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Old 03-17-2013, 02:44 PM   #16
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Something seems to be eating concrete


It could if they used a cleaner on the coils, and the salts are still coming out of the pan, after the detergent dried. Also, depending on what is going on in the space that the hvac unit is in, it can pull stuff from the air through the system. Worst places for hvac systems is dry cleaners, styling salons, bakeries.

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Old 03-17-2013, 03:43 PM   #17
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Something seems to be eating concrete


This building is in South St Petersburg, FL with water on 3 sides of the city. The side we are looking at is on the west side which is the Gulf side, the breeze normally comes off the Gulf from West to East, so the breeze keeps any car pollution (which we do not have much of) away from this area. It is also far enough from the Water that I do not see any evidence of salt of my truck which is always parked on this back side a few feet away from this area. I do not think they packed the block with sand, I have been a tenant in this building for 20+ years and it has always been well maintained. I have lived in FL my entire life and around many block homes and buildings and never seen anything like this and why I posted the picture. At first glance, you would think it was termites but know they do not eat concrete just cut through it to wood. The only wood in the inside of this wall is PT furring strips with dry wall which is too old to be Chinese which is a major problem in our area. The interior walls use metal studs with drywall on them, the flat roof is on top of metal engineered beams. The landlord's first thought was rats, as the bait traps have been back there for years, but the top hole is too high for rats, plus no sign of them crawling on the debris piles. I am thinking it has to be something that deteriorated the concrete, and wonder if some US lab should look at samples of the debris as this apparent rapid and somewhat severe deterioration could cause structural issues in various concrete projects, like the bridge that collapsed in the Minnealpolis area a few years back.
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Old 03-17-2013, 03:48 PM   #18
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Something seems to be eating concrete


Only other thing, is someone chipping away at the block. As for the bridge in MN that collapsed, that was due to poor engineering, and maintenance of the structure. This is the official Fema report on the bridge http://www.usfa.fema.gov/downloads/p...ons/tr_166.pdf NTSB http://www.dot.state.mn.us/i35wbridg...inalreport.pdf The NTSB report tells the big story why it collapsed.
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Old 03-17-2013, 04:00 PM   #19
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Something seems to be eating concrete


The pile does not look like concrete. Looks like vermiculite possibly that was poured into the block cavities for insulation. A small hole is all that is needed to let it flow out.
The upper holes look very round as if something was fastened to the wall and knocked off.
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Old 03-17-2013, 04:21 PM   #20
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Something seems to be eating concrete


If this is in fact chemical erosion then it is localized and should not be a major problem. I think the paint normally would have protected the concrete block. It looks to me as if there is some evidence that the drain water got behind the paint and was trapped there which would make the problem worse as it would not be diluted by rain or dry out. Concrete block is not made of a particularily durable form of concrete as measures are taken to lighten the blocks for construction purposes. It is much easier to break, drill or chew as the case may be than poured slab or wall would be. The fact that it has not happened under other drains on the building would suggest this is a uniqe occurrence wether it is caused by acid or animals. Whatever the cause this is a very interesting puzzle and it may never be solved for certain. Othe clues might be suggested by determining the use of this space in the past
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Old 03-17-2013, 04:26 PM   #21
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Something seems to be eating concrete


This space has been vacant for 6+ months, prior to that it was a retail Mattress store for 10+ years. Nothing has been going on to cause this and landlord is baffled. I told him I would post on the internet to see if someone had a clue. The round top hole is PVC A/C drain outlet and power has been cut off to this unit for months, so no A/C run off since last summer. I will look at more closely tomorrow to see if the hole goes through the block into the cavity as you are right the debris looks too course to be sand, but still something ate away at the block suddenly to cause this. This was not there a few days ago as I am one of the few that parks back there everyday, it is a narrow alley way with a fenced boat high and dry storage directly behind it. Also there is a large metal dumpster a few feet away that keep the very light vehicle traffic through here away from tha part of the building. Usually only office or retail type trash in that dumpster although no telling what is dumped in there at night by the public.
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Old 03-17-2013, 04:28 PM   #22
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Something seems to be eating concrete


Pee by the local bums.
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Old 03-18-2013, 08:10 AM   #23
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Something seems to be eating concrete


Looks like loose vermiculite block fill to me, likely used for insulation, but could also be used to raise the fire rating of the wall.

Any chance the dumpster hit the building when the truck dropped it back down to the ground? How about the reciever hitch of a vehicle?
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Old 03-18-2013, 05:30 PM   #24
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Something seems to be eating concrete


Something seems to be eating concrete-concrete-teeth-marks.jpg

The material is coming out of the block and is apparently insulation of some type, in clearing it away you can clearly see teeth marks and the knawing goes all the way down to the ground. I am thinking that the poison from the bait traps are causing the rats to eat the concrete in an attempt to neutralize the poison. I do not know if they are wanting the material inside of the concrete block or eating the concrete but it is pretty clear that something is chewing it and would guess rats as someone said that only rats will eat concrete and that is my guess.
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Old 03-18-2013, 05:37 PM   #25
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Something seems to be eating concrete


it's possible you got some large wharf rats being that close to the water
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Old 03-18-2013, 06:38 PM   #26
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Something seems to be eating concrete


I just googled it,and the largest rat in North America is the Norway brown,at 1 and 1/2 lbs.
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Old 03-18-2013, 07:31 PM   #27
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Something seems to be eating concrete


My guess it is Roof Rats eating this wall, maybe even trying to get inside of the wall if you read this last part of this article. There is a Pet shop about 40 ft from these holes and maybe they smell the food inside it and the concrete below this drain was the weakest part of the building???? I did not realize they could/would eat through concrete but feel sure that is what is causing this.

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The roof rat ( Rattus rattus , a.k.a. citrus rat, fruit rat, black rat, or gray rat) is an introduced species of rat native to southern Asia. It was brought to America on the first ships to reach the New World and has spread around the world. This rat is the same species that carried the bubonic plague around the world and is also the reservoir host for murine typhus. Roof rats are the worst rodent pest in the state of Florida and most abundant. The Norway rat ( Rattus norvegicus ) that is familiar to most people is rare in Florida.
Roof rats consume and destroy stored animal and human food, attack fruit crops, and take up residence in attics, soffits, hollow walls, and out-buildings. When they invade buildings they chew through wires (potentially starting fires), gnaw through plastic and lead water pipes, make holes in walls and cause other structural damage.
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Old 03-18-2013, 07:41 PM   #28
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Something seems to be eating concrete


Quote:
Originally Posted by bxju View Post
Roof rats are the worst rodent pest in the state of Florida and most abundant.
I'm originally from South Florida and we had rats the size of large cats, I used to hunt them with my .22 rifle
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Old 03-18-2013, 08:19 PM   #29
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Something seems to be eating concrete


The roof rat ( Rattus rattus , a.k.a. citrus rat, fruit rat, black rat, or gray rat) is an introduced species of rat native to southern Asia. It was brought to America on the first ships to reach the New World and has spread around the world. This rat is the same species that carried the bubonic plague around the world and is also the reservoir host for murine typhus. Roof rats are the worst rodent pest in the state of Florida and most abundant.


Yes i see a lot of them around the citrus groves,and they are not very big at all.
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Old 03-20-2013, 02:12 PM   #30
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Something seems to be eating concrete


Something seems to be eating concrete-rat-updated-2.20.13.jpg

Taken 5 days after first picture

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