کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6480463 1428759 2017 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Performance evaluation and microstructural characterization of GFRP bars in seawater-contaminated concrete
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
Performance evaluation and microstructural characterization of GFRP bars in seawater-contaminated concrete
چکیده انگلیسی


- Durability of GFRP bars in seawater-contaminated concrete was investigated.
- Strength retentions and changes in microstructural characteristics were recorded.
- Deterioration mechanisms of GFRP in seawater-contaminated concrete were reported.

This paper aims to investigate the durability performance and microstructure characteristics of two different types of commercially-produced glass fiber-reinforced polymer (GFRP) bars conditioned in moist seawater-contaminated concrete. GFRP bars encased in seawater-contaminated concrete were immersed in tap water for 5, 10, and 15 months at temperatures of 20, 40, and 60 °C. Following conditioning, the GFRP bars were retrieved then tested to failure under uniaxial tension. Microstructure analysis was performed by employing differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and matrix digestion using nitric acid. Type I GFRP bars, with the lower moisture uptake, exhibited insignificant strength reductions in the range of 2-15% whereas Type II, with the higher moisture uptake, exhibited substantial strength reductions in the range of 19-50%. Type II GFRP bars featured lower matrix retention and developed higher hydroxyl ions during conditioning than those of their Type I counterparts. The extent of degradation was more sensitive to the conditioning temperature rather than conditioning duration. A decrease in the glass transition temperature (Tg) of both types of GFRP bars was recorded, indicating matrix plasticization. Results of SEM highlighted matrix disintegration and fiber debonding after conditioning.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 147, 30 August 2017, Pages 66-78
نویسندگان
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