Download ACI 345R-11: Guide for Concrete Highway Bridge Deck by ACI Committee 345 PDF

By ACI Committee 345

The service-life functionality of concrete bridge decks, together with upkeep, fix, and rehabilitation wishes, is without delay with regards to the care exercised from the preconstruction via post-construction interval. This consultant presents innovations for bridge deck building according to concerns of sturdiness, concrete fabrics, reinforcement, putting, completing and curing, and overlays.

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Extra info for ACI 345R-11: Guide for Concrete Highway Bridge Deck Construction

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1 Ionization Smoke Sensors This kind of sensor can respond first to fast-flaming fires. A flaming fire devours combustibles extremely fast, spreads rapidly, and generates considerable heat with little smoke. Ionization models are best suited for rooms which contain highly combustible materials. These types of materials include cooking fat/grease, flammable liquids, newspapers, paint, and cleaning solutions. Inside the sensor, there is a clean chamber where gas for reference exists and a site chamber where air from the room can enter.

When wind hits a side wall, the muscle elements of this wall contract. Both types of computer-controlled muscle elements are made of polyamide fabric with an internal silicone hose. The tensile forces of the outer fabric are in a state of equilibrium with the internal pressure exerted on the membrane. 3 and 1 bar, thus regulating the axial force continuously and over a wide range. The horizontal girders, so-called ‘airbeams’, contribute to the stability of the structure. 25 m in the middle of the span, the airbeams are supported at the connection point of wall components and Y-shaped columns and are fixed in location with textile belts.

9] discussed in details the placement of these airflow sensors for control. 2 Orifice Plates These are based on a pressure difference across the pipe or duct by the actions of throttling the flow through an orifice and measuring the pressure difference. They are simple but prone to wear when used with liquids, especially those carrying small particles of dirt. They were extensively used in the past for piped liquids. Usually, HVAC reinforcement projects employ most of them for existing installations owing to their simple constructions as suggested by Elgar [5].

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