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Hook-and-loop fasteners, commonly known as Velcro (a genericized trademark), hook-and-pile fasteners or touch fasteners are versatile fastening devices that allow two surfaces to be repeatedly attached and detached with ease. Invented in the mid-20th century, they are widely used in clothing, accessories, and various industrial and consumer ...
Velcro IP Holdings LLC, [2] [4] [5] trading as Velcro Companies and commonly referred to as Velcro (pronounced / ˈ v ɛ l k r oʊ /), [1] is a British privately held company, founded by Swiss electrical engineer George de Mestral in the 1950s.
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Concrete is a composite material composed of aggregate bonded together with a fluid cement that cures to a solid over time. Concrete is the second-most-used substance in the world after water, [1] and is the most widely used building material. [2] Its usage worldwide, ton for ton, is twice that of steel, wood, plastics, and aluminium combined. [3]
Add to your spring cleaning checklist to repair your concrete steps. We have an 8-step guide to repair your concrete steps like a pro and skip the handyman.
In terms of cost and economics, one advantage of 3D printed concrete is that it does not require formwork, which is used to form the mold for conventional concrete pouring. Formwork can account for up to 50% of total concrete construction due to material and labor costs. [ 38 ]
A flat board (screed board, floating screed) or a purpose-made aluminium tool used to smooth and to "true" materials like concrete, stucco and plaster after they have been placed on a surface or to assist in flattening; [1] A strip of plaster or wood applied to a surface to act as a guide for a screed tool (screed rail, screed strip, screed ...
Equations (3) and (4) are the simplest formulae satisfying three requirements: 1) Asymptotically for both short and long times , ˙ (, ′), should be a power function of time; and 2) so should the aging rate, given by () /) (power functions are indicated by self-similarity conditions); and 3) (, ′) / ′ > (this condition is required to ...
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