Studi Analisis Kemampuan Self Healing Concrete Dengan Menggunakan Media Bakteri Bacillus Sp

Syahputra, Aidil (2023) Studi Analisis Kemampuan Self Healing Concrete Dengan Menggunakan Media Bakteri Bacillus Sp. Other thesis, Universitas Islam Riau.

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Abstract

Concrete is a major building material that is often used in the construction of buildings such as factories, long-term storage facilities, bridges, and other similar structures. In addition to concrete quality issues, there are several other factors that can arise during the concrete manufacturing process, such as possible cracking that occurs after the concrete has hardened. Concrete cracks are very difficult to eliminate as they can negatively impact the porosity and permeability of the material. Self healing concrete was developed as an innovative method to treat crack damage independently. One of the bacterial media in the self-healing concrete method is Bacillus Sp. Bacillus SP bacteria will be reacted with urea and CaCl2 which will produce CaCl3 which will close the cracks in the concrete. The purpose of this study was to determine the effect of using Bacillus SP bacteria on compressive strength and split tensile strength, to determine the effect of Bacillus SP bacteria on the compressive strength of concrete after cracking, to determine the physical form of concrete using Bacillus SP bacteria as seen from the results of SEM (Scanning Electronic Microscope) testing. This research uses the method of calculating concrete mix (mix design) based on SNI 7656: 2012. The study used 15 cylinder samples. This method is done by adding Bacillus SP bacteria. The percentage of bacteria is 10% of the weight of cement. Based on the research, the compressive strength value with a mixture of bacillus sp bacteria 10% of the weight of cement decreased from normal concrete. The compressive strength value of normal concrete is 18.78 Mpa to 12.55 Mpa after adding bacillus sp bacteria with a percentage decrease from normal concrete of -33.17%. The split tensile strength value of concrete with the addition of bacillus sp bacteria increased from the normal concrete split tensile strength of 0.22 Kg/cm² to 0.26 Kg/cm² after the addition of bacillus sp bacteria with a percentage increase of 18.18%. The results of the compressive strength value of concrete with a mixture of bacillus sp bacteria with a percentage of 10% of the weight of cement after cracking increased the compressive strength value of normal concrete, namely for normal concrete of 18.78 Mpa while for concrete with a mixture of bacillus sp bacteria of 12.55 Mpa with a percentage decrease of 33.17% from normal concrete. The compressive strength value of concrete with a mixture of bacillus sp bacteria after cracking is obtained a higher value than un-cracked concrete, which is 24.35 Mpa for concrete that has been cracked. The un-cracked concrete is 29.66% lower than the normal concrete. Scanning Electronic Microscope (SEM) test results of concrete added with Bacillus sp bacteria showed needle-shaped bacterial cells. Bacillus sp bacteria can live and multiply in concrete to form a pile of lime substance that adheres to concrete. Whereas in normal concrete there are no visible bacterial cells or piles of lime.

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