Full-Scale Experiment on Foam Bitumen Pavements in an Accelerated Testing Facility

Abstract

Foam bitumen stabilization is a viable alternative for reducing aggregate consumption in New Zealand. An accelerated full-scale experiment on foam bitumen pavements was conducted in the Canterbury Accelerated Pavement Testing Indoor Facility as part of a Transit New Zealand research project to study the effects of foam bitumen on unbound granular materials. Six pavement sections were tested. Three were constructed with foam bitumen contents of 1.2%, 1.4%, and 2.8% and with a common active filler content of 1.0% cement. Two more pavements were constructed with adding cement only (1.0%) and foam bitumen only (2.2%). In addition, one control section with the untreated unbound material was tested. Strains were collected with a three-dimension Emu soil strain system installed in each pavement section. Results showed that surface deflections decreased at sections with higher bitumen contents. After the application of 5,710,000 equivalent standard axles, the control section and all sections that had been stabilized with cement only and bitumen only showed large amounts of rutting. Conversely, little rutting was observed in the three sections stabilized with 2.2% foam bitumen and 1.0% cement. Water was introduced into these three pavements with additional accelerated loading; this caused the section with the lowest foam bitumen content to fail. These results showed that foam bitumen and cement had a significant effect on improving the performance of the materials studied. Material samples taken for indirect tensile strength (ITS) and repeat load triaxial (RLT) for laboratory tests showed that the ITS test was a good predictor of the pavement performance and produced a clear trend, although RLT results were not conclusive.

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References

Compton

The Dawn of a New Stone Age for Auckland. In NZGS Geotechnical Symposium. New Zealand Geotechnical Society, Auckland, 1998.

Thenoux

Gonzalez

and Dowling

. Energy Consumption Comparison for Different Asphalt Pavements Rehabilitation Techniques Used in Chile. Resources, Conservation, and Recycling, Vol. 49, No. 4, Feb. 2007, pp. 325–339.

Jenkins

K. J.

Analysis of a Pavement Layer Which Has Been Treated by Single Pass In Situ Stabilisation. University of Natal, South Africa, 1994.

Jenkins

K. J.

Mix Design Considerations for Cold and Half-Warm Bituminous Mixes with Emphasis on Foamed Bitumen. PhD thesis. University of Stellenbosch, South Africa, 1999.

Kim

Lee

and Heitzman

. Validation of a New Mix Design Procedure for Cold In-Place Recycling with Foamed Asphalt. Journal of Materials in Civil Engineering, Vol. 19, No. 11, 2007.

Jenkins

K. J.

Long

F. M.

and Ebels

L. J.

. Foamed Bitumen Mixes = Shear Performance? International Journal of Pavement Engineering, Vol. 8, 2007, pp. 85–98.

Long

Theyse

H. L.

Robroch

and Liebenberg

. Performance Models for Deep In Situ Recycled, Bitumen Stabilised Pavements under Accelerated Traffic. Proc., Ninth International Conference on Asphalt Pavements, International Society for Asphalt Pavements, Copenhagen, Denmark, 2002.

Brosseaud

Gramsammer

J.-C.

Kerzreho

J.-P.

Goacolou

and Le Bourlot

. Experimentation de la Grave-Mousse Sur le Manège de Fatigue. Extrait de la Revue Générale des Routes RGRA, No. 752, 1997.

Romanoschi

S. A.

Hossain

Gisi

and Heitzman

. Accelerated Pavement Testing Evaluation of the Structural Contribution of Full-Depth Reclamation Material Stabilized with Foamed Asphalt. In Transportation Research Record: Journal of the Transportation Research Board, No. 1896, Transportation Research Board of the National Academies, Washington, D.C., 2004, pp. 199–207.

10.

Loizos

and Papavasiliou

. Evaluation of Foamed Asphalt Cold In-Place Pavement Recycling Using Non-Destructive Techniques. Journal of Transportation Engineering, Vol. 132, No. 12 2006, pp. 970–978.

11.

Interim Technical Guidelines (TG2): The Design and Use of Foamed Bitumen Treated Materials. Asphalt Academy, Pretoria, 2002.

12.

Austroads. Pavement Design: A Guide to the Structural Design of Road Pavements. New Zealand Supplement. Sydney, Australia, 2005.

13.

Pidwerbesky

B. D.

Accelerated Dynamic Loading of Flexible Pavements at the Canterbury Accelerated Pavement Testing Indoor Facility. In Transportation Research Record 1482, TRB, National Research Council, Washington, D.C., 1995, pp. 79–86.

14.

Dawson

The E-mu System Users Manual, 2nd ed. University of Nottingham, Nottingham, United Kingdom, 1994.

15.

Steven

The Development and Verification of a Pavement Response and Performance Model for Unbound Granular Pavements. PhD thesis. University of Canterbury, Christchurch, New Zealand, 2005.

16.

Transit New Zealand Specification TNZ T/15. Draft report. Transit New Zealand, Wellington, 2007.

17.

Bituminous Mixtures. Test Methods for Hot Mix Asphalt. Soluble Binder Content. British Standards Institution, London, 2005.

18.

Ruckel

P. J.

Acott

S. M.

and Bowering

R. H.

. Foamed-Asphalt Paving Mixtures: Preparation of Design Mixes and Treatment of Test Specimens. In Transportation Research Record 911, TRB, National Research Council, Washington, D.C., 1983, pp. 88–95.

19.

Kim

and Lee

. Development of Mix Design Procedure for Cold-In Place Recycling with Foamed Asphalt. Journal of Materials in Civil Engineering, Vol. 18, No. 1, 2006.

20.

Nataatmadja

Some Characteristics of Foamed Bitumen Mixes. In Transportation Research Record: Journal of the Transportation Research Board, No. 1767, TRB, National Research Council, Washington, D.C., 2001, pp. 120–125.

21.

Saleh

M. F.

New Zealand Experience with Foam Bitumen Stabilization. In Transportation Research Record: Journal of the Transportation Research Board, No. 1868, Transportation Research Board of the National Academies, Washington, D.C., 2004, pp. 40–49.

22.

Long

and Ventura

D. G. C.

. Laboratory Testing for the HVS Test Sections on the N7 (TR11/1). CSIR Transportek Report No. CR-2003/56. Council for Scientific and Industrial Research, Pretoria, South Africa, 2004.

23.

Frobel

and Hallet

. Foamed Bitumen Stabilisation in New Zealand—Projects, Do's and Don'ts, Performance. Proc., Recycling and Stabilisation Conference, Auckland, New Zealand, 2008.

24.

Browne

Foamed Bitumen Stabilisation in New Zealand—A Performance Review and Lessons Learnt. Proc., Recycling and Stabilisation Conference, Auckland, New Zealand, 2008.