Gypsum is widely distributed in Tunisia occurring in the formation of Triassic age. The gypsum deposit of Mellegue is the alabastine type with a little of the porphyroblast type and contains traces of clay minerals and calcite. It is a moderately strong rock in terms of its unconfined compressive strength of 16 Mpa and tensile strength of 3.35 Mpa. Triaxial testing values indicated an apparent cohesion of 10 Mpa and an angle of friction of 26°. The gypsum studied had a percentage of SO3 of 41.71% and a percentage of CaO of 32.9%. All the samples had low densities according to the International Association of Engineering Geology (IAEG) classification and exhibited a moderate porosity whether effective or absolute. The gypsum proved to be moderately strong when tested in unconfined compression and tensile strength. Thermal analysis indicated a total weight loss of 20.27% and the whiteness index about 90%. This proved a high degree of whiteness. The time of setting can be considered short and medium, which is quite favorable for industrial application compared with other gypsum deposits currently operated.
References
[1]
Burollet, P.F. (1973) Importance of Saliferous Factors in Tunisian Tectonics. Annales Mines and Geology, No. 26, 110-120.
[2]
Busson, G. (1974) The Evaporite Trias of North Africa and Western Europe: Data on Paleogeography and Deposition Conditions. French Society of Geology, No. 6, 653-665.
https://doi.org/10.2113/gssgfbull.S7-XVI.6.653
[3]
Jouirou, M. (1981) Geological and Geotechnical Study of the Sediments of the Kef Region North West of Tunisia. Thesis 3rd Cycle, Univ Bordeaux I, 146.
[4]
Ghanmi, M. (1980) Geological Survey of Djebel Kabbouch (Tunisia Spetentrionale). Thesis 3rd Cycle, Univ. Paul Sabatier, Toulouse, 119.
[5]
Adil, S. (1993) Dynamics of the Triassic in the North of Tunisia: Basin in Multiple Relay of Decay, Magmatism and Mining Implications. Thesis 3rd Cycle, Univ. Tunis II, 217.
[6]
Biely, A. and Rakus, M. (1972) Critical Analysis of Data on the Age of the Spring in Northern Tunisia. Geology of Tunisia, No. 38, 35-48.
[7]
Chikhaoui, M. (2002) The Diapir Zone in Tunisia: Structural Framework and Geodynamic Evolution of Meso-Cenosoic Sedimentation and Geometry of Triassic Bodies. Thesis, Univ. Tunis II, 323.
[8]
Daligand, F., et al. (1982) Plaster: Physico-Chemistry, Manufacturing and Jobs. Boulvard Saint-Germain, Paris.
[9]
Garrido, F., Illera, V. and Garcia-Gonzalez, M.T. (2005) Effect of the Addition of Gypsum- and Lime-Rich Industrial by Products on Cd, Cu and Pb Availability and Leachability in Metal-Spiked Acid Soils. Applied Geochemistry, 20, 397-408.
[10]
Han-Cheol, C., Hori, M., Yoshida, T., Yamada, N., Komada, Y., Tamaki, Y., et al. (2014) Tri-Calcium Phosphate (β-TCP) Can Be Artificially Synthesized by Recycling Dihydrate Gypsum Hardened. Dental Materials Journal, 33, 845-851.
https://doi.org/10.4012/dmj.2014-040
[11]
Kojima, Y. and Yasue, T. (2006) Synthesis of Large Plate-Like Gypsum Dihydrate from Waste Gypsum Board. Journal of the European Ceramic Society, 26, 777-783.
https://doi.org/10.1016/j.jeurceramsoc.2005.06.018
[12]
Mansour, M.B., Soukaina, C.A., Benhamou, B. and Jabrallah, S.B. (2013) Thermal Characterization of a Tunisian Gypsum Plaster as Construction Material. Energy Procedia, 42, 680-688. https://doi.org/10.1016/j.egypro.2013.11.070
[13]
San-Antonio-González, A., Del Río Merino, M., Arrebola, C.V. and Villoria-Sáez, P. (2015) Lightweight Material Made with Gypsum and Extruded Polystyrene Waste with Enhanced Thermal Behaviour. Construction and Building Materials, 93, 57-63.
https://doi.org/10.1016/j.conbuildmat.2015.05.040
[14]
Singh, N.B. and Middendorf, B. (2007) Calcium Sulfate Hemihydrate Hydration Leading to Gypsum Crystallization. Progress in Crystal Growth and Characterization of Materials, 53, 57-77. https://doi.org/10.1016/j.pcrysgrow.2007.01.002
[15]
Zhang, D., Yuan, Z., Wang, S., Jia, Y. and Demopoulos, G.P. (2015) Incorporation of Arsenic into Gypsum: Relevant to Arsenic Removal and Immobilization Process in Hydrometallurgical Industry. Journal of Hazardous Materials, 300, 272-280.
https://doi.org/10.1016/j.jhazmat.2015.07.015
[16]
Zhou, J., Liu, C., Shu, Z., Yu, D., Zhang, Q., Li, T. and Xue, Q. (2015) Preparation of Specific Gypsum with Advanced Hardness and Bending Strength by a Novel In-Situ Loading-Hydration Process. Cement and Concrete Research, 67, 179-183.
https://doi.org/10.1016/j.cemconres.2014.09.004
[17]
Bouaziz, S., Barrier, E., Soussi, M., Turki, M.M. and Zouari, H. (2002) Tectonic Evolution of the Northern African Margin in Tunisia from Paleostress Data and Sedimentary Record. Tectonophysics, 357, 227-253. https://doi.org/10.1016/S0040-1951(02)00370-0
[18]
Ali, F.B., Iucolano, F., Liguori, B., Piscopo, D., Marino, O. and Caputo, D. (2016) Physical and Mechanical Characterization of Sun-Dried Bricks. A Case History: The Galeb of Kebili. Materials and Structures, 49, 159-165.
[19]
Sdiri, A., Higashi, T., Bouaziz, S. and Benzina, M. (2014) Synthesis and Characterization of Silica Gel from Siliceous Sands of Southern Tunisia. Arabian Journal of Chemistry, 7, 486-493. https://doi.org/10.1016/j.arabjc.2010.11.007
[20]
Jauzein (1967) Contribution to the Geological Study of the Confines of the Tunisian Ridge (Northern Tunisia). Annales Mines Geology, (Tunis) 22/4.
[21]
Villa, J.M. (1994) Discovery in Tunisia at the SW of the Kef of Triassic Material Interstratified in the Albian: Extension of the Domain “Salt Glacier” under the Algerian-Tunisian Confines. Report of the Paris Academy of Sciences, 318, 109-116.
[22]
Villa, J.M., et al. (1995) Halocinesis Distensive Albien with Submarine “Salt Glaciers” and Tertiary Folding of the Sector Ouenza-Ladjebel-Meridef: Details following the Article of A. Bouzenoune, H. Rouvier and J. Thibiéroz, “Trias de l’Ouenza: Diapiric context, mineralogical zonation and metallogenic consequences”. Geological Service Bulletin (Algéria), 2, 1-35.
[23]
Bolze, J. (1954) Ascension and Breakthrough of the Middle Cretaceous Diapirs in the Mounts of Téboursouk. Cr. Somm. French Society of Geology, 139-141.
[24]
Bolze, J. (1955) Presence of the Wealdian in the Diapir Zone Saliferous Series (Northern Tunisia). Geological Service Bulletin, t. 240, No. 11, 2103-2105.
[25]
Bolze, J. (1957) Attribution to the Jurassic of Part of the North Tunisian Saline Series. Cr. Somm. French Society of Geology, 4, 74-75.
[26]
Gottis, S. (1954) General Observations on the Tunisian Triassic. French Society of Geology, 12, 262-266.
[27]
Murat, M. and Foucault, M. (1977) Calcium Sulphates and Derived Materials. International Colloquies of RILEM, Saint Remy les chevreuses, France.
[28]
Karmazsin, E. (1978) Kinetics and Mechanism of Hydration of Calcium Sulphates. Study by Calorimetry in Isothermal Regime. PhD Thesis of INSA Lyon, 150.
[29]
Triollier, M. (1979) Hydration of Calcium Sulphate Hemihydrate. Doctoral Thesis of the University of Grenoble, France.
[30]
Standard NF EN 13279-2 (2005) Plaster and Plaster Based Plaster for Building-Part.
[31]
Coquard, P. (1992) Mechanical Strength of Dry and Wet Plasters. PhD Thesis of the University of Aix-Marseille III, France, 93.
[32]
Standard X08-011 (2012) French Experimental Standard for Determining the Whiteness Index.
[33]
Barriac, P. (1986) Swelling of the Plaster. Lafarge Internal Report.
[34]
Standard EN 196-3 (2005) Method for Determining the Consistency of Gypsum.
[35]
Standard NF P 94-074 (1994) Triaxial Revolution Test—Apparatus.
[36]
Hoek, E. (1983) The Strength of Jointed Rock Masses. Géotechnique, 33, 187-223.
https://doi.org/10.1680/geot.1983.33.3.187
[37]
IAEG (1979) Classification of Rocks and Soils for Engineering Geological Mapping Part 1: Rock and Soil Materials. Bulletin of the International Association of Engineering Geology, 19, 355-371.
[38]
Deer, W.A., Howie, R.A. and Zussman, J. (1962) An Introduction to the Rock Forming MINERALS. Longmans, London, 528 p.
[39]
Badens, E., Veesler, S., Boistelle, R. and Chatain, D. (1999) Relation between Young’s Modulus of Set Plaster and Complete Wetting of Grain Boundaries by Water. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 156, 373-379.
https://doi.org/10.1016/S0927-7757(99)00097-7
[40]
PNT 47.66-1 (2007) Plasters and Plaster Based Plaster for Building. Part 1: Definition and Specifications.
[41]
PNT 47.66-2 (2007) Plasters and Plaster Based Plaster for Building. Part 2: Test Methods.
