Application of Metakaolin from Northeast of Thailand Used as Binder in Casting Process of Rice Polishing Cylinder
Abstract:The objective of this research was to apply metakaolin from northeast of Thailand as a binder in the casting process of rice polishing cylinder in replacement of the imported calcined magnesite cement and to reduce the production cost of the cylinder. Metakaolin was obtained from three different regions (Udon Thani, Nakhon Phanom, and Ubon Ratchathani). The design of experiment analysis using the MINITAB Release 14 based on the compressive strength and tensile strength testing was conducted. According to the analysis results, it was found that the optimal proportions were calcined magnesite cement: metakaolin from Udon Thani, Nakhon Phanom and Ubon Ratchathani equal to 63:37, 71:29, and 100:0, respectively. When used this formula to cast the cylinder and test the rice milling, it was found that the average broken rice percent was 32.52 and 38.29 for the cylinder contained the metakaolin from Udon Thani and Nakhon Phanom, respectively, which implied that the cylinder which contained the metakaolin from Udon Thani has higher efficiency than the cylinder which contained the metakaolin from Nakhon Phanom at 0.05 level of statistical significance. Whereas, the average wear rate of cylinder from both resources were 7.27 and 6.53 g/h, respectively.
 M. Naewpanich, “Quality of paddy”, Report of Harvest Back Engineering Research, Department of Agriculture, 2001.
 W. Pummarin and S. Ratanapusadee, “Modifying new rice mill cylinder for rice quality increasing : experimental in small rice mill machine”, Proceeding of IE Network 2002, Kanjanaburi, 24-25 October 2002.
 T. Boonkang and S. Lee, “Parameters study which affect to wear rate of rice mill cylinder in small rice mill” Proceeding of IE Network 2007, Bangkok, 18-19 December 2007.
 S. Bangpan, S. Lee and S. Jomjunyung, “The statistical of mixture design of rice mill cylinder” WCE 2008, London, 2-4 July 2008.
 S. Lee, S. Choksawadi and M.F. Lee, “Physical and mechanical properties study of composite material for rice mill cylinder casting, Research Report, Faculty of Engineering, Ubon Ratchathani University, 2003.
 Customer Department, “Statistic of Import and Export”, Customer Report, 2010.
 P. Jindaprasert and C. Jatupitak, Cement Pozzolan, Thai Concrete Association, 2008.
 J. Pasaraae, “Study of rice husk ash mixed with lime for block paving”, Thesis, Faculty of Energy Environmental and Material, King Mongkut's University of Technology Thonburi, 2003.
 N. Likitsripiboon, “Development of bagasse ash to pozzolan”, Thesis, Faculty of Engineering, King Mongkut's University of Technology Thonburi, 2004.
 J. Punyanusornkit, “Cement morta improvement by metakaolin for repair work”, Thesis, Faculty of Engineering, Kasetsart University, 2003.
 T. Boonkang, N. Pianthong, T. Pothom, S. Lee and S. Bangphan, “Development of pozzolan material as a binder replacement in the casting process of rice polishing cylinder”, Journal of Science and Technology, Ubon Ratchathani University, Vol.14, No.4, 2013.
 J.T. Ding and Z. Li, “Effects of metakaolin and silica fume on properties of concrete”, ACI Material Journal, pp 495-502, 2002.
 L. Courard, A. Darimont, M. Schouterden, F. Ferauche, X. Willem and R. Degeimbre, “Durability of mortars modified with metakaolin”, Cement and Concrete Research, Vol.33, Issue 9, pp: 1473–1479, 2003.
 H.M. Khater, “Influence of metakaolin on resistivity of cement mortar to magnesium chloride”, Vol.54, No.4, pp: 1473–1479, 2003.