Efficiency of calcium carbonate oven stones

Anne Di Piazza

20 citations0/0 files storedArchaeology in Oceania/Archæology & physical anthropology in Oceania

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Pacific and Southeast Asian Studies Archaeology and ancient environmental studies Archaeological and Geological Studies

Abstract

Abstract This paper is an attempt to better understand the use of earth ovens on atolls. A study was make linking ethnographic records of calcareous oven stones with an experiment which replicated the chemical conditions within an earth oven. It appears that calcium carbonate (CaCO3) dissociates to quicklime (CaO) during heating and hydrates to slaked lime (Ca(OH)2) during cooking. This reaction, shown to have occurred in archaeological sites, can liberate more heat in the oven than volcanic stones. This suggests that calcareous material makes better oven stones than previously thought.

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References

2002Encyclopedia of Science and Technology 2009Life In The Southern Isles: Or Scenes And Incidents In The South Pacific And New Guinea 1971Archaeology on Nukuoro Atoll: a Polynesian outlier in the eastern Caroline Islands

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