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Concrete is a mixture of coarse (stone or brick chips) and fine (generally sand and/or crushed stone) aggregates with a paste of binder material (usually Portland cement) and water. When cement is mixed with a small amount of water, it hydrates to form microscopic opaque crystal lattices encapsulating and locking the aggregate into a rigid shape.
Asphalt concrete (commonly called asphalt, [1] blacktop, or pavement in North America, and tarmac or bitumen macadam in the United Kingdom and the Republic of Ireland) is a composite material commonly used to surface roads, parking lots, airports, and the core of embankment dams. [2] Asphalt mixtures have been used in pavement construction ...
The sale of labor remains a necessary means of subsistence and a basic necessity for the production process, regardless of the level of productivity. In short, Postone's argument suggests that the commodity form structures and subjugates society through a historically specific and abstract form of temporality. Capital and Labor
There are two application methods for shotcrete. dry-mix – the dry mixture of cement and aggregates is filled into the machine and conveyed with compressed air through the hoses. The water needed for the hydration is added at the nozzle. wet-mix – the mixes are prepared with all necessary water for hydration.
Roman concrete, like any concrete, consists of an aggregate and hydraulic mortar, a binder mixed with water that hardens over time. The composition of the aggregate varied, and included pieces of rock, ceramic tile, lime clasts, and brick rubble from the remains of previously demolished buildings. In Rome, readily available tuff was often used ...
According to Mackeurtan, Purchase and sale ( emptio venditio) is a mutual contract for the transfer of possession of a thing in exchange for a price. It has three essentials: consent ( consensus ad idem ); a thing sold ( merx ); and a price ( pretium ). [8] Remember that a sale contract is a special form of contract, and so all law discussed ...
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