Views : 2,098,640
Genre: Education
Date of upload: Aug 24, 2023 ^^
Rating : 4.852 (548/14,232 LTDR)
RYD date created : 2024-05-21T03:38:22.592412Z
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Top Comments of this video!! :3
Very good brief explanation accept one. The finishing process is performed at the time the concrete is curing and not after. Usually 3 to 4 hours after being poured, skreed, floated and or fresno smoothed, a trowel, broom or stamp finish is applied. The only finish performed after curing is acid etching, grinding and polishing. 70% strength it usually obtained after 7 days. 90% after 28 days. Concrete can cure for up to 90 years. The Hoover Dam project was still creating heat from curing years after completion.
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I run a concrete plant. There are a few batches (recipes) we use all the time for things like driveways, sidewalks, foundations etc but for special projects (large commercial jobs etc) there are hundreds to choose from and my company has experts that can whip up a new one whenever needed. There's also a lot more than just retarder. There's water reducer which also increases the strength of the concrete, fiber (steel, plastic and glass varieties), and we can even change the color of the concrete.
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@abcdef-qk6jf
8 months ago
I used to work at a cement factory. The video is factual correct without getting into too many details. Modern grey cement production uses a tower with a calcinator and a cyclone - the cyclone removes a lot of water very quickly. You need less heat to remove the water. The production is sped up multiple times making it far more energy efficient than the rotary kiln. Cement production uses a lot of waste products like the ash mentioned. Waste has become a ressource - you pay for.... Cement production releases a lot of CO2 - however a lot gets trapped again in the process of curing (when the cement hardens).
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