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Zhang Z.,Chongqing University | Qian J.,Chongqing University | You C.,Chongqing University | Hu C.,Sichuan CFBC Demonstration Power Co Ltd
Construction and Building Materials | Year: 2012

Circulating fluidized bed combustion (CFBC) fly ash and slag are wastes from CFBC power plant, and have such a high sulfur content (usually more than 5% SO 3 by weight) that would result in a great risk of destructive expansion when used in building materials, which are produced in normal temperature. This work investigated the preparation conditions of autoclaved brick with CFBC fly ash and slag, and compared the long-term volume stability and the hydration products between the autoclaved brick and adobe one. It is shown that the autoclaved brick could be made up of 77% CFBC fly ash, 20% CFBC slag and 3% cement by weight, and exhibited good long-term volume stability, and achieved the compressive strength of up to 14.3 MPa, and that there was no dihydrate gypsum and ettringite formation in the autoclaved brick so that the destructive expansion could be avoided. This work has carried out practical production and application of the autoclaved brick. It is concluded that CFBC fly ash and slag can be used to make high-quality brick as long as it is autoclaved. © 2012 Elsevier Ltd. All rights reserved. Source


Huo L.,Southwest University of Science and Technology | Li J.,Southwest University of Science and Technology | Lu Z.-Y.,Southwest University of Science and Technology | Zhang W.-Q.,Sichuan CFBC Demonstration Power Co Ltd | Hu C.-H.,Sichuan CFBC Demonstration Power Co Ltd
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2013

The physical and chemical properties of circulating fluidized bed combustion fly ash with different fineness were studied, especially the hydration property, for understanding the characteristics and application of superfine circulating fluidized bed combustion fly ash. The exothermic process, the phase and number of hydration products, as well as the micro-morphology and components were researched by XRD, TG, SEM, EDS, and etc test methods. The influence of fineness on the hydration property of circulating fluidized bed combustion fly ash was analysized. Results showed that reaction activity and effective components were improved by superfine grinding. The rates of anhydrite dissolution and exothermal reaction were increased by grinding, as well as the degree of hydration reaction. Problem of poor volume stability would also be solved by grinding. Source


Huo L.,Southwest University of Science and Technology | Li J.,Southwest University of Science and Technology | Lu Z.-Y.,Southwest University of Science and Technology | Zhang W.-Q.,Sichuan CFBC Demonstration Power Co Ltd | Hu C.-H.,Sichuan CFBC Demonstration Power Co Ltd
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2012

The geopolymer was a new kind of cementitious material with excellent performance. The synthesis of circulating fludized bed combustion(CFBC) fly ash-based geopolymer has been studied. The optimal conditions were as follows: the modulus and dosage of sodium silicate solution were 1.5 and 25%, respectively, the alkaline content of system was 30% and curing under 90°C. All that lead to the 7 d compressive strength of geopolymer was 58.9 MPa. The fire-resist properties of geopolymer was also studied. Results showed that geopolymer, which cured under low temperature, experienced 1 000°C can stimulate the improvement of strength. Source

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