Bentonite

A mixture of water and bentonite. Bentonite is a kind of absorbent clay formed by breakdown of volcanic ash.

No finish

No material has been used. The hole may have filled naturally with material that came from the hole or originated from the ground level.

Gravel

Gravel that has been sieved and consist of grains with a size between 2 and 6.3 mm.

Gravelly sand

A mixture of sand and gravel that has been sieved and consisting of grains with sizes ranging from 63 µm to 6.3 mm.

Coarse gravelly sand

A mixture of sand and gravel that has been sieved and consisting of grains with sizes ranging from 0.63 to 6.3 mm.

Unscreened gravelly sand

A mixture of sand and gravel that has not been sieved. This category includes material referred to by terms as masonry sand and filler sand.

Grout

A mixture of cement and water without addition of other materials.

Bentonite grout

A mixture of cement and water where bentonite is added.

Clay swell class 1

Grains composed of clay with a swelling capacity of at least 80% in salt water (NaCl 10,000 mg/l) and with a permeability that is less than 10-9 m/s. No detectable substance is added to this material. The material is comparable to Mikolit-B and is used under conditions that place high demands on the water retaining capacity.

Clay swell class 1 detectable

Grains composed of clay with a swelling capacity of at least 80% in salt water (NaCl 10,000 mg/l) and with a permeability that is less than 10-9 m/s. A detectable substance is added to this material. The material is comparable to Mikolit-B and is used under conditions that place high demands on the water retaining capacity.

Clay swell class 2

Grains composed of clay with a swelling capacity of at least 30% in salt water (NaCl 10,000 mg/l) and with a permeability that is less than 10-9 m/s. No detectable substance is added to this material. The material is comparable to Mikolit-300 and is used under conditions that place standard demands on the water retaining capacity.

Clay swell class 2 detectable

Grains composed of clay with a swelling capacity of at least 30% in salt water (NaCl 10,000 mg/l) and with a permeability that is less than 10-9 m/s. A detectable substance is added to this material. The material is comparable to Mikolit-300 and is used under conditions that place standard demands on the water retaining capacity.

Clay swell class 3

Grains composed of clay with a swelling capacity of at least 30% in demi water and with a permeability that is less than 10-9 m/s. No detectable substance is added to this material. The material is comparable to Mikolit-00 and is used under conditions that place low demands on the water retaining capacity.

Clay swell class 3 detectable

Grains composed of clay with a swelling capacity of at least 30% in demi water and with a permeability that is less than 10-9 m/s. A detectable substance is added to this material. The material is comparable to Mikolit-00 and is used under conditions that place low demands on the water retaining capacity.

Clay swell class unknown

Grains composed of clay with an unknown swelling capacity. No detectable substance is added to this material.

Clay swell class unknown detectable

Grains composed of clay with an unknown swelling capacity. A detectable substance is added to this material.

Removed material/outcoming soil

The hole was filled with the drilled or excavated soil.

Road surfacing material/asphalt concrete

Material used for paving roads and yards. Examples include asphalt, concrete clinkers, crushed clinker stone and tiles.

Sand

Sieved sand that consist of grains ranging in size from 63 µm to 2 mm.

Medium coarse sand

Sieved sand that consist of grains ranging in size from 0.2 µm to 0.63 mm.

Coarse sand

Sieved sand that consist of grains ranging in size from 0.2 µm to 2 mm.

Very coarse sand

Sieved sand that consist of grains ranging in size from 0.63 µm to 2 mm.

References

• BRO-Catalogus Geologisch booronderzoek versie 0.99 – 25 maart 2020