Make Shortcut to Home Screen? Driveways : 6 - 8 inches 0. Privacy We don't collect information from our users. Citation This page can be cited as Engineering ToolBox, Most commercial sidewalks are poured around 4 to 6 inches and are not as thick as their load-bearing concrete cousins. How Thick is a Commercial Concrete Slab? What is Commercial Concrete?
Commercial Concrete Reinforcement. Consulting with a Concrete Professional. Related Posts. Concrete Curb and Gutter Replacement. May 5th, 0 Comments. Life Cycle of Asphalt and Concrete. April 18th, 0 Comments. How to Cut Concrete and Asphalt. EPS, usually white, is popularly used underneath slabs and below-grade because it has a low moisture absorption rate.
Also, it is strong, stable, and has excellent thermal insulation properties. It is a good option if you live in areas that face frost problems.
XPS is widely available in the form of board stock and has been in use for decades. However, it tends to absorb moisture at higher levels and, thus, works better in dry areas. Concrete is a porous material, which means it has void spaces through which water particles can pass through. So, concrete slabs usually need a vapor barrier that could be any material that you can use to prevent moisture from getting into the slab.
And it is generally placed underneath the slab before you build or pour concrete. Over time, the moisture will get through the slab onto the surface and the space in which the slab is, thus causing water damage over time. As a result, you may end up with issues such as mold and mildew. Black polythene is a typical waterproofing material that you can use underneath the concrete slab. The thicker it is, the more durable it will be.
So, consider getting a material that is 10 millimeters or thicker. However, if the concrete slab is thicker and will experience a lot of pressure from heavy equipment and machinery, it would be better to use a vapor barrier material that is 15 millimeters or thicker. The general rule of thumb is that a slab takes approximately 30 days to dry for every one inch of thickness if other conditions are right.
So, a 4-inch slab will take days on average, while a 6-inch slab covering a similar area will take days to dry. Concrete for slabs is usually poured in one day. For that reason, you need to have enough to complete the slab.
Below are the steps you can take to estimate the amount of concrete you need for the slab only without the footings. When calculating how much concrete you need, it is better to err on the side of caution by getting more.
You can always find some use for it rather than falling short and ending up with a thinner slab than the recommendations state. Concrete slabs tend to expand and contract. As a result, they can cause other sections adjoining them to experience a lot of stress. And that is where expansion joints come in. Expansion joints are cuts within the concrete slab that are made when it is wet. They are meant to allow movements within the concrete when it expands or shrinks thus, preventing future cracks.
And you can cut these joints one to three inches deep. How thick a concrete slab is will determine how far apart the expansion joints are cut. Typically, the spacing between the expansion joints measured by foot should not exceed two or three times the thickness of the concrete slab. For example, if your concrete slab is four inches thick, the expansion joints can be 8 to 12 feet apart. However, you can extend the spacing between expansion joints until it is 24 to 36 times the slab thickness.
But the limit is 15 feet apart. For this criterion the fire rating of a floor is the number of hours necessary for the temperature of the unexposed surface to rise by a given amount, generally For a Lastly, slab thicknesses are usually rounded off to the nearest 10mm.
Similar to the one-way slab, the thickness of two-way slab should satisfy deflection and shear requirements. Generally, the slab thickness is chosen to prevent excessive deflection in service. The ACI Code provides method to compute minimum two-way slab thickness which satisfies deflection. This method is applicable for different types of two-way slabs such as flat slab, flat plate, slabs on beams, slabs without interior beams.
To see the details of computing minimum slab thickness, please click here. The slab thickness chosen must be adequate for shear at both interior and exterior columns. The ACI Code permits thinner slabs to be used if calculated deflection is within the specified deflection limitations.
If the slab's shear strength is less than ultimate shear imposed on the slab, then required strategies shall be considered to tackle the problem. These strategies include:. Join Join TheConstructor to ask questions, answer questions, write articles, and connect with other people.
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