Process of Making High Strength Concrete Piles. Korean PHC Pile Factory

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Published Jun 17, 2022

Process of Making High strength Concrete Piles. Korean PHC Pile Factory

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com:The plate and the bolts into the endplate at about the 2: 20 mark serve dual purpose. It helps hold the rebar steel pattern in place, and it looks like it pulls it into tension. The "P" in PHC stands for pre-tensioned, which is where you pull the steel before casting the concrete around it, and it essentially makes the concrete "tighter". This has to do with the relative strength differences concrete has when it is pulled vs. when it is pressed.

The oil is formally called a "form release agent", which really does the same thing oil in a cake pan does.

Steam is used to cure this concrete, I'm going to guess because it is hot and wet. Concrete needs a lot of water to cure (harden), and a high-strength concrete has a lot of cement, and therefore needs a lot of water. This is a chemical reaction, so if you write it out, there's no water in the end result. Keeping it hot and saturated speeds up the reaction by giving it plenty of reaction material and energy.

I'm shocked they're hollow in the middle, which was a surprise after they spun the cylinder. I normally don't work with PHC piles, and spinning concrete is usually not recommended because you can separate the components and end up with uneven distribution. It's quite a fast speed, so I'm guessing the aggregate mix has to be very uniform to avoid this problem.

Thank you for posting, this has been very interesting to me.