Can I pour the foundation parts

When pouring reinforced concrete foundation required volumes of the house often exceed several cubic meters.Large construction companies are addressing this problem with the help of heavy machinery - Concrete mixer and, with their help, the solution is mixed and fed into the formwork.However, private developers, this technique does not always afford, in addition, small areas may not be access routes for heavy vehicles.Part of the problem will help solve the concrete mixer, but the volume of the solution being prepared in one load, thus limited.Do builders this raises the question: is it possible to pour a foundation in parts?Does this affect the performance characteristics and durability of the foundation?

stages of maturation

concrete Concrete is a mixture of cement and fillers - sand, gravel, expanded clay - water.To improve the fluidity of the solution, improving cold resistance and impart specific properties in the concrete mix are also added various additives and plasticizers.

slurry after cooking is poured into a form, called a formwork and then the concrete begin irreversible processes:

1. concrete grasp. During this stage, the liquid becomes a concrete solution to the solid state due to the interaction of cement components and water.However, the connection between the components is still very fragile, and under the influence of the load may be destroyed, and the re-setting of the solution does not occur.

Lasts this phase, depending on the air temperature from 3 hours to 1 day.The lower the temperature, the longer the concrete hardens.In the initial stages of setting it remains liquid without any structural changes.If during this time add a new formwork concrete portion.No destruction of the cement bonds will not happen.For a temperature of 20 ° C 'liquid' stage lasts about 2 hours, at zero temperature, it lasts about 6-8 hours.

can extend the time before the setting of concrete by constant agitation, but it will worsen its characteristics, so abused by this method is not necessary.

1. concrete hardening. This phase lasts for a long time, due to the progressive hydration of the concrete foundation components gaining strength for years.The first 28 days - this is a mandatory aging period of concrete to set them strength corresponding to its mark.Curing takes place fairly rapidly during the first day, then it slows down the speed.
2. In the first hours after the setting of concrete hardness is still low, and the addition of the next portion of the concrete may result in microcracks due to the load increase.After three days of hardening, generally, these loads do not have such an impact on the first layers of concrete.

Based on the characteristics of concrete maturing, we can say: pour the foundation parts as possible.In this case you need to follow some rules:

• The sequential mixing concrete between their parties during pouring into the mold should not exceed 2 hours in a warm weather, and 4:00 in the offseason.Seam is not formed, it does not change the strength of the foundation.
• If you want to make a long break in the work, it should be at least 2-3 days.After the break the surface of the foundation on which a fresh batch of concrete will be filled, must be cleaned of dust, moisture, and clean with a wire brush.The seam in this case will have a good grip.
• When pouring the foundation is often necessary to observe all recommendations for reinforcement.