Study of Rice Husk Ash as Potential Source of Acid Resistance Calcium Silicate
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Abstract
In present work acid resistant calcium silicate has been synthesized from silica of rice husk and calcium oxide of analytical grade. The silica from rice husk was extracted at 550<sup>o</sup>C in amorphous form and then allowed to react with calcium oxide in the presence of excess water by Sol-Gel technique to obtain calcium silicate hydrate gels. The molar ratios of Si/Ca were adjusted each time to obtain silica rich calcium silicate hydrates. The gels were dried in oven and calcined in muffle furnace at various temperatures to obtain acid resistant calcium silicate. The products were tested by analytical technique and by FTIR and XRD machines. Studies show that at higher molar ratio of Si/Ca, the heat treatment improves the acid resistivity of calcium silicate whereas at lower molar ratios the heat treatment does not make it acid resistant.
- V. P. Della, I. Kuhn and D. Hotza, “Rice Husk Ash as an Alternate Source for Active Silica Production,” Materials Letters, Vol. 57, No. 4, 2002, pp. 818-821. doi:10.1016/S0167-577X(02)00879-0
- Q. Yu, K. Sawayama, S. Sugita, M. Shoya and Y. Isojima, “The Reaction between Rice Husk Ash and Ca(OH)2 So-lution and the Nature of Its Product,” Cement and Con-crete Research, Vol. 29, No. 1, 1999, pp. 37-43. doi:10.1016/S0008-8846(98)00172-0
- D. G. Nair, A. Fraaij, A. A. K. Klaassen and A. P. M. Kentgens, “A Structural Investigation Relating to the Pozzolanic Activity of Rice Husk Ashes,” Cement and Concrete Research, Vol. 38, No. 6, 2008, pp. 861-869. doi:10.1016/j.cemconres.2007.10.004
- D. An, Y. Guo, Y. Zhu and Z. Wang, “A Green Route to Preparation of Silica Powders with Rice Husk Ash and Waste Gas,” Chemical Engineering Journal, Vol. 162, No. 2, 2010, pp. 509-514. doi:10.1016/j.cej.2010.05.052
- S. Tsunematsu, H. Yamada, E. Abe and K. Inoue, “Method for Preparation of Acid Resistant Calcium Silicate,” US Patent No. 5750038, 1998.
- P. Chindarprasirt and P. Kanchanda, “Sulfate Resistance of Blended Cements Containing Fly Ash and Rice Husk Ash,” Construction and Building Materials, Vol. 21, No. 6, 2007, pp. 1356-1361. doi:10.1016/j.conbuildmat.2005.10.005
- S. Tsunematsu, H. Yamada, K. Kimura and K. Inoue, “Improvement of Acid Resistance of Calcium Silicate by Thermal Treatment,” Cement and Concrete Research, Vol. 34, No. 4, 2004, pp. 717-720. doi:10.1016/j.cemconres.2003.09.010
- D. L. Palva, G. M. Lampman, G. S. Krlz and J. R. Vy-vyan, “Introduction to Spectroscopy,” Brooks/Cole, Cen-gage Learning, Belmont, 2009.
- A. Meiszterics and K. Sinko, “Sol-Gel Derived Calcium Silicate Ceramics,” Colloids and Surfaces A, Vol. 319, No. 1-3, 2008, pp. 143-148. doi:10.1016/j.colsurfa.2007.08.021