Abstract
The potential use of ferronickel slag (FNS) as supplementary cementitious material has been widely researched in recent years. Although much research was carried out on utilizing FNS as a binder, its advantages and disadvantages are still not clear. To properly use FNS as a cement replacement, this paper summarizes the following. (1) Changes expected on the oxide composition of FNS powder are due to the forming ores, fluxing stone, and cooling method. (2) The decreasing of the hydration heat evolution rate was detected by hydration heat evolution test and this is due to the low content of CaO and Al2O3 component in FNS. (3) It was found that the incorporation of FNS forms a dense pore structure more than cement mix and this is due to the secondary hydration reactions. (4) Hydration characteristics of FNS were assessed by pozzolanic reactions unexpectedly detected and incorporation of FNS creates C-S-H gel and hydrotalcite. (5) The development of strength was tested by compressive strength, splitting tensile strength, and flexural strength. From the results, the reduction of compressive strength was detected at an early age but substantially increasing at the long-term curing ages. However, splitting tensile strength and flexural strength of concrete have shown various trends. (6) There is an improvement in the resistance to chloride penetration and sulfate attack while susceptible to carbonation. This is induced by the lowered pH in pore solution due to the reduction of Ca(OH)2 by substituting FNS binder. Finally, (8) ternary blended mixtures with conventional cementitious materials are an option to properly use FNS as a binder.
Highlights
Ordinary Portland cement (OPC) has been widely used in various parts of the world until recently
(4) Hydration characteristics of ferronickel slag (FNS) were assessed by pozzolanic reactions unexpectedly detected and incorporation of FNS creates C-S-H gel and hydrotalcite. (5) e development of strength was tested by compressive strength, splitting tensile strength, and flexural strength
A summary of the test results of incorporating FNS as a binder is displayed in Table 3. e fresh concrete properties of FNS blends demanded relatively less water than OPC, and the flow tests confirmed FNS addition improves the mortar workability
Summary
Ordinary Portland cement (OPC) has been widely used in various parts of the world until recently. Portland cement mixed with other materials, such as ground granulated blast furnace slag (GGBS) from pig iron smelting or fly ash from coal-fired power plants (PFA), have increased popularity. These traditional admixtures already cannot be obtained in many places due to the surge in use. Finding new construction materials is an important issue for the replacement of cement and for complementation of conventional admixtures From this point of view, research on the direction in which ferronickel slag (FNS) can be used as a substitute for cement is actively conducted. Its advantages and disadvantages as a cement replacement are not clearly determined, despite many research projects conducted in the field. erefore, in order to properly use FNS, this paper summarizes recent research about using FNS as cementitious materials
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
