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Precast concrete is a construction product produced by casting concrete in a reusable mold or "form" which is then cured in a controlled environment, transported to the construction site and maneuvered into place; examples include precast beams, and wall panels, floors, roofs, and piles.
A splayed or wedge coping is one that slopes in a single direction; a saddle coping slopes to either side of a central high point. [ 2 ] Coping may be made of stone (capstone), brick , clay or terracotta , concrete or cast stone , tile , slate , wood, thatch , or various metals, including aluminum , copper , stainless steel , steel , and zinc ...
Three precast segmental exit/entry ramps constructed both by the use of an overhead launching gantry and, for some spans, a heavy duty falsework support system. The dual three lane approaches on either side of the main bridge are 27.8 m (91 ft) wide, the width of the main bridge deck is 28.8 m (94 ft) and the ramp structures are 9.87 m (32.4 ft ...
Glass fiber reinforced concrete (GFRC) is a type of fiber-reinforced concrete. The product is also known as glassfibre reinforced concrete or GRC in British English. [1] Glass fiber concretes are mainly used in exterior building façade panels and as architectural precast concrete. Somewhat similar materials are fiber cement siding and cement ...
[32] [36] Solidia Technologies fires its brick and precast concrete at lower temperatures and cures them with CO 2 gas, claiming to reduce its carbon emissions by 30%. [32] [36] Carbonaide uses carbon dioxide in the curing phase of precast concrete production and has demonstrated up to 40% savings in cement consumption with their first client. [39]
Logo of Eurocode 2 An example of a concrete structure. In the Eurocode series of European standards (EN) related to construction, Eurocode 2: Design of concrete structures (abbreviated EN 1992 or, informally, EC 2) specifies technical rules for the design of concrete, reinforced concrete and prestressed concrete structures, using the limit state design philosophy.
The precast concrete slab has tubular voids extending the full length of the slab, typically with a diameter equal to the 2/3–3/4 the thickness of the slab. This makes the slab much lighter than a massive solid concrete floor slab of equal thickness or strength. The reduced weight also lowers material and transportation costs.
Pre-tensioned concrete is a variant of prestressed concrete where the tendons are tensioned prior to the concrete being cast. [1]: 25 The concrete bonds to the tendons as it cures, following which the end-anchoring of the tendons is released, and the tendon tension forces are transferred to the concrete as compression by static friction.