Abstract

The main intention of this research is to reuse the industrial by product ferrochrome slag and silica fume as a partial replacement of natural coarse aggregate and fly ash, respectively for the production of Geopolymer concrete with improved mechanical properties. Natural coarse aggregate was replaced by ferrochrome slag (FS) in varying percentages from 0 to 40% by weight. Fly ash was replaced by silica fume (SF) at different percentages 0 to 15% by weight. The combined effect of FS and SF was studied by developing Geopolymer concrete. Tests for compressive strength, splitting tensile strength and flexural strength of the GPC have been carried out at 7, 28 and 90 days of curing. The scanning electron microscope (SEM) was performed for the inspection of surface texture of the microstructure of the hardened samples. X-ray diffraction (XRD) was conducted to investigate the crystallinity of the mineral phases of the material as well as the activation product. Fourier transformed infrared spectroscopy (FTIR) was carried out to know the degree of polymerization of the samples. At 28 days, compressive strength, splitting tensile strength and flexural strength of GPC produced by replacing 30% FS and 10% SF increases by 38.9%, 47% and 20.4% respectively.

Acronyms: CS Compressive strength; FS Ferrochrome slag; NCA Natural coarse aggregates; NFA Natural fine aggregates.

摘要

本研究的主要目的是再利用工业副产品铬铁矿渣和硅粉作为天然粗骨料和粉煤灰的部分替代品，分别用于生产具有改善力学性能的地质聚合物混凝土。天然粗骨料被铬铁渣 (FS) 取代，其重量百分比从 0 到 40% 不等。粉煤灰被不同重量百分比的硅灰 (SF) 取代，重量百分比为 0 至 15%。通过开发地质聚合物混凝土，研究了 FS 和 SF 的组合效应。GPC 的抗压强度、劈裂抗拉强度和抗弯强度测试分别在固化 7、28 和 90 天进行。扫描电子显微镜 (SEM) 用于检查硬化样品的微观结构的表面纹理。进行 X 射线衍射 (XRD) 以研究材料的矿物相以及活化产物的结晶度。进行傅里叶变换红外光谱（FTIR）以了解样品的聚合度。替换30%FS和10%SF生产的GPC在28天抗压强度、劈裂抗拉强度和抗弯强度分别提高了38.9%、47%和20.4%。

首字母缩略词： CS 抗压强度；FS铬铁渣；NCA 天然粗骨料；NFA 天然细骨料。