Damping characteristics of cement asphalt emulsion mortars

作者：Leiben, Zhangshen; Wang, Xiaofeng; Wang, Zhenjun^*; Yang, Bo; Tian, Yaogang; He, Rui

来源：Construction and Building Materials, 2018, 173: 201-208.

DOI：10.1016/j.conbuildmat.2018.04.012

• Cement asphalt emulsion mortars
• Asphalt-cement (a/c) ratios
• Damping characteristics
• Loss factor

Cement asphalt emulsion mortars are widely used as construction and building materials, such as high speed railways and road pavements. Their damping characteristics are very important to resist vibration and the deformation caused by repeating loads. Therefore, it is of greatly theoretical and practical significance to study the damping performance of the mortars. In this work, dynamic mechanical analysis (DMA) test was innovatively conducted to analyze damping parameters of the mortars, such as loss factor and complex modulus. The environment scanning electron microscope (ESEM) was adopted to characterize the microstructures of the mortars. The mechanical properties of the mortar were characterized by the compressive strength and flexural strength test. The results show that the addition of asphalt emulsion decreases the mechanical properties of the mortar, but the plasticity of the mortar is improved. The higher the asphalt emulsion content is, the higher the loss factor of the mortar is; and the ability of the mortar to resist deformation is stronger. With the increase of temperature, the loss modulus of the mortar decreases, but the loss factor increases. The damping performance of the mortars can be enhanced. The damping performance of cement asphalt emulsion mortar at low loading frequency is higher than that of the mortar at high loading frequency. With the increase of arc ratios, asphalt attached to surface of cement hydrates increases. The cement asphalt emulsion mortars with suitable asphalt-cement (a/c) ratios possess excellent damping performance.

• 出版日期2018-6-10
• 单位长安大学