Development of high performance asphalt concrete using low quality aggregates
2013
Haritonovs, V., Riga Technical Univ. (Latvia). Dept. of Roads and Bridges | Zaumanis, M., Riga Technical Univ. (Latvia). Dept. of Roads and Bridges | Tihonovs, J., Riga Technical Univ. (Latvia). Dept. of Roads and Bridges | Smirnovs, J., Riga Technical Univ. (Latvia). Dept. of Roads and Bridges
Dolomite is one of the most available sedimentary rocks in the territory of Latvia. Dolomite quarries contain about 1000 million tons of the material. However, according to Latvian Road Specifications 2012, 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, disbase, 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 paper is to develop a high performance asphalt concrete for base and binder courses with 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 with traditional asphalt. The design of the asphalt includes a combination of empirical and performance based tests, which in laboratory circumstances allow traffic and environmental loads to be simulated. High performance ACb 16 asphalt concrete has been created using local dolomite aggregate B20/30 penetration grade bitumen. The mixtures will be specified based on fundamental properties in accordance with EN 13108-1 standard.
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