Infrastructure Projects - Construction Technology
A Practical Guide to Construction Techniques and Practice
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I wanted to show you some of the techniques for striking off the concrete. In earlier slides, we saw a very crude approach, seemed to be very little control. This is a more typical procedure, and it exercises some controlled. It still looks rather primitive, but the results seem to be satisfactory. I've lived in several high-rise buildings and the floor looks very flat. You could exercise much more care. You could put down pipes screeds that would precisely control the elevation and the flatness of the concrete. That's obviously not being done here. They seem to get a satisfactory result, and you will at least see a somewhat more organized and controlled procedure in this video.
The space behind this column, the deck has already been poured. I'm sure that's when they discovered that they missed one column. To their credit, they could have just taken that floor concrete and put it in the column. As I say "to their credit," they did not do that. The column probably has a different mix and so they brought in some of the column mix. With a crane and bucket, they've gone back to concrete this column that they overlooked. |
![]() Behind that screed a mason is using a bull float to even off the top surface. That's how they control this process. As I say, it looks rather primitive, and it is, but it achieves the correct result. The concrete was being placed by a pump, I think, up until now, we watched the concrete being placed with the crane and bucket, but at this point it's being pumped. Even though this is a very cold day, I guess an hour or two behind the fresh concrete, the mason is able to trowel it. Now he cannot control the grade. He's just polishing the top surface. That screeding process has to put the concrete down where it belongs. This is just a finishing technique.
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