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All Journal REKA RACANA Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Jurnal Jalan Jembatan
Gandhi Widiarnoko
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Engineering Transportation

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EVALUASI EFEKTIVITAS BAKTERI BACILLUS MEGATERIUM SEBAGAI MATERIAL INJEKSI SELFHEALING UNTUK PERBAIKAN RETAK BETON Alimin, Baso Muhammad Ilham; Muhammad Mauludin, Luthfi; Gandhi Widiarnoko
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol. 30 No. 1 (2025): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v30i1.6327

Abstract

Concrete deterioration is a significant problem in the construction industry, which can reduce the service life and structural performance of buildings. Conventional repair methods, such as the use of epoxy and other bonding materials, are commonly used to improve the durability of concrete, but often rely on synthetic materials that are not environmentally friendly. This study focuses on the use of Bacillus megaterium bacteria combined with epoxy as a self-healing injection material, offering an environmentally friendly and sustainable solution to overcome concrete cracking. This study explores the potential of Bacillus megaterium to biologically repair concrete structures by adding the bacteria to epoxy at concentrations of 5%, 10%, 15%, 20%, and 25%. Concrete blocks measuring 100 mm x 100 mm x 500 mm were tested using flexural strength, ultrasonic wave velocity (UPV), and scanning electron microscopy (SEM) tests to assess the effectiveness of the repair. The results showed that at a concentration of 15%, Bacillus megaterium increased the flexural strength by 12.19% of the initial strength and the UPV velocity reached 3.19 km/s, which was almost equivalent to normal concrete. SEM analysis showed the formation of calcium carbonate deposits on the cracks, indicating the success of the self-healing process. This study shows that the application of Bacillus megaterium in epoxy provides an environmentally friendly alternative to conventional concrete repair methods, reduces dependence on synthetic chemicals, and extends the service life of concrete infrastructure. This innovation contributes to the development of more sustainable and efficient construction practices in civil engineering.
Pengaruh Bakteri Bacillus megaterium sebagai Self-Healing Agent terhadap Kuat Lentur dan Kuat Tarik Tidak Langsung Beton Geopolimer Stella Nathania; Luthfi M. Mauludin; Gandhi Widiarnoko; Muhammad Azhar A. D.
RekaRacana: Jurnal Teknik Sipil Vol 12, No 1: Maret 2026
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaracana.v12i1.11

Abstract

ABSTRAKBeton geopolimer disusun dari material daur ulang yang ramah lingkungan, yaitu fly ash, recycled concrete aggregate, serta limbah serbuk cangkang telur dan kerang, sebagai upaya pengurangan penggunaan semen portland. Metode penelitian dilakukan melalui pengembangbiakan bakteri, pengolahan agregat limbah, pengujian sifat fisis material, serta pembuatan benda uji silinder dan balok. Hasil pengujian menunjukkan beton normal memiliki kuat tarik tidak langsung dan kuat lentur lebih tinggi dibandingkan dengan beton geopolimer. Penambahan bakteri mampu meningkatkan kekuatan beton geopolimer secara signifikan. Nilai kuat lentur beton geopolimer berbasis self-healing meningkat sekitar 29% dibandingkan dengan geopolimer biasa dan mendekati performa beton normal. Namun, beton geopolimer tidak mengalami self-healing disebabkan oleh larutan aktivator alkali 10 M dengan pH > 14. Meskipun kekuatan tekan mungkin melebihi beton geopolimer biasa, lingkungan alkali yang kuat bukanlah pH yang sesuai untuk bakteri Bacillus megaterium.Kata kunci: Bacillus megaterium, beton geopolimer, kuat lentur, kuat tarik tidak langsung, self-healing  ABSTRACKGeopolymer concrete is composed of environmentally friendly recycled materials, namely fly ash, recycled concrete aggregate, as well as waste powder from eggshells and seashells, as an effort to reduce the use of Portland cement. The research method was carried out through bacterial cultivation, waste aggregate processing, testing of the physical properties of materials, and the fabrication of cylindrical and beam specimens. The test results showed that normal concrete had higher splitting tensile strength and flexural strength compared to geopolymer concrete. The addition of bacteria was able to significantly improve the strength of geopolymer concrete. The flexural strength of self-healing-based geopolymer concrete increased by about 29% compared to ordinary geopolymer and approached the performance of normal concrete. However, geopolymer concrete did not undergo self-healing due to the use of a 10M alkaline activator solution with a pH > 14. Although the compressive strength may exceed that of ordinary geopolymer concrete, the strong alkaline environment is not a suitable pH for Bacillus Megaterium bacteriaKeywords: Bacillus megaterium, geopolymer concrete, flexural strength, indirect tensile strength, self-healing 
KINERJA BETON SELF-HEALING BERBASIS ENKAPSULASI UNTUK APLIKASI STRUKTUR JEMBATAN BETON rechita aprinnisa; Luthfi Muhammad Mauludin; Gandhi Widiarnoko
Jurnal Jalan Jembatan Vol 43 No 1 (2026): Jurnal Jalan Jembatan
Publisher : Direktorat Bina Teknik Jalan dan Jembatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58499/jatan.v43i1.1441

Abstract

This study investigates the performance of self-healing concrete incorporating Bacillus megaterium encapsulated in Polyvinyl Alcohol (PVA) microcapsules for potential applications in road and bridge structures. The study evaluates the effect of 2% PVA microcapsules on compressive strength and self-healing capability of concrete. Cylindrical specimens (150 × 300 mm) were tested at curing ages of 7 and 28 days in accordance with ASTM C39. The results showed that self-healing concrete exhibited higher compressive strength than normal concrete, reaching 25.46 MPa at 7 days and 32.13 MPa at 28 days, compared to 23.97 MPa and 28.48 MPa, respectively. After 28 days, damaged specimens were immersed in water to provide moisture conditions that support bacterial activation and biomineralisation during the self-healing process. The post-healing compressive strength reached 16.88 MPa, corresponding to approximately 53% recovery of the initial strength. The strength recovery is attributed to Microbially Induced Calcite Precipitation (MICP), in which bacterial activity promotes calcium carbonate (CaCO₃) precipitation that fills microcracks and pores within the concrete matrix. SEM and EDS analyses confirmed matrix densification and the presence of CaCO₃ deposits associated with bacterial biomineralization. The findings indicate that PVA-encapsulated Bacillus megaterium has a significant potential to improve the durability, crack-healing capability, and service life of concrete structures for road and bridge infrastructure applications   Kata Kunci: Bacillus megaterium, beton self-healing, polyvinyl alcohol (PVA), kuat tekan, kalsium karbonat. Keywords: Bacillus megaterium, self-healing concrete, polyvinyl alcohol (PVA), compressive strength, calcium carbonate.
Co-Authors Alimin, Baso Muhammad Ilham Luthfi M. Mauludin Luthfi Muhammad Mauludin Muhammad Azhar A. D. Muhammad Luthfi rechita aprinnisa Stella Nathania