Effect of Water Immersion and Freeze-Thaw Cycles on Pull-off Strength of FRP Epoxy Bonded on Concrete: An experimental study

Metehan Çalış

Makale detayları

Effect of Water Immersion and Freeze-Thaw Cycles on Pull-off Strength of FRP Epoxy Bonded on Concrete: An experimental study

Yazarlar:

Metehan Çalış

Yayıncı:

Osmaniye Korkut Ata Üniversitesi

Ana Başlıklar:

Yapı Malzemeleri

Dergi:

Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi Vol.8 Issue 1, pp.82-99

Belge Tipi:

Makale

Yayın Tarihi:

1/2025

Belge Dili:

İngilizce

Document ID (Org No.):

2001330037

pISSN:

2687-3729

Anahtar kelimeler:

Özet:

 The durability and performance of Fiber Reinforced Polymer FRP composites for strengthening reinforced concrete structures under various environmental conditions are critical for their long-term efficacy. This study investigates the effects of water immersion and freeze-thaw cycles on the pull-off strength of epoxy-bonded FRP concrete slabs, simulating conditions typical for waterfront structures such as piles, beams, and decks. Concrete slabs, fabricated to EN 1766 standards, were reinforced with Basalt BFRP, Glass GFRP, and Carbon Fiber Reinforced Polymer CFRP sheets using Duratek AV21 epoxy resin. The samples were conditioned in a controlled laboratory environment 232C, 505 RH for 24 hours before being subjected to water immersion and freeze-thaw cycling tests. Pull-off tests, conducted per EN 1542, revealed cohesive failures in the concrete substrate. The average pull-off strength for the control samples was 3.26 Nmm² for concrete and 3.97 Nmm² for epoxy resin. Water immersion results showed a slight decrease in pull-off strength for CFRP and GFRP, by 9 and 2 respectively, while BFRP exhibited a 14 increase. Freeze-thaw cycling led to increased pull-off strength across all FRP types: 7 for GFRP, 7.3 for BFRP, and 3.75 for CFRP. The findings indicate that water immersion and freeze-thaw conditions have a marginal impact on the pull-off strength of FRP-reinforced concrete. Despite the environmental exposure, all test results remained above the required pull-off strength of 2.5 MPa, demonstrating the robustness of the FRP-concrete bond. The study supports the use of FRP composites for structural reinforcement in harsh environments, highlighting their resilience under adverse conditions. Further research is recommended to explore long-term performance and additional environmental factors to ensure comprehensive durability assessments of FRP-reinforced systems.

 The durability and performance of Fiber Reinforced Polymer FRP composites for strengthening reinforced concrete structures under various environmental conditions are critical for their long-term efficacy. This study investigates the effects of water immersion and freeze-thaw cycles on the pull-off strength of epoxy-bonded FRP concrete slabs, simulating conditions typical for waterfront structures such as piles, beams, and decks. Concrete slabs, fabricated to EN 1766 standards, were reinforced with Basalt BFRP, Glass GFRP, and Carbon Fiber Reinforced Polymer CFRP sheets using Duratek AV21 epoxy resin. The samples were conditioned in a controlled laboratory environment 232C, 505 RH for 24 hours before being subjected to water immersion and freeze-thaw cycling tests. Pull-off tests, conducted per EN 1542, revealed cohesive failures in the concrete substrate. The average pull-off strength for the control samples was 3.26 Nmm² for concrete and 3.97 Nmm² for epoxy resin. Water immersion results showed a slight decrease in pull-off strength for CFRP and GFRP, by 9 and 2 respectively, while BFRP exhibited a 14 increase. Freeze-thaw cycling led to increased pull-off strength across all FRP types: 7 for GFRP, 7.3 for BFRP, and 3.75 for CFRP. The findings indicate that water immersion and freeze-thaw conditions have a marginal impact on the pull-off strength of FRP-reinforced concrete. Despite the environmental exposure, all test results remained above the required pull-off strength of 2.5 MPa, demonstrating the robustness of the FRP-concrete bond. The study supports the use of FRP composites for structural reinforcement in harsh environments, highlighting their resilience under adverse conditions. Further research is recommended to explore long-term performance and additional environmental factors to ensure comprehensive durability assessments of FRP-reinforced systems.

 The durability and performance of Fiber Reinforced Polymer FRP composites for strengthening reinforced concrete structures under various environmental conditions are critical for their long-term efficacy. This study investigates the effects of water immersion and freeze-thaw cycles on the pull-off strength of epoxy-bonded FRP concrete slabs, simulating conditions typical for waterfront structures such as piles, beams, and decks. Concrete slabs, fabricated to EN 1766 standards, were reinforced with Basalt BFRP, Glass GFRP, and Carbon Fiber Reinforced Polymer CFRP sheets using Duratek AV21 epoxy resin. The samples were conditioned in a controlled laboratory environment 232C, 505 RH for 24 hours before being subjected to water immersion and freeze-thaw cycling tests. Pull-off tests, conducted per EN 1542, revealed cohesive failures in the concrete substrate. The average pull-off strength for the control samples was 3.26 Nmm² for concrete and 3.97 Nmm² for epoxy resin. Water immersion results showed a slight decrease in pull-off strength for CFRP and GFRP, by 9 and 2 respectively, while BFRP exhibited a 14 increase. Freeze-thaw cycling led to increased pull-off strength across all FRP types: 7 for GFRP, 7.3 for BFRP, and 3.75 for CFRP. The findings indicate that water immersion and freeze-thaw conditions have a marginal impact on the pull-off strength of FRP-reinforced concrete. Despite the environmental exposure, all test results remained above the required pull-off strength of 2.5 MPa, demonstrating the robustness of the FRP-concrete bond. The study supports the use of FRP composites for structural reinforcement in harsh environments, highlighting their resilience under adverse conditions. Further research is recommended to explore long-term performance and additional environmental factors to ensure comprehensive durability assessments of FRP-reinforced systems.

 Fiber Takviyeli Polimer FRP kompozitlerin çeşitli çevre koşullarında betonarme yapıların güçlendirilmesine yönelik dayanıklılığı ve performansı, uzun vadeli etkinlikleri açısından kritik öneme sahiptir. Bu çalışma, suya daldırma ve donma-çözülme döngülerinin, kazıklar, kirişler ve tabliyeler gibi kıyı yapıları için tipik koşulları simüle ederek epoksi bağlı FRP beton levhaların çekme mukavemeti üzerindeki etkilerini araştırmaktadır. EN 1766 standartlarına göre üretilen beton plakalar, Duratek AV21 epoksi reçine kullanılarak Bazalt BFRP, Cam GFRP ve Karbon Fiber Takviyeli Polimer CFRP levhalarla güçlendirilmiştir. Numuneler, suya daldırma ve donma-çözülme döngüsü testlerine tabi tutulmadan önce kontrollü bir laboratuvar ortamında 232C, 505 RH 24 saat süreyle şartlandırılmıştır. EN 1542ye göre gerçekleştirilen çekme testleri, beton alt katmandaki yapışma hasarlarını ortaya çıkarmıştır. Kontrol numunelerinin ortalama çekme mukavemeti beton için 3,26 Nmm² ve epoksi reçine için 3,97 Nmm² olarak ölçülmüştür. Suya daldırma sonuçları, CFRP ve GFRP için çekme mukavemetinde sırasıyla 9 ve 2 oranında hafif bir düşüş gösterirken, BFRP 14lük bir artış sergilemiştir. Donma-çözülme döngüsü, tüm FRP türlerinde çekme mukavemetinin artmasına yol açmıştır: GFRP için 7, BFRP için 7,3 ve CFRP için 3,75. Bulgular, suya daldırma ve donma-çözülme koşullarının, FRP takviyeli betonun çekme mukavemeti üzerinde marjinal bir etkiye sahip olduğunu göstermektedir. Çevresel maruziyete rağmen tüm test sonuçları, FRP-beton bağının sağlamlığını ortaya koyan 2,5 MPalık gerekli çekme dayanımının üzerinde kalmıştır. Çalışma, zorlu ortamlarda yapısal güçlendirme için FRP kompozitlerin kullanımını desteklemekte ve olumsuz koşullar altında dayanıklılıklarını vurgulamaktadır. FRP ile güçlendirilmiş sistemlerin kapsamlı dayanıklılık değerlendirmelerini sağlamak amacıyla uzun vadeli performansı ve ek çevresel faktörleri araştırmak için daha fazla araştırma yapılması önerilmektedir.

Makale detayları

Effect of Water Immersion and Freeze-Thaw Cycles on Pull-off Strength of FRP Epoxy Bonded on Concrete: An experimental study

Yazarlar:

Metehan Çalış

Yayıncı:

Osmaniye Korkut Ata Üniversitesi

Ana Başlıklar:

Yapı Malzemeleri

Dergi:

Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi Vol.8 Issue 1, pp.82-99

Belge Tipi:

Makale

Yayın Tarihi:

1/2025

Belge Dili:

İngilizce

Document ID (Org No.):

2001330037

pISSN:

2687-3729

FRP

Freeze&Thaw

Water Immersion

Pull-off

Structural Strengthening

Construction MaterialsFiber Takviyeli Polimer

Donma&Çözülme

Suya Daldırma

Pull-off

Yapısal Güçlendirme

Yapı Malzemeleri

Sayı

Makale detayları

Yazarlar: Metehan Çalış

Yayıncı: Osmaniye Korkut Ata Üniversitesi

Ana Başlıklar: Yapı Malzemeleri

Dergi: Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi Vol.8 Issue 1, pp.82-99

Belge Tipi: Makale

Yayın Tarihi: 1/2025

Belge Dili: İngilizce

Document ID (Org No.): 2001330037

pISSN: 2687-3729

Sayı

Yazarlar:

Metehan Çalış

Yayıncı:

Osmaniye Korkut Ata Üniversitesi

Ana Başlıklar:

Yapı Malzemeleri

Dergi:

Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi Vol.8 Issue 1, pp.82-99

Belge Tipi:

Makale

Yayın Tarihi:

1/2025

Belge Dili:

İngilizce

Document ID (Org No.):

2001330037

pISSN:

2687-3729