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Shotcrete, gunite (/ ˈ ɡ ʌ n aɪ t /), or sprayed concrete is concrete or mortar conveyed through a hose and pneumatically projected at high velocity onto a surface. This construction technique was invented by Carl Akeley and first used in 1907. [1]: 7 The concrete is typically reinforced by conventional steel rods, steel mesh, or fibers.
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War sand is sand contaminated by remains of projectiles used in war. This kind of sand has been found in Normandy, since its invasion, among other places. [1] In 1988, the sand on Omaha Beach was discovered to contain man-made metal and glass particles deriving from shrapnel; 4% of the sand in the sample was composed of shrapnel particles ranging in size between 0.06 millimetres (0.0024 in ...
They rested on a concrete mat between ten and thirty meters wide, sunk a meter or two into the ground (to prevent any attempt to tunnel underneath them and place explosive charges). On top of the mat were the teeth themselves, truncated pyramids of reinforced concrete about a meter in height in the front row, to two meters high in the back.
The history of thinset dates back to the post-World War II era when the tile industry sought more efficient methods for tile installation. [7] Before thinset, the standard method for installing tiles was the thick-set or mud-set method, which involved a thick layer of a sand and cement mixture.
Masonry walls are built with a damp-proof course to prevent rising damp, and the concrete in foundations needs to be damp-proofed or waterproofed with a liquid coating, basement waterproofing membrane (even under the concrete slab floor where polyethylene sheeting is commonly used), or an additive to the concrete. Within the waterproofing ...
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