The current study explored the feasibility of re-use of ferrochrome slag (FS), a waste byproduct from the ferrochrome industry as a replacement to fine aggregate in self-compacting concrete (SCC) with cement and fly ash as binders. The study investigated the mechanical and durability characteristics of SCC of M25 grade, incorporating FS in lieu of fine aggregate, up to 60 % replacement levels. Albeit workability of fresh concrete decreased with the increase of FS content, they were within the recommended limits of EFNARC for SCC. Considerable decreases in compressive, tensile and flexural strengths were observed in the mixtures with FS contents above 40 %. Slightly better performances in terms of water absorption, sorptivity, chloride ion permeability and sulphate attack were found in the concretes partially blended with FS. Leaching of chromium (Cr) from FS-incorporated self-compacting concrete samples were within the Indian discharge limits. Microstructural studies were conducted to decipher the arrangement of components in the concrete as well as determine the elemental composition of ferrochrome slag. Functional analysis of variance (ANOVA) was conducted to determine the significance of functional components in explaining the variability of the mechanical properties expressed as continuous functions. The test findings indicate that there is no statistical difference in the compressive strength and split tensile strength as a result of substituting a portion of sand with FS. Nevertheless, a rise in flexural strength is noticed after surpassing a 5 % substitution.

中文翻译：

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使用函数方差分析评估以铬铁矿渣为细骨料的混合自密实混凝土的性能

目前的研究探讨了重新利用铬铁矿渣（FS）（铬铁工业的一种废弃副产品）作为水泥和粉煤灰作为粘合剂的自密实混凝土（SCC）中细骨料的替代品的可行性。该研究调查了 M25 级 SCC 的机械和耐久性特性，其中使用 FS 代替细骨料，替代水平高达 60%。尽管新拌混凝土的和易性随着 FS 含量的增加而降低，但仍处于 EFNARC 针对 SCC 的推荐限值内。在 FS 含量高于 40% 的混合物中，观察到压缩强度、拉伸强度和弯曲强度显着下降。部分掺有 FS 的混凝土在吸水率、吸着性、氯离子渗透性和硫酸盐侵蚀方面的性能稍好。掺有 FS 的自密实混凝土样品中铬 (Cr) 的浸出量在印度排放限值范围内。进行微观结构研究是为了破译混凝土中组分的排列以及确定铬铁矿渣的元素组成。进行方差函数分析 (ANOVA) 以确定函数成分在解释表示为连续函数的机械性能变异性方面的重要性。试验结果表明，用FS代替部分砂子的抗压强度和劈裂抗拉强度没有统计学差异。然而，在替代量超过 5% 后，我们注意到抗弯强度有所提高。