Study of the design and preparation of a sustainable ultra-high performance concrete using coal gangue powder
Ultra-high performance concrete(UHPC)is a cement-based material with excel-lent performance.However,it causes high carbon dioxide emission due to the large content of cement.Based on the particle dense packing theory,this study prepares UHPC by repla-cing cement with coal gangue powder(CGP),which can effectively reduce carbon dioxide e-missions and provide ideas for CGP management.The results show that the addition of CGP deteriorates the packing structure and working performance of UHPC while having slight effect on the strength of UHPC.Consequently,the strength of UHPC with a high content(>40%)CGP is greater than 120 MPa,which not only reduces the high energy consumption of UHPC but also provides a new idea for the recycling of CG.
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