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Properties of Alkali-activated Yellow River Sediment-slag Composite Material

论文摘要

In order to consume the Yellow River sediment as much as possible and improve the longterm stability of the Yellow River, Yellow River sediment was utilized as the main raw material to produce a composite material. Ca（OH）2 was used as alkali-activator to activate the active SiO2 and Al2O3 compositions in Yellow River sediment. 10 wt% slag was added into the mixture to further improve the strength of the composites. The effect of activity rate of the Yellow River sediment and dosage of Ca（OH） 2 on the compressive strength of the Yellow River sediment-slag composite material at different curing ages was researched. XRD, SEM/EDS, light microscope and FTIR were used to further explore the products and the microstructure of the composite material. Results showed that the active ratio of sediment had a great influence on the compressive strength of specimen. In addition, the compressive strength of specimen increased with the increase of Ca（OH）2dosage and curing age. When the dosage of Ca（OH）2 was more than 5 wt% as well as the curing age reached 90 days, the compressive strength of the composite material could meet the engineering requirement. In the alkali-activated process, the main product was hydrated calcium silicate（C-S-H） gel, which filled up the gaps among the sediment particles and decreased the porosity of the specimen. Moreover, the CaCO3 produced by the carbonization of the C-S-H gel and excess Ca（OH）2 also played a role on the strength.

论文目录

  • 1 Introduction
  • 2 Experimental
  •   2.1 Raw material
  •   2.2 Activity rate
  •   2.3 Alkali-activator
  •   2.4 Casting, curing and testing
  • 3 Results and discussion
  •   3.1 The effect of activity rate of sediment on the compressive strength
  •   3.2 The effect of Ca （OH） 2 dosage and curing age on compressive strength
  •   3.3 XRD analysis
  •   3.4 Infrared spectroscopic analysis
  •   3.5 Microstructural analysis
  • 4 Conclusions

    • 文章来源

    类型: 期刊论文

    作者: 李高年,WANG Baomin,刘慧

    来源: Journal of Wuhan University of Technology(Materials Science) 2019年01期

    年度: 2019

    分类: 工程科技Ⅰ辑

    专业: 材料科学

    单位: Institute of Building Materials, School of Civil Engineering, Dalian University of Technology,Yellow River Institute of Hydraulic Research

    基金: Funded by the National Natural Science Foundation of China(Nos.51578108,51878116,51809109),the Fundamental Research Fund for the Central Universities(No.DUT18ZD219),National Key R&D Program of China(No.2017YFC0504506)

    分类号: TB33

    页码: 114-121

    总页数: 8

    文件大小: 1811K

    下载量: 40

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