In this paper, the combined use of γ-dicalcium silicate and slag for possible coupling effect on carbonation resistance was investigated. The potential of the use of γ-C₂S to impart carbonation immunity to slag blended materials at early age has not been fully explored so far. In this regard, 15, 30 and 50% slag blended cement paste and mortar samples containing 0, 5, 10, 15, 20% of γ-C₂S in replacement of cement were manufactured before undergoing accelerated carbonation for 3, 7 and 28 days. Then, techniques of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and Mercury Intrusion Porosimetry (MIP) were utilized to analyze the carbonation characteristics. Results show that the carbonation of γ-C₂S in the presence of slag is effective in CO₂ sequestration, pore refinement and surface hardening. Moreover, an optimum combination of 5% γ-C₂S and 30% slag exists for achieving the smallest carbonation depth which is 78% lower than the observed maximum, from which certain coupling effect was identified. Lastly, a conceptual model was presented to probe into the mechanism. Such research shall be conducive to the search for next-generation low carbon concrete with improved durability.

本文研究了将γ-硅酸二钙和矿渣联合使用对可能的抗碳化性能的耦合作用。使用γ-C的电位₂秒至传授碳化免疫力在早期去渣混合的材料还没有完全到目前为止探讨。在这点上，图15，30和50％的炉渣混合水泥膏和含有0，5，10，15，γ-C的20％砂浆样品₂在更换水泥第正在经历加速碳化为3,7和28之前制造天。然后，利用X射线衍射（XRD），傅立叶变换红外光谱（FT-IR），热重分析（TGA）和水银压入孔率法（MIP）等技术分析了碳化特性。结果表明，碳酸化γ-C ₂炉渣存在下的S对CO ₂隔离，细孔细化和表面硬化有效。另外，5％γ-C的最佳组合₂ S和30％的炉渣存在用于实现最小的碳化深度是78％，比观察到的最大，从该一定的耦合效应被鉴定降低。最后，提出了一个概念模型来探讨该机制。这样的研究将有利于寻找具有改进耐久性的下一代低碳混凝土。