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The screed moves back and forth, as friction screeds or "roller" screeds level the concrete, filling holes and lowering any high spots. [1] Power screeds can be powered by gas, electricity or hydraulics. [citation needed] In concrete, prior to the mix drying, the concrete should be smoothed out on the desired surface.
The screed on this paver spreads and smooths the asphalt.. Screed has three meanings in building construction: . A flat board (screed board, floating screed) or a purpose-made aluminium tool used to smooth and to "true" materials like concrete, stucco and plaster after they have been placed on a surface or to assist in flattening; [1]
Adjusting screed settings will change the placement depth and width, as well as amount of material being placed. Many modern screeds can be run in an automatic mode, too. [1] Because the only connection between the asphalt paver and the screed is the tow arm, the screed can "float" vertically relative to the paver.
This screed, along with the tamper bar that permitted uniform material density of the finished surface were the two key features that made the machine successful. Early pavers had a hopper which material was dumped into and spread by an auger. The floating screed was supported by runners that traveled on the prepared base material.
In surveying and construction, the laser level is a control tool consisting of a rotating laser beam projector that can be affixed to a tripod. The tool is leveled according to the accuracy of the device and projects a fixed red or green beam in a plane about the horizontal and/or vertical axis.
Laborer - Ladder - Lakhori bricks - Laminate panel - Lath and plaster - Laser level - Launching gantry - Lean construction - Level luffing crane - Lewis (lifting appliance) - Lift slab construction - Lifting equipment - Lighting - Light tower - Lightening holes - Lime mortar - Line of thrust - Live bottom trailer - Living building material ...