Abstract
Supersulfated cement (SSC) has been known as a low-carbon cementitious materials due to its low-clinker requirement but high-slag consumption. However, the slow property gain rate, especially at the early ages, together with the long-term drawbacks introduced by the physiochemical characteristics of SSC, has primarily blocked its application. In this work, a novel property-gain regulation technique by applying nanoSiO2 (NS) modification on the binding system was reported. Firstly, the macro-property of SSCs with NS was presented, and then the hydration features, as well as the physiochemical properties, were reported. It was found that 3 wt.% NS addition could increase the 90-day compressive strength of SSC to 100%, and the critical pore threshold value can be reduced by an order of magnitude. Quantitative analysis results showed that the modification of the chemical compositions and the variation of the resulting binders contribute to these significant changes. All these results highlighted a novel technique of developing a low-carbon cementitious binder with good performance through nano-engineering.
Improving properties of supersulfated cement by regulating its physiochemical features through nanoSiO2-modification
Supersulfated cement (SSC) has been known as a low-carbon cementitious materials due to its low-clinker requirement but high-slag consumption. However, the slow property gain rate, especially at the early ages, together with the long-term drawbacks introduced by the physiochemical characteristics of SSC, has primarily blocked its application. In this work, a novel property-gain regulation technique by applying nanoSiO2 (NS) modification on the binding system was reported. Firstly, the macro-property of SSCs with NS was presented, and then the hydration features, as well as the physiochemical properties, were reported. It was found that 3 wt.% NS addition could increase the 90-day compressive strength of SSC to 100%, and the critical pore threshold value can be reduced by an order of magnitude. Quantitative analysis results showed that the modification of the chemical compositions and the variation of the resulting binders contribute to these significant changes. All these results highlighted a novel technique of developing a low-carbon cementitious binder with good performance through nano-engineering.
