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Self-leveling concrete was invented in 1952 by Axel Karlsson from Sweden. The first product was a combination of wood glue, fine sand and cement with additives. [1] It was called flytspackel, which directly translates to "floating putty". The term self-leveling can be traced back to a patent applied by the company Lafarge in 1997. [2]
It enables the production of self-consolidating concrete and high-performance concrete. The water–cement ratio is the main factor determining the concrete strength and its durability. Superplasticizers greatly improve the fluidity and the rheology of fresh concrete.
Print/export Download as PDF ... move to sidebar hide. Self-levelling may refer to: Self-levelling suspension; Self ... Self-leveling compound This page was last ...
[8] [9] This early attempt was an important step on the road to self-leveling, even if a full load would cause the whole car to lower evenly, rather than maintain height. In 1957, Cadillac introduced the Eldorado Brougham, a Rolls-Royce Silver Cloud competitor, featuring a new Air suspension with a self leveling feature. [10]
[2] The charpai is a simple design that is easy to construct. It was traditionally made out of a wooden frame and natural-fiber ropes, but modern charpais may have metal frames and plastic tapes. The frame is four strong vertical posts connected by four horizontal members; the design makes the construction self-leveling.
When a strong acid is dissolved in water, it reacts with it to form hydronium ion (H 3 O +). [2] An example of this would be the following reaction, where "HA" is the strong acid: HA + H 2 O → A − + H 3 O + Any acid that is stronger than H 3 O + reacts with H 2 O to form H 3 O +. Therefore, no acid stronger than H 3 O + exists in H 2 O.
In geodesy and surveying, the use of a water level device extended over long distances (sometimes, kilometers) is termed hydrostatic levelling, after the principles of hydrostatic equilibrium and levelling.
The rod is used in levelling procedures to determine elevations and is read using a level. A Philadelphia rod consists of two sliding sections graduated in hundredths of a foot. On the front of the rod the graduation increasing from zero at the bottom. On the back of the rod the graduation decrease from 13.09 ft at the bottom to 7 ft.