Study on Compressive Strength, Flexural Behavior, and Chloride Penetration of Steel Fiber Reinforced Concrete (SFRC) under Chloride Environment
Abstract
งานวิจัยนี้มีวัตถุประสงค์เพื่อศึกษาผลของปริมาณเส้นใยเหล็กและระยะเวลาแช่ในสภาวะที่มีคลอไรด์สูงต่อกำลังรับแรงอัด กำลังรับแรงดัด และการซึมผ่านคลอไรด์ในคอนกรีตเสริมเส้นใยเหล็ก (Steel Fiber Reinforced Concrete; SFRC) โดยพิจารณาปริมาณเส้นใย 30 60 และ 90 กิโลกรัมต่อลูกบาศก์เมตร และระยะเวลาแช่ในสารละลาย NaCl ความเข้มข้น 10 wt% เป็นเวลา 100 และ 200 วัน ผลการทดลองพบว่าการเพิ่มปริมาณเส้นใยเหล็กช่วยเพิ่มกำลังรับแรงอัดและกำลังรับแรงดัดอย่างมีนัยสำคัญ โดยกำลังอัดเพิ่มขึ้นประมาณ 15–20% และค่ากำลังรับแรงดัดคงค้างรวมถึงค่าการดูดซับพลังงานเพิ่มขึ้นสะท้อนถึงพฤติกรรมหลังการแตกร้าวที่ดีขึ้น อย่างไรก็ตามหลังการแช่ในสารละลายคลอไรด์เป็นระยะเวลานานกำลังรับแรงอัดมีแนวโน้มเพิ่มขึ้นเล็กน้อยในทุกกลุ่ม ซึ่งอาจเกี่ยวข้องกับการพัฒนากำลังของคอนกรีตในระยะยาวและการบ่มต่อเนื่องมากกว่าผลของคลอไรด์โดยตรง ในขณะที่สมรรถนะด้านการดัด โดยเฉพาะกำลังรับแรงดัดคงค้างมีแนวโน้มลดลงในตัวอย่างที่มีเส้นใยระดับปานกลางถึงสูง ซึ่งสัมพันธ์กับการกัดกร่อนของเส้นใยบริเวณผิวคอนกรีต ทั้งนี้ การทดสอบการซึมผ่านคลอไรด์พบว่าคลอไรด์แทรกซึมในระดับความลึกประมาณ 3–6 มิลลิเมตร เท่านั้น ผลการศึกษาชี้ให้เห็นว่าปริมาณเส้นใยเหล็กที่เหมาะสมสามารถเพิ่มสมรรถนะเชิงกลและความทนทานของคอนกรีตได้ อย่างไรก็ตามในสภาวะที่มีคลอไรด์สูงการใช้เส้นใยในปริมาณมากอาจส่งผลกระทบต่อสมรรถนะด้านการดัดในระยะยาว ดังนั้นการออกแบบคอนกรีตเสริมเส้นใยเหล็กควรพิจารณาทั้งปริมาณเส้นใยและมาตรการป้องกันการกัดกร่อนร่วมกัน
This study aimed to investigate the effects of steel fiber content and exposure duration under high chloride conditions on the compressive strength, flexural performance, and chloride penetration of Steel Fiber Reinforced Concrete (SFRC). Steel fiber contents of 30, 60 and 90 kg/m³ were investigated, and the specimens were immersed in a 10 wt% NaCl solution for 100 and 200 days. The experimental results showed that increasing the steel fiber content significantly improved both compressive strength and flexural performance. The compressive strength increased by approximately 15–20%, while the residual flexural strength and energy absorption capacity also increased, indicating improved post-cracking behavior. After prolonged exposure to the chloride solution, a slight increase in compressive strength was observed in all groups, which may be attributed to continued hydration and long-term curing effects rather than the direct influence of chloride. In contrast, flexural performance, particularly residual flexural strength, tended to decrease in specimens with medium to high fiber contents after exposure, which was associated with corrosion of steel fibers near the concrete surface. Chloride penetration testing revealed that chloride ions penetrated only to a shallow depth of approximately 3–6 mm. The findings suggest that an appropriate steel fiber dosage can enhance both the mechanical performance and durability of concrete. However, under high chloride conditions, excessive fiber content may adversely affect long-term flexural performance. Therefore, the design of SFRC should consider both steel fiber dosage and corrosion protection measures.
Keywords
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DOI: 10.14416/j.kmutnb.2026.10.001
ISSN: 2985-2145
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