| 摘要: | 工程水泥基複合材料（ECC）作為高性能材料，通過改變粉煤灰含量、添加新型纖維、添加強添加劑化合物、摻入殺菌劑等多種方法來提高性能。 開發ECC技術的目的不僅僅是提高機械性能，還包括確保耐久性能。 用於評估耐久性能的特徵之一是使用壽命能力。 為了延長ECC的使用壽命，必須提高一些性能，例如氯化物侵入和耐腐蝕性。 為了實現高耐久性能，本研究正在研究將枯草芽孢桿菌摻入 ECC 中。 為了使細菌在 ECC 混合物的惡劣環境中存活，在固定過程中使用了矽膠。 在本研究中，細菌固定化矽膠的含量從 5%、10% 和 15% 不等。 結果表明，利用固定在矽膠中的枯草芽孢桿菌提高了耐久性能，尤其是在乾燥收縮、氯化物擴散性和耐腐蝕性方面。
此外，ECC 的使用壽命可以通過使用本研究的表面氯化物濃度和表觀擴散係數來估算。 使用有效時間方法確定時間相關的減少係數 m。 由於計算的擴散係數隨時間的減少對使用壽命預測有很大影響，因此還必須知道擴散和時間相關的減少係數是如何獲得的。
;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. |
