International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 09 | Sep 2025
p-ISSN: 2395-0072
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Investigation Of Self Healing Concrete To Fill The Cracks Developed In RC Beam With Methyl Methracrylate Rahul Gowda B Y1, Dr.S Kavitha2 1PG Student (MTech) in Structural Engineering, Dr Ambedkar Institute of Technology, Bangalore, Karnataka, India 2Professor, Department of Civil Engineering, Dr Ambedkar Institute of Technology, Bangalore, Karnataka, India ---------------------------------------------------------------------***--------------------------------------------------------------------between un-hydrated cement particles and the healing Abstract - Concrete, one of the most widely used
agents.
construction materials, is susceptible to cracking, which compromises its durability and load-bearing capacity. Selfhealing concrete provides a sustainable and cost-effective solution to mitigate crack propagation and restore structural integrity. This study investigates the potential of methyl methacrylate (MMA), combined with 15% Dr. Fixit Integral Bond (a waterproofing admixture), encapsulated within glass capsules and vascular tubes, to enhance healing performance in M30 grade concrete. The experimental program involved casting concrete cubes and beams embedded with MMA-filled capsules and vascular tubes. Healing performance was assessed by introducing cracks and monitoring recovery over a 9-hour period at 1-hour intervals, followed by compressive and flexural strength evaluations. The results highlight the efficiency of the system in sealing cracks, improving durability, and restoring strength, indicating its applicability for real-world infrastructure.
Qureshi et al. (2016) [2] This study focuses on using encapsulated expansive minerals (magnesium oxide, bentonite, and quicklime) for self-healing in cement-based mortars. Here they used concentric glass capsules to contain the minerals and water. It was found that samples put in water showed the highest healing efficiency, with approximately 95% crack sealing and 25% strength recovered in 28 days. The research also found that this system was able to effectively heal large cracks, up to 400 µm. The self-healing process involved the hydration of expansive minerals initially, followed by slow carbonation over time. Taheri and Clark (2021) [3] This article describes the preparation of PMMA nanocapsules for use as self-healing additives in concrete via a miniemulsion polymerization technique. The healing components (resin and hardener) were separately encapsulated in PMMA shells. The study found that these nanocapsules survived the mixing and hardening processes. When cracks occurred, the stress fields broke the brittle shells, releasing the healing agents to bridge early-stage fractures (<10 µm). Long-term healing was achieved through the formation of polymorph calcite crystals in the presence of moisture and carbon dioxide.
1.INTRODUCTION Concrete is an indispensable construction material due to its high compressive strength, durability, and costeffectiveness. However, its brittle nature makes it prone to cracking, which reduces service life and leads to costly repairs. Traditional repair methods are inefficient, particularly for inaccessible structures. Self-healing concrete, inspired by biological systems, offers an innovative solution by autonomously sealing cracks using encapsulated healing agents. Among these, methyl methacrylate (MMA) has demonstrated considerable promise due to its low viscosity, rapid polymerization, and strong bonding ability. This study integrates MMA with Dr. Fixit Integral Bond and evaluates its performance through encapsulation in capsules and vascular tubes within M30 concrete specimens.
Gilabert et al. (2017) [4] This paper investigates the strength and debonding energy of a glass-concrete interface, which is crucial for encapsulation-based selfhealing concrete. The study found that samples exhibited clean debonding between the glass and concrete. Khaliq and Ehsan (2016) [5] This article discusses crack healing using bio-influenced self-healing techniques. It explores different bacterial incorporation methods to achieve crack healing. The study found that graphite nanoplatelets were a good carrier compound for shortterm healing, while lightweight aggregates were effective for long-term healing. It also notes that incorporating lightweight aggregate improved the concrete's compressive strength
2.LITERATURE REVIEW Danish et al. (2020) [1] This paper provides a critical review of self-healing techniques, highlighting their applications and performance. It notes that the geometry and size of cracks are crucial in selecting a self-healing method. Encapsulation of chemical healing agents sought considered more effective due to enhanced reaction
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