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Abstract

Under the consideration of environmental protection, direct disposal of coal ash is not acceptable. It is required to solidify fly ash before ocean disposal or land disposal. The objective of this study is to investigate the properties and the possible applications of the solid blocks produced from fly ash. Thirty-six mixes have been proportioned using different cementing materials such as portland cement, lime, sludge treatment compound, and industrial silica slag. Extensive laboratory studies have been conducted to evaluate the block properties such as compressive strength, tensile strength, abrasion resistance, and soundness. In addition, the possible engineering application is also evaluated. Test results show that (1) portland cement is the most possible cementing material for solidifying fly ash, and the use of lime, silica fume and sludge treatment Compound as partial replacement for cement may improve the properties of the solid blocks; (2) natural sand used as part of mixes may improve the strength and durability of the solid blocks; (3) the leaching rate of metals is low so that the solid blocks can be environmentally acceptable in the seawater; (4) based on the laboratory observations, the fly ash blocks of this study are potential construction materials for marine engineering.

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