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201 concrete steps rise about 100 feet to the intersection of Upper Mesa Road and Amalfi Drive. There is no railing except for the topmost 18 steps, so descending requires caution. (The stairs are sometimes incorrectly called the "La Mesa stairs"--La Mesa Drive is elsewhere in Santa Monica, and there is a La Mesa Stairway in the city of La Mesa ...
Exorcist. steps. Coordinates: 38°54′19.96″N 77°4′12.59″W. The Exorcist steps are concrete stairs, continuing 36th Street, [ 1] descending from the corner of Prospect St and 36th St NW, down to a small parking lot, set back from the intersection of M Street NW, Canal Rd NW, and Whitehurst Freeway NW in the Georgetown neighborhood of ...
Jersey barrier. A Jersey barrier, Jersey wall, or Jersey bump is a modular concrete or plastic barrier employed to separate lanes of traffic. It is designed to minimize vehicle damage in cases of incidental contact while still preventing vehicle crossovers resulting in a likely head-on collision. Jersey barriers are also used to reroute traffic ...
Tremie. A tremie is a watertight pipe, usually of about 250 mm inside diameter (150 to 300 mm), [ 1] with a conical hopper at its upper end above the water level. It may have a loose plug or a valve at the bottom end. A tremie is used to pour concrete underwater in a way that avoids washout of cement from the mix due to turbulent water contact ...
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 ...
A concrete mixer (also cement mixer) is a device that homogeneously combines cement, aggregate (e.g. sand or gravel), and water to form concrete. A typical concrete mixer uses a revolving drum to mix the components. For smaller volume works, portable concrete mixers are often used so that the concrete can be made at the construction site ...
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