01594356

Component

In situ recycling of Reclaimed Asphalt Pavement (RAP) in highway base course can provide both environmental and economic benefits for applications such as widening, shoulder addition or Full Depth Reclamation (FDR). RAP is a well-drained granular material, however 100% RAP has low bearing strength and creeps under load. The objective of this research was to improve RAP’s strength while reducing creep to an acceptable level through blending with A-3 sand and/or by chemical stabilization. Blends of 75% RAP/25% A-3 sand were tested with combinations of asphalt emulsion and Portland cement at concentrations from 0% to 2% emulsion and 0% to 3% cement. Blends were compacted, cured, and tested for strength and deformation by the California Bearing Ratio (CBR) and modified Marshall tests. Specimens were tested dry and soaked to evaluate retained strength. One-dimensional seven-day oedometer creep tests were performed to evaluate long term deformation. RAP/A-3 blends have the potential for successful use as base course material. RAP blends with 25% sand plus combinations of asphalt emulsion and 2% - 3% Portland cement stabilizer attained acceptable CBR strength and creep. Significant variability was noted between results with different blends and stabilizing agents. Performance testing should be conducted to establish the suitability of a specific RAP/A-3 stabilized blend.

This paper was sponsored by TRB committee AFS80 Standing Committee on Cementitious Stabilization.

01584066

16-1368

English

15p

2016

Transportation Research Board 95th Annual Meeting

Digital/other

Figures; References

Asphalt emulsions; Base course (Pavements); Blends; California bearing ratio; Creep; In-place recycling; Portland cement; Reclaimed asphalt pavements; Sand; Strength of materials

Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2016 Paper #16-1368

TRIS, TRB, ATRI

Jan 12 2016 4:36PM