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Materiale Plastice (Mater. Plast.), Year 2009, Volume 46, Issue 3,





Stefan-Ovidiu Dima, Andrei Sarbu, Tanase Dobre, Anita-Laura Radu, Tanta-Verona Nicolescu, Anamaria Lungu Rheological Behaviour of Lightweight Concrete with Embedded EPS Beads


Abstract:
A rheological study was performed in order to appreciate the compatibility of the expanded polystyrene beads with the concrete matrix. In order to prepare homogeneous dispersions of the expanded polystyrene (EPS) in the cement paste, the EPS beads were first surface pre-treated with carboxymethylcellulose (CMC), intending to achieve the compatibility between the hydrophilic concrete matrix and the hydrophobic polystyrene beads. In this study, the mass fractions of aggregates, cement and water were maintained constantly for all the probes and it was checked the influence of two parameters: the EPS mass fraction and the CMC concentration. The study was performed with EPS mass fractions between 0.0028 - 0.0041 and with CMC - water solutions having concentrations between 0.5% - 2% (mass). The results showed that CMC can achieve the compatibility between concrete and EPS and that within a 2% CMC solution an important amount of EPS beads can be incorporated. Keywords: lightweight concrete, expanded polystyrene, concrete rheology



Issue: 2009 Volume 46, Issue 3
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