Is it okay to add water to concrete, to add water to concrete? Why does the builder add water?

Water is added to the concrete, mainly because the concrete is found to have poor fluidity during pouring. This may be related to the initial mix design, and it is recommended that the contractor be asked to change the mix ratio.

And the supervision can not be supervised to cut corners as the principle, not stealing the cost is not necessarily a good construction unit, the quality of the project is also important.

If water is added, the water-cement ratio of the concrete is changed, and there is no forced stirring, so the strength is greatly affected.

It is strictly forbidden to add water to commercial concrete, and the slump increases after adding water. The strength of the concrete will be affected by the member. You can issue a notice to the supervising engineer to the construction party or check the concrete slump on site.

It's just to improve the degree of slump. Improve the working properties of concrete mixtures. Easy to apply.

It has nothing to do with the cost. It can only be said that the label is lowered, because the cement remains unchanged or the powder remains the same, which increases the water consumption. The water-cement ratio is relatively high.

Directly reduce the intensity. Resolutely put an end to it.

This is definitely not possible, adding water at will not only causes the strength of concrete to be reduced, but also affects the durability of concrete, so that the life of the engineering structure is reduced, so it should be strictly forbidden to add water. If it is not good to construct, the mix ratio should be redesigned or analyzed by the tester to determine how to adjust.

No construction unit was stupid enough to allow workers to add water to the concrete at will.

What do you think? I just want to finish it quickly

When the water depth is shallow, the pouring method can be used for construction, and when the water depth is deep, the vertical pipe method can be used to pour, and the general mix ratio is the same as that of the onshore concrete, but due to the influence of water, it will generally be lower than the onshore concrete under the same conditions by a strength grade, so a strength grade should be improved, such as the requirement to reach C25, it should be matched to C30. In addition, there is a method of accelerating the coagulant, which is more reliable, but the cost is relatively high.

1.Pleated catheter method.

The conduit method is used to pour underwater concrete, which is suitable for the situation that the water depth does not exceed 15 25m. The diameter of the conduit is 25 30 cm, each section is 1 2 m long, connected with a flange of rubber lining, and an automatic opening and closing valve should be installed at the bottom, and a funnel should be installed at the top. The number and location of the conduit should be determined according to the pouring range and the radius of action of the conduit.

Generally, the radius of action should not be greater than 3m.

2.Folding bag masonry method.

Underwater concrete is poured by the bag masonry method, which is to put the concrete half-filled into a firm sack or cloth bag, and the divers will pour it underwater. The pores of the bag should allow the mortar to seep out, but it should not be too large.

With this pouring method, the layers between the bags are cemented with each other, although the cement slurry that can be extruded from the bag holes is cemented with each other, but its integrity is very poor after all. The slump of this kind of concrete is suitable for 5 7cm, and dry-mixed concrete shall not be used. Concrete bags should be staggered and close to each other.

3.Folding pouring method.

The pouring method of pouring underwater concrete can be used when the water depth on the shore is not excessive. The newly poured concrete pile is squeezed into the poured concrete body by means of ramming or vibration, so that only the leading concrete slope is in direct contact with the water. The slump of concrete should be 7 10cm.

This method should be used to shorten the pouring time as much as possible, and the concrete poured first shall not be solidified before the pouring work is completed.

4.Folded flexible tube method.

The flexible pipe method uses a flexible hose to transport concrete, and uses the pressure of the surrounding water on the hose to control the falling speed of the concrete.

5.Folding live bottom gondola method.

The live bottom gondola method is to load the concrete in the closed gondola that can open the bottom, go directly to the pouring site through the water layer, and then open the bottom to unload.

6.Folded prefilled aggregate grouting method.

The underwater prefilled aggregate grouting method requires the cement mortar to have a certain fluidity degree and a certain anti-segregation ability. The grouting pressure is related to the consistency of the grouting liquid, the average particle size of the prefilled aggregate and the required diffusion radius. If the average particle size of the prefilled aggregate is within 150mm and the diffusion radius is within it, when the water depth is zero, the slurry pressure at the bottom of the pipe is about 50 150kpa.

There is a water tank surface, and the slurry pressure at the bottom of the pipe should be added to the water pressure caused by the corresponding water depth.

Underwater concrete pouring construction method:

After the second hole cleaning, the concrete is poured immediately.

1) Concrete requirements: the concrete strength grade is one grade higher than the design strength, the coarse aggregate is made of crushed stone, the particle size is 5 20mm, and the sand is medium sand with good gradation. When the water-cement ratio of concrete is below, slag cement is preferred, and the sand content of concrete is 40% to 45%.

The slump is 20 2 cm, and the diffusion is 34 38 cm. The initial setting time of concrete is 3 4h.

2) Underwater concrete pouring: calculate the initial irrigation amount during pouring, process the leakage half, require a certain impact energy, can squeeze out the conduit slag, and can bury the conduit into the concrete at a depth of not less than 1m.

The first pouring adopts concrete water trap (water trap is suspended at the lower mouth of the concrete funnel with 8 steel wires first), when the concrete is filled with the funnel, cut the steel wire, and the concrete is lowered to the bottom of the hole, and the mud is discharged.

The concrete pouring is carried out continuously, and the pipe is extubated with pouring, and the stop time does not exceed 15min in the middle to avoid the pile breaking accident caused by the pause in the middle. In the whole pouring process, the conduit is buried deep in the concrete, and the pressure difference between the concrete inside and outside the conduit is used to make the pouring surface of the concrete gradually rise, and the rising speed is not less than 2m h, until it is 1m higher than the design elevation.

At the end of pouring, inject an appropriate amount of water into the hole to dilute the mud in the tank and discharge it out of the tank, and make the concrete column in the pipe have a certain height (more than 2m), so as to ensure that the mud is all discharged.

Concrete cannot be added with water.

After adding water, the concrete forms a weak point, and the commercial concrete is stirred unevenly after adding water on the spot, resulting in the formation of a weak layer of concrete, and the strength is uneven, which ultimately affects the overall strength of the concrete.

The addition of water will change the original mix ratio of the concrete. The commercial concrete mix ratio is determined by trial matching, and the influencing factors of the construction site have been considered, and the original mix ratio is changed after adding water to the site, resulting in a larger water-cement ratio and a decrease in concrete strength.

In addition, the concrete compactness is reduced after water is added, resulting in the reduction of the self-waterproof ability of the concrete, especially when water is added before the initial setting after the concrete is poured.

When commercial concrete is pumped and poured, workers often add water to the concrete for easy operation. Sometimes the high temperature in summer, or the long waiting time of the tanker, causes the workability of the concrete to be reduced, and workers will also add water to the concrete. These cases of adding water to the concrete without permission are not allowed, which will affect the quality of concrete construction.

Is it OK to add water to concrete? Why does the builder add water?

Is it OK to add water to concrete? Why does the builder add water? Do you mean adding water during the pouring process or after pouring?

It is generally not allowed to add water in the pouring process, because it will reduce the grade of concrete, disturb the concrete mix ratio, water-cement ratio, and reduce the concrete strength. However, in the actual construction, when the concrete collapse is too small (too thick and not easy to pour), the workers are bright wax for the convenience of adding water to facilitate the construction. Be careful to control the amount of water you add, never add a lot of water!

The formal practice is to add a water reducer to the concrete, so that the concrete slump increases to achieve the purpose of easy construction. [Tips: If the supervisor or the owner is demanding, pay attention to avoid when adding water] After pouring, water is generally poured on the surface of the formed concrete.

This is a curing process, and there are the following provisions in the specification: The concrete should be covered and moisturized within 12 hours after the concrete is poured (the concrete can be watered and cured, and the soil curing liquid or cover must be taken within 12 hours in summer) The time of concrete watering and curing: for the concrete mixed with Portland cement, ordinary Portland cement or slag Portland cement, not less than 7 days; For concrete mixed with retarding admixtures or impermeability requirements, not less than 14 days.

The number of watering times should be able to keep the concrete in a moist state; The cured concrete should be covered with plastic sheeting, and all exposed surfaces should be tightly covered, and condensation should be kept in the plastic sheeting.

Concrete cannot be added at will, but some workers may add water to the concrete for convenience when operating. For example, during the construction of high temperature in summer, workers will add water to the concrete, which is more common, so what are the consequences of adding water without permission?

1. What is the impact of adding water to concrete?

1. If you add water to the water concrete without permission, it will destroy the original ratio, because if the concrete has been configured before, the seepage ridge can be used directly. Adding water without permission will destroy the original ratio, resulting in a relatively large ratio of water and lime, so the strength of the concrete will be greatly reduced, which will seriously affect the quality of construction.

2. After adding water, the concrete will form a weak surface, and if the water is added and stirred on site is not uniform, a part of it will form a weak layer, and the strength will be unbalanced, which will affect the overall strength and not meet the requirements.

3. After adding water, the density will be reduced, and its waterproof performance will also be affected. Especially before the concrete has set, the effect of adding water is even more serious.

2. If you want to add water, how should you do it?

1. If you have to add water, you must be able to deal with it according to the requirements of the ratio, and while adding water, you must stir it evenly so that it will not lead to the problem of floating slurry in the concrete.

2. Before adding water, you need to get the consent of the site manager, if it is a concrete tanker, it must be mixed at high speed for a few minutes, so that the internal mixing is even, and then it can be used on site.

3. There are some grades of concrete that can be added with water, such as Dongyu C10 model or C15 model can be added with water, but you should also pay attention to the appropriate amount, otherwise it will affect the strength of the concrete, so do not add excessive water, to be moderate.

4. When adding water, we can also add other admixtures to adjust the viscosity of the concrete, which can ensure that the strength of the concrete reaches a certain standard and does not affect the construction requirements of the site.

Summary: If you add water privately, it will have a great impact on the strength of the concrete, but if you have to add water, then it must also meet the standards, and it is the most fundamental principle not to affect the strength of the concrete.

Concrete is an important material, and it is used in our daily life, such as floors, walls or when building houses. Can I add water when using concrete hailstones? What happens if I add water?

1. What is the impact of adding water to concrete?

1. Concrete can not be added at will, if water is added during on-site construction, it will lead to uneven surface phenomenon and will produce floating slurry. If the concrete is added with water, the strength will not meet the requirements, which will affect the overall use effect of the concrete.

2. Because the ratio of concrete will be changed after adding water, if the on-site construction is made of commercial concrete, that is to say, it has been blended, and it is not possible to add water. This kind of concrete has been configured in strict accordance with the proportion, if the water is added later, it will affect the effect of construction, such as after watering, its cement and lime ratio will become larger, the strength will be reduced, and the waterproof ability will also decrease.

2. Under what circumstances can water be added?

Because of the long-term transportation of some commercial concrete, coupled with the hot weather, a large amount of water will be lost at this time, and then water can be added appropriately to adjust the proportion of concrete. However, it is not possible to add water without permission, and the following requirements need to be met.

1. If water can be added, it must be treated in strict accordance with the ratio, and it needs to be stirred by professional equipment, so that the added water can be stirred evenly.

2. If it is to add water at the construction site, it needs to be agreed by the on-site staff, and the concrete mixer truck can be used to run at high speed for a few minutes before it can be mixed evenly.

3. If you use concrete with the number C10 or C15, you can add water, but you must also ensure that the strength meets the requirements, and you can not add excessive water, in order to ensure that its strength is not affected, you can also add admixtures.

Summary: Under normal circumstances, the concrete is successfully mixed with water during on-site construction, and can be used directly, but if the ratio of cement, sand and water is not correct, water can be added appropriately in this case, but the quality of concrete must be guaranteed.

1. According to the water source, the water used for concrete mixing can be divided into drinking water, surface water, groundwater, seawater, and industrial wastewater after proper treatment or disposal.

2.It meets the national standard of drinking water and can mix all kinds of concrete. Surface water and groundwater shall be inspected in accordance with the provisions of this standard before being used for the first time.

3.Seawater can be used to mix plain concrete, but not to mix reinforced concrete and prestressed concrete.

4.Concrete with finishing requirements should not be mixed with seawater.

5.The scrubbing water of the equipment of concrete production plants and commercial concrete plants can be used as part of the water for mixing concrete. However, it is necessary to pay attention to the influence of the cement and admixtures contained in the scrubbing water on the mixed concrete, and the content of chloride, sulfate and sulfide in the final mixing water should meet the requirements of 4.

6.Industrial wastewater can be used to mix concrete after passing the inspection, otherwise it must be treated and can only be used after qualifying.