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                 Controlling the Expansion of Concrete in Initial Hydration Reaction using Polyethylene Glycol (PEG 35000 )
                                                                   Yaminn Lwin1#, Tint Tint Kywe2#
                                 1#Department of Chemical Engineering, Yangon Technological University, Yangon, Myanmar
                                                                          [email protected]
ABSTRACT
The aim of this investigation is to study the hydration mechanism of expansive cement with water soluble polymer. To support this objective, spray drying technology for the encapsulation and polyethylene glycol (PEG 35000) as the polymer source were used. For the polymer encapsulation process, weight ratio of polymer to cement 0.5:1 and 1:1 were used. For complete hydration of the process, water to cement (W/C) weight ratio 0.9:1 was used. For characterization, scanning electron microscope (SEM), thermal gravimetric analysis (TGA), differential thermal analysis (dTG), and X-ray diffraction (XRD) methods were used. Characterization results monitored that the coated polymer disturbed the hydration reaction between the water and cement. Polymer encapsulation process significantly changed the microstructure of concrete and delayed the time of ettringite formation and also slower the rate of reaction than non-encapsulated samples.
Keywords: Expansive cement, PEG (35000), Spray drying, Hydration, Thermal analysis