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All Journal International Journal of Applied Technology Research Jurnal Konstruksi dan Infrastruktur : Teknik Sipil dan Perencanaan
Luthfi Muhammad Mauludin
Politeknik Negeri Bandung
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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The Effect of Inclusion on Crack Propagation Using Extended Finite Element Method Aji Pratama Rendragraha; Luthfi Muhammad Mauludin
Jurnal Internasional Penelitian Teknologi Terapan Vol 3 No 1 (2022): April 2022
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v3i1.78

Abstract

Numerical simulation is developed to investigate the effect of inclusion on crack propagation. In this study, the crack growth is modeled using extended finite element method (XFEM). Two-dimensional rectangular plate with single inclusion embedded off-centered is modeled. The specimen is subjected to uniaxial tension. The dimensions of the specimen are 40 mm x 80 mm and the radius of the inclusion is 10 mm. The specimen is pre-cracked with the length of an edge crack is 5 mm. The motion of the crack is modeled by XFEM based on traction-separation cohesive behavior for 2D mixed mode problem. In addition, enrichment procedure is used to implicitly determine predefined crack in XFEM framework. Two different inclusions, which are soft and hard inclusions, are considered on crack propagation scheme. The effects of soft and hard inclusions on crack propagation are studied and observed. The results showed that the trajectory of crack highly depends on inclusion inside the material. In the case of soft inclusion, propagation of the crack tended to approach the inclusion. Whereas in the case of hard inclusion, crack trajectory tended to move away from the inclusion. The mismatch of elastic modulus between inclusion and surrounded materials has significant effect on propagation of crack.
Pengaruh Bakteri Bacillus Megaterium Sebagai Self-Healing Agent Pada Kuat Tekan Beton Dengan Agregat Buatan Berbasis Limbah Fly Ash Fikkry Agustiansyah; Raya Syah Adzani; Luthfi Muhammad Mauludin; Linda Aisyah
Jurnal Konstruksi dan Infrastruktur : Teknik Sipil dan Perencanaan Vol 13 No 3 (2025): Jurnal Konstruksi dan Infrastruktur Vol 13 No.3 Desember 2025 Special Edition: E
Publisher : Civil Engineering Department, Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jki.v13i3.10608

Abstract

In the construction world, there exist an innovation to make use of artifical aggregates to reduce using natural aggregates that are limited in nature, but their usage usually lowers the concrete’s compression strength. That is why the innovation of utilizing bacteria as a healing agent can be used for its self-healing property to fix cracks formed on the concrete. In this study, the bacteria bacillus megaterium were used as a healing agent with a percentage of 2% of the composition of the water used and artifical aggregate with the optimal composition of 60% type F fly ash : 40% of the inorganic compound calcium hydroxide with a water content of 37,7% of the weight of fly ash used. The artifical aggregate is made using the pan granulator method and water is sprayed evenly during its production. The compression test of the concrete is done with samples at the size of 100 x 200 mm and 150 x 300 mm on 28 days of age. In this study, 4 variables of fly ash are compared which are 100%, 100% with 2% bacteria, 50% with 2% bacteria, and normal concrete. The compression strength results at 28 days of age in order are 15,27 MPa, 22,16 MPa, 21,57 MPa, and 22,61 MPa. After 30 days of healing, the average compressive strengths of the specimens were 11,8 MPa, 14,45 MPa, 27,33 MPa, and 12,6 MPa, with healing efficiencies of 58,58%, 67,72%, 123,33%, and 48,08%, respectively.
Co-Authors Aji Pratama Rendragraha Fikkry Agustiansyah Linda Aisyah Raya Syah Adzani