Yulianto, Bagus (2025) Analisis Pengaruh Penambahan Bakteri Bacillus Cereus Terhadap Kuat Tarik Beton Self Healing. Other thesis, Universitas Islam Riau.

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Abstract

Concrete is a widely used construction material due to its favorable mechanical properties and high cost efficiency. However, microcracks in concrete remain a significant issue, as they can reduce structural durability and accelerate reinforcement corrosion. This study aims to evaluate the effectiveness of incorporating Bacillus cereus into self-healing concrete in enhancing splitting tensile strength. The bacterial concentrations tested were 1%, 2.5%, and 5%, with evaluations conducted at curing ages of 7 and 28 days. The results of this research are expected to broaden the understanding of biologically-based concrete characteristics and support the development of self-healing concrete technology to extend the service life of structures. This chapter presents the literature review, covering material composition, mechanical characteristics, and concrete testing methods, including splitting tensile strength and slump tests. The primary focus is on the use of Bacillus cereus as a self-healing agent in concrete, which facilitates the formation of calcium carbonate (CaCO₃) deposits to seal microcracks. In addition, conventional bacterial isolation methods and the properties of concrete constituent materials are also discussed. The review includes a summary of previous studies supporting the effectiveness of self-healing concrete in enhancing structural strength and crack resistance. Overall, this chapter serves as the conceptual foundation for the analysis in the subsequent experimental research phase. This chapter presents the results of testing the physical properties of aggregates, including gradation, specific gravity, moisture content, silt content, and bulk density. All parameters indicate that the aggregates used meet the specification requirements according to ASTM C33 and SNI standards. The concrete mix was designed with variations of Bacillus cereus addition at 1%, 2.5%, and 5% of the total cement weight. Slump test results showed a value of 600 mm for all variations, indicating an excellent level of workability. Furthermore, the splitting tensile strength test at 7 days demonstrated an improvement in the mechanical properties of concrete, with a maximum value of 12.305 MPa achieved in the mix with 5% bacterial addition. These findings confirm the effectiveness of incorporating Bacillus cereus in enhancing the early strength of concrete and support its application as self-healing concrete.

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