To address the challenges associated with ultra-high performance concrete (UHPC), such as its low water-to-cement ratio, high production costs, and substantial cement consumption, this study developed an eco-friendly and cost-effective UHPC variant. This was achieved by incorporating industrial solid wastes and natural pozzolanic materials, specifically limestone powder, slag, and pumice powder, as supplementary cementitious materials. UHPC performance test, BBD response surface test, PCAS porosity analysis system and SEM scanning electron microscopy were used to explore the effects of various admixtures on its basic physical properties and microstructure. The results show that substituting cement with limestone powder, slag, and pumice powder not only enhances the mechanical strength and durability of UHPC but also refines its microstructure. Moreover, this substitution strategy significantly reduces both the economic and environmental costs of UHPC production while maintaining its superior performance. The outcomes of this study offer valuable insights for the formulation of sustainable and economically viable UHPC, contributing to the advancement of green construction materials.
为评估UHPC的生态性,根据EN ISO 14040和EN ISO 14044标准,采用5个评价指标来评估UHPC的环境效益。基础材料的环境效益[18]见表9,对照组和试验组UHPC的环境效益对比见表10。其中,εCED为可再生能源消耗量;εCEN为不可再生能源消耗量;εGWP为CO2排放量;εAP为酸性物质排放量;εEP为磷化物排放量。
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