SlovenščinaCatalogue of Slovene clays

sample15Bobovek · Upper Carniola

46.276314 14.361031

Collected by Ana Ida

Flooded Clay Pits of Brickworks Bobovek – Bobovek · Upper Carniola
Flooded Clay Pits of Brickworks Bobovek
Photo from the web

Bobovek

The excavation of clay, which was exploited by the Bobovek brickworks, began in 1905. Its owner was Zabret, a local known also as Čuk (Little Owl) and therefore, the cave that was at that time formed by the excavation of clay is still called Čukova jama (Little Owl cave). After the Second World War, another cave was excavated that acquired an interesting name Krokodilnica, although there were never any crocodiles in the area. Children used to slide down these slopes and because they had green pants, they were told that they were green like crocodiles; hence the name Krokodilnica. Ledvička (Kidney) got its name from its shape. Several years after the war, the brickworks was nationalized, whereas it ceased to function in 1971.

Sample 15 is clay from Bobovek (Upper Carniola). The recommended firing temperature is 900–1150 °C. The beginning of sintering is at 1150–1200 °C. At 1200 °C shrinkage is 17 % and porosity 1 %.

Clay samples

  1. Sample 15 – 800 °C800 °C
  2. Sample 15 – 900 °C900 °C
  3. Sample 15 – 1000 °C1000 °C
  4. Sample 15 – 1100 °C1100 °C
  5. Sample 15 – 1200 °C1200 °C
segrevanjeheating uppriporočena temp. žganjarecommended firing temperatureszačetek sintranjathe beginning of sinteringmehčanjesofteningžganje/firing °C%%00224466881010121214141616181820202222suha glina/dry clay900 °C1000 °C1100 °C1200 °C1300 °C
  • segrevanje
    heating up
  • priporočena temp. žganja
    recommended firing temperatures
  • začetek sintranja
    the beginning of sintering
  • mehčanje
    softening
%048121620suhadry9001000110012001300°C
poroznost/porosity %skrčki/shrinkage %

Clay preparation for testing

  1. unprocessed clayunprocessed clay
  2. sifted and dried claysifted and dried clay
  3. 012341.00.20.05%grain size in mm
  4. 1.8 % = 1.0 mm1.8 % = 1.0 mm
  5. 1 % = 0.2 mm1 % = 0.2 mm
  6. 0.1 % = 0.05 mm0.1 % = 0.05 mm