about 5 yards if your slab is 4" deep
This depends on the slab thickness required in your area. A six-inch slab would give this calculation: 13.3 yd x 20 yd x 1/6 yd = about 45 cubic yards. Single story residences on stable compacted ground are allowed to be as thin as 4 inches in many areas, which would require only 30 cubic yards.
Engineers will consider the forces involved on the concrete slab and come up with a figure of -ve and +ve rebar needed to resist the moments. They will also consider the strength of concrete required, 20mpa, 32 mpa etc. Sometimes temperature steel is also added. They will usually come up with a figure like 575mm/m2 of rebar needed in the +ve and another figure for the -ve. Then the designer steps in, looks up their rebar tables and works out that to cover 575mm/m2 they can use 4-N20-LL-320 or something. Which stands for 4 size n20 (20 dia) bars, LL shape, so a 90 bend on both ends, at 320 spacing.
The maximum span of a waffle floor slab typically ranges from 20 to 30 feet (6 to 9 meters), depending on various factors such as the slab thickness, the spacing of the supporting beams, and the load requirements. For larger spans, additional reinforcement and design considerations may be necessary. It's essential to consult with structural engineers to ensure safety and compliance with building codes.
There are too many variables that are not quantified in the question to answer this. What kind of concrete? (There are different kinds.) Is the concrete reinforced? How is the square of concrete supported? What is the nature of the load and how is it distributed on the slab? We could go on.
The weight of 5 rebar rods can vary depending on the diameter and length of the rebar. As a general estimate, a standard size #5 rebar (5/8-inch diameter) that is 20 feet long weighs around 15.41 pounds. Therefore, the weight of 5 such rebar rods would be approximately 77.05 pounds.
For a standard 4-inch thick slab, this area needs at least 3.95 cubic yards.
20
between 4 and 6$ per stick.
2x2
If your peice of concrete does not have beams I consider that flatwork. So in flatwork with 3/8 rebar (#3) on 16" centers, for the 15 foot side you will have 8 pieces x 15' long. On the 10' side you will need 12 pieces x 10'. (6 bars cut in half) In all you will need 14 #3 x 20'
i just found it online #5 rebar 20' lenght bundle of 100 for $1295. or $13.00 ea.
Apple no longer produces a 20 inch iMac. You would have to buy a used one to get a 20 inch model.
about 5 yards if your slab is 4" deep
You have to find a chart that will indicate the weight per unit of measure for the appropriate rebar size. Than take that and multiply it by the the length of the rebar. For example, a #4 rebar weighs 0.668 lbs/ft. If you have 5 @ 20-00 pieces that is 0.668 X 20 X 5 = 67 lbs. Charts are available throughout the web or at CRSI.org.
How much amperage for a hotpoint 20 inch stove
You need the size of the rebar involved to calculate the weight. Charts can be found at CRSI.org or Rebarapps.com. Than take that and multiply it by the the length of the rebar. For example, a #4 rebar weighs 0.668 lbs/ft. If you have 5 @ 20-00 pieces that is 0.668 X 20 X 5 = 67 lbs. You need to know the size of the bar to calculate.