Water Stability of Warm-Mix High Viscosity Asphalt Mixture Based on Dynamic Water Scour Test

Abstract

Abstract: This article focused on the water stability of drained asphalt pavement. The water stability of high viscosity asphalt and warm-mix high viscosity asphalt mixtures were compared and analyzed through the immersion stability test, the Cantabro test and the freeze-thaw splitting test. A high-precision river dynamics flume test system was introduced in the research. A freeze-thaw cycle-dynamic water scour-splitting coupling test was designed to study the water stability of warm-mixed high viscosity asphalt mixtures. The mass loss rate and splitting strength ratio of three kinds of OGFC-13 high viscosity asphalt mixtures were studied under different scouring heights, scouring speeds and scouring time. The results show that the residual stability of high viscosity asphalt mixture exceeds 100%. The results of the dispersion loss of three kinds of asphalt mixtures are below 11%, and the freeze-thaw splitting strength ratio is above 95%. There is no significant difference among the test results, so the existing standard methods cannot effectively evaluate the water stability of the warm-mix high viscosity asphalt mixture. In the freeze-thaw cycle-dynamic water scour-splitting coupling test, the speed and time of scouring have the greatest impact on the water stability of the high viscosity asphalt mixture. The mass loss rate reaches 4% after 3 d of scouring and exceeds 5% after scouring at a speed of 30 L/s, and the splitting strength ratio drops below 85% at the same time. The water stability of the warm-mix high viscosity asphalt mixture can be evaluated by the freeze-thaw cycle-dynamic water scour-splitting coupling test.

Key words: water stability, dynamic water scour test, warm-mix high viscosity asphalt, drained asphalt pavement, splitting strength ratio, mass loss rate

CLC Number:

U414

HUANG Weirong, WANG Jiao, YANG Yuzhu, XIONG Kelin. Water Stability of Warm-Mix High Viscosity Asphalt Mixture Based on Dynamic Water Scour Test[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3847-3853.

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