An Analysis on the Interaction of Material Characteristics of Textile Type Glass Fibers with the Effect of Temperature Change in Alkaline Hydrolysis Environment

Year 2025, Volume: 15 Issue: 1, 21 - 34, 22.04.2025

Lütfullah Gündüz , Şevket Onur Kalkan

Abstract

The main concern about glass fiber reinforcement in cement-based products is that glass fibers are not durable in alkaline environments. Studies have shown that glass fibers can be damaged by the alkaline environment of cement. In addition, the temperature of the alkaline environment can also change the effect on glass fibers. In this study, 2 different textile types of glass fibers were exposed to alkaline environment conditions. The glass fibers used were collected as waste/residual material and obtained through physical recycling, with dimensions of 6 mm length, average diameter of 15 µm (GFa) and 12 mm length, average diameter of 17 µm (GFb). Within the scope of the study, NaOH solutions were prepared at 3 different concentrations. These concentrations are by weight of 0.5%, 1.5% and 3% NaOH/water solutions. In this study, 12 different temperature values were applied and they are 20°C, 24°C, 30°C, 35°C, 40°C, 45°C, 70°C, 75°C, 80°C, 85°C, 90°C and 95°C, respectively. Glass fibers were exposed to interaction in NaOH solution at different temperatures and concentrations for 4 hours. The mass loss of the fibers and the change in fiber diameters after alkali interaction were investigated. According to the study results, the mass loss values of GFa fiber in 0.5%, 1.5% and 3% NaOH hydrolysis at 20°C normal room temperature were 0.444%, 0.682% and 0.913%, respectively. The mass loss of GFb fiber sample under 20°C temperature effect was 0.524%, 0.712% and 0.994% on average, respectively. The changes in fiber diameters as a result of 3 different 0.5%, 1.5% and 3% NaOH hydrolysis for 4 hours at 20°C normal room temperature conditions were determined as 14.960, 14.949 and 14.931 µm for GFa and 16.955, 16.939 and 16.915 µm for GFb, respectively. It was noted that both mass and fiber diameter decreased as the temperature increased for both fiber types.

Keywords

Alkali environment resistance , glass fiber , NaOH solution , temperature and time

Alkali Hidroliz Ortamda Sıcaklık Değişimi Etkisiyle Tekstil Tipi Cam Elyafların Malzeme Karakteristiğinin Etkileşimi Üzerine Bir Analiz

Abstract

Çimento bağlayıcılı ürünlerde cam elyaf takviyesi ile ilgili en temel kaygı, cam elyafların alkali ortamda dayanıksız olmasıdır. Yapılan çalışmalarda cam elyafların çimentonun alkali ortamından zarar görebileceği belirtilmektedir. Ayrıca, alkali ortamın sıcaklık derecesi de cam elyaf üzerindeki etkiyi değiştirebilmektedir. Bu çalışmada, 2 farklı tekstil tipi cam elyaf, alkali ortam koşullarına maruz bırakılmıştır. Kullanılan cam elyaflar atık/artık malzeme olarak toplanmış fiziksel geri dönüşümle elde edilmiş 6 mm boy, ortalama 15 µm çap (GFa) ve 12 mm boy, ortalama 17 µm çap (GFb) boyutlarındadır. Çalışma kapsamında 3 farklı derişimde NaOH çözeltileri hazırlanmıştır. Bu derişimler %0.5, %1.5 ve %3’lük ağırlıkça NaOH/Su çözeltileridir. Çalışma kapsamında 12 farklı sıcaklık değerleri uygulanmış olup sırasıyla 20°C, 24°C, 30°C, 35°C, 40°C, 45°C, 70°C, 75°C, 80°C, 85°C, 90°C ve 95°C’dir. Cam elyafları farklı sıcaklık ve derişimde NaOH çözeltisinde 4 saat süre boyunca etkileşime maruz bırakılmıştır. Alkali etkileşimi sonrası elyafların kütle kaybı ve elyaf çaplarının değişimi incelenmiştir. Çalışma sonuçlarına göre, GFa elyafının %0.5, %1.5 ve %3 NaOH hidrolizinde 20oC normal oda sıcaklığında kütle kaybı değerleri sırasıyla %0.444, %0.682 ve %0.913’tür. GFb elyaf örneğinin 20oC sıcaklık etkisinde kütle kaybı ise sırasıyla ortalama %0.524, %0.712 ve %0.994’tür. 20oC normal oda sıcaklığı koşullarında 4 saat süreyle 3 farklı %0.5, %1.5 ve %3’lük NaOH hidrolizi sonucu elyaf çaplarındaki değişim sırasıyla, GFa için 14.960, 14.949 ve 14.931 µm ve GFb için 16.955, 16.939 ve 16.915 µm olarak belirlenmiştir. Sıcaklık arttıkça her iki elyaf türü için de hem kütle hem de elyaf çapının azaldığı kaydedilmiştir.

Keywords

Alkali ortam dayanıklılığı , cam elyaf , NaOH çözeltisi , sıcaklık ve süre.

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