Kerakoll Ghiaia 3.6 washed aggregate gravel for cast geo-mortars (3–6 mm)

A pour thicker than 60 mm? At that point, you need fine concrete rather than mortar. Gravel makes it fine concrete: washed, graded, 3–6 mm. This is Kerakoll Ghiaia 3.6, the aggregate gravel for Geolite and Metric poured mortars, as well as Geocalce lime screed.

• Layer thickness over 60 mm: 25–40% gravel by weight relative to the powder — the aggregate skeleton is adjusted to the pouring thickness, reducing the heat of hydration
• Part of the system: Geolite Magma, Geolite Magma 20 and Metric Track poured mortars — the manufacturer prescribes aggregate gravel for these products
• Lime screed and concrete subfloor: 100 kg Geocalce G Antisismico + 25 kg Ghiaia 3.6 + 13 l of water — factory formula, applied using a compactor
• Concrete mixer, pump mixer: excellent mixability — can be worked without difficulty until a homogeneous mix is obtained
• Do not let it separate from old concrete: excellent adhesion to hydraulic binders — washed, graded gravel, free of impurities, is added to the mix
• Large pours, pallet quantities: 25 kg bag, 1,500 kg/pallet (60 bags) — unlimited storage life, the remainder does not expire
• Does not build on its own: without a binder, it is only gravel — together with Geolite Magma or Geocalce G Antisismico powder, it produces fine concrete

What is it suitable for?

Kerakoll poured mortars in thick layers:

• Geolite Magma, Geolite Magma 20, Metric Track — for layer thicknesses over 60 mm, mixed in at 25–40% by weight
• Geocalce G Antisismico — screed and concrete mix according to the manufacturer's formula (100 kg + 25 kg)

Applications:

• Filling of industrial floors and smooth concrete surfaces between 60–100 mm, deep cross-section restoration
• Lime screed, structural subfloor, substrate for bonded coverings, road and concrete surface repairs
• Flowable and self-compacting fine concrete according to EN 1504-3

Not suitable for:

• As a standalone material, without a binder — not a ready-to-use product and not a surface suitable for covering
• For layer thicknesses under 60 mm — the data sheet prescribes gravel only above this thickness
• For plaster, tile adhesive and floor levelling compound where the TDS does not prescribe it
• For a 6–10 mm aggregate skeleton — the former Kerabuild Ghiaia range cannot be replaced with this product

Geolite / Geocalce system — mixing ratios

The amount of water for Geolite and Metric products must be dosed according to the value indicated on the respective bag and technical data sheet.

Frequently asked questions

What should be done when pouring a layer thicker than 60 mm?

Gravel must be mixed into the mortar. Add 25–40% aggregate gravel by weight to the cast mortars Geolite Magma and Metric Track. This produces fine concrete with lower heat of hydration.

Which gravel is needed for concrete repair mortar?

Washed, graded 3–6 mm gravel, in accordance with EN 12620. Kerakoll specifies Ghiaia 3.6 for this purpose. Washed, graded material provides a known particle size distribution - this is the essence of EN 12620.

How much gravel is needed for 100 kg of mortar?

25–40 kg, or 1–1.6 bags. The technical data sheets for Geolite Magma, Geolite Magma 20 and Metric Track all specify 25–40% by weight. The exact ratio depends on the layer thickness.

How is a lime screed made with Geocalce?

100 kg Geocalce G Antisismico + 25 kg aggregate gravel + 13 l water. This is the manufacturer's screed recipe and can be installed using a compactor. For a concrete-consistency mix, use 15 l of water and a vibrator.

What does EN 12620 mean?

EN 12620 is the European standard for aggregates used in concrete. It specifies particle size distribution, cleanliness and durability. Ghiaia 3.6 is washed gravel that complies with it.

When is aggregate gravel NOT needed in the mortar?

Not for layer thicknesses under 60 mm. The technical data sheet requires gravel only for layers over 60 mm. It is also not suitable for plaster, adhesive or screed levelling compounds.

Can it be purchased separately?

Yes, it can also be ordered separately in bags. It is useful when the mortar is already available or when gravel needs to be added afterwards due to a thicker layer. Packaging: 25 kg bag, 60 bags per pallet.

Can I mix it myself?

Yes, in a concrete mixer or a pump mixer. Mix until homogeneous, following the manufacturer's ratios. The product is intended for professionals - we also undertake the installation for larger pours.

Is it the same as the old Kerabuild Ghiaia?

No. Kerabuild Ghiaia was 6–10 mm gravel, while Ghiaia 3.6 has a 3–6 mm particle size distribution. The finer aggregate was designed for the cast mortars Geolite Magma and Metric Track, as well as the Geocalce G Antisismico screed mix.

How long can it be stored?

For an unlimited period in the original bag. The gravel does not set or expire. Any unopened bags can be used on the next project.