Low-temperature synthesis of cements from rice hull ash
Rice hull is an agricultural by-product containing about 20% of silica. Usually, this material is burned at the rice fields generating small silica particles, which may cause respiratory and environmental damage. This work describes the use of rice hull ash as a raw material to prepare Ca{sub 2}SiO{sub 4}-related cements, which is a component of commercial Portland cement. Rice hull was heated at 600 deg. C rendering silica with a surface area of 21 m{sup 2} g{sup -1}. This material was mixed with CaO and BaCl{sub 2}{center_dot}2H{sub 2}O in several proportions, added stoichiometricaly in order to keep a ratio (Ca+Ba)/Si=2. The solids were mixed with water 1:20 (w/w) and sonicated for 60 min. The suspensions were dried and heated at several temperatures (from 500 to 1100 deg. C). The resulting solids were analyzed by FT-IR spectroscopy and X-ray diffraction. Cements with structure similar to that of {beta}-Ca{sub 2}SiO{sub 4} were obtained at temperatures as low as 700 deg. C, according to the composition.
- OSTI ID:
- 20658264
- Journal Information:
- Cement and Concrete Research, Vol. 33, Issue 10; Other Information: DOI: 10.1016/S0008-8846(03)00104-2; PII: S0008884603001042; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
- Country of Publication:
- United States
- Language:
- English
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