Abstract
Cement asphalt mortar (CA) is mainly applied in track system of high-speed railways for vibration attenuation. The impact on dynamics performance of CA with the admixture of rubber powder was studied. The beam specimen made of CA was manufactured for analyzing its vibration frequency and damping characteristics by free attenuation vibration tests. Results showed that there was no big change for fundamental frequency after admixture of rubber powder. However, high order frequency and structural damping increased with the increase of admixture amount. Damping ratio of CA was increased by admixing rubber powder, which can be better for energy absorption and vibration attenuation.
Highlights
Cement asphalt mortar (CA) is the key engineering material in the slab track system of high-speed railways
The vibration attenuation function was improved by admixing rubber powder into CA and the CA beam specimen was applied to evaluate the vibration frequency and damping characteristics by free attenuation vibration tests
Maximal change is only 3.9% in first order frequency which indicates that rubber powder in different thick degrees have little effect on first order frequency
Summary
Cement asphalt mortar (CA) is the key engineering material in the slab track system of high-speed railways. It is a kind of inorganicorganic composite material consisting of Portland cement, asphalt emulsion, water, fine aggregates, and other admixtures. It is a semi-rigid composite material of which, the matrix is formed by cement hydration and emulsified asphalt breaking. Rubber powder was added into raw materials instead of the same mass asphalt to make sure the total mass of raw materials is a constant. Ratio for total mass of asphalt and rubber to cement is 0.22, rubber instead of asphalt with the same mass. b Water in the asphalt emulsion is counted into the calculation of W/C
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