Long term evaluation and identification of the proper testing program for ASTM Class C fly ash stabilized soils.
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1994-04-01
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Abstract:A review of current practice and a laboratory test program were conducted in an evaluation of protocol used for soil stabilized with Class C fly ash. The long-term performance of soil stabilized with Class C fly ash was also reviewed. The test program included an evaluation of material properties as well as mixed design methods with their corresponding testing requirements. X-ray diffraction and electron microscopy were performed in reviewing the long-term variations in strength and the effects of curing conditions on the cementitious products being formed.
The study reviews the unique physical properties that influence the development of strength. The relationship between gradation characteristics, density, compaction water, and strength are explored. A relationship of comparable strengths produced between portland cement and an equal amount of the CaO constituents in the Class C fly ash is proposed as a design guide. The curing requirement for the strengths produced in different mixtures varied. Curing time and conditions are recommended on the basis of strength development. A distinct long-term advantage was observed in using lime with the Class C fly ash in sands and coarse aggregate.
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