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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]
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.
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]
Superplasticizers (SPs), also known as high range water reducers, are additives used for making high-strength concrete or to place self-compacting concrete. Plasticizers are chemical compounds enabling the production of concrete with approximately 15% less water content. Superplasticizers allow reduction in water content by 30% or more.
Strong bases are leveling solvents for acids, weak bases are differentiating solvents for acids. In a leveling solvent, many acids are completely dissociated and are thus of the same strength. All acids tend to become indistinguishable in strength when dissolved in strongly basic solvents owing to the greater affinity of strong bases for protons.
Cruise ships use gyroscopes to level motion-sensitive devices such as self-leveling pool tables. [ 75 ] An electric powered flywheel gyroscope inserted in a bicycle wheel is sold as an alternative to training wheels.
If the mirror is not self-leveling, it is provided with visually readable level vials and manually adjustable screws for orienting the projector. A staff carried by the operator is equipped with a movable sensor, which can detect the laser beam and gives a signal when the sensor is in line with the beam (usually an audible beep).