Mechanical Property and Microstructure of Alkali-activated Yellow River Sediment-coal Slime Ash Composites

摘要：

　　This work focuses on the production of a new composite material using Yellow River sediment and coal slime ash via alkali-activated method.XRD,FTIR and SEM/EDS were used to characterize the alkali-activated products and microstructure of the composite material.Compressive strength was tested to characterize the mechanical property of the composite material.It was found that,the compressive strength of the Yellow River sediment-coal slime ash composites increases as the added Ca(OH)2 content grows.The compressive strength increases fast in the early stage but slowly after 28 days.The strength of the composites can be significantly improved via the addition of small amount of NaOH and gypsum.The products (C-S-H,ettringite and CaCO3),especially C-S-H,make much contribution to the enhancement of strength.The highest strength of the composites could reach 14.4 MPa after 90 days curing with 5% Ca(OH)2,0.2% NaOH and 7.5% gypsum.The improved properties of the composites show great potential of utilizing Yellow River sediment for inexpensive construction materials.

关键词： Yellow River sediment coal slime ash alkali activation compressive strength microstructure

作者: Gaonian Li Baomin Wang Hui Liu Wanzeng Song Junnan Han

作者单位: School of Civil Engineering, Dalian University of Technology, Dalian 116024, China Yellow River Institute of Hydraulic Research, Zhengzhou 450003, China

会议类型: 国内会议

会议名称: 中国大坝工程学会水库泥沙处理与资源利用技术专业委员会成立大会

会议地点: 长沙

会议语种:英文

页码: 254-266

在线出版日期: 2017-11-09（万方平台首次上网日期，不代表论文的发表时间）