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Production of fly ash-magnesium phosphate cements
Date
2019-05-02
Author
Bilginer, Baki Aykut
Erdoğan, Sinan Turhan
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Magnezyum fosfat çimentolu (özellikle magnezyum potasyum fosfat çimentolu [MKPC]) bağlayıcılar Portland çimentosuna kısmi alternatif olabilecek sistemlerdir. MKPC yaygın olarak kalsine MgO tozu ve potasyum dihidrojen fosfat tuzu kullanılarak hazırlanır. Sulu karışımda meydana gelen asit-baz tepkimesi çok hızlı gerçekleştiğinden, bir geciktirici (boraks) de eklenir. MKPC’nin çabuk priz alma, çok hızlı dayanım kazanma ve yüksek nihai dayanım gibi geleneksel çimentolu sistemlere üstün yanları vardır. Olumsuz yanları ise çok yüksek reaksiyon ısısı ve düşük su dayanıklılığıdır. Bu çalışmada su-bağlayıcı (W/B) oranının ve magnezyum/fosfat molar oranının (M/P) MKPC hamurlarının priz süreleri ve basınç dayanımlarına etkisi değerlendirilmiştir. Priz süreleri 6 ila 10 dakika arasında değişirken 1. gün basınç dayanımları da yaklaşık 50 MPa olarak ölçülmüştür. Boraksın geciktirici etkisi de priz süresi ve basınç dayanımı gözetilerek değerlendirilmiştir. Farklı kum oranlarında harç numuneleri elde edilmiş ve 28. günde 80 MPa’a varan dayanımlar ölçülmüştür. Farklı dozajlarda uçucu kül kullanılarak basınç dayanımına etkisi değerlendirilmiştir.
Subject Keywords
Magnesium
,
Potassium
,
Setting time
,
Compressive strength
URI
https://hdl.handle.net/11511/82907
https://www.imo.org.tr/resimler/ekutuphane/pdf/18459_00_01.pdf
Conference Name
10. Uluslararası Beton Kongresi 2 - 04 Mayıs 2019
Collections
Department of Civil Engineering, Conference / Seminar
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Development of magnesium potassium phosphate cement pastes and mortars incorporating fly ash
Bilginer, Baki Aykut; Erdoğan, Sinan Turhan; Department of Civil Engineering (2018)
Magnesium potassium phosphate cements (MKPCs) have some promising properties to be considered as an alternative to ordinary Portland cement binders. The favorable properties of these cements are high early and ultimate strength. On the other hand, they have some problems like rapid setting, high heat of reaction, high cost and poor water stability. In this study, the effect of several factors like magnesium-to-phosphate molar ratio (M/P), water-to-binder ratio (W/B) and retarder (borax) content on propertie...
Effect of mixture proportioning on the strength and mineralogy of magnesium phosphate cements
Bilginer, Baki Aykut; Erdoğan, Sinan Turhan (Elsevier BV, 2021-3)
Magnesium potassium phosphate cement (MKPC) has properties advantageous over ordinary portland cement such as quick setting and rapid strength gain. Although the effect of mixture proportioning on MKPC pastes has been studied, there are conflicting reports on how calcination of magnesia, parameters like magnesium-to-phosphate ratio (M/P) and water-to-binder ratio (W/B), added materials like borax and fly ash, or the addition of sand influence mineralogy and properties like setting and strength. These factor...
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B. A. Bilginer and S. T. Erdoğan, “Production of fly ash-magnesium phosphate cements,” presented at the 10. Uluslararası Beton Kongresi 2 - 04 Mayıs 2019, Bursa, Turkey, 2019, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/82907.