How to maintain concrete? Generally speaking, what are the causes of concrete quality problems? The following is the main content of how to do a good job of concrete maintenance brought by Zhong Da Consulting for reference.

(1) quality problems and phenomena

Due to the inadequate curing of concrete, shrinkage cracks appear on the concrete surface after pouring, especially on the exposed surface of mass concrete and large area exposed concrete. It will seriously affect the growth of concrete strength and cause unqualified concrete strength. When the temperature is low, the strength of concrete cannot be guaranteed. When the strength of concrete is not formed, it will bear the load and the concrete will be destroyed.

(2) Cause analysis

(1) did not attach great importance to concrete curing;

(2) When it is dry at high temperature, the maintenance water on the construction site is insufficient;

③ No covering maintenance measures were taken;

④ The curing time is not enough;

(5) Before the concrete strength is less than 2.5Mpa, make it bear the load of pedestrians, templates and supports;

⑥ When the temperature is low, it is incorrect that the heating and heat preservation measures are not in place.

(3) Preventive measures

(1) For ordinary concrete, after pouring, it should be covered and watered as soon as possible after the slurry is collected. For hard concrete, concrete poured in hot weather, bridge deck and other large-area exposed concrete, shading nets should be added immediately after pouring, and water conservation should be covered after slurry collection. Covering shall not damage or pollute the concrete surface;

(2) When concrete is covered with formwork, the formwork should always be kept moist during curing.

(3) The water curing time of concrete is usually 7 days, which can be extended or shortened according to the humidity, temperature and additives of the air. Sprinkle water times to keep the concrete surface in a wet state;

(4) When the temperature is lower than 5℃, cover insulation measures should be taken, and water shall not be sprayed on the concrete surface;

(5) Before the concrete strength reaches 2.5Mpa, it shall not bear the load of pedestrians, transportation tools, templates and supports;

⑥ Protective measures such as plastic film or spraying chemical slurry can be adopted;

All landowners season curing concrete, should be carried out according to the relevant specifications of winter construction.

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