Investigation of Workability, Strength and Durability Properties of Mortars Produced with Cement-Based Binders Containing Sepiolite

Mahmut Aytekin; Hadaan Pehlivan

Makale detayları

Investigation of Workability, Strength and Durability Properties of Mortars Produced with Cement-Based Binders Containing Sepiolite

Yazarlar:

Mahmut Aytekin | Hadaan Pehlivan

Yayıncı:

Giresun University

Ana Başlıklar:

Yapı Malzemeleri

Dergi:

Karadeniz Fen Bilimleri Dergisi Vol.15 Issue 1, pp.448-469

Belge Tipi:

Makale

Yayın Tarihi:

3/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001342324

pISSN:

2564-7377

Anahtar kelimeler:

Özet:

 In cement based binders, calcium hydroxide formed as a result of the reaction of cement and water protects the reinforcement against environmental effects thanks to its high alkaline property. Since ionic conductivity is very low in cementitious mixtures, the formation of corrosive cells is limited on the reinforcement surface that is not in contact with sea water. In this study, reinforced and unreinforced cementitious mixtures were produced by replacing sepiolite with cement at rates of 0, 2.5, 5, 7.5, 10, 12.5 and 15 by weight. Consistency, setting times and volumetric expansion were carried out on cement pastes; physical and mechanical properties were carried out on 4040160 mm prismatic cement mortars; corrosion tests were carried out on Ø10 reinforced Ø50 x100 mm cylinder cement mortars. Corrosion measurements were taken on certain days of cylinder cement mortars kept in 3.5 NaCl solution for 145 days by the three-electrode measurement method. As a result, the shortest setting start and end times were found in cement pastes with 5 sepiolite addition; It was determined that with increasing sepiolite replacement, water absorption amounts in cement mortar samples increased, bulk densities decreased; mechanical properties of cement mortars without additive and with 2.5 sepiolite additive were similar to each other and also provided the best protection against reinforcement corrosion.

 In cement based binders, calcium hydroxide formed as a result of the reaction of cement and water protects the reinforcement against environmental effects thanks to its high alkaline property. Since ionic conductivity is very low in cementitious mixtures, the formation of corrosive cells is limited on the reinforcement surface that is not in contact with sea water. In this study, reinforced and unreinforced cementitious mixtures were produced by replacing sepiolite with cement at rates of 0, 2.5, 5, 7.5, 10, 12.5 and 15 by weight. Consistency, setting times and volumetric expansion were carried out on cement pastes; physical and mechanical properties were carried out on 4040160 mm prismatic cement mortars; corrosion tests were carried out on Ø10 reinforced Ø50 x100 mm cylinder cement mortars. Corrosion measurements were taken on certain days of cylinder cement mortars kept in 3.5 NaCl solution for 145 days by the three-electrode measurement method. As a result, the shortest setting start and end times were found in cement pastes with 5 sepiolite addition; It was determined that with increasing sepiolite replacement, water absorption amounts in cement mortar samples increased, bulk densities decreased; mechanical properties of cement mortars without additive and with 2.5 sepiolite additive were similar to each other and also provided the best protection against reinforcement corrosion.

 In cement based binders, calcium hydroxide formed as a result of the reaction of cement and water protects the reinforcement against environmental effects thanks to its high alkaline property. Since ionic conductivity is very low in cementitious mixtures, the formation of corrosive cells is limited on the reinforcement surface that is not in contact with sea water. In this study, reinforced and unreinforced cementitious mixtures were produced by replacing sepiolite with cement at rates of 0, 2.5, 5, 7.5, 10, 12.5 and 15 by weight. Consistency, setting times and volumetric expansion were carried out on cement pastes; physical and mechanical properties were carried out on 4040160 mm prismatic cement mortars; corrosion tests were carried out on Ø10 reinforced Ø50 x100 mm cylinder cement mortars. Corrosion measurements were taken on certain days of cylinder cement mortars kept in 3.5 NaCl solution for 145 days by the three-electrode measurement method. As a result, the shortest setting start and end times were found in cement pastes with 5 sepiolite addition; It was determined that with increasing sepiolite replacement, water absorption amounts in cement mortar samples increased, bulk densities decreased; mechanical properties of cement mortars without additive and with 2.5 sepiolite additive were similar to each other and also provided the best protection against reinforcement corrosion.

 Çimento esaslı bağlayıcılarda çimento ve suyun reaksiyonu sonucu oluşan kalsiyum hidroksit yüksek alkali özelliği sayesinde donatıyı çevresel etkilere karşı korumaktadır. Çimentolu karışımlarda, iyonik iletkenlik çok düşük olduğu için, deniz suyu ile teması olmayan donatı yüzeyinde, korozif hücrelerin oluşumu kısıtlı olmaktadır. Bu çalışmada sepiyolit, çimentoya ağırlıkça 0, 2.5, 5, 7.5, 10, 12.5 ve 15 oranında ikame edilerek donatılı ve donatısız çimentolu karışımlar üretilmiştir. Çimento hamurlarına kıvam, priz süreleri ve hacim genleşmesi; 4040160 mm prizmatik çimento harçlarına fiziksel ve mekanik özellik; Ø10 donatılı Ø50 x100 mm silindir çimento harçlarına korozyon deneyleri yapılmıştır. 3.5 NaCl çözeltisi içerisinde 145 gün bekletilen silindir çimento harçlarının üç elektrotlu ölçüm yöntemi ile belirli günlerde korozyon ölçümleri alınmıştır. Sonuç olarak 5 sepiyolit katkılı çimento hamurlarında priz başlangıç ve bitiş süresinin en kısa olduğu; sepiyolit ikamesinin artmasıyla çimento harç numunelerinde su emme miktarlarının arttığı, bulk yoğunluklarının azaldığı; katkısız ve 2,5 sepiyolit katkılı çimento harçlarının mekanik özelliklerinin birbirine benzer olduğu aynı zamanda korozyona karşı en yüksek direnci gösterdiği belirlenmiştir.

Makale detayları

Investigation of Workability, Strength and Durability Properties of Mortars Produced with Cement-Based Binders Containing Sepiolite

Yazarlar:

Mahmut Aytekin | Hadaan Pehlivan

Yayıncı:

Giresun University

Ana Başlıklar:

Yapı Malzemeleri

Dergi:

Karadeniz Fen Bilimleri Dergisi Vol.15 Issue 1, pp.448-469

Belge Tipi:

Makale

Yayın Tarihi:

3/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001342324

pISSN:

2564-7377

Cement

Sepiolite

Reinforcement

CorrosionÇimento

Sepiyolit

Donatı

Korozyon

Sayı

Makale detayları

Yazarlar: Mahmut Aytekin | Hadaan Pehlivan

Yayıncı: Giresun University

Ana Başlıklar: Yapı Malzemeleri

Dergi: Karadeniz Fen Bilimleri Dergisi Vol.15 Issue 1, pp.448-469

Belge Tipi: Makale

Yayın Tarihi: 3/2025

Belge Dili: Türkçe

Document ID (Org No.): 2001342324

pISSN: 2564-7377

Sayı

Yazarlar:

Mahmut Aytekin | Hadaan Pehlivan

Yayıncı:

Giresun University

Ana Başlıklar:

Yapı Malzemeleri

Dergi:

Karadeniz Fen Bilimleri Dergisi Vol.15 Issue 1, pp.448-469

Belge Tipi:

Makale

Yayın Tarihi:

3/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001342324

pISSN:

2564-7377