Parking on heaving soils - Epps under a concrete slab or paving

For heaving soils, there are several technologies of tracks and parking lots so lovingly laid in autumn tile or slab cast in the spring is not twisted or not smashed. With the advent of materials such as geotextiles and Epps, a real opportunity to neutralize the impact forces of frost heaving, and avoid the need for regular alteration. Craftsmen FORUMHOUSE choose modern technology, which is what all desire.

What threatens frost heave

Swelling property called soil increase significantly in volume during the freezing of moisture contained therein. Although this phenomenon is strongly influenced by the water table (groundwater level), to a greater extent it depends on the composition of the soil. Even shallow water table at the level of several meters, not in freezing ensures that the ground is not vspuchilis, since there is also a capillary rise.

Yury (User FORUMHOUSE):

Frost heave due both to GWL and the properties of the foundation soil. If the groundwater level in the freezing period is about 2-3 meters, it does not mean that the swelling will be gone. There is a process - the capillary rise of water. Furthermore, according to the theory of heat and mass, the water moves to the freezing front. Swelling occurs when the free water present in the soil (which is free) and a negative temperature. Hardest to heave in the soil affects dusty fraction. If the groundwater level in the period freezing carried high (0,3-0,5m), it will become swollen and crushed stone "cushion", and sand and gravel mixture, and any other base.

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Given that swells during freezing and during thawing sags such soil unevenly, massive monolithic structures erected thereon, will be deformed.

When laying the foundations there is a whole range of measures to build on the heaving soils without dire consequences. Some of this arsenal is claimed and the regeneration of the parking lots.

Parking with paving stones on heaving soils

By and large, the parking device with heaving paving stones on the basis of radically from a similar process for other reasons no different. One of the most important steps of - removal of topsoil to a solid mass, the more that the selected primer can be used.

Groundworkturf (FORUMHOUSE Moderator):

Plodorodka under pad is removed by definition, the cut portion plodorodkoy raise the level around the area / parking.

It is also necessary to give a bias to rainfall and melt water flowed in the direction of drainage wells, if any, or simply rapid removal from the site. Thus it is desirable to avoid excessive sample of the solid layer, as ruts will align with bedding sand rammer.

If we were talking about the soils which are not subject heave, the following steps would be: Sand bed (10 cm) and it pavers; Airbag sand, cement-sand mixture (5-7 cm) and has on its fixings; mesh reinforced concrete slab or a fiber (10 cm), plus fixings on the adhesive mixture.

On the heaving soils can not do without geotextile, drainage pads from the rubble, and our craftsmen are advised to use the technique of "UWB-ists", and include a layer of insulation.

Lyoshs(User FORUMHOUSE):

Another thing is that we've got swelling, water and so on, so the desired slope and bedding of the gravel area with the "blind area". You can do, for example:

• Geotextile (200 or 300 g / m²).
• Ramming gravel (fraction 20-40 mm).
• Epps (for reviews, 30 mm is enough, but I would put 50 mm).
• Sand (10 cm).
• Paving stone (for parking the sand 30 mm small thickness, it is necessary not less than 60 mm).

Geotextiles in the "cake" is used to rubble gradually drawn into the soil, and it retains its draining properties.

Another option for heaving soils - the use of geogrid, as advised Groundworkturf:

• Geotextiles.
• Sand bed - 5 cm.
• Volumetric geogrid - h 10 cm.
• Crushed - 12-15 cm (20-40 mm fraction).
• Crushed - 5 cm (Fraction 5-10 / 5-20 mm).

• Cement-sand mixture - 5-7 cm.
• Sett.

And Epps and geogrid provide "floating" foundation that will prevent parking / track / platform from strain when a finishing layer pavers or gravel.

But if it is planned under the paving stones of concrete "cushion" can not do without Epps.

Epps under a concrete slab on heaving soils

Such an embodiment is generally selected owners of houses and other structures on the site, erected on Swedish insulated plate, make it more effective. Using Epps makes it possible not only to prevent the impact forces of frost heaving on the stove, but also to reduce the thickness of the concrete.

IlyaIvanov (User FORUMHOUSE):

When building a house as a foundation, I prefer UWB and happy with my choice. The next season will upgrading the site and construction of the parking lot. I believe that laying the prepared Epps cushion layer of 50 mm and subsequent casting slab of 100 mm sensible than fill plate 150 mm. I understand that parking on the stove much stronger impact forces of frost heaving than the cars that are on it.

his theme IlyaIvanov opened to find out some details and to find out the views of practitioners, it was found that such a construction is quite viable. One of our skilled craftsmen with the nickname smyra and a blind area, and an access road on the basis Epps made 30 mm thick, stacked on a layer of sand 10 cm. According to the craftsmen, in the spring of 10-15 cm raises the fence posts, concreted at a depth of 1.2 meters, and the road and blind area in order. Warming of foundation and practice in the construction of public roads.

In the course of discussion of the topic cleared as follows:

• Gravity layer to the plates is not required - it is sufficient to withstand the tilt angle 3⁰.
• Preferably not samomesny concrete and custom, in an ideal - Class 22.5 (M300).
• You can not make an expansion joint, if the correct reinforcement and vintage concrete.
• Rodent insulation protects backfilling with gravel on the perimeter.
• The minimum thickness of concrete under the passenger car - 10 cm.
• The minimum protective layer for reinforcement may be reduced - with 4 to 3 cm, as Epps additionally protect from moisture.

Also, do not skimp on the upper reinforcement.

Mixail_Pl (User FORUMHOUSE):

Counted about (the soil under the slab accept as perfectly elastic) for one car in three and a half tons of weight. The lower layer of reinforcement - 8 mm, 400 A, mesh of 200x200 mm, the top layer - 6 mm, 400 A, mesh of 200x200 mm. The upper mesh was necessary, as the car four-wheel drive, in the plate there may be the bending moments of opposite signs. Plate thickness - 10 cm, in concrete 20.

It was argued that it is possible to use instead of iron reinforcement composite, microfiber and add to plate does not hurt. But this is a personal choice, from fiberglass weight of both supporters and opponents.

As they say, a shoemaker without shoes, that's topikstarter eventually decided to save on a heater, but do not advise anyone to repeat his experiment.

IlyaIvanov:

As the instigator I report - under the slab needs Epps. I will not put. Sand bed - 30 cm thick, by pouring and rammer; gravel - 15-17 cm layered tamper; concrete slab - 15 cm thick, with a mesh reinforcement 150 × 150 mm (eight). Sliced ​​expansion joints, placed along the perimeter of the drain pipe. Despite all raised corner of one plate of 1.5 cm, and the other cracked. The moral - do not save on Epps.

How to make sure our craftsman, is not in vain in the heaving soils insulated base, this makes it possible not only to reduce the layer of concrete and pour the whole plate, but also protects against deformation and cracking.

All the details - in the subject line "Epps under the concrete slab for parking"Of geogrid described in article about ekoparkovki. Garden paths and recreation areas can be tiled with less, how - in the material on a makeshift stove. In the video - an ecological park.

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