Kerbstones Outdoor Paving | Anthracite Granite Kerbstone - Best Price!
Buy now kerbstone for outdoor paving made of granite cobblestone or granite tiles. We can produce any kerbstone you want with anthracite granite, to be used for durable road and streets! Granite is an igneous rock formed by slow cooling of deep-sea magmas. Anthracite granite is very durable against any kind of weather (freeze-thaw cycles, acid rain, strong wind, etc.), staining agents (including corrosive), plus heavy traffic. PIATRAONLINE is a granite kerbstone manufacturer with over 12 years of experience, and significant benefits for customers. Anthracite granite kerbstones features include sawn-cut finish, 1L bevelled, processed with superior cutting technology. The product is recommended as granite urban kerbstone and as large kerbstone for alleys and streets. This granite kerbstone can be combined with anthracite granite cobblestone for durable road and street construction!
Usage:
separation line between footway and carriageway
in parks, gardens and squares
adding strength to the side of road pavement
markers for access routes
separation marks for parking spaces
The product is highly recommended as granite urban kerbstone and large kerbstone for pedestrian walkways and streets.
Features: Granite is an igneous rock formed by slow cooling of deep-sea magmas. It is very durable against any kind of weather (freeze-thaw cycles, acid rain, strong wind, etc.), staining agents (including corrosive), plus heavy traffic. Here are only some of the physical properties for anthracite granite:
- density: 2 650 kg/m³
- hardness (Mohs scale): 6.5
- water absorption (normal conditions): 0.3%
- mechanical strength (compression): 152 MPa
- mechanical strength (bending): 15 MPa
- abrasion resistance: high
- fire rating: class A1 (non-flammable)
Anthracite granite kerbstone standard size: (W x L x H): 10 x 15 x 50 cm and 25 x 20 x 50 cm. Both versions feature sawn-cut finish, and distinct edge processing (bevelled 1L). PIATRAONLINE offers natural stone street kerbstone for your projects with custom size and edge processing, produced with the state-of-the-art technology.
Everything you need to know about the installation kerbstones:
Kerbstones are laid out on a concrete underlay (semi dry screed) with gravel support or gravel bed without concrete.
Installation of granite kerbstone on concrete bed (semi dry screed)
1. preliminary preparation: double check the areas before you dig, because you want to avoid any damage to the utility routes
2. surface cleaning: remove any plant debris, stones or tree trunks
3. soil excavation: dig a trench of about 25 cm deep
4. laying out the gravel: lay out approx. 10 cm of gravel and compact this by hand or mechanically.
5. laying out the concrete: a layer of about 10 cm thick
6. laying out the kerbstone: embed the kerbstone within the concrete layer, up to a depth of 5 cm. Add concrete to the back of the kerbstone for fixing.
Installation over a gravel bed - recommended for kerbstones with up to 20 cm height, garden alleys and separation of green areas, etc. This is not recommended for heavy traffic areas.
1. repeat the steps 1 to 3 from the previous instructions
4. mark area and draw lines. You can use 2 strings for highlights the trench edges (preferably for the curve areas) or a single string, and dig next to it. The string height must correspond with the kerbstone’s.
5. trench digging: calculate the depth by adding the kerbstone’s height to the height above the surface and the thickness of the gravel that is laid out in the trench.
E.g.: for 20 cm height anthracite grey granite kerbstone we have: 20 cm + 8 cm (the kerbstone height that protrudes out the surface) + 5 cm = 33 cm trench depth The width will be about 30 cm (kerbstone width = 25 cm) so that it’s possible to compact the soil by hand. The ditch is shovelled/excavated and must have straight walls and a smooth bottom.
6. fill out the trench with gravel/sand and compact it
7. lay out the kerbstone, then adjust the height with a rubber mallet
8. fill out the empty space around the kerbstone with excavated soil, then compact it
9. fill the joints with soil, sand or mortar
Preliminary calculations:
How to calculate the necessary kerbstone for a backyard alley with given size
Divide the necessary length by the kerbstone length and you obtain the number of kerbstone to be ordered.
E.g.: for a 15 m (1500 cm) long driveway, 1500:50 = 30 Anthracite Grey 25 x 20 x 50 cm kerbstones.
How to calculate the necessary gravel to be laid out in the ditch:
Calculate the necessary volume, as follows V = L x l x h, in which:
L = trench length (15 m, in our example)
l = trench width, for estimation consider the size of a manual compactor with vibrating plate (approximately 20 cm), but we need 25 cm because we should be able to penetrate the trench with the compactor
h = the height of the gravel layer for this kerbstone, as shown in step 4 of the installation procedure (10 cm)
Expressed in meters (m), in our example we have:
V = 15 x 0.25 x 0.1 = 0.375 m³
calculate the necessary gravel with the standard density formula (e.g. gravel 7-16 mm, with ρ = 1550 kg/m³)
ρ = m/V => m = ρ x V, in figures
m = 1550 x 0.37
