Abstract
The Onoda Bottle Kiln completed in Meiji era and preserved in Taiheiyo Cement Corporation in Onoda city (former Onoda Cement Corporation) were repaired some times. This paper deals with the transition of quality of fired clay bricks according to every refurbishment. For clarifying the physical properties of bricks, some material testing were carried out, namely a uniaxial compression test, measurements of density and water absorption, the presumption of manufacturing temperature by re-burning of bricks, measurements of moisture movements, porosity and etc. As the production time goes on, the compressive strength was increased, the density became higher, the characteristics against freeze and thaw was not enough but improved, the porosity volume decreased, and the moisture movements were stable and decreased. The potential internal defect was suggested in the brick by press molding. The production temperature is assumed 1150℃ in the brick by cast molding, 1050℃ by press molding , 1250℃ by extrusion molding. Especially the movements of the newest bricks produced by extrusion molding are prominent.
