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Cracking at expansion joints is always acceptable and is the reason for the joint itself. There are two kinds of cracks, pretty ones and ugly ones! Ugly ones are random cracks where the concrete relieves itself from drying shrinkage in a random location within the slab of concrete which is normally not appealing to the eye. Expansion joints are placed at predetermined intervals within the slab where random cracks are weakened planes in locations where cracking is predicted prior to fresh concrete placement. All concrete shrinks when it dries, the larger the slab, the greater the overall shrinkage. When the tensile strength of drying shrinkage exceeds the tensile strength of the concrete, cracking will occur. Lets just hopes it cracks in a spot where we planned it instead of a location where didn't. By the way, joints should be cut at least 25% of the depth of the slab.

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How do you cover brick with concrete?

POUR THE CONCRETE OVER THE BRICK


What is pour card in civil engineering?

In larger concrete projects with a good quality control program, a pour card is a document that describes the location of the concrete being poured, type/specification of concrete being supplied, a signature block by the inspector and/or engineer indicating that the rebar has been inspected in-place and approved, date of pour, serial number of the concrete truck(s) supplying the concrete, sign-off by the inspector indicating on-site tests for slump and air entrainment (if required) have been completed. Temperature, weather and ticket info from the concrete batch plant/delivery truck are also recorded. The contractor's quality assurance manager will typically keep all the pour cards for a project on file, especially in the even that subsequent testing indicates substandard concrete was installed.


Can you pour concrete to steel bars painted with red oxide primer?

No, it is not recommended to pour concrete directly onto steel bars painted with red oxide primer. The primer may prevent proper adhesion between the concrete and the steel, leading to a weaker bond and potential structural issues. It is important to remove any paint or primer from the steel bars before pouring concrete to ensure a strong and durable connection between the two materials.


Can concrete set under water?

Yes. Water is actually needed for concrete to set and is vital to the curing process. Concrete will set just fine under water. Depending on your specific application (will all of the pour be under water or will it start under water and finish above the water line) you may need to adjust the initial dryness of the mix as well as take more care in the pour. All of the volume of the concrete that is under water shoudl be poured in continuous fashtion. If you must pour in steps, the start of the next pour must be "in" the old pour so as to not leave a water survice between the pours. This "seam" will tend to stay and produce a weaker stucture.


How much should it cost to pour a concrete sidewalk Memphis TN?

In Memphis, TN the cost of having a professional contractor pour concrete on a driveway averages from $5 to $9 per square foot. The addition of a sealant to preserve a driveway can cost as much as $18 per square foot in Memphis, TN.

Related Questions

Can you pour a concrete slab onto another concrete slab?

No. Concrete won't bond to concrete. It will end up cracking.


Is it possible to pour concrete in the rain?

Yes, it is possible to pour concrete in the rain, but it is not ideal. Rain can affect the quality of the concrete and may lead to issues such as weakened strength and cracking. It is recommended to avoid pouring concrete in the rain if possible.


How thick can you pour concrete when drying?

The thickness of concrete that can be poured when drying typically ranges from 4 to 12 inches. Thicker pours may require additional support or reinforcement to prevent cracking.


How soon can concrete be sealed?

You should wait a minimum of 28 days before you seal concrete. If you pour your concrete in summer, than a minimum of 14 days is acceptable. If you seal concrete any quicker, there is a chance moisture will be trapped inside.


How to pour a concrete slab effectively and efficiently?

To pour a concrete slab effectively and efficiently, start by preparing the site by leveling the ground and setting up formwork. Next, mix the concrete according to the instructions and pour it into the formwork. Use a screed board to level the concrete and a bull float to smooth the surface. Finish by adding control joints and curing the slab properly by keeping it moist for several days.


Why should you give construction joint in slab?

Construction joints in slabs are essential for accommodating movement and controlling cracking due to temperature changes, shrinkage, and settling. They help ensure that the concrete can expand and contract without causing damage to the structure. Additionally, these joints provide a clear stop for each pour, allowing for better workability and a more uniform finish. Properly placed construction joints also facilitate maintenance and repair in the future.


How thick can you pour self-leveling concrete for optimal results?

For optimal results, self-leveling concrete should be poured at a thickness of 1/4 inch to 2 inches. Thicker pours may lead to cracking or uneven drying.


How much does it cost to pour a concrete driveway?

how much does it cost to form and pour concrete in Mobile, AL


How much to pour a concrete slab 12x24?

about how much to pour a concrete slaba 12 x 14'


How do you cover brick with concrete?

POUR THE CONCRETE OVER THE BRICK


How to prepare the ground to pour a concrete curb?

There are a number of ways in which you could prepare the ground to pour a concrete curb. You could level the surface and pour sand.


How to pour a concrete pad correctly?

To pour a concrete pad correctly, first, prepare the site by leveling the ground and creating a form to contain the concrete. Next, mix the concrete according to the instructions and pour it into the form. Use a screed to level the concrete and a float to smooth the surface. Allow the concrete to cure for the recommended time before removing the form.