Soil Stabilization Field Trial, Interim Report 3: Fid-Bau Portal

Soil Stabilization Field Trial, Interim Report 3

Seeking for materials and methods to alleviate cracking in cement-treated soil, six field sections were constructed in August 17 and 18, 2000 incorporating the following material combinations or methods each in a separate but contiguous test section of 305m (1000 feet) long: cement, precracked cement layer, precut cement layer, cement-fly ash, lime-ground granulated blast furnace slag (GGBFS), and lime-fly ash (LFA). First interim report covering the first phase of investigation/monitoring during the 28-day period was submitted in April 21, 2001. Two layers of asphalt concrete 11cm (4.5 inches) base, 6cm (2.25 inches) polymer modified binder were placed over the stabilized layer beginning September 21, 2000, followed by the second field monitoring on November 13, 2001. Field tests include deflection tests employing Falling Weight Deflectometer (FWD), retrieval of 10-cm (4-inch) cores for compression tests, and a manual crack survey. The results were presented in Interim Report II, which included a discussion as to possible changes (strength- and stiffness-gain, and crack reflection) over a fourteen-month period, since September 15, 2001 when the first monitoring was completed. On June 16, 2003, (nominally 3 years) the test sections were monitored; this time again deflection tests employing FWD, and a manual crack survey. Prior to the June 2003 survey, a 5 cm (2 inches) polymer modified surface course was placed, with the road opening to traffic on July 8, 2002. Presented in this report are the results of deflection analysis discussing comparative performance of various stabilizing agents or special crack mitigation techniques included in the test program.