Abstract
In this study, the use of sodium carbonate anhydrous (Na2CO3) to enhance the reactivity of bottom ash (BA) in the ordinary Portland cement (OPC) system was investigated. The presence of Na2CO3 exerted an interactive effect on the hydration mechanism of the BA-OPC composite, leading to a significant enhancement in the pozzolanic reactions between BA and calcium hydroxide, following the improved silicate reactions. Consequently, remarkable improvements were observed in the mechanical properties of the BA-OPC composite with an extremely small amount of the activator. Specifically, the sample containing 0.025 % Na2CO3 exhibited the highest increase in compressive strength compared to the sample without Na2CO3, showing an improvement of 35.4 % at 7 days and 70.6 % at 28 days. Based on the proposed method, the reactivity of BA and silicate phases can be enhanced which contributes to the sustainable development of BA-OPC composite.
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