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Use a ready-mix concrete design as follows: Concrete Compressive Strength (f'c) = 5,000 psi minimum @ 28 days, cement content (dry weight) = 650#/C.Y. minimum, but you can substitute up to 15% of the Portland Cement weight with Fly Ash Type F or G (Pozzolans).....this will cut the cost of the concrete and give you an early high strength ...
5,000# mix could produce a thinner slab. Use less concrete. 3,500# mix should be easier to finish, if that is a factor. Whatever you do, cure it well. Remember This: Concrete wants to be as dry as possible until it's set and as wet as possible until it's cured. Do that and you'll get good concrete. Also, watch your cover on bars near the form.
More cement adds to the strength. Use as little water as possible. When products are used the concrete will fall in place easily without vibrating. You'd better make water tight concrete when you want to use a mesh or mesh with a good coating to not let it rust and crack up the concrete after time. Rusting steel can expand about up to a factor 7.
Hi, I am located in north central Missouri and am preparing to pour a 30'x40' concrete slab 5'' thick for a work shop. I am considering using galvanized welded wire cattle panels rather than 1/2'' rebar or woven wire mesh but have heard talk that the galvanizing on the cattle panel's doesn't bond well to the concrete.
Also, concrete compressive strength may not have been up to spec or may have deteriorated over time. The SE will direct the agency to perform either concrete core sampling at designated locations so as to perform concrete compressive tests in the lab to determine the average concrete compressive strength, or he/she may elect to employ several ...
Coconut fiber reinforced concrete (CFRC) may also strengthen members of the building and construction industry who want to "go green" without breaking the bottom line. What about coconut fibers and bioplastics? Unlike traditional plastics, which are made from petroleum and fossil fuels, bio-based materials have a smaller carbon footprint.
Mesh would not be a good idea for concrete support for under the FP, but you couldd use it elsewhere. You should not be at 21000 lbs under the fireplace... But if those numbers are correct, make the minimum 3000 psi fiber reinforced pad under the FP 12" thick with 5/8 rebar 16 OC, and the footer while under the FP at least 16" x 16"..
Replacing driveway in Colorado (just east of Denver) and trying to calculate concrete, steel fiber, mesh, and/or rebar strong enough to support 60,000lb garbage trucks. I am just a homeowner and not an engineer. I find the potential of steel fiber reinforcement intriguing but it also just adds yet more variables.
You need the grade of concrete if you must throw it into a formula. Best bet is to get the weight of a yard of the particular type of concrete (fiber impregnated, slump, etc), break it down to weight per cubic foot. Get the cubic feet of the pipe... thickness of the pipe is important since this will determine the actual mass of concrete.
Carbon-fiber-reinfor ced polymer or carbon-fiber-reinfor ced plastic (CFRP or CRP), is a very strong and light fiber-reinforced polymer which contains carbon fibers. The polymer is most often epoxy, but other polymers, such as polyester, vinyl ester or nylon, are sometimes used.