In this paper, styrene butadiene rubber (SBR) was utilized to improve the low-temperature performance of Buton-rock asphalt (BRA)-modified asphalt. Firstly, the optimum content of SBR modif...

Laboratory Investigation for the Road Performance of Asphalt Mixtures Modified by Rock Asphalt–Styrene Butadiene Rubber

Recycling fish scale powder in improving the performance of asphalt: A sustainable utilization of fish scale waste in asphalt

Standardization to evaluate the lasting capacity of rubberized asphalt mixtures with different testing approaches

Damage evolution of asphalt mixture under freeze-thaw cyclic loading from a mechanical perspective

Influence of ethylene-vinyl acetate on the performance improvements of low-density polyethylene-modified bitumen

Unified characterizing fatigue performance of rubberized asphalt mixtures subjected to different loading modes

Although shear strength plays an important role in the performance of asphalt mixtures, it is still not adopted as a control index in traditional asphalt pavement structure design. Among most shear strength tests, the shape of specimen damage in the uniaxial penetration test and circle shear test proved to be more accurate in reflecting the practical asphalt pavement damage shape. To explore the impact of material composition on the shear performance of asphalt mixtures under different test conditions, uniaxial penetration tests, circle shear tests, and unconfined compressive strength tests were conducted to evaluate shear strength with considerations of asphalt mixture composition (asphalt binders, aggregate, and mineral powder). Experimental results demonstrate that the SBS-modified asphalt mixtures have a higher shear strength than conventional 70# asphalt mixtures, and the shear performance of mixtures is positively correlated with softening point of asphalt binder. For the same gradation, the shear strength of asphalt mixtures increases with the asphalt-aggregate ratio first, then decreases with the ratio increases. The shear performance of mixtures can be increased by properly increasing the maximum nominal aggregate size and reasonably adjusting the aggregate gradation. Mineral powder replaced by 20% cement or 10% PSP (phosphorus slag powder) can also satisfy the requirement. Both coarse aggregate and fine aggregate containing silt impact the shear performance of mixtures; it is recommended that the silt content of coarse aggregates is controlled within 3%, and that of fine aggregate should be within 1%.

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Chao Zhang

Papers

Unified characterizing fatigue performance of rubberized asphalt mixtures subjected to different loading modes

Evaluation of Material Composition on the Shear Performance of Asphalt Mixtures under Different Test Conditions