The Republic - Austin, TX - November 15, 2022 - NORTH

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Pictured Right: Notice the props and forms highlighted?

This image was taken at 7:16:02AM on a Tuesday.

Pictured Right: By the end of the day at 5:16:37 the props and forms are unmoved.

Pictured Right: 5:16:37PM timestamp.

What this shows is how direct observation can track progress with the exacting detail to accurately measure the timeline of progress. 

Casual photography and timelapse videos lack such detail. 

A large delivery of post-tension (PT) cables indicates major floor work and concrete pouring is about to take place. 

While rebar provides an average of 60,000lbs psi of strength, PT cable deliver a whopping average of 270,000 psi.

Source: https://www.gp-radar.com/article/how-post-tensioned-cables-are-anchored-in-concrete-slabs

Pictured Right: On an unrelated construction site, tendons have been places in combination with steel rebar.

Source: https://www.suncoast-pt.com/services

Pictured Right: A lot of preparation and attention to detail goes into positioning PT cables before a concrete pour.

Source: https://www.gp-radar.com/article/how-post-tensioned-cables-are-anchored-in-concrete-slabs

Once the concrete has cured (3-10 days) the molds used to frame the floor are removed and a hydrolic jack pulls on the cable (highlighted) to give the floor its intended strength. 

Source: https://www.gp-radar.com/article/how-post-tensioned-cables-are-anchored-in-concrete-slabs