In pre-tensioned concrete, the prestressing is obtained by utilizing metal or polymer tendons or bars which are subjected to some tensile drive before casting, or for post-tensioned concrete, immediately after casting.
Blocking freezing is A very powerful precaution, as formation of ice crystals may cause harm to the crystalline composition with the hydrated cement paste. In the event the area of the concrete pour is insulated from the surface temperatures, the heat of hydration will protect against freezing.
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This grouting is undertaken for three major purposes: to protect the tendons in opposition to corrosion; to completely lock during the tendon pre-tension, thereby getting rid of the prolonged-time period reliance on the top-anchorage systems; and to improve specified structural behaviors of the final concrete framework.[ten]
Grouted aggregate is another approach to forming a concrete mass underwater, in which the varieties are full of coarse mixture and also the voids then fully crammed from the bottom by displacing the water with pumped grout.[130]
Prestressed concrete is really a type of concrete exactly where interior anxiety is placed on the concrete ahead of external masses are applied to lessen the here effect on the potential tensile stresses.
One more well-liked outcome for flooring and table tops is polished concrete where by the concrete is polished optically flat with diamond abrasives and sealed with polymers or other sealants.
Bonded tendons include bundled strands put within ducts Found in the encompassing concrete. To be sure total security on the bundled strands, the ducts should be tension-full of a corrosion-inhibiting grout, devoid of leaving any voids, pursuing strand tensioning.
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Laminate is A reasonable flooring selection for homeowners preferring an alternative choice to carpet but want to stay away from the price of hardwood or tiles.
Carbon nanofibers is usually extra to concrete to reinforce compressive toughness and gain a greater Young's modulus, as well as to improve the electrical Houses required for strain checking, damage analysis and self-well being เสาไฟฟ้าคอนกรีตอัดแรง checking of concrete.
Representative Main samples are taken from the poles and analyzed to make sure that excellent and longevity standards are satisfied. 3rd-bash inspection organizations also take Main samples all through regular visits to confirm the plant’s quality Handle tactics.
In the situation of strengthened concrete, the component supplies are almost always concrete and metal. Both of these materials form a strong bond jointly and can easily resist various used forces, effectively performing as a single structural ingredient.[124]
Usual films are made of wax or related hydrophobic compounds. Following the concrete is sufficiently here cured, the movie is allowed to abrade through the concrete through usual use.[eighty]