Studi Experimental Penggunaan Bakteri Bacillus Sp Terhadap Kemampuan Self Healing Concreate (SHC)

Ridwansyah, Ridwansyah (2023) Studi Experimental Penggunaan Bakteri Bacillus Sp Terhadap Kemampuan Self Healing Concreate (SHC). Other thesis, Universitas Islam Riau.

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Abstract

Concrete is one of the materials used for construction. However, there are still some problems that occur, one of which is that there are cracks in it. Cracks that often occur in concrete due to the low tensile strength of the material. This crack will affect the strength and durability of the concrete. Crack repair in concrete occurs due to the precipitation of calcium carbonate by bacteria. The purpose of this research is 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 method uses microbiologically induced calcite or calcium carbonate (CaCO ) precipitation (MICCP) based on the concept of bio mineralisation, by adding bacteria to concrete, producing calcium carbonate that blocks cracks and micro concrete. 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. 3 Based on the research, the compressive strength value with a mixture of bacillus sp bacteria 10% of the water volume decreased from normal concrete, the compressive strength value of normal concrete was 21.23 Mpa, while the compressive strength value of concrete with added bacillus sp bacteria was 18.68 Mpa with a percentage decrease from normal concrete by 12.01%. The split tensile strength value of concrete with added bacillus sp bacteria increased from the normal concrete split tensile strength where the normal concrete split tensile strength value was 0.24 Kg/cm², while the concrete split tensile strength value with added bacillus sp bacteria was 0.28 Kg/cm² with a percentage increase of 16.66%. The compressive strength value of concrete with a mixture of bacillus sp bacteria with a percentage of 10% of the volume of water after cracking decreased the compressive strength value of normal concrete. Normal concrete is 21.23 Mpa while for concrete with a mixture of bacillus sp bacteria it is 18.68 with a percentage decrease of -9.33% 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 22.65 Mpa for concrete that has been cracked, un-cracked concrete is 18.68. From the results of Scanning Electronic Microscope (SEM) testing of concrete added with Bacillus sp bacteria, it can be seen that the bacterial cells are needle-shaped. 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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