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Study on the Activity of Aeolian Sand Powder and Alkali Excitation Modification

  • GenFeng Li
  • XiangDong Shen
  • Qi Yuan
  • YuXiao Zou
  • Lu Xiong
Effective Production and Recycling of Powder Materials
  • 39 Downloads

Abstract

Aeolian sand powder samples were made from aeolian sand which was obtained from the Kubuqi Desert of Inner Mongolia, China. With the method of boiling, the effects of different mass fraction sodium sulfate and sodium hydroxide on the dissolution of active substances of aeolian sand powder were studied. Meanwhile, based on the “alkali activation” theory, the type of activator, the quality fraction and the pre-curing temperature were shown to be variable, and the effect of aeolian sand powder modification is discussed through the test of the strength of aeolian sand powder–cement mortar. Micro-methods such as the total spectral semi-quantitative analysis, x-ray diffraction, field emission scanning electron microscopy, and nuclear magnetic resonance technology were used to study the mineral composition, microstructure and pore characteristics, and then to discuss the feasibility of aeolian sand powder as an alkali-activated material. The results showed that sodium sulfate had a better activation effect on the aeolian sand powder compared with that of sodium hydroxide. The activation rate of aeolian sand powder increases with the increase of the mass fraction of the activator, and, with the increase of the alkalinity of the solution, the dissolution of SiO2 and other active substances in the aeolian sand powder increases gradually. The effect of sodium sulfate on the aeolian sand powder is better than that of sodium hydroxide, and when the mass fraction of sodium sulfate is 2%, the volume of the aeolian sand powder is 15%. When the pre-curing temperature is 35°C, the modification effect of aeolian sand powder is better and the activity index reaches 108.2%. Under the effects of the sodium sulfate, 2.2% and 2.6% active SiO2 and CaO were, respectively, dissolved from the aeolian sand powder. Then, a polymerization reaction occurred under the combined action of the temperature, which generated the needle-shaped hydration product ettringite with a good development state. Meanwhile, the ratio of the inner 20-nm hole of the aeolian sand powder–cement mortar specimen reached 85.69%, and there were many disconnected capillary pores, the irreducible fluid saturation was as high as 94.311%, and the gelling property was good.

Notes

Funding

Fund Program: National Natural Science Foundation of China (51769025, 51569021); The Doctorial Innovation Fund of the Inner Mongolia Autonomous Region (B20171012918).

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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • GenFeng Li
    • 1
  • XiangDong Shen
    • 1
  • Qi Yuan
    • 1
  • YuXiao Zou
    • 1
  • Lu Xiong
    • 1
  1. 1.College of Water Conservancy and Civil Engineering InnerMongolia Agricultural UniversityHohhotChina

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