Laboratory Investigation of Natural Cementation Road Surfacing for Corrosion Control of Aluminum on Army Vehicles: Contractors Supplemental Report for Project F10 AR06
University of Hawai?i at Manoa Department of Civil and Environmental Engineering Honolulu United States
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The Department of Defense DoD operates a massive fleet of ground vehicles in many corrosive environments. Rutting and erosion of unpaved roadways in training areas damage vehicles and contribute to dust brownouts. Moisture, soil, and grit deposits on surfaces and undercarriages accelerate corrosion and increase maintenance requirements. These problems could be greatly mitigated by advanced road stabilization materials and practices. A geopolymer material was studied for demonstration and validation on unpaved military roads at Pohakuloa Training Area PTA, HI, under DoD Corrosion Prevention and Control Project F10-AR06. To support that work, the University of Hawaii at Manoa performed a series of laboratory tests to characterize the geopolymer and its constituent materials, such as fly ash and slag, and the resulting cementitious material when blended with lime, soda ash, basalt aggregate, and water. Material characterization and mechanical testing was performed to characterize the basalt aggregate. Geopolymer mechanical properties were then characterized in unconfined compression and four-point bending tests. Microstructural and mineralogical characteristics of the constituents and geopolymer were characterized using x-ray fluorescence, scanning electron microscopy with energy dispersive spectroscopy, and x-ray diffraction. The 28-day geopolymer unconfined compressive strengths averaged about 2,000 psi and the modulus of rupture averaged about 290 psi.
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- Civil Engineering