Effect of polymer latexes with cleaned serum on the phase development of hydrating cement pastes |
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| Affiliation: | 1. Department of Civil Engineering, Tsinghua University, Beijing 100084, China;2. Development Dispersions & Pigments, EDG/EK–H 201, BASF SE, Ludwigshafen 67056, Germany;3. Mineralogy, Geozentrum Nordbayern, University of Erlangen-Nuernberg, D-91054 Erlangen, Germany;1. The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education and Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Science, Northwestern Polytechnical University, Xi''an 710072, PR China;2. Northwestern Polytechnical University–East China University of Science and Technology Combined Research Institute of New High Speed Railway Materials, PR China |
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| Abstract: | The effects of polymer latexes on cement hydration were investigated by the combination of isothermal calorimetry, in-situ XRD and Cryo-SEM. Two model latexes with varied amounts of anionic charges were used for measurements after cleaned by dialysis to remove the serum components. This study confirms that in-situ XRD technique can be successfully adapted to hydrating cementitious systems in the presences of polymer latexes to quantitatively follow evolution of mineral phases involved in cement hydration. Results show that both polymers retard aluminate reaction and depress silicate reaction, by delaying the dissolution of C3A, anhydrite and gypsum and consequently the formation of ettringite, and reducing the dissolution of C3S and the formation of C-S-H. The anionic colloidal polymers exhibit more pronounced retardation effect on aluminate reaction than on silicate reaction due to stronger electrostatic interaction between the polymer particles and the positively charged aluminate phases. The more charged latex shows stronger retardation. |
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