Rheological Properties of Mastic with the Addition of Synthetic Wax and Hydrated Lime within the Viscoelastic Region

3rd World Multidisciplinary Civil Engineering, Architecture, Urban Planning Symposium

土木建筑工程;文学

Mazurek, Grzegorz^1

Department of Transportation Engineering, Faculty of Civil Engineering and Architecture, Kielce University of Technology, al. Tysiãclecia Pastwa Polskiego 7, Kielce

25-314, Poland^1

关键词: Bituminous mixtures;    Dynamic shear modulus;    Dynamic shear rheometer;    Experiment design;    Low temperature cracking;    Rheological property;    Test temperatures;    Viscoelastic properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/471/3/032035/pdf
DOI  :  10.1088/1757-899X/471/3/032035

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

Mastic has a significant effect on the properties of bituminous mixtures and acts as a real binder. It determines the resistance of the asphalt mixture to the formation of plastic deformation, the sensitivity to the effects of water and the low temperature cracking as well. In the article, advanced rheological research using the mastic with virgin bitumen 50/70 was presented. Mastic has been enriched by addition of the hydrated lime together with synthetic wax modified bitumen. The experiment design was based on the Box-Behnken plan. This experiment plan consisted of three controlled factors: the amount of synthetic wax, the amount of hydrated lime and the amount of filler in the asphalt mastic composition. The work highlights the interaction between synthetic wax and the amount of hydrated lime. The assessment of the influence of controlled factors was determined within the viscoelastic region performed by means of a dynamic shear rheometer. The experiment used the determination of viscoelastic properties of the mastic, i.e. complex dynamic viscosity η ∗, dynamic shear modulus G∗, phase shift angle δ at temperatures 40 °C, 60 °C and 80 °C. In addition, the influence of controlled factors was determined using MSCR tests in the 100 Pa and 3200 Pa range. As a result, creep compliance and elastic recovery were determined at 60 °C. The tests showed a diversified increase in the stiffness of the asphalt mastic with wax and hydrated lime additive, at given high test temperatures, in relation to the mastic with a traditional filler. It should be noted that the presence of crystallites of a synthetic wax also caused a significant increase in the stiffness of the mastic.