Damping Properties of SBR Modified Cement Pastes

Earthquakes, wind buffeting, ocean waves, noise vibration and explosion are all harmful to people's life. For controlling the vibrations one way is by improving the material damping capacity. Effects of improving the damping properties of cement based material by adding polymer, fiber and interfacial modification have been admitted. Whereas the relationship of the influence of the dosage of polymer to the damping functions and the changes of damping behaviors at different frequency, temperature environment have received much less attention. The main objective of this paper is to research the damping behavior of SBR modified cement pastes at different frequencies, temperatures and polymer contents by dynamic mechanical analysis Experimental results showed that the damping behaviors of low P/C ratio cement paste is close to a typical elastic cementitious material and higher P/C ratio resulted in higher damping behaviors. For a certain SBR modified cement paste, Tan delta slightly decreases with the frequency increases and a sharp peak was found at the glass transition temperature. The SEM images indicated that there was a morphological difference in the plain cement paste and SBR modified cement paste.