01088340

Component

This study was a collaborative effort between the Arizona Department of Transportation (ADOT), Arizona State University (ASU), and the local concrete industry to evaluate the effect and potential performance of Polypropylene Fiber Reinforced Thin Whitetopping pavement sections in Arizona. A laboratory experimental program was undertaken to evaluate the engineering properties for four different mixtures: a control mix with no fibers, and mixes with Polypropylene fibers using the following dosages: 3, 5 and 8 lb/cy. Various samples were collected during construction and tested for compression, flexural, and toughness using cylindrical, prismatic and round panel specimens. While the compression results did not show any added benefit with the addition of polypropylene fibers, the analysis of flexural and round panel tests demonstrated the advantage of the fibers. Specifically, the toughness results from both tests showed an increase in these values when the percentage of fibers was increased. However, the results of toughness can not be taken into account using common concrete pavement design methodologies, since the traditional input value is the modulus of rupture. Therefore, an analysis approach was performed that take into account the additional benefit of the polypropylene fibers by adding a residual strength to the modulus of rupture. It was concluded that the effect of the addition of fibers was best captured using the round panel test. The percentage increase in toughness values from the different fiber dosages was larger in the round panel test than the flexural test. It was also concluded that the use of 5lb/cy fiber dosage has the best value-added benefit to the mix.

01084478

08-2305

English

16p

2008

Transportation Research Board 87th Annual Meeting

DVD

Figures; Photos; References (1) ; Tables (7)

Asphalt mixtures; Concrete overlays; Concrete pavements; Fibers; Mix design; Polypropylene; Whitetopping

Pavement mixtures

Highways; Materials; I32: Concrete

Transportation Research Board Annual Meeting 2008 Paper #08-2305

TRIS, TRB

Jan 29 2008 4:40PM