The effects of adsorption of superplasticizers on the surface of cement |
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| Affiliation: | 1. Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, International Innovation Center for Green & Advanced Civil Engineering Materials of Hunan Province, Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education, College of Civil Engineering, Hunan University, Changsha 410082, China;2. Department of Civil Engineering, University of British Columbia, Vancouver, BC V6T1Z4, Canada;1. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong;2. Shanghai Key Laboratory of New Technology Research on Engineering Structure, Shanghai Research Institute of Building Science, Shanghai, China |
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| Abstract: | The effects of different types of superplasticizers in cement-water systems were investigated by microelectrophoresis and UV-absorption techniques. The purpose of the experiments was to investigate any differences in the magnitude of the Zeta Potential (ZP) and in the amount of superplasticizer adsorbed by using sulfonated polymers of different type, naphthalene, melamine, and polystyrene, with the respective molecular weights, MW=15,000 g/mole, MW=19,500 g/mole and MW=70,000 g/mole. The results show that the superplasticizer with the largest molecular weight gives the largest negative ZP, and is therefore concluded to have a higher dispersing capability. UV-absorption results have shown that the superplasticizer with the smallest molecular weight is the most adsorbed. That the polymer which is the least adsorbed gives the highest negative ZP can be expleined by the diffuse double-layer theory and a model is presented. |
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