01478924

Component

The tensile strength (St) of WMA and HMA concretes were measured by indirect tensile strength test methods at 25, 5, -5, -15, -25 and- 35℃. Fracture energy (FE) was calculated from each of the tensile strength test curves. Two WMA additives and two polymer modifiers were used to produce WMA mixtures at 135℃ in the laboratory. All asphalt concretes evaluated in this study showed St increase by temperature decreases, peaking at -15℃ or -25℃, then decreasing with further lowering of temperatures. The St values of WMA mixtures were observed to be higher than those of HMA mixtures, and, in most cases, at all low temperatures evaluated in this study. After being subjected to differential thermal contraction damage at -15 and/or -20℃, most of the WMA mixtures showed higher St than HMA mixes at severely low temperatures (-25 and -35℃). Therefore, it was concluded that the WMA mixtures had stronger tensile strength than HMA mixtures at low temperatures when prepared with the same low-temperature PG binders, even though they were produced at a relatively lower aggregate-heating temperature.

This paper was sponsored by TRB committee AFK30 Characteristics of Nonasphalt Components of Asphalt Paving Mixtures.

01470560

13-2747

English

16p

2013

Transportation Research Board 92nd Annual Meeting

Digital/other

Figures; Photos; References; Tables

Asphalt concrete; Hot mix asphalt; Low temperature; Tensile properties; Tensile strength; Tension tests; Warm mix paving mixtures

Highways; Materials; Pavements; I31: Bituminous Binders and Materials

Transportation Research Board Annual Meeting 2013 Paper #13-2747

TRIS, TRB, ATRI

Feb 5 2013 12:34PM