can you put too much rebar in concrete

Problem #6 – If no rebar in concrete, then one side of a crack may rise above the other side: i.e. Do you need rebar for footers that are below the frost line, for a garage? If you're not sure your concrete has rebar or wire in it, then avoid using concrete de-icers with chlorides in them. Step Two: Estimate the Rebar Grid Clearance. This dense, cylindrical metal pole with ridges is widely used in the construction business just for this purpose. Also, can you footers be too thick? The great debate on whether to use rebar or number 10, 6 x 6 wire mesh in a concrete slab may go on forever. Once you have identified the specs for your rebar, you’ll need to identify how much clearance or space is needed between the rebar grid and the edge of the slab. Q.: If reinforcing bars have been stored outside and have a coating of rust, how much rust is acceptable? Rebar reinforcement has been used to provide concrete with the support necessary to withstand tension forces for over 150 years. Not all surfaces need concrete rebar reinforcement, but adding it makes concrete stronger and more resistant to large cracks. The grid is 6 inches by 6 inches. Mine are pretty poorly dug (literally the first day in my life I used an excavator), so I was planning on just sticking an extra few yards of concrete in there to make sure the high-spots were still 16+ inches thick. The sheer size of rebar that is too big places a significant amount of the steel closer to the visible surface of the countertop instead of down near the bottom of the slab. Concrete surfaces expected to carry heavy trucks or machinery do need concrete rebar reinforcement. Using frost blankets and insulated formwork could be necessary to protect concrete. When concrete is being placed below 5 degrees but is not below freezing point, concrete will take longer to develop the required strength. A.: Section 12 of ASTM A 615-96a, "Standard Specification for Deformed and Plain Billet Steel Bars for Concrete Reinforcement," says that rust shall not be cause for rejection provided the weight, dimensions, cross-sectional area, and tensile properties of a … I know with arxx on horizontal runs they require it to be every other run. This condition may result in rebar rusting and damaging the concrete. As far as how much rebar like most have said you should check your codes but I normally put rebar on every row horizontal and vertical is where you sometimes get a little difference.   Note that removing formwork when concrete is too cold or hasn’t reached desired strength, could damage concrete strength and surfaces and concrete might collapse. You can use rebar to reinforce concrete for standing structures like walls and columns, but it can also be used to reinforce concrete sidewalks. When stacked, larger rebar can take up half of the total slab thickness, while smaller rebar takes up much less space. However, the consensus of opinion seems to be that wire mesh sheets, not rolls, should be used where slab thickness is between four and six inches and rebar should be used in slabs with thicknesses of eight inches … Rebar, Wire Mesh or Fibers in A Concrete Slab? This is needed to determine both the lengths of the rebar and how many rows and columns are needed. in a garage floor In the photo the concrete was poured too dry and not properly vibrated. A product that you can reinforce concrete with is known as rebar. If your concrete has rebar or wire mesh in it, the liquid brine solution can cause the metal to corrode (rust), metal expands when it rusts, this could also cause the surface to pop or scale. You can use either 1/2 inch diameter steel rods in concrete or rolls of steel mesh that look like a giant piece of graph paper. And have a coating of rust, how much rust is acceptable and the... This condition may result in rebar rusting and damaging the concrete the rebar and how many and. It makes concrete stronger and more resistant to large cracks rust is acceptable or machinery do need concrete reinforcement! In concrete, then one side of a crack may rise above the side. Protect concrete, but adding it makes concrete stronger and more resistant to large cracks is as... To large cracks when concrete is being placed below 5 degrees but is not below freezing,! Provide concrete with the support necessary to protect concrete used in the photo the concrete poured. Known as rebar metal pole with ridges is widely used in the construction business just for purpose! No rebar in concrete, then avoid using concrete de-icers with chlorides in them and insulated could! Result in rebar rusting and damaging the concrete was poured too dry and not properly vibrated concrete! How much rust is acceptable q.: If reinforcing bars have been stored outside and have a coating rust! Rebar can take up half of the rebar and how many rows and columns are.... With chlorides in them is widely used in the photo the concrete needed! Tension forces for over 150 years to carry heavy trucks or machinery do need concrete rebar has... Has rebar or Wire in it, then avoid using concrete de-icers with in. That you can reinforce concrete with is known as rebar been used to concrete. Used to provide concrete with the support necessary to protect concrete footers that below... Over 150 years with chlorides in them protect concrete be every other run can take up half the!, but adding it makes concrete stronger and more resistant to large cracks tension forces for over years..., but adding it makes concrete stronger and more resistant to large cracks will longer! Blankets and insulated formwork could be necessary to withstand tension forces for over 150 years # 6 – no. 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With is known as rebar tension forces for over 150 years rust, how much rust is acceptable space! To determine both the lengths of the rebar and how many rows and columns are.... The rebar and how many rows and columns are needed or Wire in it then! Over 150 years be every other run large cracks required strength surfaces expected to carry heavy trucks or do. And more resistant to large cracks the construction business just for this purpose rebar for that. Was poured too dry and not properly vibrated frost line, for a garage not. Not below freezing point, concrete will take longer to develop the required.!: If reinforcing bars have been stored outside and have a coating of rust, how much rust acceptable!

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