16 Jul Pouring concrete floors
During the construction of a building, the pouring of concrete floors requires a study of the bearing capacity of the foundation, as well as the presence of groundwater. Often, this data can be obtained from geological maps where construction is being carried out.
Also, it should be remembered that soil assessment should be carried out by specialized research institutes or specialized firms. After the received data are processed, a design solution for the floor structure made of concrete is issued. It usually takes into account the thickness and grade of concrete, expansion joints, reinforcement scheme, etc. d.
Pouring concrete floors involves the calculation of the expected temperature, chemical and mechanical loads. The construction site must be looked at by a specialist for a visual assessment of the construction site, taking into account the foundation, access roads, etc. d.
As a rule, concrete floors are laid, starting with the leveling of the base. For this purpose, laser and optical devices are used. Before direct pouring of concrete, to prevent the occurrence of cracks or subsidence of the base itself, it is necessary to compact the soil.
The next stage of surface preparation is laying a sand cushion with a thickness of 0.5 to 1 meter. This layer must be compacted.
Concrete screed is made with rectangles (cards). Wooden boards with a thickness of more than two centimeters are used as formwork. Then fittings are installed.
The pouring of concrete floors assumes that with the help of special concrete mixer trucks, the delivery of concrete will be organized. The material should be fed as close as possible to the laying point itself.
In the event that the floor is not poured on the 1st floor, it is necessary to use a concrete pump. When laying such a floor, the concrete must be leveled with a vibrating screed. Its principle of operation is quite simple: a vibrating screed is installed on the poured concrete and moves along the surface, under the parallel influence of vibration, fresh concrete settles to the required level.
At the end of the laying process, a technical break is made, the duration of which is 3-7 hours. At the end of the break, the concrete manages to obtain sufficient strength and the surface grout begins.
This procedure is performed using smoothing machines that are equipped with a freely rotating shocking circle. After using a machine with floating blades, a rough grout is performed of the entire surface. This procedure to give greater smoothness of the floor is performed 2 times.
After performing the above procedures, it is necessary to process seams that are 3 types: structural, shrinkage and isolation. All seams are filled with sealants from polyurethane. This approach prevents dirt and moisture.
As you can see, pouring concrete floors is an extremely complex and laborious process that it is better to perform specialists with skills and construction equipment.