Electronic Theses and Dissertation

Beton bertulang mutu tinggi memiliki kuat tekan tinggi, namun tetap rentan mengalami retak akibat beban impact yang dapat menurunkan kinerja struktur. penelitian ini bertujuan menganalisis perilaku pelat beton bertulang mutu tinggi setelah mengalami kerusakan akibat beban impact serta mengevaluasi efektivitas injeksi bakteri bacillus sp. sebagai self-healing agent. penelitian menggunakan pelat beton bertulang mutu 85 mpa dengan variasi dimensi 40×40×5 cm, 60×60×5 cm, dan 80×80×5 cm. injeksi dilakukan menggunakan larutan bakteri bacillus sp. berkonsentrasi 0,6%, kemudian dilakukan pengujian impact dengan parameter jumlah pukulan, energi serapan, regangan, dan pola retak. hasil penelitian menunjukkan bahwa injeksi bakteri mampu mempertahankan kapasitas benturan pelat beton hingga 70% setelah mengalami kerusakan. kapasitas impact pelat setelah injeksi meningkat dibandingkan pelat tanpa injeksi, sedangkan pelat dengan aspek rasio yang lebih kecil memiliki kemampuan menahan benturan lebih tinggi. aktivitas bakteri yang menghasilkan endapan kalsium karbonat (caco₃) membantu mengisi retakan sehingga memperlambat perkembangan retak dan meningkatkan ketahanan pelat beton terhadap beban impact.

High-strength reinforced concrete possesses high compressive strength and durability; however, it remains susceptible to cracking under impact loading, which can reduce its structural performance. This study aims to analyze the behavior of high-strength reinforced concrete slabs after impact-induced damage and to evaluate the effectiveness of Bacillus sp. injection as a self-healing agent. The study used 85 MPa reinforced concrete slabs with dimensions of 40 × 40 × 5 cm, 60 × 60 × 5 cm, and 80 × 80 × 5 cm. The cracks were repaired by injecting a 0.6% Bacillus sp. solution, followed by impact testing to evaluate the number of blows, absorbed energy, strain, and crack patterns. The results indicate that bacterial injection was able to maintain up to 70% of the impact resistance of the damaged concrete slabs. The impact capacity of the repaired slabs increased compared to unrepaired specimens, while slabs with lower aspect ratios exhibited greater impact resistance. The precipitation of calcium carbonate (CaCO₃) produced by the bacterial activity effectively filled the cracks, slowed crack propagation, and improved the slabs' resistance to impact loading.