Construction & Comparison of LA’s Conventional and Alternative Base Courses Under Accelerated Loading
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2008-01-01
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Alternative Title:LTRC implementation update : research in practice : LTRC report No.347.
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Abstract:The performance of the base and subbase material combinations was evaluated by comparing the development of rutting, roughness, and cracking observed during ALF loading for each test lane. Plots were prepared to graphically summarize performance and compare test lanes. A criterion that can be used to evaluate the performance of a flexible pavement is its ability to carry loads before reaching a critical rut depth. The slower the rut development, the better the pavement structure performs. To compare the relative performance of each lane, a common rut depth of 0.75 in. was used as the basis for comparison. Performance comparisons showed that stone bases performed as well as soil cement bases, and mixed-in-place bases performed similarly to plant-mixed bases. Furthermore, bases composed of stone over cement-stabilized or cement-treated soil performed better than either of these base materials used separately. Results showed that an increase in load-carrying capacity comes from an increase in base thickness, regardless of cement content.
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