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Pages 82-91

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From page 82...
... 71 CHAPTER SEVEN PAVEMENT ENGINEERING APPLICATIONS AND ISSUES INTRODUCTION Thus far, the relationship between APT and constituent elements of the pavement engineering system has been reviewed. In this chapter, a number of APT-related issues are covered.
From page 83...
... 72 On the basis of the established relationships, the LCPC researchers are able to evaluate the performance of new materials using APT. This methodology has been used extensively by LCPC and their industrial partners to establish the performance of new materials (many of which are proprietary)
From page 84...
... 73 material, binder type, binder content, etc. We never have had a good agreement with laboratory beam testing.
From page 85...
... 74 deflection with depth, and in situ strength and strain, were monitored. With this process, changes in secondary indicators were linked to primary indicators and used to calibrate mechanistic models of pavement structures.
From page 86...
... 75 From an examination of the long-term performance of the highway pavement, the researchers concluded that the failure mechanism was similar to that which had been found with HVS testing. However, failure had occurred after a significantly different number of ESALs.
From page 87...
... 76 FAILURE CRITERIA This issue relates to the previous topic. It is the basis for defining benchmarks to ensure comparable APT performance relative to real pavement performance under conventional traffic.
From page 88...
... 77 As discussed earlier, a number of APT programs have monitored and kept detailed records on the performance of pavements tested in an accelerated mode, either directly or indirectly. Other programs, such as several in South Africa, have only recently included such procedures in their test plan (Jooste et al.
From page 89...
... 78 APT programs, has improved understanding of the performance of pavements and its prediction. In turn, this has led to cost savings and it has enhanced construction and rehabilitation practices.
From page 90...
... 79 The HVS–SA program successfully completed APT studies on airport pavements in South Africa in the early 1980s (Clifford et al. 1982; Clifford and Opperman 1983)
From page 91...
... 80 • Validation and modification of design procedures, • Pavement configuration comparison in terms of performance, • Evaluation of material performance, • Performance prediction of pavements, • Evaluation and improvement of construction practices, and • Evaluation of maintenance and rehabilitation practices. In this chapter, the applications and issues emanating from APT applications were considered.

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