Evaluation of Different Mineral Filler Aggregates for Asphalt Mixtures

World Multidisciplinary Civil Engineering-Architecture-Urban Planning Symposium - WMCAUS

土木建筑工程

Wasilewska, Marta^1 ; Malaszkiewicz, Dorota^1 ; Ignatiuk, Natalia^2

Bialystok University of Technology, Wiejska 45A, Bialystok

15-351, Poland^1

BUDIMEX SA, Stawki 40, Warszawa

01-040, Poland^2

关键词: Coarse aggregates;    Filler aggregates;    Limestone filler;    Methylene blue tests;    Mineral composition;    Particle densities;    Reference material;    Stiffening effect;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/245/2/022042/pdf
DOI  :  10.1088/1757-899X/245/2/022042

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

Mineral filler aggregates play an important role in asphalt mixtures because they fill voids in paving mix and improve the cohesion of asphalt binder. Limestone powder containing over 90% of CaCO3is the most frequently used type of filler. Waste material from the production of coarse aggregate can be successfully used as a mineral filler aggregate for hot asphalt concrete mixtures as the limestone powder replacement. This paper presents the experimental results of selected properties of filler aggregates which were obtained from rocks with different mineral composition and origin. Five types of rocks were used as a source of the mineral filler aggregate: granite, gabbro, trachybasalt, quartz sandstone and rocks from postglacial deposits. Limestone filler was used in this study as the reference material. The following tests were performed: grading (air jet sieving), quality of fines according to methylene blue test, water content by drying in a ventilated oven, particle density using pyknometer method, Delta ring and ball test, Bitumen Number, fineness determined as Blaine specific surface area. Mineral filler aggregates showed significant differences when they were mixed with bitumen and stiffening effect in Delta ring and ball test was evaluated. The highest values were achieved when gabbro and granite fillers were used. Additionally, Scanning Electron Microscopy (SEM) analysis of grain shape and size was carried out. Significant differences in grain size and shape were observed. The highest non-homogeneity in size was determined for quartz sandstone, gabbro and granite filler. Their Blaine specific surface area was lower than 2800 cm2/g, while for limestone and postglacial fillers with regular and round grains it exceeded 3000 cm2/g. All examined mineral filler aggregates met requirements of Polish National Specification WT-1: 2014 and could be used in asphalt mixtures.