Significant Findings from Full-Scale Accelerated Pavement Testing (2004) / Chapter Skim
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63 CHAPTER SIX DEVELOPMENT AND VALIDATION OF REHABILITATION, CONSTRUCTION, AND MAINTENANCE STRATEGIES INTRODUCTION This chapter discusses significant APT findings pertaining to the enhancement of rehabilitation designs of pavements, as well as improvements to practice in the construction and maintenance of pavements. In rehabilitation design, the stiffness and other characteristics of the existing support structure influence the type and thickness of the rehabilitation overlay(s)
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64 the pavement structure as a whole and an investigation into the drainage of the structure. Apparently there was a difference in the structural capacity of the underlying structure of one rehabilitation strategy that affected its rutting performance.
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65 Asphalt over Concrete Strauss et al.
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66 TABLE 3 EXPECTED OVERLAY LIFE TO FIRST REFLECTION CRACKING, FROM HVS TESTING AND PRECONSTRUCTION ANALYSIS (NDOT–SA 1997) Option Overlay Expected Life in ESALs (millions)
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67 sociation jointly constructed eight full-scale lanes of UTW over existing HMA pavements, which included a range of asphalt binders. ALF loading of the lanes showed that the stiffness of the underlying HMA had significantly more effect on the development of cracking distresses in the UTW than did the variables designed into the overlays themselves (UTW thickness, joint spacing, and fiber reinforcement)
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68 Hugo et al.
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69 maintenance interventions were implemented rather than rehabilitating the highway when it reached the terminal level of serviceability. Constructability Constructability is an issue that has also been addressed in APT programs.
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70 deformation within the base. Lessons learned in the design and construction of these large stone mixes led to extensive use of these materials in Kwazulu–Natal.
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