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The last are used in concrete-steel composite structures as shear connectors. [6] Other uses include anchoring machines to poured concrete floors [7] and buildings to their concrete foundations. Various typically disposable aids, mainly of plastic, are produced to secure and align cast-in-place anchors prior to concrete placement.
Mason, a tradesperson skilled variously in brick and blocklaying, concrete finishing (the placement, finishing, protecting and repairing of concrete in construction projects). [7] Also stonemason, marble setter and polisher, tile setter and polisher, terrazzo worker and finisher. Hod carrier is a subsidiary trade (also see Laborer).
Post-tensioned concrete is a variant of prestressed concrete where the tendons are tensioned after the surrounding concrete structure has been cast. [ 1 ] : 25 The tendons are not placed in direct contact with the concrete, but are encapsulated within a protective sleeve or duct which is either cast into the concrete structure or placed ...
The structural frame of a pole building is made of tree trunks, utility poles, engineered lumber or chemically pressure-treated squared timbers which may be buried in the ground or anchored to a concrete slab. Generally the posts are evenly spaced 8 to 12 feet (2.4 to 3.7 m) apart except to allow for doors.
The posts are then placed upright into the ground and concrete is poured to cement them into place. Once they are set, the horizontal rails are affixed to the posts using fasteners, and finally the pickets can be attached to the horizontal rails. By far the most time-consuming part of installing a picket fence is setting the posts.
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The methods of placement of reinforcement are preinstallation, co-installation, and post-installation. [6] The examples of each are pre-installed meshes, fibers mixed with concrete, and post-tensioning cables, respectively. The classification based on the structural action is once again the same as that in conventional concrete.
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