The purpose of this study was to assess the effect of polymer glass-transition temperature (Tg) on the mechanical property performance of mortars containing calcium sulfoaluminate (CSA) cement and vinyl acetate/ethylene dispersible polymer powder (VAE DPP). Competitive products were acquired from companies A, B, and C. Company A supplied VAE DPP with glass-transition temperatures of 64°F (18°C) and 19°F (-7°C). Company B supplied VAE DPP with glass-transition temperatures of 59°F (15°C) and 5°F (-15°C). Company C provided VAE DPP with glass-transition temperatures of 68°F (20°C) and -8°F (-22°C). It is important to note that differences in glass-transition temperature result from differences in the ratio of monomers utilized for production of the liquid polymeric dispersion during reaction polymerization, where the pertinent ratio is that of ethylene to vinyl acetate for materials germane to this study. Additionally, each utilized polymer powder may also differ in constituent components comprising the polymer powder as a result of the drying process, where constituent materials should not be limited to products typically utilized for forming protective colloids or products utilized as anti-caking agents. Each polymer was tested in a standard mortar formulation with polymer/cement ratio of 2/5 and water/cement ratio of 0.48. Experimental results show that polymer modification improves the ductile performance of CSA cement mortars. Additionally, experimental results show that the glass-transition temperature of vendor-specific products influences the mechanical property performance of polymer-modified CSA cement mortars.
Bibliographical notePublisher Copyright:
Copyright © 2014 by ASTM International.
- calcium sulfoaluminate cement
- vinyl acetate/ethylene dispersible polymer powder
ASJC Scopus subject areas
- Ceramics and Composites
- Civil and Structural Engineering
- Mechanics of Materials
- Polymers and Plastics
- Metals and Alloys
- Materials Chemistry