From the course: Construction Management: Concrete Construction

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Layout and stressing

Layout and stressing

From the course: Construction Management: Concrete Construction

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Layout and stressing

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- [Instructor] If you followed this discussion so far on pre-stressing concrete, it may have occurred to you that the placement of this reinforcing can have a big effect on what it does to the concrete structure. You may have also wondered just how much force we're using to squeeze this concrete together, so let's take a look. Let's talk about the force first. Pre-stressing steel is very high-strength steel. Typically we use what we call Grade 270 pre-stressing steel, which means it has a breaking strength of 270,000 pounds per square inch. Just for a reference point, typical rebar reinforcing is Grade 60. When I install this pre-stressing steel, I'm gonna tension it, remember, by anchoring at one end, and using a hydraulic jack to pull on the other end. Now all of this is a somewhat complicated procedure, it could probably take up its own course, but for our purposes here, I want you to understand just how much force we're using to pull on that cable. Using that hydraulic jack, we…

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