United States Department of Transportation
i
Using CSA Cement for Novel Waterway Repair Materials
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2021-09-21
[PDF-1.89 MB]
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Edition:August 13, 2018 to August 31, 2021
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Abstract:Many maritime structures (e.g., locks, dams, ports) in the US are either reaching or are past their design lives, and there are limited funds for necessary maintenance activities which can often lead to closures. These structures are not easy to detour and often require dewatering before repairs can be made. Closures can cause delays and business-related losses which can have a large economic effect. Thus, it is advantageous to reduce the repair time for maritime structures. BCSA (belitic calcium sulfoaluminate) cement is a promising repair material due to its properties. BCSA cement is a fast-setting hydraulic cement capable of reaching compressive strengths greater than 4000 psi (27.6 MPa) in less than 2 hours. BCSA also has low shrinkage and good long-term strengths. This research consisted of developing an optimal rapid-setting underwater repair mortar mixture design using BCSA cement. Properties such as compressive strength and workability were tested to select the best mix design. Additionally, soil-cements made with BCSA cement were compared to portland cement-based soil-cements. These soil cements have applications for the rapid repair of levees and earthen dams, but also for rapid soil stabilization. The results obtained proved that BCSA cement is a promising material for rapid underwater repairs and repairs of soil-based waterway structures.
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