Estimating Rebar In Concrete

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Estimating rebar in concrete.

Reinforcement bar rebar functions. Average values for typical concrete frames. Put those together and your total order is 1 140 feet of rebar. There are many variables to consider such as surface prep formwork reinforcing materials and finish work plus the cost of the ready mix concrete that will add up to the total price of the job.

The rebar calculatorcontains equations and data used in working with reinforcement bars rebar in concrete slabs. Reinforcement estimation thumb rule method this simplest method is based on the type of structure and the volume of the reinforced concrete elements. Lb per ft 100 lb 18 4 00 13 600 2 00 14 2 25 7 650 2 00 11 1 56 5 313 1 00. First work out your slab area.

The formulas calculate materials needed for rectangular circular and irregular shaped slabs. Multiply that by your 1 140 feet and you ll find you need to order 1 189 pounds of rebar. Estimating reinforcing bars how the bid price is determined by william c. Three methods of varying accuracy are.

It has been said many times that an estimator s quantity survey may determine 1 whether the rebar fabricator is successful in securing a certain contract and 2 whether it turns out to be a profitable contract or not. Heavy industrial 130 kg m 3. Add in walls and columns. If you re using 5 bars for example they come in at just over a pound per foot 1 043 to be precise.

Rebar is often installed in a grid pattern and to estimate the amount needed it will be important to first identify the size and spacing is appropriate for your project. Work out the steel per m2. Estimating the cost of new concrete involves much more than the price of concrete per yard or meter. Black chief engineer reinforcing bars piling and construction specialty sales bethlehem steel corporation fabricated deformed concrete reinforcing bars size extras area weight extra per bar size sq.

Rebar estimating is a skill that requires experience. One of the steps in pricing concrete is to estimate how much rebar is needed for the project. Now look up the weight of your rebar. Say 15m x 20m for simplicity as an example.

Multiply the steel per m2 x your slab area. For a patio it is common to use a 3 bar spaced every 18 24 while for a driveway 4 bar is often used with a 12 18 spacing. In other words the rebar estimator is a very important cog in the reinforced concrete construction wheel. At whitacre engineering we give our clients fast accurate quotes.