Post 13I can't believe this thread has gotten this far, without anyone yet mentioning "reactive armour". I mean, it's only logical to encourage the progression of things....
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Post 13I can't believe this thread has gotten this far, without anyone yet mentioning "reactive armour". I mean, it's only logical to encourage the progression of things....
That bullet has a strange expansionEnjoy
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If you are not following the correct way to test your ready mix,,, or your contractor got a barge load at a very low price per ton… I would say you have those issues…. Your mileage may vary..So why are the Roman Aqueducts standing 2000 years later, and the parking garage at my office, that’s about 30 years old, is falling apart? What was their secret for such tough concrete?
So why are the Roman Aqueducts standing 2000 years later, and the parking garage at my office, that’s about 30 years old, is falling apart? What was their secret for such tough concrete?
Adding to that.Roman’s used volcanic ash/lime which made for incredibly strong concrete.
There are several studies on it.
Sirhr
Yeah it almost looks backwards or something. Psh. Engineers….That bullet has a strange expansion
The other sorta strange thing in that article was their interest in the case, before and after firing. I didn't read it carefully, just skimmed it.Yeah it almost looks backwards or something. Psh. Engineers….
I had always heard it was the volcanic ash, but that never made sense to me, and it's not like we don't have access to it, and how much different than fly ash could it be...? This is the first I'm hearing of the large limestone inclusions making it self healing, but that makes perfect sense. It's not that it never cracks or degrades, it's that it naturally fills these in. Also interesting about the sea water, because those Roman concrete piers on the coasts are by far more incredible than even the aqueducts still standing.
It is a nice area, but 15 miles away there are areas with an abundance of criminals. I am worried about being targeted. Those people are often looking for a score, and hoping for little resistance. All it takes is for someone to open the front door to the wrong person, and then anything is possible.And, if your chosen home location necessitates bullet proof walls, floors ceilings, etc… Fucking move.
Volcanic ash probably performs about like fly ash. It actually doesn’t make the concrete any stronger, just makes it flow better without making it too much hotter to work with. It works great if kept to a very small percentage, but too much ash actually just weakens the concrete. Funny thing about that is the wizards at the DOT all insist on using fly ash in concrete and the idiots in the next office are saying to quit burning coal which produces fly ash.I had always heard it was the volcanic ash, but that never made sense to me, and it's not like we don't have access to it, and how much different than fly ash could it be...? This is the first I'm hearing of the large limestone inclusions making it self healing, but that makes perfect sense. It's not that it never cracks or degrades, it's that it naturally fills these in. Also interesting about the sea water, because those Roman concrete piers on the coasts are by far more incredible than even the aqueducts still standing.
People used a lime / sand mixture in the old days. Lime is self healing and becomes limestone again with time.So why are the Roman Aqueducts standing 2000 years later, and the parking garage at my office, that’s about 30 years old, is falling apart? What was their secret for such tough concrete?
There is a plague in west Travis Co. in Austin where new Gunite swimming pools are falling apart within a year of being built. They are referring to it as 'pool cancer.'Volcanic ash probably performs about like fly ash. It actually doesn’t make the concrete any stronger, just makes it flow better without making it too much hotter to work with. It works great if kept to a very small percentage, but too much ash actually just weakens the concrete. Funny thing about that is the wizards at the DOT all insist on using fly ash in concrete and the idiots in the next office are saying to quit burning coal which produces fly ash.
I've used superplasticizers on a few thin table tops and shooting benches , I'm amazed how well it works and how hard the finished product is.A high performing concrete using mid-range water reducing products will create a hardened (5000psi) barrier but that needs to be held together, reinforced. I'd use a healthy dose of Forta Fiber in it. When we remove concrete, that stuff is the most difficult.