تحليل الانحدار الخطي لتأثير أبعاد الشقوق الخرسانية على استعادة مقاومة الشد والانحناء باستخدام مادة الإصلاح الإيبوكسية Sikadur-31 CF Slow

نوري محمد الباشا; بثينة  المجدوب

doi:10.66411/jer.v41i1.123

Authors

Nuri Muhammad El-Basha Department of Civil Engineering, Faculty of Engineering, Sabratha University, Libya Author
Buthaina Al-Majdoub Department of Civil Engineering, Faculty of Engineering, Sabratha University, Libya Author

DOI:

https://doi.org/10.66411/jer.v41i1.123

Keywords:

Concrete cracks, concrete repair, epoxy, Sikadur-31 CF Slow, Split Tensile Strength, flexural strength, modeling, regression analysis

Abstract

Concrete cracks are among the most significant factors affecting the durability and performance of concrete structures. They cause a decrease in load-bearing capacity and facilitate the penetration of harmful substances, leading to corrosion of reinforcing steel and deterioration of the structural framework. Epoxy injection is considered one of the most effective repair techniques for restoring the structural integrity of cracked elements. This study aims to evaluate the efficiency of the epoxy material Sikadur-31 CF Slow in restoring the mechanical properties of cracked concrete. Concrete samples containing artificial cracks with widths of 1, 3, and 5 mm and depths of 2, 5, and 7 cm were prepared. The results showed that the highest restoration efficiency in tensile strength was 104.37% at narrow cracks (1 mm and 2 cm), while it decreased to 35.67% at wider cracks (5 mm and 7 cm). The flexural strength restoration rates ranged between 95% and 82.57%, indicating relative stability compared to the tensile behavior. The prediction equations showed high agreement with experimental results, with an error rate of less than 0.61% in flexural strength, confirming their reliability. The results highlight that crack width is the most influential factor on repair efficiency compared to depth. This is attributed to the nature of Sikadur-31 CF Slow, a thixotropic epoxy grout designed for bonding and void filling, rather than a low-viscosity injection material. Despite its use as a practical alternative due to the limited availability of specialized injection materials in the Libyan market, it achieved a significant improvement in mechanical properties. The study concludes that early intervention to repair cracks ensures the highest strength recovery rates, and that prediction equations represent a practical tool for supporting maintenance decisions, enhancing the durability of concrete structures, and extending their service life.

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