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United States weight laws under the Federal Bridge Formula (FBF) require a three-axle ready mixed concrete truck to weigh 48,000 pounds (22,000 kg) or under. This leaves only 18,000 pounds (8,200 kg) for concrete to be carried, as 30,000 pounds (14,000 kg) is the tare weight of the truck.
A w/c ratio higher than 0.60 is not acceptable as fresh concrete becomes "soup" [2] and leads to a higher porosity and to very poor quality hardened concrete as publicly stated by Prof. Gustave Magnel (1889-1955, Ghent University, Belgium) during an official address to American building contractors at the occasion of one of his visits in the ...
In civil engineering and construction, the neat volume is a theoretical amount of material.. For earthworks, it can refer to the volume either before native material is disturbed by excavation, or after placement and compaction is complete.
The phase composition of a particular cement can be quantified through a complex set of calculation known as the Bogue formula. To avoid the flash setting of concrete, due to the very fast hydration of the tricalcium aluminate ( C 3 A ), 2–5 wt. % calcium sulfate is interground with the cement clinker to prepare the cement powder.
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Concrete creep is essentially the sagging of concrete over time. Creep and shrinkage of concrete are two physical properties of concrete.The creep of concrete, which originates from the calcium silicate hydrates (C-S-H) in the hardened Portland cement paste (which is the binder of mineral aggregates), is fundamentally different from the creep of metals and polymers.
How long it takes to walk 10,000 steps depends on a few factors, but there are ways to estimate the time. ... The lore of the 10,000-step benchmark isn’t concrete, ... If you work from home ...
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