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He explained it in the video. The amount of water was adjusted so the viscosity (well, workability) was identical between the samples in the second test. Less w
by kilna 2y ago
He explained it in the video. The amount of water was adjusted so the viscosity (well, workability) was identical between the samples in the second test. Less water in concrete has a huge positive influence on strength, and rough sand needs more water to be workable. Thus, for comparably workable samples, rounded sand concrete with less water was actually stronger.
- dyauspitr 2y agoBut given the right amount of water, which one has the higher absolute strength?
- mrguyorama 2y agoDefine "right" amount of water. There is no singular correct amount of water in a concrete mix. It is dependent on the properties you want, the materials you have available, how things are going that day, etc.
- dyauspitr 2y agoJust enough water for the given concrete to maximize for absolute strength.
- mlsu 2y agoI'm sure if you have an easy form like a regular cylinder that you just have to fill from the top, then the sharp sand is stronger in an absolute sense. It's when you have complex forms, logistics considerations on site, curing considerations like heat, using pretensioned steel rods, etc. Then you start to run into these workability tradeoffs and "strongest == best" is no longer true.