Construction Cycle 2 (CC-2)
Construction Cycle 2 consisted of four separate components. Select a test below to see detailed information and search the data.
The CC2 Test Strip was a preliminary experiment intended to study the effects of slab size and mix design on pavement curling during the early age of the concrete. The results of this test helped to define the parameters of the main experiment below.
Construction of this slab at the NAPTF was intended to provide experience for the design, placement, and monitoring of the actual PCC test items.
This preliminary experiment consisted of two instrumented slabs with different concrete mixes. The purpose was to compare the behavior of the slab with no fly ash content to the behavior of a companion slab with high fly ash content.
The CC2-2 test items replaced the CC-1 test items in the medium strength subgrade area. Test items were designed and constructed to compare the performance of three types of rigid pavements: concrete slabs on stabilized bases (MRS); concrete slabs on aggregate bases (MRC); and concrete slabs placed directly on subgrade (MRG).
The three rigid airport pavement test items (MRC, MRG, and MRS), built as CC2 main test items at the FAA National Airport Pavement Test Facility (NAPTF) with 12-inch thick concrete slabs on different support systems, were rubblized with a resonant pavement breaker and overlaid with five inches of P-401 hot mix asphalt (HMA). The overlaid pavements were subjected to full-scale accelerated traffic loading to observe the changes in the modulus of the rubblized concrete layer.