Study of the mechanical damping behavior of SBR-modified cement pastes by dynamic mechanical analyzer

Improvement in mechanical damping of SBR-modified cement pastes had been evaluated by dynamic mechanical analyzer. Specimens were fabricated and tested under 3-point flexure clamp at frequencies of 0.5-50 Hz or temperatures of -30 to 70 A degrees C. Significant improvement in damping was observed in cementitious-SBR composite specimens when SBR latex to cement ratio was 0.12, which is hypothesized to occur due to improvements in viscosity of cement paste. Furthermore, the SBR-modified cement pastes showed a decreased damping variation tendency with an increase of frequency. They also showed a peak damping variation tendency under the effect of the glass transition temperature. Based on the three element model, mechanical parameters are calculated by fitting the dynamic modulus of SBR-modified cement pastes.