Investigation on mechanical properties, durability and micro-structural development of steel slag blended cements

Application of Ground Granulate Blast Furnace Slag-Steel Slag Composite Binder in a Massive Concrete Structure under Severe Sulphate Attack

“…As shown in Figure 2(a), as the cement replacement ratio increased, the exothermic peak of the composite binder is delayed, and the exothermic peak value of the composite binder decreases. In addition, the exothermic rate of the composite binder is lower than that of the plain cement after approximately 2 d. As shown in Figure 2(b), the cumulative hydration heat of the composite binder is distinctly lower than that of the plain cement within 3 d. These results indicate that the hydration activities of the GGBS and steel slag are much lower than those of the cement during the early stages, which is consistent with previous findings [8,12,18]. Figures 3(a) and 3(b) show the exothermic rate curves and cumulative heat curves during the hydration of plain cement and the composite binders at 45 ∘ C, respectively.…”

“…However, the large particles in steel slag have few cementitious properties, and the interfaces between the large particles of steel slag and calcium silicate hydrate gels are weak points that may induce failures [11]. Additionally, large amounts of steel slag tend to result in a coarser pore structure for the hardened paste [12], yielding a negative effect on the strength and durability of the concrete [13]. In some studies, ground granulate blast furnace 2 Advances in Materials Science and Engineering slag-steel slag composite binder was used as a composite mineral admixture and shown to prolong the setting time of the cement, improve the fluidity of fresh concrete, refine the pore structure of hardened paste, and result in a satisfactory compressive strength for the concrete [14,15].…”

Influence of Glass Powder and Steel Slag on Properties of Concrete: A Review

“…Some other researchers have also reported the beneficial role of slag on fire resistance of concrete [13] [14]. Steel slag contain cementing properties due to high amount of silica and calcium, but due to low cooling process its hydration process is very low compared to normal cement [15]. Tsakiridis et al [16] have utilized steel slag for production of Portland cement clinker.…”

Study on Cementitious Properties and Hydration Characteristics of Steel Slag

“…Steel slag is a kind of massive byproduct when lime is added to extract impurities during steelmaking, and its amount is about 15-20% of crude steel production [12]. The annual amount of steel slag is about 80 million tons in China, and the accumulated amount is about 500 million tons.…”

“…However, its application in the concrete industry is still minor. Wang et al [13] and Zhang et al [14] indicated that steel slag be used as mineral admixture in concrete and cement. The mineral compositions of steel slag include calcium aluminates (C 3 A, C 12 A 7 ), calcium ferrites (C 4 AF, C 2 F), calcium silicates (C 3 S, C 2 S), RO phase (CaO-MgOMnO-FeO solid solution), free MgO, free CaO, Fe 3 O 4 , and so on [15][16][17][18][19][20].…”