American Society of Civil Engineers

Sustainable Utilization and Experimental Study on Wet Fly Ash by Sea Water

by Wei Shi, (School of Civil Engineering, Qingdao Technological University, Fushun Road 11, Qingdao, China, 266033. E-mail: and Jie Han, (Civil, Environmental, & Architectural Engineering (CEAE) Department, The University of Kansas, 2150 Learned Hall, 1530 W. 15th Street, Lawrence, 66045-7609. E-mail:
Section: Sustainable Materials, pp. 553-559, (doi:

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Document type: Conference Proceeding Paper
Part of: ICSDC 2011: Integrating Sustainability Practices in the Construction Industry
Abstract: Fly ash is one of the major industrial solid wastes. Many power plants of coastal cities in China produce a large amount of wet fly ash in sea water. Fly ash not only takes up significant land resources, but also causes pollution in soil and water. Sustainable utilization of wet fly ash produced in sea water is possible in civil engineering. For example, it can be used as backfill for embankments, retaining walls, and reclaimed land. Cement can be used to increase the strength and stiffness of fly ash if needed. To achieve this goal, a study was conducted to evaluate basic mechanical properties of wet fly ash by sea water. The primary test method adopted in this study was an unconfined compression test. Wet fly ash by sea water or fresh water was stabilized by cement. The test results show that the stabilized wet fly ash by cement had high unconfined compressive strengths, which increased with the cement content and curing time. The stabilized fly ash by sea water had a higher initial strength but lower long-term strength than that by fresh water.

ASCE Subject Headings:
Sustainable development
Fly ash
Sea water