Investigation of Stone Matrix Asphalt Mortars

Abstract

The use of stone matrix asphalt (SMA) has continued to increase in the United States since its initial application in 1991. This preference for SMA has been linked to its ability to withstand heavy traffic without rutting. The antirutting capability of SMA is normally accredited to the presence of a stone-on-stone aggregate skeleton in the mixture. However, the mortar in an SMA mixture is also important. The mortar is composed of fine aggregate, filler, asphalt cement, and a stabilizing additive. Work to characterize SMA mortars is detailed. For testing purposes, the mortar was broken into separate phases, total mortar and fine mortar. The fine mortar was tested using the Superior Performing Asphalt Pavements system (Superpave) binder tests. The total mortar was tested using the bending beam rheometer, resilient modulus, indirect tensile test, and Brookfield vis-cometer. The results indicate that the fine and total mortars are closely related. In addition, it was determined that at least some of the Superpave tests can be used to characterize SMA mortars. It is recommended that further testing be completed and specification criteria be established for the mortar.

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References

Zusätzliche Technische Vertragsbedingungen und Richtlinien für den Bau von Farbahndeckenaus Asphalt, Section 4: Splittmastixasphalt (in German). Der Bündeminster für Verkehr 1984, revised ed., 1990.

Splittmastixasphalt (in German). Deutscher Asphaltverband, Jan. 1991.

Bukowski

J. R.

The Future of SMA in America. Asphalt, Asphalt Institute, Lexington, Ky., Winter 1992–1993.

Milster

Herstellen und von Splittmastixasphalt—ein Erfahrungsbericht. Bitumen, ARBIT, Jan. 1993.

McDaniel

Stone Mastic Asphalt. Initial Report, Project Mo91-05. Missouri Highway and Transportation Department, 1992.

Scherocman

J. A.

, and Schütz

O. W.

. The Construction and Performance of Polymer Modified Asphalt Concrete Pavements. Proc., 7th International Conference on Asphalt Pavements, undated.

Bukowski

J. R.

SMA in America. Presented at the 72nd Annual Meeting of the Transportation Research Board, Washington, D.C., Jan. 1993.

Bukowski

J. R.

Stone Mastic Asphalt Test and Evaluation Project No. 18. Office of Technology Applications, FHWA, U.S. Department of Transportation, Washington, D.C., Dec. 1991.

Guidelines for Materials, Production, and Placement of Stone Matrix Asphalt (SMA). Report IS-118, National Asphalt Pavement Association, Lanham, Md., Aug. 1994.

10.

Bellin

Use of Stone Mastic Asphalt in Germany—State of the Art. Paper presented to Transportation Research Board Committee A2FO2, Washington, D.C., Jan. 1992.

11.

Scherocman

J. A.

Construction of Stone Mastic Asphalt Test Sections in the U.S. Journal of the Association of Asphalt Paving Technologist, Vol. 61, Feb. 1992, p. 642.

12.

Stone Mastic Asphalt, Route 1–70, Callaway County, Construction Phase Report. Report Mo 93-01, Missouri Highway and Transportation Department, 1994.

13.

Walsh

I. D.

Stone Mastic Asphalt Wearing Course. Clause 995 AK, Kent County Council Specification, Nov. 1993.

14.

Reinke

Laboratory Investigation into the Impact of Polymer Type, Polymer Concentration, and Aggregate Gradation of the Properties of Stone Matrix Mixes. Journal of the Association of Asphalt Paving Technologists, Vol. 62, March 1992, p. 314.

15.

Multigrade, Asphalt, Multi-Contender for Large Aggregate, Surface Course and SMA Mixes. Asphalt Contractor, Jan. 1993, p. 22.

16.

Kriech

A. J.

Stone Matrix Pavements Require Special Technique. Asphalt Contractor, Feb. 1993, p. 22.

17.

Haddock

J. E.

, Liljedahl

, and Kriech

A. J.

. Stone Matrix Asphalt in Indiana. Paper presented to Transportation Research Board Committee A2FO2, Washington, D.C., Jan. 1993.

18.

Stuart

K. D.

Stone Mastic Asphalt (SMA) Mixture Design. Report FHWA-RD-92-006. FHWA, U.S. Department of Transportation Washington, D.C., March 1992.

19.

Brown

E. R.

, and Mallick

R. B.

. Stone Matrix Asphalt—Properties Related to Mixture Design (Draft). National Center for Asphalt Technology, Auburn, Ala., Sept. 1994.

20.

Harders

Effect of Mortar Stabilizers in Split-Mastic Asphalts. Proc., 5th Eurobitume Congress, Vol. 18, 1993, p. 606.

21.

Richter

Verleichende Untersuchungen an stabilisierenden Zusätzen für Splittmanstixasphalt. Bitumen, Feb. 1991, p. 69.

22.

Schroder

, and Kluge

H.-J.

. Experiences with SMA. Bitumen, April 1992.

23.

Serfass

J.-P.

, and Samanos

. Stone Mastic Asphalt for Very Thin Wearing Courses. Presented at the 71st Annual Meeting of the Transportation Research Board, Washington, D.C., Jan. 1992.