Relationship Between The Time Dependent Zeta Potential of Pure C3S Phase and Its SEtting Behavior

Öz

In this work, the zeta potential measurements (ZP) of pure clinker phase, C3S (3CaO.2SiO2), of ordinary portland cement (OPC) depending on time were carried out under the real conditions. That is, the used water/cement (w/c) ratio is 0.5 in this study and it is the same with the ratios used in the practical applications. The obtained ZP curves were discussed under the light of the time dependent calcium (Ca+2) concentration released into water from the solid phase, time dependent suspension pH, vicat test, and heat of hydratation by Microcalorimeter test results. As a result, the relationship between the time dependent ZP of C3S and its setting behavior, especially considering beginning and ending of setting times, is not possible under the real w/c ratios. This is because the ZP measurement of the C3S particle is impossible after a certain time due to solidifying. However, there is weak relation between the heat of hydratation and time-dependent ZP data

Anahtar Kelimeler

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Saf C3S Fazının Zamana Bağlı Zeta Potansiyel (ZP) Değişimi İle Hidratasyonu Davranışı (Prizlenme) Arasındaki İlişki

Öz

Bu çalışmada, gerçek şartlar altında (su/çimento(w/c) oranı: 0.5) normal portland çimentosunun (PÇ) saf C3S(3CaO.2SiO2) klinker fazının zamana bağlı zeta potansiyel (ZP) ölçümleri yapılmıştır. Elde edilen ZP eğrileri, zamana bağlı olarak çimento pastasından çözeltiye geçen Ca+2 iyon konsantrasyonu, zamana pH değişimi, zamana bağlı iletkenlik ölçümleri, vicat testi ve mikrokalorimetre ile hidratasyon ısısı verileri ışığında tartışılmıştır. Sonuç olarak, pratikte uygulanan w/c oranlarında çimentonun zamana bağlı zeta potansiyel (ZP) değişimi ile prizlenme davranışı arasında (özellikle priz başı süresi açısından) bir ilişki kurmak mümkün değildir. Çünkü belirli bir süreden sonra çimento pastasının katılaşması sebebiyle ZP ölçümü yapabilmek mümkün olmamıştır. Bununla beraber hidratasyon ısısı verileriyle zamana bağlı ZP verileri arasında zayıf da olsa bir ilişki mevcuttur.

Anahtar Kelimeler

• Çimento, Alit, Zeta potansiyel, Hidratasyon ısısı, Prizlenme

Kaynakça

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