Graduate School of Science and Engineering Saitama University,
255 Shimo-Okubo, Sakura-ku, Saitama 338-8570, JAPAN
My main interests are rock weathering and geomorphological processes. This research can be applied to various fields such as stone deterioration of cultural heritages, durability of concretes, natural hazards, radioactive waste disposal, etc. However weathering often occurs over a long period of time, it occurs sometimes after very short time with irreversible consequences. It veils importance that human beings should be educated and consider our future lives.
Associate Professor Celine Schneider visited Saitama University several times. She and her colleagues, Associate Professors Maxime Gommeaux and Patricia Vazquez, and students visited my laboratory and went out field survey together. They came here by awarding “Kanry Program” fund in 2012, 2013 and 2014, and in exchange, my students, one after another, visited GEGENA and studied there.
The new building of the abbey constructed nearly less than 100 yearsago is suffering from salt weathering, whereas the old building constructed at middle age does not. The reasons of this phenomena are mainly coming from material difference, i.e., artificial stones are used in the new abbey but natural stones are used in the old abbey. Old type cement, mortar or lime mortars are used in the artificial stones and this is the most possible reason of deterioration due to salt weathering. We already installed the environmental monitoring sites and collecting temperature and relative humidity data for a few years. Furthermore, we carried out several experiments using building materials such as durability tests and leaching tests.
Acidic sulfates such as aluminum sulfates and ferric sulfates are often observed on the wall of tuff or volcanic rocks in Japan. We investigated wall surfaces of an artificial cave dug from 1941 to 1945 in the Miocene tuff. The cave is located in the historic site of Yoshimi Hyaku-Ana which is ancient graves of 6-7 centuries. The cave was suffering from severe salt efflorescence and deterioration of its cause. Salts are much in dry winter but less in humid summer. We put some rocks on the floor and continued field monitoring to assess how the rocks will weather at the site.
Professor Gamal M. E. KAMH visited Saitama University as a JSPS fellow from the 4th of June 2012 to the 3rd of April 2013. His research theme here was “NEW STANDARDS FOR LIMESTONE AND MORTARS USED FOR CONSERVATION OF THE ARCHAELOGICAL SITES AT ARID, and SEMI-ARID REGIONS”. He investigated many stones used in various archaeological sites in Egypt ( i.e the deterioration observed at Sphinx).
Kamh, G. M. E., Ismael, B. and Oguchi, C. T.: Pore size distribution and wall side orientation controlling salt susceptibility index “SSI” and weathering rate of stratified Pharaonic rock art. Restoration of Buildings and Monuments. vol. 19, pp. 1-22. 2013.
Swe Yu, Oguchi C.T.: Is sheer thenardite attack impotent compared with cyclic conversion of thenardite–mirabilite mechanism in laboratory simulation tests? Engineering Geology, vol. 152, pp. 148-154, 2013.
Kamh, G. M. E., Shehata, A. A., Oguchi, C. T., Rabea, R. A. and El-Sayed, S. S. M., Geologicaland geotechnical parameters controlling wall paints detachment at selected XXVI dynasty tombs, Bahariya Oasis, Egypt, Restoration of Buildings and Monuments, vol. 19, pp. 11-30, 2013
Oguchi C.T. Weathering Rinds: Formation Processes and Weathering Rates. In: John F. Shroder (ed.) Treatise on Geomorphology, Volume 4, pp. 98-110. San Diego: Academic Press. 2013.
Kamh, G.M.E. and Oguchi, C.T., Alteration Index, Normalized Weight Evolution and Geomorphic Changes of Dimensional limestone on artificial Salt Weathering. Restoration of Buildings and Monuments, vol. 18, pp. 381–396. 2012.
Shehata, A. A., Kamh, G. M. E., Oguchi, C.T., Rabea, R. A. and El-Sayed, S. S. M., Geological and Geotechnical Parameters Controlling Wall Paints Detachement at Selected XXVII Dynasty Tombs, Bahariya Oasis, Egypt. International Journal of Modern Engineering Research (IJMER), V. 2 (6), P. 4166–4179. 2012.
Song W., Ogawa, N., Oguchi, C. T., Hatta, T. and Matsukura, Y., Laboratory experiments on bacterial weathering of granite and its constituent minerals. Géomorphologie: relief, processus, environnement, Vol. 7, pp. 327-336, 2011.
Thomachot-Schneider, C., Gommeaux, M., Fronteau, G., Oguchi, C. T., Eyssautier, S. and Kartheuser, B., A comparison of the properties and salt weathering susceptibility of natural and reconstituted stones of the Orval Abbey (Belgium), Environmental Earth Science, Vol. 63, 1447-1461, 2011.
Thidar Aye and Oguchi, C. T. : Resistance of plain and blended cement mortars exposed to severe sulfate attacks, Construction and Building Materials, Vol. 25, 2988-2996, 2011.
Pham, T. P. C, Doldersum, T., Oguchi, C. T.: The sensitivities of the parameters in the WetSpa Extension model. Proceeding of International Conference on Design and Modeling in Science, Education, and Technology 2011 (DemSET 2011), pp.339-344, Orland, USA.
Fujimaki, T., Oguchi, C. T., Osawa, Y., Thomachot-Schneider, C., Gommeaux, M., Eyssautier, S. and Fronteau, G., Salt weathering susceptibility of natural limestone and reconstituted stone used in the Orval Abbey, Belgium. Proceeding of International Conference on Salt Weathering and Building Stone Sculptures. pp.161-168, Limassol, Cyprus, 2011.
Oguchi, C. T. and Yuasa, H., Effects of rock properties on salt weathering of Oya-tuff: an experimental study. Natural Stone Resources for Historical Monuments. Geological Society of London Special Publication, vol. 333, pp. 59-72, 2010.
Yu, S. and Oguchi, C. T., Is sodium sulphate invariably effective in destroying any type of rock? Natural Stone Resources for Historical Monuments. Geological Society of London Special Publication,vol. 333, pp.43-58, 2010.
Thidar Aye, Oguchi C. T. and Takaya, Y., Evaluation of sulfate resistance of Portland and high alumina cement mortars using hardness test. Construction and Building Materials, vol. 24, pp.1020-1026, 2010.
Yu, S. and Oguchi, C. T. Role of pore size distribution in salt uptake, damage, and predicting salt susceptibility of eight types of Japanese building stones. Engineering Geology, vol.115, pp. 226-236, 2010.
Oguchi, C. T., Takaya, Y., Yamazaki, M., Ohnishi, R., Thidar Aye and Hatta T., High acidic sulphate salt production on the cave wall in the Yoshimi Hyaku-Ana Historic Site, central Japan. Proceedings of the XIX Carpathian Balkan Geological Association (CBGA) Congress , Thessaloniki, Greece, Special Volume 100, pp. 413-419, 2010.
Yu, S. and Oguchi, C. T., Complex relationships between salt type and rock properties in a durability experiment of multiple salt-rock treatments. Earth Surface Processes and Landforms, vol. 34, pp. 2096-2110, 2009.
Oguchi, C. T., Sekiguchi, A., Thidar A., Takaya, Y. and Hatta, T., Strength reduction and surface alteration of mortars during Wetting/drying experiment using seawater and sulfate solution. Proceedings of International Symposium on engineering, Energy, and Environment. pp. 17-21, Thailand, 2009
Osawa, Y. and Oguchi, C. T., Role of micropores on freeze-thaw weathering of building stones. Proceedings of International Symposium on engineering, Energy, and Environment. pp. 117-121, Thailand, 2009.
Hachinohe, S, Ishiyama, T. Sasaka K., Ishihara, T., Sugai, T. Kumari, K. G. I. D. and Oguchi C. T., Development of Geo-database system with the perspective of Environmental Scientific use and its application. Proceedings of Geo-Informatics and Zoning for Hazard Mapping (GIZ2009), pp. 152-157, Kyoto, Japan, 2009.