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Effect of hydration aging and water binder ratio on microstructure and mechanical properties of sprayed concrete

  • Cementitious Materials
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Abstract

In order to study the durability of sprayed concrete (shotcrete), effects of different hydration aging and water-binder ratio (w/b) on the microstructure of cement paste and basic mechanical properties of test specimens were investigated. The phase composition, mass percentage of ettringite and portland in hydration production and microstructure were characterized by X-ray diffraction (XRD), thermo gravimetry-differential scanning calorimetry (TG-DSC) and scanning electron microscopy (SEM), respectively. The experimental results showed that changes in phase composition was more significant than those of water-binder ratio. With hydration aging and water-binder ratio increased, the mass percentage of ettringite and portland was decreased from 4.42%, 1.49% to 3.31%, 1.35%, respectively and the microstructure of paste was significantly compacted. Likewise, the mechanical properties including cubic compressive strength and splitting tensile strength were rised obviously.

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Authors and Affiliations

  1. College of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China

    Ditao Niu  (牛荻涛), Jiabin Wang  (王家滨) & Yan Wang

  2. College of Material and Mineral Resources, Xi’an University of Architecture and Technology, Xi’an, 710055, China

    Yan Wang

Authors
  1. Ditao Niu  (牛荻涛)
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  2. Jiabin Wang  (王家滨)
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  3. Yan Wang
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Corresponding author

Correspondence to Jiabin Wang  (王家滨).

Additional information

Funded by the National Natural Science Foundation of China (Nos. 51278403 and 51308445), and the Program for Innovative Research Team in University (IRT 13089)

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Niu, D., Wang, J. & Wang, Y. Effect of hydration aging and water binder ratio on microstructure and mechanical properties of sprayed concrete. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 30, 745–751 (2015). https://doi.org/10.1007/s11595-015-1222-6

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  • DOI: https://doi.org/10.1007/s11595-015-1222-6

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