Approach by zeta-potential measurement on the surface change of hydrating C3S |
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Authors: | K Suzuki T Nichikawa K Kato H Hayashi S Ito |
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Affiliation: | Nagoya Institute of Technology, Magoya, Japan |
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Abstract: | The adsorption of Ca2+ on C3S surface and the formation of C-S-H in the induction period of C3S hydration were investigated by measuring zeta-potential, heat evolution change and by analyzing dissolved ions. Within 20 minutes, the dissolution of Ca2+ and silicate ions and the adsorption of Ca2+ on the surface of C3S were alternately repeated. In the induction period (20 50 minutes), Ca2+ was adsorbed fairly strongly on C3S surface giving positive zeta-potentials and the dissolution stopped for a time. In the hydration between 60 and 140 minutes, the C-S-H gel proceeded to crystallize and Ca2+ began to dissolve again, giving negative zeta-potentials by Si-O?. After 140 minutes, the second evolution was caused by the crystallization of C-S-H and Ca(OH)2. |
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