Pengaruh Variasi Konsentrasi Bakteri Bacillus Cereus terhadap Kuat Lentur Beton pada Self Healing Concrete (SHC)

Abstract

Construction in Indonesia, However, due to several factors such as overloading and shrinkage, it can cause cracks on the concrete surface, which can damage the structure and shorten the service life of the concrete. For this reason, self-healing concrete innovation is needed using Bacillus Cereus bacteria as a substitute for air which aims to heal micro cracks on the concrete surface. The research method is experimental, carried out in the laboratory with variations in the addition of Bacillus Cereus bacteria in concentrations of 10², 10⁵, 10⁸ cfu/ml. This variation will determine the most optimal concentration of adding B.cereus to self-healing concrete. Based on analysis of the results of the flexural strength test, it shows that concrete with the addition of B. cereus has a concentration of 10², 10⁵, 10⁸ cfu/ml, and normal concrete has flexural strength values of 0.73 MPa, 0.91 MPa, 1.94 MPa, and 2.71 MPa. From the SEM and UPV test results, it was concluded that during the 56 days of observing the bacteria healing cracks, the bacteria closed the cracks quite significantly, but only in a few segments with a crack width of no more than 0.3 mm.