Abstract
Fatigue cracking is the main form of structural damage in flexible pavements. Under the action of repeated vehicular loading, deterioration of the asphalt concrete materials in pavements caused by the accumulation and growth of the micro and macro cracks gradually takes place. The results of a laboratory study evaluating the fatigue properties of hot-mix asphalt (HMA) mixtures using indirect tensile fatigue test (ITFT) were investigated in this paper. The HMA mixtures containing 0%, 35%, 70%, and 100% of recycling concrete aggregate (RCA) were plant prepared with one source of aggregate, limestone, and one type of binder, 60/70-penetration grade. In this paper, it is shown that the use of recycled concrete produced by crushing demolished concrete elements can increase the efficiency of asphalt mixes, reduce primary production costs and prevent much fullness of the recycled materials in the environment. It was found that replacing up to 100% of the virgin aggregate by RCA improved the fatigue properties of the asphalt mixtures.
Highlights
Encountered distresses such as rutting, fatigue and low temperature cracking due to increase in axle loads, traffic volume, environmental conditions and construction and design errors decrease the expected performance and service life of pavements (Sengoz, Topal 2005)
The results show that the composition and the compactive effort influence on the physical characteristics of the recycled construction and demolition waste (RCDW) aggregate
It was found that replacing up to 100% of the virgin aggregate with recycling concrete aggregate (RCA) improved the fatigue life of the asphalt mixtures
Summary
Encountered distresses such as rutting, fatigue and low temperature cracking due to increase in axle loads, traffic volume, environmental conditions and construction and design errors decrease the expected performance and service life of pavements (Sengoz, Topal 2005). Failure and fatigue cracking begin in step 1, and cracks spread to other areas and reduce pavement resistance in step 2. Various kinds of asphalt mixes with different properties show different fatigue behaviours. Several factors can be effective on the fatigue behaviour of asphalt mixtures, which include: asphalt layer thickness; type of loading (controlled strain and controlled stress); shape, frequency and period of rest in loading; properties of asphalt mixtures (asphalt content; air void; type, shape and gradation aggregates) and environmental conditions (temperature changes, wet and freezing) (Hafiang 2001)
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