Abstract
Three vinyl acetate ethylene (VAE) latices and incorporated polyvinyl alcohol (PVOH) were investigated. Two of the VAE latices were stabilized by PVOH, while the third was stabilized with an anionic surfactant. The influence of VAE and PVOH on cement hydration was studied by means of isothermal heat flow calorimetry, ICP-OES and in situ XRD measurement. All of the latices prolonged the induction period with an increase in the polymer/cement ratio, whereas the latex stabilized by PVOH hardly influenced the hydration of the silicate phase. Instead, a strong secondary exothermic peak was observed. Based on the in situ XRD analysis, the peak was attributed to the rapid formation of ettringite. Furthermore, the concentration of SO42− in the pore solution was found to have reduced in the presence of polymers in the first hours of the hydration.
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Acknowledgements
Yu Jin gratefully acknowledges the scholarship provided by DAAD (German academic exchange service). The authors also greatly appreciate Dr. Wolf-Dieter Hergeth for the advices, Dr. Ulf Dietrich for the synthesis of model latices and Dr. Ingo Müller for the helpful discussions.
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Jin, Y., Stephan, D. Hydration kinetics of Portland cement in the presence of vinyl acetate ethylene latex stabilized with polyvinyl alcohol. J Mater Sci 53, 7417–7430 (2018). https://doi.org/10.1007/s10853-018-2074-1
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DOI: https://doi.org/10.1007/s10853-018-2074-1