Secret Tunnel/Garage Update #4

Well i'm Surprised, Pleased and comforted by that discovery. What do you think, is it what you expected?

This is so cool!!! I dream about doing stuff like this to my house. Love the videos. Keep 'em comin'!!!😀👍👍👍

Not an engineer, but I work for one. We do a decent number of foundations that need reinforcement. The American code for my state I believe is 3" min from the edge of concrete to avoid rust, so concrete directly on steel would be sufficient for water proofing. Granted, I do not have the best understanding, but it seems to be backed up by the bunker test.

You should drive some ground rods and ground the whole structure

Yeah anybody in the Navy could have told you that yeah it's going to rust it's called electrolysis

Love the Look Mom No Computer tune on the end 😊

Please help Kala Tunnel Girl! Shes being attacked by TikTok Karens!

Look out my man you ain’t tell nobody that everybody that’s been viewing your tunnel building been looking at any guys with any type of construction background all automotive background or anything like that the deals with metal water and stuff like that knows that untreated steel that’s not treated for protection against water scraping up against it some type of anti-rust compound When you pour concrete and water which is scratching up against it when you pointed and that water is selling on that steel for a long period time is going to rush like HELL. You got to treat the panels that touch the dirt and concrete with some type of rust preventer barrier like a rubber coat some type of harden Aunt rust coat, waterproofing coat.. there’s gonna turn to rust…😳🤔🫡

Here in the US we have a spray called Rhino Liner. They put it in the beds of pickup trucks to provide a thick rubber coating which protects against rust and abrasion. The US Army did tests on it on cinder blocks, steel, and other materials. Stuff is amazing. It will protect the steel and make it extremely bomb resistant. Seems like a great investment if you want your hard work to last 100 years.

Sacrificial Anodes

One other thing - instead of coring the steel plate we would use a thickness gauge to measure residual thickness

Hey, concrete needs to be in contact with steel to provide protection then we waterproof the concrete in contact with the ground.

Im upset i missed the milk n tea mug

Paint silicone on it

So uhm...what happened?

It's gonna be soaking wet between the steel and plastic that's for sure

There is a trick to deal with rust, they use it on ships, get a big block of iron (that easily rusts) and weld it against your steel. The iron will rust like crazy and needs to be replaced at some point, but nature will barely let your steel rust as long as the iron can rust, and preserves the steel this way. Not exactly sure how to explain this scientificly, but it does work.

Poly against the steel + cathodic protection. Interview and ask an engineer from your gas company. Or maybe water utility.

THE POLYTHENE LIKELY TRAPPED MOISTURE CAUSING MORE HARM THAN GOOD. bUT NOW ALL THAT MOISTURE IS GONE IT LOOKS LIKE IT WON'T RUST FROM THE OUTSIDE ANY MORE THAN IT HAS DONE.

You talk to much about it, its secret for f--k sake.

you must be getting condesation

I've been thinking, you want to lower 2 cars
method 1: first car drives onto lift, but there's a trolley on it, lower the car and use trolley to move car, car 2 parks on the bare lift
mesthod 2: first car drives onto ramp normally, you have a very wide hydraulic jack to slide under to lift the car and move it, car 2 drives on.

you may have already completed the construction, but I recommend using waterproof concrete, which does not absorb humidity like ordinary concrete and thus does not allow condensation on the steel, but if you don't care that it will start to rust in 20 years... you can pour it with ordinary concrete.

I personally would paint with anti-rust paint and cover with waterproof concrete

Cooking oil

Slap on thick layer red oxide paint before concreting

Worried about the concrete more than a steel

the plastic creates gaps so imo its just worse. Concrete can pretty well seal the metal so nothing gets to it as long as there are no cracks.

The reason is resting is because there is no ventilation between the barrier and the metal there should be a somewhat void there, and you wouldn’t install some sort of breather so oxygen could get in between both and that is why it would keep it from being rusty

Industrial paint like they paint pipelines with seems like it'd be good. Epoxy paint or whatever it is.

Normal concrete is not waterproof, not even a little bit waterproof. Water goes right through. Water flows through soil and sand and gravel at a fast rate. It goes through clay at a very slow rate. Concrete is in between. If water settles to the concrete level, the concrete will absorb that water. When the concrete is saturated, the water will flow through to whatever is in contact with the concrete. It can seep in from the top, sides or bottom, if there is enough water, it will seep through. If you built a drainage footer beneath the concrete, this will mitigate most or all of the water seepage. Water will flow to the path of least resistance through the soil, sand, gravel to the drain. If there is no drain, the substrate around the concrete will either collect water and keep it near the concrete where it will seep through, or the substrate will dissipate the water and prevent it from seeping through. either way, steel that thick should last a minimum of 50 years with significant water contact. If the whole structure is welded water tight, you should have no leaks.

You’re better off having the concrete in direct contact with your steel. The alkalinity of the concrete will protect the steel for many years. Now the interior of your bunker is different though. Your intact Mill Scale is a Cathode and the steel beneath the Mill Scale is the Anode and the steel will actually rust in order to protect the mill scale. You can do two things to protect it. Condition your space in your bunker in order to keep your RH% at or below 40% or just paint the steel with a good rust preventative primer and a good alkyd top coat of a Matt finish of black since you like that color. The target is to keep the electrolyte away from the surface of the steel as corrosion needs 4 things to exist. Those are: Anode, Cathode, Metallic Pathway and a Electrolyte. We can’t do anything about the first three, but a good coating system will act as a barrier to prevent the Electrolyte away from the surface of the steel. Check with your local PPG paint store for what’s available in your area.

Not an engineer. Does steel need oxygen to form rust.

Well, probably not very useful, but in hot water heaters, sacrificial anodes are used. By passing a very small charge you can make metal deposit instead of corrode. At the very least, take readings to see if corrosion is happening? Because you obviously can't inspect now it's encased in concrete. Also too late now but don't some concretes have additives to prevent water absorption? The early comment is probably right though, those passageways are gonna last your life time lol.

what a cool thing, that the fastest and cheapest method was the best way to do it. 10/10 Collin!

You can run electric current into the steel like they do for natural gas main. Keeps it rust free foreverrr. And I've dug up main that's sitting in underground springs still looking brand new and shiney. While just siting in mud and water for a few decades.

Civil engineer with structural focus, a bit late to the give ideas but I would be more concerned about the concrete cracks to letting water in over the years. I would recommend use hydrophobic concrete to keep concrete from absorbing water. And it's better to protect the concrete from water than the steel by which I mean cover the concrete rather than in between steel and concrete that will make it wrost.

you should rebar it like a structural concrete pour and then it doesnt matter if the steels rusts through, it doesnt need to be there once the concrete cures

If your steel comes from China - made from scrap with loads of other metal impurities - then it will corrode quickly. Some narrowboats built from this poor steel from around the year 2000 already require replating. !!
If its good quality British steel, though this is rare these days, it should be fine - the rust itself shall form a barrier against further rusting

Why is this channel not shown as a sub channel from your main channel?

Merry Christmas Colin all the best buddy

The thickness of the concrete is the main way to increase lifespan of rebar. You don’t want a connection between steel on the outside to steel inside the tunnel. The supports keeping tunnel sections centered during casting would be my biggest worry

CO2 will slowly turn the cement into carbonate. The carbonate is just as hard but it doesn’t protect against rust. This reaction will occur slowly over a very long time and I would’t worry about it. Rust from the inside seems more likely. I’d keep the space in the tunnel dry. You don’t want to ventilate too much during hit humid days and have it condens on the walls; if that’s a threat youd need to heat the space to prevent it from happening. Whatever you are doing now seems to be working.

Didn't you have over 1m subs like a week ago? ......... curious

I like the idea of spray foaming on the outside before pouring concrete

oil

Wow, what a project. How are you managing to square this with building control, home insurance, party wall agreements? What's it costing just to get rid of the spoil?

we need update 5, how will the car go up and down and whats the covering when the car is below and how will you drive away ?

1 button for a Thunderbirds remove of the top cover and 1 button for up and down or ??

cover it in lano guard!!