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<p>The first airfield rigid pavement in Nepal at Pokhara International Airport was constructed without considering the reactivity of aggregates. This study investigates the source of aggregates based on modified ASTM C-1260 test, and reveals that the 28-day expansion of the mortar bars exceeded the limit set by the Federal Aviation Administration (FAA), USA. Degradation in modulus of rupture is estimated based on the mortar bar expansion, environmental conditions of Pokhara, and literature data. By considering the degradation in modulus of rupture, FAARFIELD software developed by FAA is used to estimate the structural life of the pavement. The analysis shows that its structural lifespan may be limited to 7.7 years, despite the pavement being originally designed for 30-year structural life. While the specification of the Civil Aviation Authority of Nepal does not have provisions to test the reactivity of aggregates, this study highlights the need to include alkali-silica reactivity test measures in such specifications in Nepal and elsewhere. Finally, this study discusses a limitation in FAARFIELD software, which is widely used in the analysis and design of airfield pavements.</p>

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ASR Potential of the Concrete Pavement of Pokhara Airport

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Pawan Acharya,
  • Bishnu Prasad Gautam

摘要

The first airfield rigid pavement in Nepal at Pokhara International Airport was constructed without considering the reactivity of aggregates. This study investigates the source of aggregates based on modified ASTM C-1260 test, and reveals that the 28-day expansion of the mortar bars exceeded the limit set by the Federal Aviation Administration (FAA), USA. Degradation in modulus of rupture is estimated based on the mortar bar expansion, environmental conditions of Pokhara, and literature data. By considering the degradation in modulus of rupture, FAARFIELD software developed by FAA is used to estimate the structural life of the pavement. The analysis shows that its structural lifespan may be limited to 7.7 years, despite the pavement being originally designed for 30-year structural life. While the specification of the Civil Aviation Authority of Nepal does not have provisions to test the reactivity of aggregates, this study highlights the need to include alkali-silica reactivity test measures in such specifications in Nepal and elsewhere. Finally, this study discusses a limitation in FAARFIELD software, which is widely used in the analysis and design of airfield pavements.