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Whitetopping is the covering of an existing asphalt pavement with a layer of Portland cement concrete.Whitetopping is divided into types depending on the thickness of the concrete layer and whether the layer is bonded to the asphalt substrate.
Blue concrete can also be made, at some expense. The pigments may be added at the concrete mixer. Alternatively, to guarantee repeatable color, some manufacturers supply ready-blended colored cements, using white cement as a base. To be "white", the powdered material must have a reflectance value in excess of 85%.
Concrete is the most widely used material in existence and is behind only water as the planet's most-consumed resource. [ 2 ] Cements used in construction are usually inorganic , often lime - or calcium silicate -based, and are either hydraulic or less commonly non-hydraulic , depending on the ability of the cement to set in the presence of ...
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The world’s oldest known wild bird has sparked “special joy” among scientists after she laid an egg – her first in four years – at the age of 74.
Whitewash is sometimes coloured with earths to achieve colours spanning the range of broken white, cream, yellow and a range of browns. The blue laundry dye (such as Reckitt's "Dolly Blue" in the UK, Ireland and Australia, Loulaki in Greece, or Mrs. Stewart's Bluing in North America), formerly widely used to give a bright tinge to boiled white ...