Hey, I was just a “hod carrier” when I was young, and just an engineer in undergrad, and only taught city-building and the Built Environment at Harvard Grad School, but something looks wrong here. I could be wrong.
The mix seems more like they poured what they cleaned out of the truck, and the forms look like they stole two by fours off of someone else’s job site.
It doesn’t look like a use-case for aerated or cellular concrete, but who knows.
Fun video. I’m sure the cleanup cost was as much as the redo.
1. Slump Test: This is the most common test for concrete workability, which indirectly relates to viscosity. The test measures the consistency of the concrete in its fresh state. A higher slump indicates a more fluid (less viscous) mix, while a lower slump indicates a stiffer (more viscous) mix.
2. Flow Table Test: This test measures the spread of concrete under its own weight, giving an indication of the flowability, which is related to viscosity. The larger the spread, the lower the viscosity.
3. Viscometers: There are specialized viscometers designed for concrete that measure its viscosity more directly. These devices, such as the concrete rheometer, measure the force required to rotate a spindle or drum in the concrete mix, providing a quantitative measure of its viscosity.
4. V-Funnel Test: This test is used for very fluid concrete types, like self-consolidating concrete. It measures the time it takes for a certain volume of concrete to flow through a V-shaped funnel. Faster flow times indicate lower viscosity.
The correct viscosity (or workability) is crucial for concrete. If it’s too viscous, it may not flow into forms or around reinforcement easily. If it’s too fluid, it may segregate, leading to weak spots. The desired viscosity depends on the specific requirements of the construction project, such as the complexity of the forms, the amount and spacing of reinforcement, and the method of concrete placement.
Thanks Ed.
