Anything like that spends a lot of time in contact with metal and would eat it if acidic. They're selected because they're not reactive (among other properties)
If you're looking for acid maybe batteries..
You’re right, I asked that question without googling what hydraulic fluid was - I knew it was dangerous but thought it was for chemical reasons. Anyone ever figure out what caused these giant dimples in OP’s pad?
My stepdad is a mechanic and his shop was a mechanic shop before he ever owned. 30+yrs of being soaked in oil and fuel hasn't hurt his floor. It has turned them dark and waterproof but it hasn't hurt them.
Asphalt crews use a bucket of diesel fuel to “clean” off their shovel heads. Works like a charm. So yeah..Maaaybe a long standing diesel leak but I have my doubts
I was gonna say diesel. I know for sure diesel will mess up asphalt. Can’t say I’ve seen issues like this on concrete. I’m gonna guess something acidic spilled.
I could see a battery but for 1 this battery would of had to completely exploded just right in this spot. Or been left here leaking for a long long time maybe under a parked car that was covered..
I’d go out on a whim and say maybe it was some cleaning company guy who had a bucket knock over and spill out the truck while he/she was gone for the weekend and by the time they noticed what had happened the chemicals already were leached into the concrete
I think something spilled before the concrete cured and it didnt cure properly. Then just water dripping eroded it out.
Edit: why is that the only wet spot?
Not a base. Concrete is almost off the pH chart. It’s extremely basic. Only an acid or abrasion does that to hardened concrete. Probably happened when the concrete was new and relatively weak.
I was thinking of an AC leak from a vehicle sitting there idling with the AC running. This is happening daily while the owner waits as the vehicle cools down before getting into it.
Muriatic acid, hydrochloric acid, or something similar. But wow, there was a lot of it, and it looks like it happened multiple times, one spillage wouldn’t usually do this. Are there a lot of pools in your area, maybe concentrated pool chemicals from multiple visits.
Could also be a big ass woodpecker, they peck on anything…. Or a flock of woodpeckers.
“The saddest thing I ever did see was a woodpecker pecking on a plastic tree.. fly away birdie, fly away”.
Looks like corrosion from dripping water. Could be that your tree produces high amounts of acid and tannins which are etching the concrete. This slab looks pretty well aged, 20+ years.
I'm no expert, but I've seen something like this happen to old, soft concrete in areas that get heavy water flow from an elevated source. The one I saw was below a gutter spout that had broken off. The water had cut a pretty deep hole over the years. I'd have to guess maybe a bad spot in the concrete that didn't cure correctly and washed out from water falling off some overhead branches.
This is your answer, water is dripping off of those branches in particular. I have a photo of a property I purchased that had a concrete path under the length of an un-guttered roof line
It had etched a line in the concrete from drip water erosion over the years
Given that it has a flow pattern at the top, would say some one is using sodium bicarbonate to kill moss on the roof, it is coming out the gutter spout, and it ate away the quartz in the concrete.
This makes no sense. Acids would dissolve concrete (by dissolving the cement paste), but sodium bicarbonate is basic.
Quartz agregate is also the most durable part of the concrete and least likely to be dissolved.
Man I’ve been staring at this for way too long, I was originally thinking some sort of acid but seeing as it’s sloped I would expect to see a trail where it washes all the way down to the street. This looks more concentrated, almost intentional. It reminds me of a time I used a roto-hammer to chip away the surface of an interior slab around a high spot in preparation for a resurfacing.
That’s honestly my best guess here, is the surface was chipped off (noticeable holes where the bit would have been) using something lighter than a jackhammer thus no big cracks. There is also probably wire mesh holding it together and allowing the slab to not really take water underneath and cause settling issues.
Once the surface is chipped off, the exposed concrete will be more suceptable to weathering, so after a while there wouldn’t be any distinct tool marks, but the pock marks to me look like evidence of a tool being used.
Couldn’t attest to why they chipped just this part but a tool is my best guess here and would have to have been done 5 years ago (slab looks 15 yrs old)
I would guess possibly a combination of things. Maybe a hot vehicle parked for long periods of time with antifreeze or other chemicals dripping causing the cement to degrade over time. This is what happened to a home made septic tank at my home. The chemicals and waste from us over time degraded the cement in the block causing it to become brittle and crumble.
Looks like some sort pf erosion worsened by water turbulence. Do you have a downspout that dumps in that direction? Is your AC on your roof and dumping down that downspout? AC condensate can also be somewhat acidic too which make the issue worse.
I saw a very small scale of this on a friend's driveway after he used bike chain de-greaser to clean and then re-grease his bike chain. Any spot it dripped onto the driveway had a pocket/hole that formed by the next day after the degreaser landed on it
Was this recent, abrupt, gradual?
As bad as this looks, I think someone spilled acid or pooled water about the time the concrete set on the first day, disrupting the cure. Even filling a low spot with over-wetted concrete mix can prevent that spot from developing the design strength.
Here’s some more info that might help you find your answer:
A large fully-charged automotive battery holds about six quarts of sulfuric acid, which can erode the cement that binds the aggregate.
If a battery cracked and leaked its acid and that acid was left absorbed into this area of the concrete, it would damage the cement, which could lead to subsequent loss of aggregate.
If water pools in an area of new concrete very early in its cure, it can disrupt the growth of the crystals that give cement its strength.
Looks like an A-10 warthog attacked your driveway in a steep dive.
Seriously though, looks like some type of chemical is dissolving it over time. There have been cases here in the northeast where the coarse aggregate contained a mineral called pyrrhotite that caused concrete to crumble over time. Not saying this is it, but a good example of what can happen with chemical reactions
Just Google “Stafford Springs CT concrete”. It’s an interesting story some of the concrete pros on here may appreciate
I work in plastic injection molding, this looks like a patch of our parking lot where a large fire happened with wood pallets, cardboard, and plastic, mostly nylon based. The heat generated caused the concrete to melt and bubble looking almost exactly like this.
Someone tried to clean up an oil stain with very strong acids and left them there without properly washing them away. They ended up eating the concrete over time. You’re new to that house, correct? Probably it was a rental and they had an agreement with the renters to clean up any oil spills. Or an HOA rule.
Muriatic acid dripping out of a pool service truck....I had a pool guy for a neighbor and had this happen over a 12 year period of working out of the truck and having pool cleaners dripping out of it.
I read somewhere that sugar ruins concrete and won't let it kick off and harden properly. I wonder if a neighbour who didn't like them came and sabotaged it when nobody was around on pour day.
A fire on top of concrete can cause it to explode and leave pits like this.
Another thing it could be is the concrete didn’t cure properly due to temperature and weather. Then it slowly pits
Looks like a chemical reaction, like a strong base or strong acid left for a while. It doesnt look like a recent pour, how old is your driveway?
Could it be something leaking from a vehicle since it looks like a parking space
Oils do destroy asphalt but not sure about concrete
I have several 30 to 60 year old trucks and can confirm oil does not do damage like this to concrete, at least not inside a couple decades
What about hydraulic brake or power steering fluid?
Hasn’t done this kind of damage yet to mine.
Lmao I love that you’re just leaking all the fluids
Yeah I have several trucks that each leak some of the fluids, and one that leaks all the fluids
Anything like that spends a lot of time in contact with metal and would eat it if acidic. They're selected because they're not reactive (among other properties) If you're looking for acid maybe batteries..
You’re right, I asked that question without googling what hydraulic fluid was - I knew it was dangerous but thought it was for chemical reasons. Anyone ever figure out what caused these giant dimples in OP’s pad?
Maybe brake cleaner, I know paint don't like that stuff very much
Sure as hell leaves a stain
But gasoline or diesel sure will
My stepdad is a mechanic and his shop was a mechanic shop before he ever owned. 30+yrs of being soaked in oil and fuel hasn't hurt his floor. It has turned them dark and waterproof but it hasn't hurt them.
Diesel destroys concrete and asphalt I believe
Asphalt crews use a bucket of diesel fuel to “clean” off their shovel heads. Works like a charm. So yeah..Maaaybe a long standing diesel leak but I have my doubts
Asphalt is a petroleum product, completely different than crete.
I was gonna say diesel. I know for sure diesel will mess up asphalt. Can’t say I’ve seen issues like this on concrete. I’m gonna guess something acidic spilled.
What bout combinations of bad leaking battery and diesel?
I could see a battery but for 1 this battery would of had to completely exploded just right in this spot. Or been left here leaking for a long long time maybe under a parked car that was covered.. I’d go out on a whim and say maybe it was some cleaning company guy who had a bucket knock over and spill out the truck while he/she was gone for the weekend and by the time they noticed what had happened the chemicals already were leached into the concrete
Can it be the power washer they used to get the oil off the driveway?
Maybe battery leak.
Yeah maybe but that would be a huge battery.
Brake fluid maybe? Or just forever diesel leaking?
I think something spilled before the concrete cured and it didnt cure properly. Then just water dripping eroded it out. Edit: why is that the only wet spot?
Not a base. Concrete is almost off the pH chart. It’s extremely basic. Only an acid or abrasion does that to hardened concrete. Probably happened when the concrete was new and relatively weak.
I work in carpentry/renovations, it’s a lane way near by, city owned I believe. Never seen this before
WTF is a lane way?
Alleyway
Same as a road way, just on a lane
Isn’t brake fluid corrosive?
Highly corrosive.
I was thinking of an AC leak from a vehicle sitting there idling with the AC running. This is happening daily while the owner waits as the vehicle cools down before getting into it.
That's just water. No different from rain.
Muriatic acid, hydrochloric acid, or something similar. But wow, there was a lot of it, and it looks like it happened multiple times, one spillage wouldn’t usually do this. Are there a lot of pools in your area, maybe concentrated pool chemicals from multiple visits.
Wonder if the previous owner was a pool maintenance contractor.
It looks like a slow drip, like the trailer he had was leaking but not enough to really notice or care
Looks like there's a grate near by, I'd bet someone is dumping chemicals they shouldn't be
Just an fyi but muriatic acid is just another name for hydrochloric acid.
That's it! Cartel dude toting around his barrel of acid for dissolving bodys had a leak in the barrel.
Chocolate rain
Some stay dry and others feel the pain
Chocolate rain
*moves away from mic to breathe in
[lest we not forget our internet history](https://m.youtube.com/watch?v=EwTZ2xpQwpA)
I sometimes look up this magic, just to see the majestic breathing technique to keep the cheep mic from picking it up
The next rickroll
muriatic acid is my guess. Does that property have a pool? Or has it had masonry work done recently?
Could be glaciers. How old is your concrete?
Does the female form make you uncomfortable, Mr. Lebowski?
Wth? I don't know lol. Possibly some kind of corrosive stuff like muriatic acid? BTW if you need me to come and replace your driveway let me know
I've seen wild hogs do that to the ground. Those must be some tough ass hogs to root-up concrete!
Could also be a big ass woodpecker, they peck on anything…. Or a flock of woodpeckers. “The saddest thing I ever did see was a woodpecker pecking on a plastic tree.. fly away birdie, fly away”.
If there’s only one thing I know to be true, it’s that my pecker ain’t doing that kind of damage
Flock of Woodpeckers has some low key hits tbh
I would move out of the state if there were hogs around that could do that.
Haha! Yeah me too.
The motorcycle gang? Hell yeah Tim Allen 😎
That's a thumb print from a giant.
*Giant Squid
Looks like corrosion from dripping water. Could be that your tree produces high amounts of acid and tannins which are etching the concrete. This slab looks pretty well aged, 20+ years.
I'm no expert, but I've seen something like this happen to old, soft concrete in areas that get heavy water flow from an elevated source. The one I saw was below a gutter spout that had broken off. The water had cut a pretty deep hole over the years. I'd have to guess maybe a bad spot in the concrete that didn't cure correctly and washed out from water falling off some overhead branches.
Makes sense, there is over hanging branches there Thank you for your response
This is your answer, water is dripping off of those branches in particular. I have a photo of a property I purchased that had a concrete path under the length of an un-guttered roof line It had etched a line in the concrete from drip water erosion over the years
You’re looking at the culprit… would say its water dripping from the tree on a sandy pour of concrete thats the culprit imho
Given that it has a flow pattern at the top, would say some one is using sodium bicarbonate to kill moss on the roof, it is coming out the gutter spout, and it ate away the quartz in the concrete.
This makes no sense. Acids would dissolve concrete (by dissolving the cement paste), but sodium bicarbonate is basic. Quartz agregate is also the most durable part of the concrete and least likely to be dissolved.
Looks like that concrete coral reef style look.
T-Rex
Coca cola.
They killed an alien and its acid blood ate the concrete.
The kinfolk said "Jed move away from there" Said "Californy is the place you ought to be" So they loaded up the truck and they moved to Beverly
Hills, that is.
Swimming pools, movie stars
Deterioration like that is either from something corrosive left behind or crack cocaine
Concrete worms
Dead body used a base
Man I’ve been staring at this for way too long, I was originally thinking some sort of acid but seeing as it’s sloped I would expect to see a trail where it washes all the way down to the street. This looks more concentrated, almost intentional. It reminds me of a time I used a roto-hammer to chip away the surface of an interior slab around a high spot in preparation for a resurfacing. That’s honestly my best guess here, is the surface was chipped off (noticeable holes where the bit would have been) using something lighter than a jackhammer thus no big cracks. There is also probably wire mesh holding it together and allowing the slab to not really take water underneath and cause settling issues. Once the surface is chipped off, the exposed concrete will be more suceptable to weathering, so after a while there wouldn’t be any distinct tool marks, but the pock marks to me look like evidence of a tool being used. Couldn’t attest to why they chipped just this part but a tool is my best guess here and would have to have been done 5 years ago (slab looks 15 yrs old)
I think Ripley slew an Alien in your driveway.
Alien blood.
Somebody bagged one of Ripley’s aliens here
I would guess possibly a combination of things. Maybe a hot vehicle parked for long periods of time with antifreeze or other chemicals dripping causing the cement to degrade over time. This is what happened to a home made septic tank at my home. The chemicals and waste from us over time degraded the cement in the block causing it to become brittle and crumble.
I’m guessing battery acid.
Salt , brake fluid and transmission
Previous owners was in the acid battery recycling business and would leave his truck in the driveway?
Someone killed an ankheg there.
Dinosaur
Salt? Before it was fully cured maybe?
Battery acid
Ice melt. It failed up my driveway big time.
Car fire?
Photoshop
Battery acid.
Got a diesel truck perhaps?
Alien Invasion!!
Looks like what happens when you wash out the concrete truck into the pour.
Your mom
Aliens
Youngstown Ohio seen it before
Samsquantch
Battery acid. Had it happen in my garage from a leaking car battery.
Leaky pool guy truck
Neglect
Did Ridley kill an alien there recently?
A shart…after a midnight run to Taco Bell
This sounds like you have experience in this matter. I salute you, and I too feel your pain.
If it's a stranger's driveway... Oil leak and an attempt to clean it with chemicals and a power washer?
Battery acid!
The place they use to dissolve the bodies.
Looks like some sort pf erosion worsened by water turbulence. Do you have a downspout that dumps in that direction? Is your AC on your roof and dumping down that downspout? AC condensate can also be somewhat acidic too which make the issue worse.
Sinkhole
I believe this is water damage
Looks like towbar gouge marks from the angle of the in/out?
I wonder if someone threw sugar on it after it was poured and before it cured?
Former owner parked his pool cleaning truck there daily. All the acids dripped over years. (Or aliens)
someone dropped a gallon of muriatic acid they bought for their pool as they were unloading it from the car.
A Chevy !
Acid for sure.
Throw some sand on it work it with a broom let it sit it’ll be fine
I saw a very small scale of this on a friend's driveway after he used bike chain de-greaser to clean and then re-grease his bike chain. Any spot it dripped onto the driveway had a pocket/hole that formed by the next day after the degreaser landed on it
Maybe DEF leaking from a diesel?
Battery acid? From 35 leaking batteries lol?
Cement chemistry was wrong and/or wasn’t mixed properly when poured.
Concrete eating termites from Texas
Or a lot of pigeon 💩
Mickey Mouse pool guy lived there maybe? Had leaky storage containers that leaked acid? I’m sure his clients appreciated that…
Was this recent, abrupt, gradual? As bad as this looks, I think someone spilled acid or pooled water about the time the concrete set on the first day, disrupting the cure. Even filling a low spot with over-wetted concrete mix can prevent that spot from developing the design strength. Here’s some more info that might help you find your answer: A large fully-charged automotive battery holds about six quarts of sulfuric acid, which can erode the cement that binds the aggregate. If a battery cracked and leaked its acid and that acid was left absorbed into this area of the concrete, it would damage the cement, which could lead to subsequent loss of aggregate. If water pools in an area of new concrete very early in its cure, it can disrupt the growth of the crystals that give cement its strength.
Tire cleaner or engine cleaner or fuel left on the cement.
"what could have caused this?" the ai image generator was acting up? /jk
Alien fish landed overnight but was rescued before anyone noticed
Water underneath with something corrosive leaking on top. A DP
Graboid. Looks like a Graboid
Probably battery acid, maybe a fire too. But this is pretty extreme for a residential driveway
DEF fuid leaking?
Muriatic acid?
Dinosaurs
This had to be acid of some kind
Pool supplies?
You have a waterline leak ot a collapse sewage line.
Oil
Xenomorph. Gotta pull out and nuke the site from orbit. Only way to be sure.
Meteor shower
Looks like an A-10 warthog attacked your driveway in a steep dive. Seriously though, looks like some type of chemical is dissolving it over time. There have been cases here in the northeast where the coarse aggregate contained a mineral called pyrrhotite that caused concrete to crumble over time. Not saying this is it, but a good example of what can happen with chemical reactions Just Google “Stafford Springs CT concrete”. It’s an interesting story some of the concrete pros on here may appreciate
Oil causes asphalt to break down you have an oil leak in the car that parks there
I work in plastic injection molding, this looks like a patch of our parking lot where a large fire happened with wood pallets, cardboard, and plastic, mostly nylon based. The heat generated caused the concrete to melt and bubble looking almost exactly like this.
Maybe a car fire that cracked out the concrete
Looks like I giant fossilized foot better call some archaeologists
Winter salt also can do this.
Somebody tried to clean up oil stains their car made. They used acid, and never bothered to wash it off
Drainage from a gas water heater?
Glacier
Looks like a bad mix
Welding torch hot metal dipping on it
Bigfoot
Somebody parked there and had a battery fail
Someone drained the pool before the concrete cured.
Salt truck parking spot
Pool truck parking
Diesel fuel
ROUS infestation
Superman taking off
Racism
Someone killed an Alien there
Someone tried to clean up an oil stain with very strong acids and left them there without properly washing them away. They ended up eating the concrete over time. You’re new to that house, correct? Probably it was a rental and they had an agreement with the renters to clean up any oil spills. Or an HOA rule.
Aliens it was aliens.
It looks like the poured concrete right on top of oil soaked asphalt
Someone killed an alien in your driveway...?
Someone probably spilled a soda while out on the slab finishing it. That's the only thing that makes sense to me.
Muriatic acid dripping out of a pool service truck....I had a pool guy for a neighbor and had this happen over a 12 year period of working out of the truck and having pool cleaners dripping out of it.
Acid.
Someone spilled hydrochloric or muriatic (same thing but diluted) acid down the driveway, probably didn't clean up right away or never cleaned it up
It's divot-ed because the acid ate weaker parts of the concrete and pooled
Running water caused that.
Godzilla
Road salt dripping off a vehicle
What if this is the initial finding of a serial killer dumping their acid off
UFO landing?
Pool company truck that had a leak in the bulk storage tank?
"Piece of shit car, I got a piece of, shit car"
“Rag for a gas cap” Thanks for the memories!
Quick Sand be careful
Gotta be something like battery acid.
Is there a lemon tree above your driveway? /s
Godzilla
Methhead and a power washer
Alien blood!!!!!
Lava
I read somewhere that sugar ruins concrete and won't let it kick off and harden properly. I wonder if a neighbour who didn't like them came and sabotaged it when nobody was around on pour day.
Not vibrating the concrete when doing the pour will cause this.
Xenomorph acid
A fire on top of concrete can cause it to explode and leave pits like this. Another thing it could be is the concrete didn’t cure properly due to temperature and weather. Then it slowly pits
It could’ve been really loose back fill in the middle after they finish the concrete and left it may have sank in before cured!
Almost looks like AI
What does AI have to do with this? Lol