Order now Andesite Cobblestone and Andesite Kerbstone for durable and stylish exterior paving!
Usages:
Natural stone kerbstones are used to:
- define access routes
- enclose specific surfaces
- define the limits of roadways and walkways
- define and enclose roads, car parks, etc.
Features:
Porphyry is a volcanic rock, similar to granite. However, granite results from slow cooling of deep magma, while porphyry occurs by erupted magma onto the surface, which is quickly crystallized afterwards. Porphyry is a stone with extended durability to extreme weather, freeze-thaw cycles, plus corrosion resistance and abrasion hardness. Just like andesite and granite kerbstone, porphyry kerbstones are highly recommended as containing elements for the roadway to prevent 'spreading' and loss of structural integrity.
Technical features:
- density: 2 420 kg/m³
- hardness (Mohs scale): 6
- water absorption (normal conditions): 2.3 %
- mechanical strength (compression): 127 MPa
- mechanical strength (bending): 8.4 MPa
- abrasion resistance: high
- fire rating: class A1 (non-flammable)
Rosso Italia (Porphyry) Andesite Kerbstone have standard size (W x L x H): 10 x 15 x 50 cm and 25 x 20 x 50 cm.
Both models have sawn cut finish and one bevelled edge. Rosso Italia Andesite Kerbstone are produced in our manufacturing facility and are available at fair prices. We can deliver custom size kerbstones and processed edges, anywhere in Romania and all over Europe.
How to lay out kerbstones?
Stone kerbstones are laid out on a concrete bed (semi dry screed) with gravel support or on gravel bed, without concrete. If you want to lay them out by yourself, just follow the next steps:
Kerbstone laid out on concrete bed (semi dry screed):
1. preliminary preparation: carefully inspect the areas before digging, to avoid damaging the utility routes
2. surface cleaning: remove any debris of plant, 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 (crushed stone), then compact it by hand or use a vibratory plate compactor for this
5. cast-in-place concrete: a layer of approx. 10 cm
6. laying the kerbstone: on fresh concrete up to a depth of 5 cm. Then, adjust it to line and level with fresh concrete.
Lay out kerbstones on a gravel bed – recommended for kerbstones up to 20 cm height, garden alleys and separation of green areas, etc. This is not recommended for heavy traffic areas.
1. repeat the already mentioned steps, from 1 to 3
4. use color flags and strings for flagging and marking the areas. You can use 2 strings for flagging the trench edges (preferably for curved surfaces) or a single string and dig next to it. The string must have the same height as the kerbstone.
5. trench digging: the trench depth is determined by adding the kerbstone height to the length above ground level, plus the gravel thickness that is laid out in the trench.
E. g.: for 20 cm height Rosso Italia (Porphyry) Andesite Kerbstone we have: 20 cm + 8 cm (the kerbstone height above the ground level) + 5 cm = 33 cm trench depth. The width should be approx. 30 cm (kerbstone width = 25 cm), to allow compaction by hand. The ditch is shoveled/excavated with perfectly straight walls and perfectly flat bottom.
6. fill out the trench with gravel/sand, then compact it
7. lay the kerbstone, then adjust its height with a rubber mallet
8. fill out the empty space around the kerbstone with excavated soil, then compact it
9. fill out the joints with soil, sand or mortar
Preliminary calculations:
How to calculate the necessary kerbstone for a backyard alley with given size
For determining the figure, divide the needed length by the kerbstone length
E. g.: for defining a 15 m (1 500 cm) long driveway, you will need 1500:50 = 30 Rosso Italia (Porphyr) Andesite Kerbstone, 50 x 25 x 20 cm size.
How to calculate the necessary gravel to be laid out in the ditch:
Calculate the necessary volume with the formula follows V = L x l x h, in which:
L = trench length (15 m, in our example)
l = trench width – for estimation, take into account the size of a manual compactor (approximately 20 cm), but we will set aside 25 cm because you should be able to access the trench with the compactor
h = the height of the gravel layer for this kerbstone, according to step 4 from the installation procedure (10 cm)
For our example we have the following dimensions, expressed in meters (m):
V = 15 x 0.25 x 0.1 = 0.375 m³
the necessary gravel is calculated with the standard density formula (e. g. gravel of 7-16 mm, with ρ = 1550 kg/m³)
ρ = m/V => m = ρ x V, and in terms of figures
m = 1550 x 0.375 = 581 kg gravel, grain size of 7-16 mm
Invest in Rosso Italia (Porphyry) Andesite Kerbstone exterior pavings and kerbstones, for streets, roads and alleys, manufactured with high-quality standards.
