1, concrete pavement paving is completed or soft anti-slide structure is completed, and maintenance shall be started immediately. All kinds of concrete pavements, bridge decks and slabs paved by machinery should be kept in good health by spraying curing agent and covering with moisture. Health care can be carried out in rainy days or when the water is sufficient, and wet health care methods such as covering with moisturizing film, geotextile, sacks, straw bags and straw curtains can also be adopted. , and it is not appropriate to adopt the water enclosure health care method.
2. When curing agent is sprayed on the concrete pavement for curing, the spraying should be uniform, the film thickness should be enough to form a completely closed wet film, and there should be no color difference on the sprayed surface. The spraying time should be carried out after the surface concrete bleeds. The spraying height should be controlled at 0.5 ~1m. When using the first-class curing agent, the minimum spraying dose should not be less than 0.30 kg/㎡. The minimum spraying dose of qualified products is not less than 0.35kg/㎡. Curing agents that are easily washed away by rain and have an impact on the strength and surface wear resistance of concrete shall not be used. When spraying a curing agent can't meet the requirement of more than 90% effective water retention rate, the method of spraying one layer of each curing agent or spraying one layer of curing agent and covering it can be adopted.
3. The initial curing time of covering plastic film should be based on not crushing the meso-anti-sliding structure. The thickness (toughness) of the paint film should be appropriate, and the width should be greater than 600 mm. When the two films are butted, the lap width should not be less than 400mm, and the film should always be completely covered when curing.
4. Covering for keeping in good health ① Use moisturizing film, geotextile, sacks, straw bags, straw curtains and other coverings for keeping in good health, and sprinkle water in time to keep the concrete surface moist all the time, so as to determine the times of sprinkling water every day.
(2) The temperature difference between day and night is greater than 10℃ or the average daily temperature is less than or equal to 5℃, and the concrete pavement should be kept warm and moist.
5. The curing time should be determined according to the growth of concrete flexural strength, and should not be less than 80% of the design flexural strength. Pay special attention to the moisturizing (warm) curing for the first 7 days. General curing days should be 14 ~ 2 1d, high temperature days should not be less than 14d, and low temperature days should not be less than 2 1d. For concrete pavement mixed with fly ash, the shortest curing time should not be less than 28d, and the days of low temperature should be appropriately extended.
6. At the initial stage of concrete slab curing, people, livestock and vehicles are forbidden to pass, and pedestrians can only pass after reaching 40% of the design strength. Temporary temporary bridges should be built in grade crossing during pavement maintenance. Only after the panel reaches the design bending strength can the traffic be opened.
The detailed information of "concrete pavement maintenance" can be found in Zhong Da Consulting & Building Link, and all relevant building construction information you want is available.
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