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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. It is the original manufacturer of hook-and-loop fasteners, which de Mestral invented. [2]
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Velcro, the invention for which de Mestral is famous De Mestral first conceptualised hook and loop after returning from a hunting trip with his dog in the Alps in 1941. [ 5 ] [ 6 ] [ 7 ] After removing several of the burdock burrs (seeds) that kept sticking to his clothes and his dog's fur, he became curious as to how it worked.
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]
This places compression stress on the bricks and mortar, encouraging bulging or flaking. [3] A joint replacing mortar with elastomeric sealant will absorb the compressive forces without damage. [4] Concrete decking (most typically in sidewalks) can suffer similar horizontal issues, which is usually relieved by adding a wooden spacer between the ...
Bonded terrazzo is applied over a sand-cement mortar underbed which sits on top of a concrete slab. The sand-cement layer allows for variations in the finished concrete slab that it sits on. Monolithic terrazzo is applied directly over an extremely flat and high quality concrete sub-floor. Thin-set terrazzo does not require a concrete sub-floor.
RAF aircrew with one of their Bristol Beaufighters on a PSP airstrip at Biferno, Italy, August 1944. Marston Mat, more properly called pierced (or perforated) steel planking (PSP), is standardized, perforated steel matting material developed by the United States at the Waterways Experiment Station shortly before World War II, primarily for the rapid construction of temporary runways and ...
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