عنوان مقاله [English]
Concrete pavement is used in the aprons owing to its resistance to static loads as the main loads of aircraft. Its main problem is costly and flight-disrupting repairs. An alternative is to use interlocking concrete block pavement with advantages such as simple execution and repair and with no needs for curing. There is concern about the effect of subgrade CBR on the resistance of block pavers to permanent deformation. The present study was conducted to investigate the effect of subgrade CBR on these pavements in the apron. PLT were first performed on a 2m×2m prototype constructed as per Federal Aviation Administration (FAA) regulations. The layers of this 3D model include compacted subgrade, sub-base, crushed aggregate base and cement-treated base (CTB) and 8-cm thick concrete blocks. Sensitivity analysis showed a reduction of over 12% in vertical deflection with increasing CBR from 2 to 10 and a reduction of below 4% in the presence of subgrade even with CBR=10~20%, Due to the adjustment of the role of the CTB in front of the subgrade, it is more resistant. Using subgrade with CBR of over 10 was found to insignificantly increase the resistance of block pavements to permanent deformation. Concern about the risk of permanent deformation is largely obliterated given the key role of the cement-treated base in redistributing the loads.
. Ziari, H., P. Hayati, and J. Sobhani, Airfield self-consolidating concrete pavements (ASCCP): Mechanical and durability properties. Construction and Building Materials, 2014. 72: p. 174-181.