The Influence of Unusual Materials as Prospective Fillers in the Hot Mix Asphalt

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

土木建筑工程

Cavalcate Ferrão, Wallace^1 ; Carlos Moizinho, Joel^2

Federal University of Rio Grande Do sul, Centro Histórico, 181 Des. Andre da Rocha Ave. Apt 901., Porto Alegre

90050-161, Brazil^1

Federal University of Roraima, DSc. in Geotechnical Engineering from University of Brasília, Department of Civil Engineering, UFRR, 2413 Ene Garcez Ave., Boa Vista

69300-000, Brazil^2

关键词: Clay bricks;    Flash points;    Glass Powder;    Grain size;    Hot mix asphalt;    Hot mix asphalt pavements;    Rice husk;    Softening points;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/245/2/022067/pdf
DOI  :  10.1088/1757-899X/245/2/022067

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

Among the factors that influence directly the durability of the asphaltic layer on pavements, the type and percentage of filler in the hot mix asphalt pavement (HMA) is a great player. The most traditional fillers, the Portland cement and the hydrated lime, are well known for resisting to weather variations and adding extra features to the hot mixtures. The glass powder, the cladding waste (gotten from clay bricks), the ashes of rice husks and laterite powder are proposed as substitutes to the traditional ones. The materials have been sieved and classified by fitting the powder on the filler grain size required by Brazilian Rules, eventually they have been tested with asphalt 50/70. The glass powder performed a Thermic Susceptibility Index (IST) of -0.69 for 5% in weight of filler and -0.75 for 10% in weight of filler, proving that this material satisfies the Brazilian specification DNIT-EM 095/2006; on the other hand, the laterite powder presented an IST of -0.61 for 5% and 0.32 for 10%. After executing the Softening Point, Penetration and Flash Point tests, it has been confirmed that the glass and laterite powder are recommended materials as potential substitutes to the Portland cement, however the first one performs better under balmy temperatures due to its negative IST; the cladding powder and the rice husks turns the mixtures too rigid and breakable on percentages close to 10%.