Effects of styrene-acrylate emulsion on the damping ability and hydration of cement matrix

Cement mortar of high damping ability has been maded by using styrene-acrylate emulsion as an admixture. The addition of styrene-acrylate emulsion causes the loss tangent of plain cement mortar to increase at all temperature (-30-30°C) and frequencies (0.1-2.0 Hz), and the loss tangent increase is particularly large at 15-30°C, even up to 0.25 at 30°C and 0.5Hz due to the glass temperature of styrene-acrylate emulsion, although the storage modulus of cement mortar with this admixture decreases at all temperatures and frequencies, however, for the loss modulus, which serves as an comprehensive figure-of-merit for the vibration reduction ability, styrene-acrylate emulsion may dramatically increase it. The X-ray diffraction (XRD) and infrared (IR) spectrum analysis have provided evidence that styrene-acrylate decelerates the hydration of cement paste.