| dc.description.abstract | Petroleum coke combustion occurs inside the body of Circulating Fluidized Bed Boiler, referred to as CFB, in order to generate power. To avoid excess emissions of sulfur oxides from the high post-combustion sulfur content of petroleum coke, limestone is added, generating a by-products, namely, lime CFB byproduct.
In this study, the development in the utilization of fly ash from lime CFB byproduct as cement is researched. The quality as cementing materials from lime CFB byproducts were evaluated for various batch. Feasibility of using lime CFB byproducts were then assessed and a database established. In addition, lime CFB cement was used for concrete application. Different mixes were produced and laboratory tests on the durability of concrete made with CFB fly ash were conducted to evaluate the long-term effectiveness of using concrete made from lime CFB byproducts and to evaluate future promotion in the utilization of resources from lime by-products.
Research results show that, CFB fly ash were best used in cement when the fly ash content was about 20%. The use of CFB fly ash by amount of more than 25% will cause excessive volume expansion or uncontrolled shrinkage. In concrete, the use of lime flyash by-product would cause retardation effect during the production of concrete. By adjusting admixtures and reducing the mixing water, the setting time is extended. In comparison to concretes made with non-CFB fly ash with a reference strength intensity of 210 kgf/cm2, the strength of 280 kgf/cm2 produced is able to meet the requirement. The addition of CFB fly ash has met the requirements of compressive strength of the reference concrete. Durability test results have shown that the addition of CFB is better than that of ordinary fly ash, indicating CFB fly ash great potential use as a by-product resources for concrete production.
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