To promote diatom-based biofuel productions in clean energy, this paper explores the potential of using biosilica as a renewable and regenerative byproduct from diatom-based biofuel production in cementitious materials. High-purity diatomite (DE), a biosilica model compound, is selected to investigate the microstructure and durability performance of diatom-based cementitious composites. The replacement of portland cement with 30 wt.% DE significantly enhances the resistance to leaching, reduces the rapid chloride permeability, but increases the drying shrinkage at early ages. The microstructure of DE-containing matrix is refined due to the lime-silica reaction, and the interfacial transition zone of DE-containing concrete is densified. Overall, the DE-induced microstructural changes enhance the durability performance of DE-containing cementitious composites, which in turn demonstrates the feasibility of using biosilica as a sustainable cement substitute. The use of biosilica from diatom-based biofuel production can potentially reduce the CO₂ emissions of carbon-intensive concrete production and promote the development of clean energy.

为了促进清洁能源中硅藻基生物燃料的生产，本文探讨了使用生物二氧化硅作为胶凝材料中硅藻基生物燃料生产的可再生和再生副产品的潜力。选择高纯度硅藻土 (DE) 是一种生物二氧化硅模型化合物，用于研究硅藻基水泥基复合材料的微观结构和耐久性性能。用 30 wt.% DE 替代硅酸盐水泥显着增强了抗浸出性，降低了氯离子的快速渗透，但增加了早期的干燥收缩。由于石灰-二氧化硅反应，含DE基体的微观结构被细化，含DE混凝土的界面过渡区被致密化。总体，DE 引起的微观结构变化增强了含 DE 水泥基复合材料的耐久性，这反过来证明了使用生物二氧化硅作为可持续水泥替代品的可行性。使用基于硅藻的生物燃料生产中的生物二氧化硅可以潜在地减少二氧化碳₂碳排放量高​​的混凝土生产促进清洁能源的发展。