In this study, various dosages of limestone (LS) powder (10, 15 and 20%) of varying fineness were used as a replacement for cement to investigate its influence on the selected properties of high-performance concrete (HPC). The efficiency factor and carbon dioxide (CO₂) equivalent emissions were evaluated for life cycle assessment of HPC mixtures containing LS powder. The workability, compressive, split tensile and flexural strength, semi-adiabatic temperature rise and autogenous shrinkage of HPC were investigated. The results indicated that workability and density were enhanced by replacing cement with fine and intermediate LS powder in comparison with coarse LS powder. The compressive, split tensile and flexural strengths were all reduced by increasing the replacement level of fine, intermediate and coarse LS powder at all curing ages. Furthermore, higher temperature peaks and high autogenous shrinkage were observed in fine LS mixtures due to the nucleation effect and the accelerating hydration reaction of fine LS particles. The highest efficiency factor and highest reduction in carbon dioxide equivalent emissions was observed in the mixtures containing 20% coarse LS powder followed by the intermediate LS powder. This research work may help in understanding the role of varying finenesses of LS powder as a viable material in high-performance-based composites.

中文翻译：

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评估在高性能混凝土中使用石灰石粉的力学性能和环境影响

在这项研究中，不同细度的石灰石 (LS) 粉末（10、15 和 20%）的不同剂量被用作水泥的替代品，以研究其对高性能混凝土 (HPC) 选定性能的影响。效率因子和二氧化碳（CO ₂) 对含有 LS 粉末的 HPC 混合物的生命周期评估进行了等效排放评估。研究了HPC的可加工性、抗压强度、劈裂强度和抗弯强度、半绝热温升和自收缩。结果表明，与粗LS粉末相比，用细和中间LS粉末代替水泥提高了和易性和密度。通过在所有固化年龄增加细、中间和粗 LS 粉末的更换水平，压缩、剖分拉伸和弯曲强度都降低了。此外，由于成核效应和细 LS 颗粒的加速水合反应，在细 LS 混合物中观察到更高的温度峰和高自收缩。在含有 20% 粗 LS 粉末的混合物中观察到最高的效率因子和最大的二氧化碳当量排放减少量，然后是中间 LS 粉末。这项研究工作可能有助于理解不同细度的 LS 粉末作为一种可行材料在高性能复合材料中的作用。