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Corrosion resistance of steel bar and chloride binding capacity of cementitious materials with internal chloride

A comparative study on Portland cement, geopolymer, inter-ground and gap-graded blended cements
  • Yongmin Yang
  • Tongsheng ZhangEmail author
  • Zhaoheng Li
  • Kexin Zhao
  • Jiangxiong Wei
  • Qijun Yu
Article
  • 20 Downloads

Abstract

During the construction of islands and reefs far from the mainland, local marine materials are expected to be used in concrete from the viewpoint of economy, rapid and convenient construction. As abundant chloride with local marine materials is involved into concrete, ordinary Portland cements are not recommended due to their low chloride binding capacity and poor corrosion resistance of steel bar. In the present study, geopolymer, gap-graded blended cement as well as Portland cement and inter-ground blended cement as references were mixed directly with NaCl to simulate the chloride in local marine materials, their hydration process, mechanical properties, corrosion resistance of steel bar and microstructure were compared. The results showed that the hydration processes of blended cements were accelerated after introducing NaCl, resulting in a dramatic increase in early strengths. In contrast, the compressive strengths of Portland cement and geopolymer kept constant, whereas the late flexural strengths reduced gradually. Geopolymer had slightly better corrosion resistance of steel bar than Portland cement due to low porosity and pore size refinement, and gap-graded blended cement presented a superior corrosion resistance of steel bar even in chloride-rich environment, as the chloride binding capacity of gap-graded blended cement paste was about 4 times higher than that of geopolymer.

Keywords

Gap-graded blended cement Geopolymer Mechanical properties Chloride binding capacity Corrosion resistance 

Notes

Acknowledgements

This work was funded by the National Key Research and Development Program (2016YFB0303502), the Water Resource Science and Technology Innovation Program of Guangdong Province (2016-23), the Guangdong Science and Technology Program (2016A020221009), the Guangdong Special Support for Youth Science and Technology Innovation Talents (2015TQ01C312) and the Pearl River Science and Technology Nova Program of Guangzhou (201610010098). Their financial supports are gratefully acknowledged.

Compliance with ethical standards

Conflict of interest

The authors declared that they have no conflicts of interest to this work.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringSouth China University of TechnologyGuangzhouChina
  2. 2.Zhongkai University of Agriculture and EngineeringGuangzhouChina
  3. 3.Guangdong Research Institute of Water Resources and HydropowerGuangzhouChina
  4. 4.School of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhouChina

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