What are the potential problems with unventilated craw spaces? (totally enclosed concrete under concrete floor
406675
Moisture retention will be the first problem...it's usually not heard of for mold to go all of the way through concrete, but it is possible.
439690
Check out what was done on the World Trade Center buildings. They had about the same problems with water in the soil but they are a lot farther away than 1.5 meters. I'd start with a pile-driver to hit solid earth and build the entire thing above sea level. Mother Nature's Ocean will get in.
783788
No No andNo.   I just saw a news broadcast (locally) that spotlighted the lingering long term effects about this very scenario.......You need to call your health dept and find out if the landlord had it "Properly" cleaned out.....fresh paint doesn't cut it!!!!
1030037
You need to call city hall and get the number to the Code Enforcement division.  Every city has a Code Enforcement office, lodge a complaint and they will send an inspector to do an investigation.  If there are violations then your neigbors will be cited and asked to make the adjustments necessary to avoid further violations.  They keep it confidential and will not tell your neighbors who reported them to avoid any possible retaliations.\n\nI had to once report a family who was housing another family in their garage.  My only concern was that there were small children and infants residing in a cold poorly isolated conditions.  It basically forced their parents to seek proper living conditions.\n\nBelieve me, my way is the safest and the legal way to go about things.
368508
I have not found any one source. This requirement entails research based upon need. Such as below soil mean temperatures that will vary to a certain depth which vary in accordance with density of the subsoil. In construction most General Contractors can advise on Frost levels and drainage which are your primary concern (perhaps). In building airports there are charts that provide "prevailing wind" information. Some of these also give ground or surface temperature readings. These are available through Government publications.
1002505
http://uk.ask.com/web?o=0&dm=all&qsrc=19&q=recompression+chambers\n\nlook here it may help you.
771041
It is the condition where a building has so much air pressure inside that the doors won't stay shut.
694833
If material was released into the air and they didn't clean the place well it could be in the carpets, cabinetry, false ceiling, and air ductworks or air conditioner. It's shouldn't be in the plumbing, or radiating from the walls, unless of course they still have a big stash hidden there but if the police were smart enough to use dogs they shouldn't have missed anything. Pull off any air vent covers and vacuum them out well and  the vents too. Empty shelves and cupboards, (look for false panels), and scrub them out. Then at least you won't be worried about it.
1054277
Here's what I would suggest:\n\n1.  Do your homework!  Make sure you are familiar with the procedures you intend to follow.  Starting in without having prepared yourself is a recipe for disaster.\n2.  Familiarize yourself with the laboratory.  Make sure you know where the fire extinguishers, emergency showers, eyewash stations, spill cleanup kits, and exits are located.\n3.  Take note of where chemicals are stored.  Acids, bases, and flammables should all be stored separately.  If you take something out of one of these storage areas, be sure you put it back where you found it.\n4.  Always, always wear your PPE (personal protective equipment).  This includes apron or labcoat, goggles or safety glasses with side shields, appropriate gloves when working with chemicals, face shield if working with particularly toxic or otherwise dangerous chemicals, long trousers, a long-sleeved shirt if you're wearing an apron, and sturdy shoes (no sandals!).\n5.  Always work in a properly ventilated laboratory hood.  Your lab hood should have a face velocity of at least 100 ft/sec for working with most organic chemicals.\n6.  This is the most important safety precaution of all.  If you are not sure how do something safely, ASK.  Ask a professor, ask a supervisor, ask a lab TA, ask SOMEBODY.  If you don't get an answer that you feel will allow you to work safely, then don't do anything.  Work safely or not at all.
1182248
Sometimes insects such as flour beetles and other pests can get into food that is not stored in airtight containers.  Most cracker and cereal boxes tend to be simple cardboard, with the goods wrapped in wax paper or the like.  Most of them don't even offer a rudimentary seal.  If there are household insects about (and most healthy houses have a few, the only homes that are completely insect free are ones with massive toxic leaks or radiation problems) they can find their way into the box and thrive on the yummy carbohydrates.\n\nTo prevent it, throw out any known infested foods, carefully clean everything in the cupboards and cabinets (especially corners and cracks where crumbs linger), and store food in sealable plastic containers (i.e. Tupperware).  You then have the problem of moisture getting into the airtight containers and making the food soggy, or even moldy, but you'll be less likely to get bugs.\n\nIf it's any consolation, the little bugs and beetles that infest food stuffs are themselves edible.  Completely harmless, non-toxic and an insignificant source of protein!
732238
Any floor excercises?!
1138257
The below site has the information\n\nPalm-Kernel Shell Concrete For Structural Use – A Preliminary Investigation \n\nhttp://www.ajol.info/viewarticle.php?id=21174
234893
Concrete slab floors which have been sitting on clayey soil for a few years are susceptible attacks from sulphates in the soil, this can cause cracking in the floor slab.
944335
Because otherwise people would be forced to work in dangerous conditions and there'd be nothing you could do about it. You could be asked to work on a wet floor or with no safety gear when working machinery.Thats all the info you need unless you enjoy pain!
716572
No Air --> No Pressure --> You explode from inside
437376
Waiting for proper weather to ensure a solid set. If it's too dry or too humid, too hot or too cold, the concrete may not set properly and will need to be removed and repoured.
375789
A concrete velodrome is no different from any other concrete structure.  The design will first specify a design of the base including information on soil compaction.  The concrete design itself will have steel rebar.  In some construction, a fiberglass filler is added in addition to or as a replacement to the rebar.  Concrete is extremely strong in compression, but very weak in tension.  Alternatively, a design could be made using pre-stressed concrete.  This method uses steel cables and plates to place the concrete under significant compressive stress.  This prevents the deflective load from placing the concrete under tension.  Tension stress is what ultimately causes the cracks.