Measurements of Moisture Suction and Diffusion Coefficient in Hot-Mix Asphalt and Their Relationships to Moisture Damage

Abstract

A procedure for measuring the total suction in hot-mix asphalt (HMA) mixes was developed in this study. Suction measurements were related to physical and chemical properties of HMA that influence moisture damage. This procedure was achieved in two phases. In the first phase, the total suction was measured in HMA specimens with different types of aggregates and with different air void distributions and aggregate gradations. The results showed that the drying test using a 60°C temperature-controlled room was the most appropriate setup for measuring the total suction in HMA with thermocouple psychrometers. The characteristics of suction–moisture content curves were found to be related to the air void distribution in HMA and to the resistance of the mixtures to moisture damage. In the second phase, total suction was measured in sand asphalt specimens. These specimens had different combinations of aggregates and binders that exhibited different field resistances to moisture damage. The suction measurements were used to calculate the moisture diffusion coefficient. The results revealed that mixes with a higher diffusion coefficient are those that had poor resistance to moisture damage.

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References

Fredlund

D. G.

and Rahardjo

. Soil Mechanics for Unsaturated Soils. John Wiley & Sons, Inc., New York, 1993.

Bulut

Lytton

R. L.

and Wray

W. K.

. Soil Suction Measurement by Filter Paper. Geotechnical Special Publication 115. American Society of Civil Engineers, New York, 2001.

Bulut

and Wray

W. K.

. Free Energy of Water—Suction—in Filter Papers. Geotechnical Testing Journal, Vol. 28, No. 4 2005, pp. 355–364.

Scullion

and Saarenketo

. Using Suction and Dielectric Measurements as Performance Indicators for Aggregate Base Materials. In Transportation Research Record 1577, TRB, National Research Council, Washington, D.C., 1997, pp. 37–44.

Syed

Scullion

and Randolph

R. B.

. Tube Suction Test for Evaluating Aggregate Base Material in Frost- and Moisture-Susceptible Environments. In Transportation Research Record: Journal of the Transportation Research Board, No. 1709, TRB, National Research Council, Washington, D.C., 2000, pp. 78–90.

Lytton

R. L.

Adhesive Fracture in Asphalt Concrete Mixtures. In Asphalt Technology Handbook ( Youtcheff

, ed.), Marcel Dekker, Monticello, N.Y., 2004.

Kim

Y. R.

Little

D. N.

and Lytton

R. L.

. Effects of Moisture Damage on Material Properties and Fatigue Resistance of Asphalt Mixtures. In Transportation Research Record: Journal of the Transportation Research Board, No. 1891, Transportation Research Board of the National Academies, Washington, D.C., 2004, pp. 48–54.

Bhasin

Masad

Little

and Lytton

. Limits on Adhesive Bond Energy for Improved Resistance of Hot-Mix Asphalt to Moisture Damage. In Transportation Research Record: Journal of the Transportation Research Board, No. 1970, Transportation Research Board of the National Academies, Washington, D.C., 2006, pp. 3–13.

Masad

Castelblanco

and Birgisson

. HMA Moisture Damage as a Function of Air Void Size Distribution, Pore Pressure and Bond Energy. Journal of Testing and Evaluation, Vol. 34, No. 1 2006, pp. 15–23.

10.

Kringos

and Scarpas

. Raveling of Asphaltic Mixes Due to Water Damage: Computational Identification of Controlling Parameters. In Transportation Research Record: Journal of the Transportation Research Board, No. 1929, Transportation Research Board of the National Academies, Washington, D.C., 2005, pp. 79–87.

11.

Edlefsen

N. E.

and Anderson

A. B. C.

. Thermodynamics of Soil Moisture. Hilgardia, Vol. 15, 1943, pp. 31–298.

12.

Richards

B. G.

Measurements of the Free Energy of Soil Moisture by the Psychrometric Technique Using Thermistors. In Moisture Equilibria and Moisture Changes in Soils Beneath Covered Areas: A Symposium, Butterworths, Australia, 1965, pp. 39–46.

13.

Kassem

E. A.

Measurements of Moisture Suction in Hot Mix Asphalt Mixes. M. Sc. thesis. Department of Civil Engineering, Texas A&M University, College Station, 2005.

14.

Bulut

Aubeny

C. P.

and Lytton

R. L.

. Unsaturated Soil Diffusivity Measurements. Presented at International Symposium on Advanced Experimental Unsaturated Soil Mechanics, Trento, Italy, June 27–29, 2005.

15.

Bulut

and Leong

E. C.

. Indirect Measurement of Suction. Journal of Geotechnical and Geological Engineering, Special Issue on Laboratory and Field Testing of Unsaturated Soils, 2006 (forthcoming).

16.

Birgisson

Roque

and Page

. Evaluation of Water Damage Using Hot Mix Asphalt Fracture Mechanics. Journal of the Association of the Asphalt Paving Technologists, Vol. 72, 2003, pp. 424–462.

17.

Birgisson

Roque

and Page

G. C.

. Performance-Based Fracture Criterion for the Evaluation of Moisture Susceptibility in Hot-Mix Asphalt. In Transportation Research Record: Journal of the Transportation Research Board, No. 1891, Transportation Research Board of the National Academies, Washington, D.C., 2004, pp. 55–61.

18.

Mitchell

P. W.

The Structural Analysis of Footings on Expansive Soil. Research Report No. 1. K. W. G. Smith and Assoc. Pty. Ltd., Newton, South Australia, 1979.

19.

Zollinger

C. J.

Application of Surface Energy Measurements to Evaluate Moisture Susceptibility of Asphalt and Aggregates. M. Sc. thesis. Department of Civil Engineering, Texas A&M University, College Station, 2005.

20.

Laliberte

G. E.

and Corey

A. T.

. Hydraulic Properties of Disturbed and Undisturbed Soils. In Permeability and Capillary of Soils, ASTM, Philadelphia, Pa., 1967, pp. 56–71.