Süper akýþkanlaþtýrýcý ve trasýn çimento hidratasyonuna etkileri

Bu çalýþmada, Süper Akýþkanlaþtýrýcý katkýlý Portland çimentosu ve tras ikameli çimentonun hidratasyon geliþimleri araþtýrýlmýþtýr. Süper Akýþkanlaþtýrýcý ve tras ikamesi ile basýnç dayanýmýnda, su ihtiyacýnda, hacim genleþmesinde ve priz süresindeki meydana gelen deðiþiklikler standart çimento deneyleriyle tespit edilmiþtir. Süper Akýþkanlaþtýrýcý katkýlý Portland çimentosu ve tras ikameli çimento hamurlarýnýn hidratasyon sýrasýnda faz geliþimlerini belirlemek için X-Iþýný kýrýným yöntemi, Fourier dönüþümlü kýzýlötesi spektroskopisi ve eþ zamanlý yapýlan termal analiler gerçekleþtirilmiþtir. Ayrýca çimento hamurlarýnýn 28. hidratasyon gününde çekilen taramalý elektron mikroskobu görüntüleri ile mikro yapýlarý belirlenmiþ ve harç numuneleri dayaným testleri ile incelenmiþtir. Sonuç olarak Tras ikamesi ile su ihtiyacý ve priz süreleri artmýþ, hacim genleþme deðerleri ise standartlar arasýnda kalmýþtýr. Ayrýca meydana gelen reaksiyonlar sonucunda açýða çýkan Ca(OH)2 miktarýnýn azaldýðý tespit edilmiþtir. Tüm bu farklýlýklar harç örneklerinin basýnç dayanýmlarýný etkilemiþtir

The effects of super plasticizer and trass on the cement hydration

In this study, the development of hydration of Portland cement and trass substituted cements containing super plasticizer was investigated. The effects of super plasticizer and trass substitution on the compressive strength, water demand, volume expansion and setting time was determined by the experiments the standard cement. Cement pastes were prepared with Portland cement and trass containing super plasticizer were performed using X–Ray diffraction, Fourier transform infrared spectroscopy and Simultaneous thermal analysis in order to determine their the phases developed during the hydration. Furthermore, microstructures by scanning electron microscope 28-days of hydration of cement pastes were determined and cement mortars were examined with strength tests. As a result, with the amount of trass, water needs and setting time have increased and volume expansion values remained between the standards. Also, the amount of Ca(OH)2 which is formed during the reaction was decreased. All these differences influenced the compressive strength of mortar samples.