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- W636617571 abstract "This paper describes the results of the analysis of the data collected during accelerated loading trials of unstabilised sandstone bases, and sandstone bases stabilised in situ with two percent bitumen and two percent cement, conducted with the Accelerated Loading Facility (ALF). The main aims of the trials were to confirm extensive field experience with fine-grained marginal materials and to provide information on the effects of pavement thickness, sandstone quality and bitumen-cement stabilisation on the performance of recycled sandstone bases. It was found that the life of the typical pavement with a nominal 125 mm of unstabilised sandstone could exceed the maximum design life of 106 ESAs expected for this pavement type under dry conditions. However, the pavement was very sensitive to loads (higher than ALF 40 kN axle load or standard axle load) and had a load damage exponent of 6 to 8 as compared to a value of 4 (ie the fourth power law) for other pavement types. Comparison of the performance of six reconstructed sandstone pavements (having two unstabilised sandstone materials of different quality and base thicknesses in the range of 75 mm to 250 mm) suggested that the effects of pavement thickness and sandstone quality were not significant under low axle loads (40 kN), but may be significant under higher axle loads (60 kN). Comparison of the performance of two percent bitumen and two percent cement-stabilised and unstabilised pavements 125 mm thick suggested that the stabilised sandstone layer had a higher stiffness and produced a lower deformation than the unstabilised sandstone. The stabilised material was also more resistant to moisture penetration. The impact of the results of this trial on Queensland Transport practice is also reported. The most significant aspects relate to reduced pavement depths now being adopted which translates to total project cost savings of approximately 15 percent with no reduced performance characteristics anticipated. The impact of the results of this trial on Queensland Transport practice is also reported. The most significant aspects relate to reduced pavement depths now being adopted which translates to total project cost savings of approximately 15 percent with no reduced performance characteristics anticipated." @default.
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- W636617571 date "1996-01-01" @default.
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- W636617571 title "The performance of marginal sandstone bases under accelerated loading" @default.
- W636617571 hasPublicationYear "1996" @default.
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