Smart & Sustainable Infrastructure: Building a Greener Tomorrow - Proceedings of the 1st Interdisciplinary Symposium on Smart & Sustainable Infrastructure (ISSSI 2023)
Smart & Sustainable Infrastructure: Building a Greener Tomorrow - Proceedings of the 1st Interdisciplinary Symposium on Smart & Sustainable Infrastructure (ISSSI 2023)
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聪明的
DOI：
10.1007/978-3-031-53389-1_28
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发表时间：
2024
期刊：
影响因子：
--
通讯作者：
Basavaraj A
中科院分区：
文献类型：
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作者：
Basavaraj A
混凝土行业向低碳道路的过渡不仅需要优化配料设计，降低熟料/水泥含量，还需要采取其他干预措施，减少混凝土在其价值链中的碳足迹。现行规范规定了混凝土混合料的最低水泥含量，以在各种暴露等级下保持耐久性，但通常没有规定水泥类型。规范还规定了基体强度高于50 MPa的钢筋混凝土构件所需钢筋量的增加，部分抵消了减少采用高强度混凝土的给定构件所用混凝土量的潜在碳效益。这对钢筋混凝土设计提出了两个“硬”约束，即每单位结构性能的最低碳。有了这两个实际的限制，在本文中，几种材料和设计参数的影响进行了讨论和评估的碳减排潜力的混凝土系统。所考虑的参数是：i）降低混凝土混合物中的熟料含量，同时符合规范规定的最低水泥含量，以满足所需的耐久性; ii）生产质量更好的混凝土，例如，通过最小化目标平均强度和所需特征抗压强度之间的裕度，以及iii）在设计阶段减小混凝土的部分安全系数，同时假设最小载荷要求。当这些参数与规范中规定的参数不同时，可以量化混凝土和钢筋混凝土元件的碳足迹有显著的潜在减少。
The transition of the concrete industry towards a low-carbon pathway not only requires optimized mix designs with lower clinker/cement content but also other interventions that could reduce the carbon footprint of concrete in its value chain. Current codes specify minimum cement contents for concrete mixes intended to preserve durability in various exposure classes, but the cement type is usually not specified. Codes also specify an increase in the amount of reinforcing steel required for reinforced concrete members with a matrix strength above 50 MPa, partially counteracting the potential carbon benefits of reducing the amount of concrete used for a given element employing high-strength concrete. This places two “hard” constraints on reinforced concrete design for minimum carbon per unit of structural performance. With these two practical constraints in place, in this paper, the influence of several materials and design parameters are discussed and assessed for the carbon reduction potential of concrete systems. The parameters considered are i) lowering the clinker content in concrete mixes whilst complying with the code-specified minimum cement content for required durability ii) producing better quality concrete e.g., by minimising the margin between target mean strength and required characteristic compressive strength and iii) reducing partial factors of safety for concrete at the design stage while assuming the minimum load requirements. It was quantified that there is a significant potential reduction in the carbon footprint of the concrete and the reinforced concrete element, when these parameters are varied from what is specified in the code.