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How many hours to start concrete curing after casting of concrete?
Wiki User
∙ 9y ago
It starts curing the second they put water in it.
Wiki User
∙ 9y ago
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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.
When does hydration in concrete start?
As soon as the Cement comes into contact with water. This will start as soon as the cement and aggregates come into contact unless the aggregates have been dried of all surface water.
What is an under reinforced beam?
Under reinforced is that in which provided steel ratio is less than balanced steel ratio. Concrete beams are designed as under reinforced beams. The reason is that the failure start by yielding of steel instead of crushing of concrete. Mian Yaqoob
Does Shotcrete crack?
Yes it will crack. I think any and all concrete will crack. Maybe not enough to leak water but hairline cracks. Coat your pool with good waterproof sealant if leaks start.
How long does concrete last?
It depends on the design life [50 -75 years?], the environmental & service conditions, and preventative maintenance practices. Concrete is thought of as being permanent strong and very durable. In actuality it is a very complex, thermodynamically unstable and chemically reactive building material that continues to cure and become stronger for years. It is also vulnerable to many external influences! To obtain maximum life cycle [make it last] there are dozens of protective measures that can be taken to make it Green. An understanding that concretes absorb water and expel internal chemistry for years is paramount to obtaining a long life. That drop of water you put on the surface was absorbed into the interior through the Gel-Pore / Capillary System, present in all concretes. This path is formed when water in the mix comes to the surface during the initial set/curing phase [Bleed Water]. After curing, it's hard, we walk and drive on it, but water we put on the surface is absorbed back into it. This moisture carries contaminates: salts, acidic compounds and carbon dioxide to the interior. Lowering the High pH around steel reinforcement to a point that corrosion cells begin to form on the embedded steel in the matrix. Internal chemistry allowed to migrate out to the atmosphere on the surface results in several deleterious conditions. ASR, efflorescence, ettringite are a few! This is also what blisters or "Burns" a coating off in a very short time. A paint designed to protect the concrete, doesn't stand a chance if alkali is coming to the surface to compromise the bond! First step in obtaining a long lasting concrete is to Stabilize It by waterproofing, to fill the microscopic voids in the capillary system. Nothing going in and nothing coming out of it is a Great Start. In reducing Moisture and Oxygen content inside a concrete, you have eliminated two of the four conditions needed for corrosion to commence. A stabilized concrete will give longevity to this very volatile building material, make it Green and prolong it's service life substantially. Answer is: " It Depends On How You Treat It!"
When do they start casting for the hunger games movie?
April 2011
What are concrete nouns that start with x?
Concrete nouns that start with X are:xylophonex-ray machinex-ray fishXerox copy
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.
Can you install a real wood floor on top of a concrete floor?
You can. You start by applying moisture barrier to the concrete--flooring stores have it--then gluing the hardwood to the concrete.
When did they start casting twilight the movie?
In August 2008. It didn't take them very long.
What is the intial setting time for cement?
The initial setting time of cement is 30 minutesThe final setting time of the cement is 10 hours.The initial and final setting time of the cement can be found by using the Vicat's apparatus.
Who will be playing Iggy in the Maximum Ride movie?
Actually, the casting director for the maximum ride movie hasn't been chosen yet. So until the producer finds a casting director, the auditions have not been placed. I think they may start casting people by next year.
What is the effect of hydration on strength of a concrete?
Excess water (over hydration) causes weak concrete. The water in concrete is there to start a chemical process which results in the hardening process. The excess water is not used in the chemical process and results in a weakened concrete.
When does Americas top model cycle 13 casting calls start?
Wednesday, February 25th in Rochester, Minnesota
What is reinforced concrete used for?
Actually concrete is not very good in tension therefore we have to introduce reinforcement which takes care of the tensile stresses. If we don't provide reinforcement, concrete will start showing cracks wherever tensile stresses overcome the concrete tensile strength.
Will a heat gun remove paint from concrete step?
It does depend on what kind of paint and how deep it has set in the concrete, but it certainly sounds like a good start to work on.
How have technological developments affected the concrete industry?
Since the start of the 1980s, concrete formulations changed to create an entirely new generation of high-strength products
