Advances in concrete construction

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Sustainable SCC with high volume recycled concrete aggregates and SCMs for improved mechanical and environmental performances

  • Zhanggen Guo (School of Civil Engineering, Nanjing Tech University) ;
  • Ling Zhou (School of Civil Engineering, Nanjing Tech University) ;
  • Qiansen Sun (School of Civil Engineering, Nanjing Tech University) ;
  • Zhiwei Gao (School of Civil Engineering, Nanjing Tech University) ;
  • Qinglong Miao (School of Civil Engineering, Nanjing Tech University) ;
  • Haixia Ding (School of Civil Engineering, Nanjing Tech University)
  • Received : 2023.03.14
  • Accepted : 2024.06.07
  • Published : 2023.12.25
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Abstract

Using industrial wastes and construction and demolition (C&D) wastes is potentially advantageous for concrete production in terms of sustainability improvement. In this paper, a sustainable Self-Compacting Concrete (SCC) made with industrial wastes and C&D wastes was proposed by considerably replacing natural counterparts with recycled coarse aggregates (RCAs) and supplementary cementitious materials (SCMs) (i.e., Fly ash (FA), ground granulated blast furnace slag (GGBS) and silica fume (SF)). A total of 12 SCC mixes with various RCAs and different combination SCMs were prepared, which comprise binary, ternary and quaternary mixes. The mechanical properties in terms of compressive strength and static elasticity modulus of recycled aggregates (RA-SCC) mixes were determined and analyzed. Microstructural study was implemented to analyze the reason of improvement on mechanical properties. By means of life cycle assessment (LCA) method, the environmental impacts of RA-SCC with various RCAs and SCMs were quantified, analyzed and compared in the system boundary of "cradle-to-gate". In addition, the comparison of LCA results with respect to mechanical properties was conducted. The results demonstrate that the addition of proposed combination SCMs leads to significant improvement in mechanical properties of quaternary RA-SCC mixes with FA, GGBS and SF. Furthermore, quaternary RA-SCC mixes emit lowest environmental burdens without compromising mechanical properties. Thus, using the combination of FA, GGBS and SF as cement substitution to manufacture RA-SCC significantly improves the sustainability of SCC by minimizing the depletion of cement and non-renewable natural resources.

Keywords

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