High Modulus Asphalt Concrete with Dolomite Aggregates

2nd International Conference on Innovative Materials, Structures and Technologies

Haritonovs, V.^1 ; Tihonovs, J.^1 ; Smirnovs, J.^2

Riga Technical University, Faculty of Building and Civil Engineering, Department of Roads and Bridges, Kalku Str. 1, Riga

LV-1658, Latvia^1

Riga Technical University, Faculty of Building and Civil Engineering, Kalku Str. 1, Riga

LV-1658, Latvia^2

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

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/96/1/012084/pdf
DOI  :  10.1088/1757-899X/96/1/012084

来源: IOP

【 摘 要 】

Dolomite is one of the most widely available sedimentary rocks in the territory of Latvia. Dolomite quarries contain about 1,000 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, its LA index (The Los Angeles abrasion test). Therefore, mostly the 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 with EN 13108-1 standard.