Performance evaluation of high modulus asphalt concrete mixes

3rd International Conference on Competitive Materials and Technology Processes

Haritonovs, V.^1 ; Tihonovs, J.^1 ; Zaumanis, M.^1

Riga Technical University, Faculty of Building and Civil Engineering, Institute of Transportation, Department of Roads and Bridges, Riga, Latvia^1

关键词: Environmental loads;    Fundamental properties;    High modulus asphalts;    High-quality materials;    Performance evaluations;    Performance-based tests;    Practical experience;    Water-resistances;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/123/1/012055/pdf
DOI  :  10.1088/1757-899X/123/1/012055

来源: IOP

【 摘 要 】

Dolomite is one of the most available sedimentary rocks in the territory of Latvia. Dolomite quarries contain about 1000 million tons of this material. However, according to Latvian Road Specifications, this dolomite cannot be used for average and high intensity roads because of its low quality (mainly, LA index). Therefore, mostly imported magmatic rocks (granite, diabase, gabbro, basalt) or imported dolomite are used which makes asphalt expensive. However, practical experience shows that even with these high quality materials roads exhibit rutting, fatigue and thermal cracks. The aim of the research is to develop a high performance asphalt concrete for base and binder courses using only locally available aggregates. In order to achieve resistance against deformations at a high ambient temperature, a hard grade binder was used. Workability, fatigue and thermal cracking resistance, as well as sufficient water resistance is achieved by low porosity (3-5%) and higher binder content compared to traditional asphalt mixtures. The design of the asphalt includes a combination of empirical and performance based tests, which in laboratory circumstances allow simulating traffic and environmental loads. High performance AC 16 base asphalt concrete was created using local dolomite aggregate with polymer modified (PMB 10/40-65) and hard grade (B20/30) bitumen. The mixtures were specified based on fundamental properties in accordance to EN 13108-1 standard.