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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
Can you pour concrete to steel bars painted with red oxide primer?
yes we can pour concrete to steel bars painted with red oxide. this will help steel bars from getting corroded.
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 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.
Can you pour a concrete slab onto another concrete slab?
No. Concrete won't bond to concrete. It will end up 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 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.
Can you get a handprint off concrete?
pour more concrete over the top and smooth it out
How do you produce concrete blocks?
You pour liquid concrete into a frame and let it set.
How does creep and shrinkage affect concrete?
Concrete naturally shrinks as it cures. If the pour is large enough, cracks WILL occur. Structural designers introduce so-called "control joints" in large pours so that cracking either does not occur, or occurs in predictable areas. If you look at a typical concrete driveway for instance, you will notice lines scored across the concrete every few feet. Any stress cracks that occur are more likely to happen in the joint, where they will be less noticeable. This can be a huge problem in certain structures such as dams or the containment building at a nuclear power plant. Concrete for these types of structures has to be carefully engineered and layed. Concrete gives off heat as it cures (an 'exothermic' chemical reaction) and this can make the problem much worse. It is common to mix the concrete for a dam with chilled water and pour it in many thin layers to minimize creep and shrinkage caused cracks and flaws.
Do you need a license to pour concrete?
Yes
Can we have an alternative method or system to concrete pour cards?
pour card poor or fare
Can you pour concrete over asphalt?
Yes, but you will need to reinforce with a wire mesh and then pour.
