| dc.description.abstract | As the high-performance material, engineered cementitious composite (ECC) has developed with many methods to improve the properties, such as changing the fly ash content, adding new type of fiber, adding strong additive compound, and incorporating with bacteria agent. The objective of developing ECC technology was not just about improving mechanical qualities, but also about ensuring the durability performances. One of the characteristics used to assess durability performance is service life ability. To extend the service life of ECC, some properties have to be improved, such as chloride ingress and corrosion resistance. In order to achieve high durability performance, the incorporation of bacillus subtilis into the ECC is being examined in this study. To keep bacteria alive in the harsh environment of the ECC mixture, silica gel is employed in the immobilization procedure. In this study, the content of bacteria immobilized silica gel varies from 5%, 10%, and 15%. The results reveal that utilizing bacillus subtilis immobilized in silica gel increases the durability performances, especially on drying shrinkage, chloride diffusivity, and corrosion resistance.
Furthermore, the service life of ECC can be estimated by using surface chloride concentration and apparent diffusion coefficient from this research. The time-dependant reduction coefficient, m, was determined using effective time methods. Since the reduction of calculated diffusion coefficient with time has great impact on service life prediction, it is imperative to also know how the diffusion and time-dependant reduction coefficient were obtained.
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