I get 2 or 3."
    [Compressive strength of mild steel is around 580 MPa. Concrete is 20 to 40 MPa]
    Why do we use concrete? Because it's real real cheap compared to steel and just about anything else, and it's rigid. Folk don't want wobbly buildings. Why steel reinforced concrete? Because when overloaded or not properly made, it cracks, warning you, doesn't fail catastrophically without warning, and is fireproof. Concrete by itself fails catastrophically without any warning. In the 1920's and 1930's a lot of city buildings were built with steel frames. When they caught fire, the red hot steel lost strength and the buildings came down, usually upon next door. Concrete is a good thermal insulator – if a steel reinforced concrete building catches fire, the fire brigade usually has time to turn up and get control before it collapses. City fire brigades don't actually care much if a building is ruined by fire. But its a nightmare for them if the fire spreads to adjacent buildings and then more buildings. That's why regulations and conventions make buildings not so much resistant to catching fire, but resistant to collapsing.

  13. This explains the issue I'm having on my 9 year old driveway. The expansion joints have rotted out and, upon taking the wood out, I've discovered rebar run through them and frequent cracks in the concrete where this rebar goes through the expansion joint wood. The rebar has rusted inside the damp/rotted wood, expanded and cracked the concrete at the edge of the expansion joint.

  14. Used to work with a guy who coated all his rebar with oil prior to pouring. Not really sure how effective it was.

  15. Excellent presentation. What is your take on repairing various types of failures affecting concrete?

  16. Another way to prevent steel rebar corrosion is increase the cement in the concrete. Cl- ion can enter trough pores of the concrete.

    If we make the concrete with more cement (plus 350 Kg/m³), pores will be more little, so Cl- ions can´t to enter inside of the concrete and can´t to contact with stell bar.

  17. Great video and a lot of good information. There is also a way to protect the reinforcing steel bars using cathodic protection. I wish you would have mentioned cathodic protection, which can actively protect the steel members by shifting the potential of the steel in a negative (cathodic) direction, thus eliminating the anodic (corroding) areas. Cathodic protection is widely used in industry to protect steel and iron pipes, tanks, bridge decks, marine structures and so much more against corrosion. I belong to an international society of corrosion engineers called NACE International, which is based out of Houston, Texas. NACE Provides a lot of training and certification for corrosion engineering, cathodic protection, protective coatings, chemical inhibitors, and much more. I have been in the field of corrosion engineering for nearly 25 years. This is a growing field as corrosion costs the US economy hundreds of $billions annually. Internationally the costs go up to $trillions. Thank you!

  18. Sir,lohe ki saria me Jung lag gaya hai, pls koi achchha rust remover chemical batayiye, jo turant rust clean kar de,or market me mil sake…. pls……

  19. What about cathodic protection? This is a standard in the building industry as for other corrosion impacted industry.

  20. concrete against compressive stress
    steel against tensile stress
    due to the brittleness of stainless steel — would the use of stainless steel add to the compressive stress & DECREES tensile stress ???
    petescannova@gmail.com

  21. This is excellent! I live in Brazil, near São Paulo city. A lot of large cities in Brazil started creating barriers bellow road bridges so the homeless could not shelter there. This seems, to most people, inhumane – but the measure was taken to avoid fires bellow the concrete bridges. AFAIK, the heat can change the characteristics of the rebar and some of those fires aren't small. Also, the City of São Paulo offers temporary sleeping places for the homeless and some even have dog shelters so they can bring their pets with them.

    Could you talk a bit about how heat can damage the rebar? Thanks!

    (dogs are really important for the homeless because they offer protection, function as an alarm and, most important of all, offer friendship)

  22. With the extreme lack of maintenance we have here in Norway, I'm surprised that the government hasn't realized its better to pay a bit more to get a bit more safety and durability. But when it comes to government its always the lowest bidder that wins….

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