Abstract
This study investigated the air aging converter (Basic Oxygen Furnace, BOF) slag aggregate mortar with pulverized fly ash (PFA) and ferronickel slag (FNS). The chemical composition and mineralogical constituents of BOF incorporated mortar were analyzed. Setting time, flowability, compressive strength, and length change were measured to evaluate the fundamental properties of BOF mortar. The X-ray CT analysis was employed to observe the effect of converter slag in the cement matrix visually. The results showed that the hydration of BOF generated a pore at the vicinity of the aggregate, which decreased the compressive strength and increased the length change of mortar. However, the PFA or FNS incorporation of PFA or FNS can decrease the alkalinity of pore solution and subsequently reduce the reactivity of BOF aggregate. Thus, the incorporation of PFA and FNS can be a way to eliminate the disadvantage of BOF, such as volume expansion.
Highlights
The cement industry grows at 6% every year [1] because concrete is used as construction material worldwide
This study investigated the air aging converter slag aggregate mortar with pulverized fly ash (PFA) or/and ferronickel slag (FNS), which is currently emerging for its feasibility as a cement admixture
The converter slag, known as Basic Oxygen Furnance (BOF) slag, used in this experiment was derived from a steel company in Chungnam, Korea
Summary
The cement industry grows at 6% every year [1] because concrete is used as construction material worldwide. Converter slag is a by-product of steelmaking produced during the conversion of pig iron into steel in a basic oxygen furnace This solid waste has variable oxide composition with a high amount of CaO, Fe2O3 with minor oxides of SiO2, and MgO [16], which are present in ordinary Portland Cement (OPC). Despite these similar mineral phases of converter slag compared to OPC, its utilization is very low due to the presence of free lime (CaO) and free MgO, which can induce unstable volume expansion. X-ray CT analysis was employed to visually evaluate the effect of incorporation of converter slag into the cement matrix
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