How long does it take to maintain the cast in place cement floor slab before the formwork can be rem

The total curing time is 7 days, and it can be dismantled after 7 days. During the pouring process, the vibration duration should produce slurry on the surface of the concrete, without bubbles, and without sinking. The insertion points of the vibrator are evenly arranged in the shape of plum blossoms, and the sequence of the determinant movement is adopted, and the distance of the moving position should not be more than 40cm.

Ensure that there is no vibration leakage, but no vibration. After the concrete surface is pressed and wiped twice, it is covered and raised in time. After the concrete is finally set, sprinkle water first and fully moisten it, seal and cover it with plastic film, and check the surface of the plastic film frequently, but when there are no water droplets on the surface of the film, water should be sprinkled again.

The curing time of the roof from the 3rd basement to the underground mezzanine is 7 days, and the curing time of the roof of the 1st underground floor is 14 days. Extended Information: Requirements for Concrete Pouring:

1. The pouring of concrete should be carried out continuously, if it must be intermittent, the intermission time should be shortened as much as possible, and the secondary layer of concrete should be poured before the initial setting of the previous layer of concrete. The maximum intermittent time should be determined according to the cement variety, temperature and concrete setting conditions used, and more than 2h should be determined according to the construction joint.

Dispose. 2. In the concrete pouring process, uniformity and compactness should be controlled. Pump into the mold is mostly used for continuous pouring. When it cannot be poured continuously at one time, it can be left with a seam or a post-pouring belt.

Poured in blocks. 3. When pouring concrete on the construction surface, the distribution should be balanced. The formwork and support should be observed and maintained, and abnormal situations should be dealt with in time. Measures should be taken to avoid causing steel bars and embedded parts in the formwork.

and its locating parts are displaced.

If the cast-in-place floor slab wants to remove the bottom mold, the concrete strength must reach more than 75%, the general temperature is about 20 degrees or more, and the temperature below 20 degrees should be longer. It is best to rebound the strength or press an isotrophic test block before removing the mold. After all, when the quality of concrete cannot be controlled, the actual strength of the site shall prevail.

How much should the cast-in-place cement floor be maintained, and the template can be dismantled, and the general cast-in-place cement can be dismantled after the floor slab is maintained for three to five days.

1. The cast-in-place reinforced concrete floor slab should be watered and maintained for 7 days in summer.

The sprinkling curing time depends on the type of cement for concrete prepared with Portland cement, ordinary Portland cement or slag Portland cement, which should not be less than 7 days.

The cast-in-place floor slab can be removed in a week in summer.

For cast-in-place floor slabs, the mold can be removed in a few days, and it can only be decided according to the change of seasons. If it is constructed in winter, the temperature is relatively low, so the concrete growth will be relatively slow, and it will basically take about two weeks to extend the time of demoulding. However, in the summer, because the temperature itself is relatively high, it is affected by humidity and temperature, so the time to remove the mold will be accelerated.

Basically, you can remove the mold in a week. At this time, the strength has reached the standard, so the time to remove the mold in winter can not be too early, and the time to remove the mold in summer needs to be advanced.

Cast-in-place floor slab requirements:

1. If the cast-in-place floor slab is adopted, the thickness of the floor slab of the rural self-built house should reach a certain standard. According to the standards set by our country, the range is between 80 160 mm. The reason why there is such a big difference is mainly to look at the size of the floor slab, including the standard of reinforcement.

2. The thickness of the poured floor slab cannot exceed the standard, otherwise it will lead to a relatively large self-weight, so the beam should be considered, so this thickness needs to be calculated by the designer. Of course, there is a certain amount of error, which is also allowed, and the normal error range is between -5 mm and +8 mm.

At an average temperature of 25 degrees, it reaches 75% of the intensity in 8 days and 100% in 22 days. Generally, the mold can be removed in 15 days!

According to the Code for Acceptance of Construction Quality of Concrete Structure Engineering, the first formwork removal has clear provisions. It should be controlled by intensity. Now there should be a same-condition curing specimen.

Generally 7 days, if there is an early strength report, the strength reaches 75% of the design strength.

How many days can cast-in-place floor slabs be removed in summer? Kiss! Hello, it's a pleasure to answer your <> for the jujube god

The pro-cast-in-place floor slab can be dismolded in 7 days in summer, and the cast-in-place floor slab can only be removed after 20 days in summer. 1. Cast-in-place concrete should reach its due strength, from after pouring, to achieve its due strength, it takes 28 days to reach 65% to 70% of its due strength, especially in summer, after pouring in situ, due to the sprinkling is not timely, its surface seems to have solidified, in fact, it is far from reaching a certain strength in less than a certain time. 2. Especially the cast-in-place floor slab, its strength requirements are very strict, and failure to reach the strength will leave potential safety hazards.

Therefore, the mold cannot be forcibly removed in order to meet the deadline. If time does not allow, it is necessary to do a good job of supporting the lower part of the floor slab, so as not to cause safety hazards to the floor slab. 3. In view of the above factors, the cast-in-place floor slab demoulding time must be controlled at about 20 days, although it is in summer, the surface has actually solidified.

But don't rush it, but also wait until 15 days later, the bottom is supported and then the mold is removed. In summer, it takes more than a week to reach the intensity specified by the code. More than a week.

The pouring floor slab demoulding time is not determined by days, but by strength. In addition to considering the strength and support span, the grade of concrete strength and the floor slab should also be considered in the construction of the demolition formwork, that is, when the span of the floor slab is less than 2 meters, the strength reaches more than 50% and the formwork can be removed; When the span is about 2-8 meters, even in the summer when the temperature is high, it will take more than a week to reach the liquid I hope mine can help you!

Do you have any other questions?

It is not by day, but by the compressive strength of the curing test block under the same conditions of different components to determine the timing of mold removal.

According to the compressive strength of the same condition curing test block of different components to determine the demoulding time, check the concrete structure specification to understand.

Structure Type Structure Span Design Strength Standard (%)

Plate l 2 50

2＜l＜8 ＝75

l＞8 ＝100

Beam l 8 75

l＞8 ＝100

Cantilever member 100

1. How long after concrete pouring can the formwork be removed?

In general, it takes 2 to 3 days to remove the mold after pouring. However, the template has a bottom film and a side film, and the demoulding time varies from place to place. It will also be affected by weather factors, and the mold removal time is not standardized.

If the side membrane is poured on the same day, the formwork can be removed the next day after the concrete is poured. However, in winter, the temperature is relatively low, and the concrete has not yet been formed, so the waiting time takes about 3 days.

2. What should I pay attention to when removing concrete formwork?

1.Must meet the design requirements. If there is no design, it must be implemented in accordance with other provisions.

2.If there is no load-bearing formwork, it is necessary to ensure that the edges and corners of the concrete surface are not damaged before dismantling, so this is very important.

3.If it is a load-bearing formwork, it can only be dismantled after the construction conditions meet the relevant regulations. For example, it must be between 50% and 100% strong to be qualified.

4.When we are in the process of removing the formwork, if we find that the strength of the concrete has not reached the specified requirements, we must stop the removal of the formwork immediately and deal with it properly. The qualification requirements must be met before the mold can be dismantled, otherwise it will bring safety hazards.

5. In the process of removing the formwork, do not knock hard, which will make the concrete on the surface of the building fall directly, thereby damaging the surface of the building. We should use a crane to lift it.

How long after concrete pouring can the formwork be dismantled 1, after the concrete is poured, when the strength reaches 70%, the formwork can be removed. 2. Generally about seven days, the intensity can reach 70%. The strength can reach 100% after 28 days.

3. Concrete pouring: refers to the process of pouring concrete into the mold until plasticization. 4. Operating conditions:

The formwork, steel bars, embedded iron parts and pipelines of the pouring concrete layer have all been installed, passed the inspection, met the design requirements, and completed the concealment and pre-inspection procedures. The shelves and walkways for pouring concrete have been erected and passed the inspection. , cement, sand, stone and admixtures have been inspected to meet the requirements of the relevant standards, and the test has issued a concrete mix notice.

The electronic gauge is accurate and flexible after inspection, and the vibrator (rod) is inspected and tested to operate normally. 5. Precautions: The warehouse surface should be cleaned before concrete pouring, and concrete pouring is allowed only after the pouring surface is qualified.

In order to ensure that the new and old concrete construction joints are well combined, before pouring the first layer of concrete, the cement mortar 2 3 of the same grade should be paved with concrete, and the mortar area of laying should be adapted to the concrete pouring strength, and the thickness of laying should be uniform, so as to avoid the phenomenon of being too thick or too thin. The pouring of concrete should be constructed by tiling method or step method, it is strictly forbidden to use the rolling pouring method, it should be carried out according to a certain thickness, order, direction, layering, and the pouring layer is flat, and the pouring wall should rise symmetrically when pouring, and the pouring thickness is generally 30 50Concrete pouring should be closed first and then vibrate, and it is strictly forbidden to vibrate instead of liquidating.

The vibration time is that the concrete coarse aggregate no longer sinks significantly, and begins to flood the slurry shall prevail, and the bubbles in the concrete will be vibrated out to avoid the vibration time is too short or too long, resulting in under-vibration, leakage vibration and over-vibration, and the vibration should be pulled out slowly after vibrating, and it is strictly forbidden to go too fast. The vibrating radius of concrete should not exceed the times of the effective radius of the vibrator, and the vibrator should be inserted into the lower concrete about 5, and should not be too deep, so as not to cause the over-vibration of the lower concrete. During the pouring of concrete, if there is a lot of water leakage on the surface, it should be removed in time and measures should be taken to reduce the water leakage.

It is strictly forbidden to open holes in the template to catch water, so as not to take away the mortar. In the process of pouring concrete, especially the pouring roof, the displacement and deformation observation point should be set, and a special person should be set up to regularly observe whether the template is offset, and a special person should be set up to inspect and strengthen the template. The technical department of the contractor shall prepare the corresponding work instructions and distribute them to the construction team, and send quality inspectors to supervise the implementation during the construction process.

For different parts of the building, the concrete demoulding time is also different, if it is the concrete poured by the main beam of the house, it takes more than 3-5 days; For the concrete of the roof, it needs to be carefully maintained, which takes at least 4-5 days; After removing the formwork, it cannot be put into use immediately, and some heavy objects need to be placed on it, and it can be removed after at least ten days.

What should be paid attention to when building houses in rural areas?

First, the foundation. 1. Moisture-proof practice: The concrete structure itself has a moisture-proof effect, and there is no need to do moisture-proof treatment. A continuous moisture-proof layer should be set at the foot of the inner wall and the outer wall at the foot of the ground floor of the building to isolate the capillary penetration of groundwater and avoid damage to the wall by moisture.

2. Waterproof practice: waterproof concrete, membrane waterproofing, coating waterproofing, cement mortar, etc. can be used to do waterproof treatment on the foundation.

3. Insect and ant prevention practices: drug treatment is required before backfilling and overhead boards, and attention should be paid to waterproof, moisture-proof and rainproof to prevent drug loss. According to the construction progress, flexible use, for the foundation with high groundwater level, you can start from the actual situation, increase the concentration of drugs, and appropriately control the amount of drugs.

Second, the wall. There are holes left by the external scaffolding tie on the exterior wall, and the holes must be plugged with bricks and other bricks before painting, and then painted with cement mortar, otherwise the part is very easy to seepage.

3. Simply supported beams and frame beams.

The longitudinally stressed steel bar of the simply supported beam is placed at the lower part of the beam, and the longitudinally stressed steel bar of the frame beam is placed at the upper part of the beam at the support position, and the lower part of the beam is placed at the middle part of the span. During on-site construction, it is necessary to pay attention to the placement of longitudinal stressed steel bars to prevent materials from being used in the wrong place and causing potential safety hazards.

Fourth, the cast-in-situ structure formwork support dismantling time.

The cast-in-place structure formwork support must be dismantled only when the cast-in-place reinforced concrete reaches a certain strength, and the cantilever structure can only be removed when the cast-in-place reinforced concrete reaches 100%.

Summary: The above is about the concrete can be dismantled in a few days, I don't know if you understand! There is a time limit for concrete dismantling formwork, so when building a house, you must strictly follow the time regulations and remember to dismantle it early.

Summary. After the cement solidifies, it needs to be watered for more than 3 days. Depending on the weather temperature, it should be maintained for at least 3 days in spring and summer, and the normal one is a week. In autumn and winter, especially in winter, it is best to avoid direct watering and contact with the cement surface, and it is best to water on the film after covering it, and maintain it for about a week.

After the cement solidifies, it needs to be watered for more than 3 days. Depending on the weather temperature, it should be maintained for at least 3 days in spring and summer, and the normal one is a week. In autumn and winter, especially in winter, it is best to avoid direct watering and contact with the cement surface, and it is best to water on the film after covering it, and maintain it for about a week.

After the cement solidifies, it needs to be watered and maintained after 4 5 hours, and watering for more than 3 days. The role of watering actually boils down to hydration. Hydration is a chemical reaction that allows the various ingredients of concrete to react and tightly combine to meet the strength requirements.

Theoretically, the wetter the place, the longer the time, the higher the strength of the concrete. Another role is to play a role in heat dissipation, when the concrete is hydrated, the internal high temperature can reach more than 60 degrees, the ordinary thermometer can instantaneously, the water can take away the heat emitted by the surface of the concrete through evaporation, and too high hydration heat will lead to cracks inside the concrete.

Dear, I wish you a happy life<>