Fantilli Alessandro P, Tondolo Francesco, Chiaia Bernardino, Habert Guillaume
Politecnico di Torino, 10129 Torino, Italy.
ETH Zurich, 8093 Zurich, Switzerland.
Materials (Basel). 2019 Apr 16;12(8):1248. doi: 10.3390/ma12081248.
If supplementary cementitious materials (SCMs) are used as binders, the environmental impact produced by cement-based composites can be reduced. Following the substitution strategy to increase sustainability, several studies have been carried out with the aim of measuring the mechanical properties of different concrete systems, in which a portion of Portland cement was substituted with SCMs, such as fly ashes. On the other hand, studies on the structural behavior of reinforced concrete (RC) elements made with SCMs are very scarce. For this reason, in this paper, a new procedure is introduced with the aim of fulfil a new limit state of sustainability, in accordance with the serviceability and ultimate limit states required by building codes. Although the environmental impact of concrete decreases with the reduction of cement content, the proposed approach shows that the carbon dioxide emission of an RC beam is not a monotonic function of the substitution rate of cement with SCMs. On the contrary, there are favorable values of such substitution rates, which fall within a well-defined range.
如果使用辅助胶凝材料（SCMs）作为胶凝材料，可以降低水泥基复合材料产生的环境影响。遵循替代策略以提高可持续性，已经开展了多项研究，旨在测量不同混凝土体系的力学性能，其中一部分波特兰水泥被SCMs（如粉煤灰）替代。另一方面，关于用SCMs制成的钢筋混凝土（RC）构件结构性能的研究非常稀少。因此，本文引入了一种新方法，旨在根据建筑规范要求的适用性和极限状态，实现一种新的可持续性极限状态。虽然随着水泥含量的减少，混凝土的环境影响会降低，但所提出的方法表明，RC梁的二氧化碳排放量并非水泥被SCMs替代率的单调函数。相反，存在一些有利的替代率值，它们落在一个明确界定的范围内。
