Study on the Pore Structure Characteristics of Ferronickel-Slag-Mixed Ternary-Blended Cement

Abstract

Pore structure development in Portland cement, fly ash, or/and ferronickel slag (FNS) was investigated using mercury intrusion porosimetry and X-ray CT tomography. The progress of hydration was observed using X-ray diffraction (XRD) analysis and compressive strength while durability of concrete was monitored by chloride penetration resistance and chloride profiles. Mercury intrusion porosimetry (MIP) results suggested that the blended cement had a higher porosity while lower critical pore size. The major reason to this increased porosity was the formation of meso and micro pores compared to ordinary Portland cement (OPC). In terms of chloride transport, replaced cement, especially ternary-blended cement had higher resistance to chloride transport and exhibited slightly lower development of compressive strength. X-ray CT tomography shows that the influence of pore structure of ternary-blended cement on the ionic transport was strongly related to the pore connectivity of cement matrix.

X-ray CT Analysis of FNS Mortars Mixed with Converter Slag Fine Aggregate

“…The main chemical components of the FNS powders are SiO2, MgO, and Fe2O3. The CaO contents of FNS were counted for only 6.28% which is lower than OPC [15]. BOF fine aggregate has mainly consisted of CaO, SiO2 and Fe2O3, thus BOF can be classified as high calcium and ferrous materials.…”

“…The materials used in this study were OPC and electric arc furnace FNS powder produced by Korean company "P." The particle size distribution is shown in Figure 1 (modified from [15]. Fig.…”

Experimental Investigation on the Effect of Converter Slag Aggregate for Blended Mortar Based on CT Scanning

“…In the case of OPC, alite (C 3 S, 3CaO•SiO 2 ) and belite (C 2 S, 2CaO•SiO 2 ) were the main clinkers, while other clinkers such as gypsum, periclase, and brownmillerite (4CaO•Al 2 O 3 •Fe 2 O 3 ) accounted for lower quantities. The XRD patterns showed high silica contents for PFA, while the main composition of FNS accounted for forsterite (Mg 2 SiO 4 ) and fayalite (Fe 2 SiO 4 ), which have a crystalline nature [22]. The forsterite showed a late hydration property, which takes about 2 years for complete reaction [23].…”

Synergistic Activation of Electric Furnace Ferronickel Slag by Mechanical Grinding and Chemical Activators to Prepare Cementitious Composites

“…This slag is generated through water quenching, and its chemical composition is influenced by factors such as raw ore type and smelting processes. The predominant constituents of this slag are MgO, SiO 2 , Al 2 O 3 , and FeO [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. The slag contains various minerals, such as olivine, tenacious pyroxene, magnesium peridotite, turbidite, and amorphous minerals [ 8 ].…”