the construction and design of concrete slabs on grade,concrete slabs on grade are a very common type of concrete construction. joint design and performance, and the slab thickness. floor classifications table 1 describes the nine classes of concrete floors according to aci 302, a modulus of sub-grade reaction of 400 to 500 psi/inch can be.how much weight can 4 inch concrete slab hold?,i want to construct 4 inch thick and 9 foot tall wall above the slab that is 4 inch thick to extend my room. composition of concrete used in slab: 1:2:3 ratio of opc-cement:sand:crushed-stone. reinforced by 8 mm rebar. length: 17 foot width: 2 foot i want to know if it can hold the wall with 6 by 5 and 4 by 5 foot two wooden windows..
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if the concrete slab thickness is greater than 5 inches, it is a good idea to use rebar or at least wire reinforcement mesh. it is required in some building codes. before pouring a slab thicker than five inches, consult your state and local building codes!
recommended thickness of concrete slabs. sponsored links. driveways : 6 - 8 inches ( 0.15 - 0.2 m) side walks, barn and granny floors : 5 - 6 inches (0.125 - 0.15 m) porches, home garage floors : 4 - 5 inches (0.1 - 0.125 m) farm building floors, home basement floors : 4 inches (0.1 m) sponsored links. miscellaneous - engineering related topics
concrete slabs calculator. input length, width and depth of the area. click the button to calculate the volume of concrete and man-hours (not including mixing) needed for this job. this calculator is to be used as an estimating tool only.
commonly, concrete slabs are between 4 and 20 inches thick and are used for a purpose of floor and ceiling construction. thinner slabs can be used for exterior paving. before any pour you need to know how much concrete will be needed. please use the calculator below to give you some estimate of the concrete amount.
the international residential code (irc) 2012 which applies in my area states that: concrete slab-on-ground floors shall [...] be a minimum 3.5 inches thick. i've found that most slabs are 3' to 4' thick, excluding the footings.
for flatwork, such as slabs-on-grade and driveways, a minimum thickness of four inches is required, but increasing the thickness to five inches can add nearly 50 percent to the load-bearing capacity. thickening the structure along the perimeter by another will serve as an integral footing, adding strength where the loads are heaviest.
standard concrete floor slab thickness in residential construction is 4 inches. five to six inches is recommended if the concrete will receive occasional
for the home owner or handyman usually 5, 1/2 to is just fine for project a round the house. now to answer the question the compression strength for is around 2500 psi to 3000 psi then for it jumps to around 4000 to 4500 and so on all on a 4 in slab.
the average cost to install a concrete slab is $6 – $20 per square foot. besides the cost of concrete and materials, there are also labor costs for preparing the area, the pour, and finishing. a standard brush finish will likely be on the low end of the price range, while a decorative finish with coloring will be on the high end of the range.
r-value calculation for concrete slab . a reasonable r-value for a normal concrete slab can be estimated using an r-value, the thermal resistance per inch of thickness, between 0.1 and 0.2 and multiplying it times the slab thickness. however, the following expression can be used to compute r, this equation is provided by astm c 168:
if you have a 4 inch slab and multiply it by 24 to 32 you will find that your joints should be placed every 96 to 144 inches or 8 to 12 feet; if you have a 5 inch slab and multiply it by 24 to 32 you will find that your joints should be placed every 120 to 180 inches or 10 to 15 feet; or another way to figure this out is to times it by 2 or 3
thickness of concrete slab depends on loads and size of the slab. in general, 4-6 inch (100mm-150mm) slab thickness is considered for residential and commercial buildings with reinforcement details as per design. methods used for finding slab thickness varies for different types of slabs.
the cracked, thin concrete should be removed, the sub-base properly compacted (hopefully you have gravel under there) and a new 4' thick concrete floor poured. install concrete expansion joint material around the perimeter before pouring and saw concrete contraction joints in the floor the same day (hire someone who has a soff-cut saw).
if you enter your first two measurements, (for example, 5 metres x 3 metres) and your depth is 6 inches or 150mm, you would enter this as 5m x 4m x 0.150 = 2.3 cubic metres. if you have any questions regarding your concrete mix requirements, please call our customer support team, who will be happy to help you.
the thickness of conventional slab is 4″ or 10cm. 5″ to 6″ inches is recommended if the concrete will receive occasional heavy loads, such as motor homes or garbage trucks. conventional concrete slabs are square in shape and have a length of 4m.
the load-carrying capacity of a floor varies as the square of the floor thickness. you can estimate the expected change in floor load-carrying capacity due to reducing the thickness from 6 inches to 5.62 inches instead of 6 inches as follows: (5.62/6) squared = 0.88
place concrete at a minimum thickness of 4 inches. increasing the thickness from 4 inches to 5 inches will add approximately 20% to your concrete cost, but will also boost your driveway's load-carrying capacity nearly 50% , according to the tennessee concrete association.
the figure shows that the stre containing ngth of concrete siliceous aggregate begins to drop off at about 800 °f and is reduced to about 55% at 1200of. concrete containing lightweight aggregates and carbonate aggregates retain most of their compressive strength up to about 1200 of. lightweight concrete has insulating properties, and
now, he’s nearly read to place a new 5-inch-thick slab that will include tubing for radiant heat. budesheim’s architect has supplied a drawing for the concrete slab and its base layers, and the details are making budesheim nervous.
moreover, the thicker the concrete slabs are the stronger the driveway is going to be. in fact, ascending the thickness to 5 inches would elevate the load capacity of the pavement by around 50%. in short, paving extra for additional concrete worth the maximized durability.
square or rectangular concrete slab. the volume formula for a rectangular (or square) slab in cubic feet is height(ft) x width(ft) x length(ft), as seen in the figure below: for example, 1ft x 3ft x 6ft = 24ft 3 (cubic feet) of concrete required. the simples use of our tool is as a concrete slab calculator or concrete
explanation: installing a concrete driveway should be 4 to 5 inches thick and all edges should be turned down at 6 to 7 inches thick all the way around the drivrway
concrete floor slabs on grade are subjected to a variety of loads and loading conditions. the design procedure includes determining slab thickness based on moving live loads and then checking adequacy of slab thickness for stationary live load. the design procedure separately includes determining thickness of slab under wall load.
as far as the op's engineers advice i think he is way off as well. 40# per sq foot for a 3 inch thick reinforced concrete slab with corrugated steel underlayment on 24' spaced structural members seems way low. to be honest my books say the 3' thick slab weighs around 35# per sq foot alone.