Beton üretimlerinde kimyasal katkı kullanımının kaçınılnaz oluşu nedeniyle katkının
etkinlik düzeyi katkı maddesinin kendisine bağlı olmakla beraber çimentonun türüne
de bağlıdır. Bu nedenle kimyasal katkı maddesi-çimento uyumu oldukça önemlidir.
Kimyasal katkıların yanı sıra mineral katkı yerdeğiştirmeli katkılı çimentoların nihai
ürün özellikleri üzerinde etkisi de tanımlı hale getirilmelidir. Bu çalışmanın amacı,
Türkiye’deki potansiyel mevcut yerel doğal marnın, alternatif bir puzolan olarak,
katkılı çimento endüstrisinde optimum değerlerle aktif kullanımını sağlayabilmek
için bilimsel veri oluşturmaktır.
Bu amaç doğrultusunda, öncelikle Sinop/Erfelek’ten elde edilen yerel doğal marnın,
termogravimetrik (TGA) analizler sonucunda karar verilen farklı kalsinasyon
sıcaklıklarında (600oC ve 800oC) kalsine edilerek, puzolanik aktiviteleri
belirlenmiştir. Ardından, kalsine marn, farklı (%10, %30 ve %50) oranlarda Portland
çimentosu ile yer değiştirilerek elde edilen katkılı çimento üzerinde fiziksel
özellikler, priz, su talebi, genleşme ve bu çimentolarla üretilen harç numuneler
üzerinde de fiziksel özellikler, ultrasonik ses geçiş hızı ve basınç dayanımı üç farklı
kökenli aynı firma ürünü süper akışkanlaştırıcı %0.8, %1.2 ve %1.5 oranlarında
kullanılarak tespit edilmiştir. Deney sonuçları, kendi aralarında ve Portland
çimentosu ile karşılaştırılmıştır.
Deneylerden elde edilen sonuçlara göre; kalsine doğal marn katkılı çimentoların
puzolanik aktivite ve çimento özelliklerinin, TS 25 ve TS EN 197-1 limit değerleri
ile uyumlu olduğu sonucuna varılmıştır. Diğer taraftan, optimum sıcaklıkla (800oC)
kalsine edilen marn katkılı çimento içeren harçların basınç dayanımları, %30 yer
değiştirme oranına kadar iyileşmektedir. Çalışmada basınç dayanımı, iç yapı (UPV)
ve çökme dikkate alınarak yapılan değerlendirmede ise %1.2 oranında
polikarboksilat ester (PCE) katkı ile %30 kalsine marn yer değiştirmenin optimum
değerler olduğu belirlenmiştir.,Since the use of chemical additives is inevitable in concrete production, the level of
activity of the additive depends on the additive itself, and also on the type of cement.
Therefore, chemical additive-cement compatibility is very important. In addition to
chemical additives, the effect of chemical additive and also blended cements
containing mineral admixture on final product properties should be defined. The aim
of this study is to create scientific data for ensure the active using with optimum
value in the blended cement industry as an alternative pozzolan of the potential
locally available natural marl in Turkey.
For this purpose, firstly local natural marl obtained from Sinop / Erfelek was
calcined at different calcination temperatures (600oC and 800oC) determined by
thermogravimetric (TGA) analyzes and pozzolanic activities were determined. And
then, the setting times, water demand, expansion and physical properties were
determined on blended cements containing calcined marl obtained by replacing
Portland cement with different (10%, 30% and 50%) ratios. Finally, the physical
properties, ultrasonic pulse velocity and compressive strength were determined on
mortar samples produced by blended cements, It was used three different type super
plasticizer with 0.8%, 1.2% and 1.5%. Experimental results were compared with
each other and with Portland cement.
According to the results obtained from the tests, pozzolanic activity and cement
properties of blended cements containing calcined natural marl are comply with limit
values of TS 25 and TS EN 197-1. On the other hand, compressive strengths of
mortars produced by blended cement containing calcined marl with optimum
temperature (800oC) were improved up to replacement ratio 30%. In the study,
considering the compressive strength, inner structure (UPV) and slump, it was
determined that 30% calcined marl replacement with 1.2% ratio polycarboxylate
ester (PCE) additive was the optimum values.
,Since the use of chemical additives is inevitable in concrete production, the level of
activity of the additive depends on the additive itself, and also on the type of cement.
Therefore, chemical additive-cement compatibility is very important. In addition to
chemical additives, the effect of chemical additive and also blended cements
containing mineral admixture on final product properties should be defined. The aim
of this study is to create scientific data for ensure the active using with optimum
value in the blended cement industry as an alternative pozzolan of the potential
locally available natural marl in Turkey.
For this purpose, firstly local natural marl obtained from Sinop / Erfelek was
calcined at different calcination temperatures (600oC and 800oC) determined by
thermogravimetric (TGA) analyzes and pozzolanic activities were determined. And
then, the setting times, water demand, expansion and physical properties were
determined on blended cements containing calcined marl obtained by replacing
Portland cement with different (10%, 30% and 50%) ratios. Finally, the physical
properties, ultrasonic pulse velocity and compressive strength were determined on
mortar samples produced by blended cements, It was used three different type super
plasticizer with 0.8%, 1.2% and 1.5%. Experimental results were compared with
each other and with Portland cement.
According to the results obtained from the tests, pozzolanic activity and cement
properties of blended cements containing calcined natural marl are comply with limit
values of TS 25 and TS EN 197-1. On the other hand, compressive strengths of
mortars produced by blended cement containing calcined marl with optimum
temperature (800oC) were improved up to replacement ratio 30%. In the study,
considering the compressive strength, inner structure (UPV) and slump, it was
determined that 30% calcined marl replacement with 1.2% ratio polycarboxylate
ester (PCE) additive was the optimum values.
