ALKALI ACTIVATION OF CERAMIC WASTE | ||||
| Al-Azhar Bulletin of Science | ||||
| Article 14, Volume 21, Issue 2-A, December 2010, Page 189-206 PDF (642.45 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/absb.2010.7375 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| F. A. NASSAR* 1; M. R. MOSTAFA1; M. E. SARAYA1; T. EL SOKKARY2; E. EL-FADALY3; H. EL-DIDAMONY4 | ||||
| 1Department of Chemistry, Faculty of Science, Al-Azhar University, Cairo, Egypt. | ||||
| 2Housing and Building Department, National Research Center, Cairo, Egypt | ||||
| 3Environmental Researches and Studies Institute, Monofeya University, Egypt | ||||
| 4Faculty of Science, Zagazig University, Zagazig, Egypt. | ||||
| Abstract | ||||
| In ceramic tile production, because of various reasons, unsold fired products come out. These are waste tiles and only a little part of them are used. If these waste tiles were used in geopolymer production, this pollution decreases. In this study, usage of waste tile as pozzolan was studied. In this paper the effect of sodium silicate solution with different molar ratio on the compressive strength the synthesis of Egyptian ceramic waste -based geopolymers is investigated. Eight different alkaline solutions with different soluble silica contents were used to activate ceramic waste. The primary reaction product was a sodium aluminosilicate gel, while different types of zeolites appeared as minority phases. The percentage and composition of these reaction products were found to depend on both the soluble silica content present in the activating solutions and curing time. In addition, the amount of gel was observed to have a decisive effect on the mechanical strength developing in the material. X-ray diffract grams of geopolymers indicated the existence of the major amorphous phases of ceramic waste, as well as the formation of a new amorphous phase in the geopolymeric matrices. Fourier-transform infrared (FTIR) spectroscopy analysis revealed essential ceramic waste phase transformations within geopolymers that affected their mechanical strength. The results of the current research indicate that a compressive strength is increased with the increase of alkali content, as well as with the increase of sodium silicate in the synthesis of geopolymers. | ||||
| Keywords | ||||
| alkali activation; ceramic waste; Compressive strength; DTA; XRD; FT-IR | ||||
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