When preparing for the construction of a capital structure, masters often ask themselves: is it possible to fill the foundation with parts and what does it threaten with? An interest in such information arises, since filling material in the soil at one sitting in the pit requires considerable effort. Here you can not do without the operation of specialized equipment, which is required for mixing an impressive volume of solution. Let's find out whether it is possible to fill the foundation with parts under the house?
Accounting for time intervals when pouring concrete in parts
Before proceeding directly to the consideration of the question of whether it is possible to fill the foundation with parts, you need to pay attention to a number of important points regarding the pour time of concrete mixtures.
In total, two stages are distinguished here - the setting and hardening of the material. These processes have their own time intervals, which will be discussed later.
Setting time
To understand whether it is possible to fill the foundation with parts, it is necessary to talk about the features of the setting of the material. The specified process takes effect immediately after filling the formwork with concrete mixture. Curing involves the formation of stable bonds between the components of the solution.
The process takes an average of 3 hours, but only if the temperature of the surrounding space is above 15 ° C. As for the maximum setting time, in some cases it takes 24 hours or more, in particular, at subzero air temperatures .
Is it possible to fill the strip foundation in parts? It is allowed to resort to filling the pit with a new layer after passing about 8 hours after the start of the setting process. In this case, it is necessary to lay a not too thick layer of the solution. Otherwise, defects may occur in the foundation structure.
Hardening time
As noted above, the second stage in pouring the foundation is its hardening. Until complete, the process proceeds for a month. Only at the end of the specified period, concrete will become ready to exert any loads on its thickness. Such a slow hardening can be explained by the extremely limited access of air to the deep layers of the material.
Is it possible to fill the foundation with parts at the solidification stage? Putting pressure on a semi-liquid solution in the thickness of the foundation can lead to cracks on its dried walls. At the same time, some defects may be visually invisible. However, they will certainly make themselves felt after the completion of construction work. Therefore, pouring here must be done in small portions.
So, is it possible to fill the foundation in parts? This should be done only after qualitatively solidifying the previous layer. Moreover, before performing such actions, it is necessary to dry the surface of the material and clean it with a brush with a metal pile. Only after this, you can start pouring a new layer of the solution.
The use of plasticizers
Dense shrinkage of the solution when pouring the foundation contributes to the impact on its thickness by vibration. To avoid such work, plasticizers are added to the material. These substances increase the fluidity of the solution. Therefore, if they are used, the voids in the thickness of the material will fill by themselves. Such a solution, ultimately, will reduce the level of the destructive effect of the next portion of the solution on a relatively frozen base when pouring the foundation in layers.
Horizontal and vertical fill layers
Is it possible to fill the foundation for the bath in parts? It’s worth doing the work, resorting to the creation of vertical or horizontal layers.
When horizontally filling the formwork, the solution is poured into the prepared frame to half. Mandatory requirement - the height of the next layer of the solution should be higher or lower than the threads of the reinforcement, but not on the same line with the metal elements.
Vertical casting involves dividing the pit into sections using stable partitions. So that under the weight of the solution the formwork walls are not damaged, with this method it is worth creating sectors that are insignificant in area.
Methods of pouring the foundation in parts
Is it possible to fill the foundation with parts with reinforcement? There are several ways to do this:
- "Hot seam" - the method is relevant if the next layer of the solution is planned to be laid in less than 12 hours. In this case, after pouring the first portion of the material, its surface must be covered with roofing material or a plastic film. Thus, the concrete is compacted, but a dense crust does not have time to form on its surface.
- "Cold seam" - the method is used when the time interval between laying the next layer is more than 12 hours. In this case, it is important to wait until the already poured mass of the solution has completely hardened. If only an unstable crust has formed on its surface, the latter may not withstand pressure during pouring, which will lead to the most unforeseen consequences during the operation of the foundation.
Useful Tips
When resorting to pouring the foundation in parts, it is worth paying attention to several points. First of all, you need to think through each stage of work in advance. It is recommended to divide the entire area of the prepared pit into sectors. In addition, it is important to timely prepare the volume of solution necessary to fill a particular area.
Concrete should be poured evenly over the entire area of the sector. When laying the material using the “cold seam” method, it is always necessary to remove the cement film that has formed on the concrete surface, since it prevents the adhesion of the layers of the mortar. You can remove it with a metal brush or hammer.
Finally, it is worth noting that when performing work in the cold season, the surface of the hardened layer must first be cleaned of ice and snow.
Finally
As you can see, pouring the foundation with concrete mortar in parts is quite realistic. In some cases, it is simply impossible to avoid such an approach to performing work, in particular, in the absence of access to specialized equipment, which makes it possible to prepare material in large quantities.
Filling in parts saves the budget, effort and time. In addition, layer-by-layer solidification of the material makes it possible to make the foundation as strong as possible, since in this case there is better hardening of the solution in the formwork sectors. The main thing is to follow certain rules during the work and not deviate from the time intervals between the stages of pouring.