利用煤矸石粉制备生态型超高性能混凝土的设计研究

Study of the design and preparation of a sustainable ultra-high performance concrete using coal gangue powder

超高性能混凝土(Ultra-High Performance Concrete, UHPC)是一种性能优异的水泥基材料,但因其水泥用量较大,造成数倍于普通混凝土的二氧化碳排放量。基于颗粒紧密堆积理论,将煤矸石粉作为水泥替换材料制备UHPC,旨在降低传统UHPC的碳排放。对煤矸石粉基UHPC进行系统表征发现煤矸石粉掺加劣化了UHPC堆积结构和工作性能,但对UHPC强度影响较小,含有高掺量(>40%)煤矸石粉的UHPC强度仍大于120 MPa。本研究在降低UHPC高能耗的同时也为煤矸石的回收利用提供了新思路。

Ultra-high performance concrete(UHPC)is a cement-based material with excellent 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 replacing cement with coal gangue powder(CGP),which can effectively reduce carbon dioxide emissions 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.