Setting of post-pouring belt for storage tank and curing of concrete
Release time: 2019/09/10 17:33:56 Browse: Times
Setting of post-belt
(1) Post-casting belt is a temporary construction joint set up to overcome harmful cracks that may occur due to temperature and shrinkage during the construction of reinforced concrete. The joint is retained for a period of time according to the design requirements and then poured to connect the entire structure into a whole.
(2) The setting distance of the post-casting belt shall be obtained by calculation under the conditions of effectively reducing the temperature difference and the shrinkage stress. The relevant code stipulates that: under normal construction conditions, if the concrete is placed in the open air, it is 20m.
(3) The width of the post-casting belt shall be considered to facilitate the construction and avoid stress concentration. Generally its width is 70-100cm. The rebar in the backstrip should be kept intact.
(4) Before pouring the concrete, the entire concrete surface must be treated in accordance with the requirements of the construction joint before pouring the concrete. Filled strip concrete can be slightly expanded or non-shrinking cement. It can also be mixed with ordinary cement by adding corresponding external additives, but it must be required that the strength level of the filled concrete is one level higher than the original structural strength, and it is maintained at least 15 days of wet curing.
Curing of concrete
(1) After the concrete is poured, it should be covered (plastic film, straw curtain) within 12 hours, and watered for curing.
(2) The watering times per day should be able to keep the warm condensed soil in a sufficient wet state, and watering twice a day at normal temperature.
(3) Spray the curing agent to form a protective film on the concrete surface to prevent water evaporation and achieve the purpose of curing.
(4) When covered with a plastic film, its surroundings should be pressed tightly, and there should be condensed water in the film. The water used for curing is the same as that used for mixing concrete.