Evaluation of slag characteristics on the reaction kinetics and mechanical properties of Na 2 CO 3 activated slag

Abstract

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Phase modification induced drying shrinkage reduction on Na2CO3 activated slag by incorporating Na2SO4

“…Figure 3 depicts the heat release of all mixtures with different activators and the process generally can be classified into five stages which is in accordance with previous researches [14,[31][32][33]. The time to reach reaction peak (TRRP) of sodium carbonate activation is shortened to around 50 h compared to previous reports [15,34], which is in line with our previous study that the reaction can be significantly accelerated by controlling the slag characteristics [21]. As for the activation of sodium sulfate, the reaction is slightly different from previous studies [26,27] by giving an intensive reaction peak after 8 h of casting.…”

“…The application of a near-neutral salt, Na 2 CO 3 , as an activator in AAS has been attracting great interest, attributed to its advantage in terms of low alkalinity, low cost and good performance [19,20]. Slow reaction of sodium carbonate activation has been often reported, which nevertheless can be compensated by controlling the slag characteristics [21]. However, the latest results show that the sodium carbonate activated slag suffers from high drying shrinkage [22,23].…”

“…Sodium carbonate activation is often reported to be slow. Nevertheless, slag characteristics [21] have been found to be an important factor in controlling the reaction kinetics, and a high early strength is achievable by adjusting the fineness of slag particles. In this study, a compressive strength of 28.89 MPa after 3 days of curing is observed for the sodium carbonate activated slag.…”

Assessing the chemical involvement of limestone powder in sodium carbonate activated slag

“…precipitation of CaCO 3 and gaylussite [35]. Due to the high concentration of CO 3 2-anion provided by the activators and low saturation limit of CaCO 3 , the precipitation and formation of gaylussite will quickly occur when slag starts to release Ca 2?…”

Assessment of Alkali Activation Potential of a Polish Ferronickel Slag

“…The materials produced have diverse properties depending on the characteristics of the source materials, the additives, and the experimental conditions used. In this context, slags with varying content of Fe, Si, Al and Ca have been investigated, including ground granulated blast furnace slag mixed with fly ash [26][27][28], ferronickel (FeNi) slag [2,29,30] or mixtures of FeNi slag, construction and demolition wastes and red mud [31], mixtures of steel slag and metakaolin or kaolin [32,33], slags from non-ferrous metallurgy [34], and mixtures of fly ash and lead slag [35].…”