Arranging a permanent place for a car is not just a matter of comfort, but also a necessary measure to preserve the technical condition of the vehicle. Mud, puddles and vegetation under the bottom accelerate corrosion, and regular exits from the lawn to the asphalt destroy the suspension. Concrete playground The machine is one of the most durable and practical solutions available for implementation on their own without the involvement of heavy machinery.
Unlike crushed stone, which requires constant filling and alignment, or pavement tiles, which have many joints, monolithic concrete creates a perfectly flat and sealed surface. It withstands considerable loads, is not afraid of temperature changes and the effects of aggressive liquids, such as: antifreeze Or motor oil. However, in order for the foundation to last decades, and not crack after the first winter, it is necessary to strictly observe the technology of soil preparation and the use of the soil. reinforcement Concrete.
The process of creating a parking space requires careful planning, from the choice of a place to finishing the surface treatment. Mistakes made during the excavation or mark selection stage slurryIt will be almost impossible or extremely expensive to fix after freezing. In this article, we will discuss all the stages of construction in detail so that you can get a professional result.
Selection of location and preliminary calculations
The first stage is always the determination of the geometry of the future structure and soil analysis. The standard size of parking space for one passenger car is 2.5 meters wide and 5-6 meters long. However, for ease of opening doors and maintenance, it is recommended to increase the width to 3 meters, and the length to 6-7 meters, so that there is a possibility of a check-in with a margin.
It is critical to assess groundwater levels and soil type. If the site clay soil, which does not pass water well, or the water level is high, a deeper excavation of the soil and reinforced water will be required. drainage. Ignoring this factor will cause the frozen water to swell the plate in winter and it will lose its geometry.
The material shall be calculated according to the expected load. For passenger cars, the optimal thickness of a concrete slab is 10-12 cm, but if you plan to park a heavy SUV or minibus, the thickness should be increased to 15 cm. It is also necessary to lay a margin of 10% on losses during transportation and leveling of the mixture.
Required tools and materials
The quality of the final result depends on the materials used. The basis is the concrete of the brand no lower M300 (B22.5)which provides the necessary compressive strength. The use of lower grades, such as the M100 or M150, is only permissible for pedestrian paths, but not for areas experiencing dynamic loads from the wheels of the car.
For reinforcement, a welded mesh with a cell of 100x100 mm or 150x150 mm and a rod diameter of 4-6 mm is most often used. In some cases, with weak soils, a volumetric frame of fittings with a diameter of 8-10 mm is used. Geotextile will also be needed to separate the layers and prevent the rubble from mixing with the soil.
- ๐ ๏ธ Tools: bayonet and sow shovels, vibrotrambovka (manual or mechanical), concrete mixer, rule (2-3 meters), craftsmen, pegs and construction cord.
- ๐งฑ Materials: cement, sand (quarry or river), crushed stone (fraction 20-40 mm), formwork board (25-40 mm), polyethylene film, reinforcement mesh.
- ๐ Measurements: Roulette, hydro level or laser level, building level.
You should not save on the formwork boards. A thin board may not withstand the pressure of the concrete mixture and deform, which will lead to curvature of the edges of the site. It is better to use a trimmed board with a thickness of at least 30 mm or moisture-resistant plywood.
Base preparation and excavation
Work should begin with the marking of the territory. On the perimeter of the future site, pegs are driven, and the cord is stretched. It is important to add 10 cm on each side to install the formwork. After marking, the top fertile soil (soil) is removed. The depth of the notch depends on the thickness of all layers of the pie: usually 20-30 cm under the rubble and 10-15 cm under the concrete itself.
If you plan to park a heavy SUV, the depth of the pit should be increased by 5-10 cm for an additional sand cushion.
The bottom of the obtained pit must be carefully tampered. If the soil is loose, it should be poured with water and compacted with vibrating. A layer of geotextiles is laid at the bottom, which will prevent weeds from germinating and rubble from mixing with the ground. The edges of the canvas should go to the walls of the pit.
Then a pillow of rubble is formed. The thickness of the layer of crushed stone should be 10-15 cm. The gravel is also levelled and thoroughly trampled. This layer performs the function of drainage and distributes the load from the concrete slab to the ground. A layer of sand 5-10 cm thick is poured over the rubble, which is shed with water for maximum shrinkage and alignment.
โ ๏ธ Attention: If the sand cushion is not tamped properly, in the future, under the weight of the car, concrete may subside in certain places, which will lead to the formation of cracks.
Installation of formwork and waterproofing
The formwork is the form into which the concrete is poured. It must be rigid and sealed. Boards are installed along the perimeter of the marked area and fixed with pegs from the outside. Pegs step - 50-70 cm. The inside of the boards should be wrapped with polyethylene or lubricated with waste oil so that the concrete does not stick to the tree and the edges turn out smooth.
To ensure waterproofing and prevent moisture from the solution to dry soil, a dense polyethylene film (at least 150 ฮผm thick) is spread on a sand cushion. The canvases are laid overhead for 15-20 cm. The film performs a double function: it prevents the cement "milk" from going into the ground, ensuring the correct hardening of concrete, and serves as a barrier to capillary moisture.
โ๏ธ Pre-reinforcement check
It is important to consider the temperature stitches. If the area is long (more than 4-5 meters), it is recommended to divide it with transverse slats, which after solidification of the concrete can be removed or left as deformation seams. This will prevent chaotic cracking of the fabric at temperature expansions.
Concrete reinforcement and pouring
Reinforcement is the skeleton of your site. The grid is laid on special plastic fixers ("chairs") or small stones so that it is in the thickness of concrete, and not lying on the ground. The optimal position of the grid is 1/3 of the height from the bottom of the plate (about 3-4 cm from the film). If you lay the rebar directly on the ground, it will not work on stretching and quickly rust.
Concrete solution is prepared in a ratio of 1:3:4 (cement: sand: crushed stone). Water is added to the consistency of thick sour cream. Too liquid solution will lose strength, and too dry is difficult to evenly distribute and compact. It is better to make pouring in one step to avoid the formation of "cold seams" - places where the old concrete has already grasped, and the new one has not yet frozen, which creates a line of weakening.
| Component | Proportion(s) | Function in a mixture | Quality requirements |
|---|---|---|---|
| Cement | 1 | Binder | M400 or M500 brand, fresh, no lumps |
| Sand | 3 | The filler, fills the voids. | Clean, no clay and no garbage. |
| Crushing | 4 | Carrying frame, strength | Granite, 20-40 mm fraction |
| Water. | ~0.5 | Activation of the reaction | Clean, technical. |
After unloading the concrete, it must be leveled with the rule, relying on the sides of the formwork. Then, vibration (buckling) is performed to remove air bubbles. The surface is smoothed by the master. To create a slope for water flow (1-2 cm per 1 meter), you can set beacons on formwork in advance.
How do you order ready-made concrete?
If the volume of work is large (more than 2-3 cubes), it is more profitable to order a mixer. Make sure that the access roads can withstand the weight of the loaded car (about 20-25 tons). Adjust the feeding time in advance, as the concrete begins to grasp 45-60 minutes after kneading.
Concrete care and finishing
The process of gaining strength with concrete lasts 28 days, but the first 7-10 days are critical. In hot weather, the surface should be regularly moistened and covered with a plastic film to prevent moisture evaporation too quickly. If the concrete dries, it will not gain the declared strength and will be covered with a network of microcracks.
You can remove formwork after 5-7 days, when the concrete will gain about 50-70% strength. Full load (car arrival) can be given no earlier than in 14-21 days, depending on weather conditions. To extend the service life and protection from oils and reagents, it is recommended to treat the surface reinforcement (topping) or a special varnish for concrete.
โ ๏ธ Please note: Do not use chloride-based deicing agents during the first winter of operation. They can damage the structure of young concrete. Use sand or granite crumb.
The main secret of the durability of the concrete platform is not so much the brand of concrete as the high-quality sealing of the base and proper care (moisturization) in the first week after pouring.
Possible Mistakes and How to Avoid Them
One of the most common mistakes is saving on rebars. Some owners of the plots believe that a thick layer of concrete (15-20 cm) without a net will withstand the car. This is a misconception: concrete works great for compression, but bad for bending. Without reinforcement, uneven subsidence of the soil is guaranteed to lead to the breakage of the plate.
Another mistake is the lack of compensation stitches. Concrete expands and narrows as the temperature changes. If a large monolithic field is filled without ruptures, the internal stress will break it at its weakest point. Be sure to make cross-cutting or seams every 3-4 meters.
- ๐ซ Mistake: Pouring on frozen ground. Consequences: Spring buds will raise the plate. The solution: remove the fertile layer to a non-freezing depth or make a high-quality pillow.
- ๐ซ Mistake: Use of sea sand without washing. Consequences: salt in the sand will cause corrosion of the reinforcement and destruction of concrete. Solution: Use only quarry or washed river sand.
- ๐ซ Mistake: Ignoring the bias. Consequences: the formation of puddles, which in winter turn into ice humps, dangerous for cars. Solution: make a slope of at least 1.5-2% in one direction.
Compliance with technology will allow you to create a parking space that will last 20-30 years without major repairs. A concrete pad is an investment in the safety of your car and the aesthetic appearance of the site.
What thickness should be a concrete platform for a passenger car?
The optimal thickness of concrete slab for passenger cars is 10-12 cm, provided that there is a high-quality reinforcement with a grid. If the ground is pulpy or it is planned to park heavy SUVs, the thickness should be increased to 15 cm.
Do I need to re-arm the car for the car?
Yes, reinforcement is a mandatory stage. Concrete is fragile on a kink, and without a metal frame (rebar mesh), any uneven load or ground movement will lead to cracks. The grid distributes the load throughout the plate area, working as a single unit.
How many days after the pouring can I come to the site?
Full operating load (car arrival) can be given 21-28 days after filling. It is during this period that concrete gains 100% of its design strength. Early arrival (after 3-5 days) is possible only for special equipment when caring for the surface, but the weight of the car is a young coating can not withstand.
What if the concrete cracks?
Microcracks (hair) up to 0.3 mm are not dangerous for the structure. Larger cracks must be embroidered (expanded), cleaned of dust and sealed with a repair composition based on epoxy resins or cement solution with the addition of PVA glue for elasticity. If the crack is through and the stove is walking, an injection or complete alteration of the site may be required.