i want to pour a concrete slab and need help please?
140357
Are you sure you want to pour and mix this yourself??  When my husband and I did the cement around our pool, it was about that size and we had the cement brought in and poured.  It really wasn't that expensive, but a lot better on the time factor.
519144
drop a concrete block on it
290650
There are several types of tests for testing the strength of concrete in various ways but the most common is the compressive testing.\n\nASTM C 31/ C31M-03 allows for three different sizes of cylinders (first number is diameter): 4"x8" (100mm x 200mm), 6" x 12" (150mm x 300mm), and 9" x 18" (225mm x 450mm). They have to be prepared in a very specific manner, they are to be filled in equal layers (the number of which dependent upon the cylinder size) and each layer rodded 25 times.  After the first layer all subsequent layers should have the rod break about 1" into the layer below it.  Here's the number of layers each size cylinder requires: 4"-2 layers, 6"- 3 layers, 9"- 4 layers.  On the top layer you have to heap it over the top before rodding and if it falls below the top you have to stop and add more concrete then continue rodding.  After that you strike the top off flat and put it in a safe place.\n\nFor compression testing of cylinders you'll refer to ASTM C 39/C 39M.  Basically you have to use either a steel cap with neoprene padding or a bonded cap that is messy and stinks to high heaven when being applied.  You have then zero the machine and start applying load.  You can either run a metered advance all the way or you can apply load at an increased rate up to 50% of the design strength.  The loading rate has to be between 20 psi/second and 50 psi/second.  Some bodies have a tighter requirement of say 35 psi/s +/- 7 psi/s.\n\nAs far as running the machine if it's digital you'll have a scale that says "pace deviation" you will want to put it on the zero there during the second half of the loading, be gentle in your adjustments otherwise you risk having one break with no warning.  Once you get it in the middle it should stay there till right before the cylinder goes, it will start moving to the minus side and lower the loading rate.  You are not supposed to continue adjusting it during this phase, you have to let the cylinder fail (or you can stop it right before it goes off the minus side of the scale to avoid having to clean up a mess).\n\nIf you're using a newer machine you can hit "stress" and it'll tell you the PSI or you'll have to divide the pounds of force applied by the area of the top of the cylinder (Pi r^2) to get the pounds per square inch.\n\nHow violent the concrete fails will be dependent upon the strength of the concrete.  A 4000 psi concrete doesn't make much sound... an 8000 or 9000 psi concrete sounds kinda like a gun going off and can send stuff flying across the room.  The machine i used this summer i blew the door off of on atleast 3 seperate occasions and on one of those it sent a good sized chunk of concrete flying about 15 feet across the room.
545032
I work with a builder in the DFW area that does that.  Shoot me a message with more specific questions.\n\nThanks, and good luck.
910954
Concrete---\n\n\n\nConcrete is a construction material that consists, in its most common form, of Portland cement, construction aggregate (generally gravel and sand) and water.\n\nConcrete does not solidify from drying after mixing and placement; the water reacts with the cement in a chemical process known as hydration. This water is absorbed by the cement, which hardens, bonding the other components together and eventually creating a stone-like material.\n\nConcrete is used more than any other man made material on the planet[1]. It is used to make pavements, building structures, foundations, motorways/roads, overpasses, parking structures, brick/block walls and footings for gates, fences and poles.\n\nAs of 2005 about six billion cubic meters of concrete are made each year, which equals one cubic meter for every person on Earth. Concrete powers a US$35 billion industry which employs over two million workers in the United States alone. Over 55,000 miles of freeways and highways in America are made of this material. The People's Republic of China currently consumes 40% of world cement production.\n\n\n\nFOR MORE INFO\nUSE THIS LINK--\n\nhttp://en.wikipedia.org/wiki/Concrete\n\nHOPE THIS HELPS
260924
You need to have a set of plans showing the dimensions and location of the foundation and the columns. Columns are made of concrete or steel and they need to be built in a very precise manner, because the steel beams that will be mounted on the columns are designed to fit precisely, and if they do not fit properly, the building will be unsafe and could even collapse.\n\nIt requires very precise measurements, made using high precision scientific instruments, to do the job successfully. Trying to do it cheaply, with inferior equipment, such as a measuring tape, is not likely to produce good results, and could create problems that may be very expensive to fix. Therefore, its not something you should try to do yourself. I recommend that you hire an experienced construction surveyor, or a contractor with personnel who have been trained to perform construction field engineering. If you hire a professional, and something goes wrong, they will bear the liability, but if you try to do it yourself, and you make a mistake, you will be stuck with paying to fix the problem.
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.
866685
If the soils removed from the excavation aren't too wet then use the same soils. \n Why do you have post tension cables on a slab on grade design?\n If you are trying to bring the subgrade level across the whole floor area to minimize the purchase of extra concrete ,then sand would prob. be the way to go.
759987
Do what they do at concrete batching plants. Get out your bucket wheelbarrow and shovel.\nTrial and error on small batches as the properties of the materials can vary from place to place. Strength also requires greater input of cement and hence more cost.\nSuggest you go to the local concrete batching plant and ask for an indicative mix for 20, 25, 32MPa strength concrete.\nGood luck.
735435
261360(!) assuming none have to be cut or get broken best order about 262.000 to be on the safe side. (The calculation is 4 slabs per sq yd and there are 4840 sq yds in an acre so you get 13.5 x 4840 x 4)
1104551
I do not know about British standard but I would poor at least 15cm thick fiber reinforced slab. If no fiber you may want to throw down a 15x15cm (or similar) steel reinforcing mesh. \n\nIf you intent to put lifts then you must beef up the floor to support the structure per manufacture’s recommendations.\n\nGood luck
626608
I don't know what a license in concrete is but I hope you realize that you will be very vunerable to law suits from who knows who all. If anything goes wrong they will blame the concrete and you'll have a law suit.\n\nYou can provide perfectly good concrete but it can get really screwed up by people who don't know what they are doing. \n\nYou should have a serious insurance policy to protect yourself.
1062234
Use the regular "concrete mix design" and add a "water reducing admixture".\n\nThe water reducing admixture type should be selected so that it does not require a reduction in the amount of "cement" that was in the original concrete mix design.\n\n(Note that a standard concrete mix design includes such things as __% of aggregate (rocks), __% of sand, __% of cement, __% of ash, __% of water, etc. and it does not normally include a water reducing agent.  It would be an additive supplement.)
661128
there is no thumb rule or some defined distance for that. all what you do is keep half meter distance and of-course it depends upon the KW of the power cable. and if you do not have enough space for keeping distance you can make a concrete slab in between
927962
if your looking to make a back ground.... just look them up online there are sevreal premade layouts! so we dont have to go through all the trouble! kk  ; )
135914
Dear mr./ms. engineer, \n\nProducing ceramics is one thing and managing the busyness is another. You should include in your question what kind of help you need.
815692
TIME, TIDE AND CONCRETE WAITS FOR NO MAN.\nIt is poured insmall slabs because :-\n1.  it is easier to handle and maintain levels\n2. it will expand and contract more uniformly and lessen the chance of cracking occurring\n3. in large areas it enables falls of levels to be made in different directions for drainage  lines.\n4. in doing a big pour you have to ensure that you don't have to wait too long between loads as the first load could go off before you put down the last one.