Abstract
Damping properties of polymer-modified hardened cement paste (PMhcp) were studied by dynamic mechanical analysis (DMA) using self-synthesized styrene-co-butyl acrylate polymer latexes with varied glass transition temperature (Tg) and functional groups on colloidal surface. It is found that the development law of storage modulus and lag angle of the PMhcp during temperature rise is highly correlated with glass-rubber transition of polymer phase, indicating the dynamic mechanical properties of PMhcp are dominated by the polymer phase. Inherent parameters of polymer including Tg and functional groups greatly influence damping performance of PMhcp. PMhcp containing polymers with lower Tg and highly carboxylated colloidal surface displays higher damping ability. In addition, a subsequent heat treatment further enhances the damping performance of PMhcp. It is believed that higher interfacial bonding between polymer phase and cement hydrates facilitates energy transfer between the two phases during cyclic deformation and thus is beneficial for improving damping properties of PMhcp.
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