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<p>The research is conducted with an objective to ascertain the potential of dolomite as a partial replacement of cement in concrete and its impact on fresh concrete behavior, hardened properties, durability, and, especially, the environmental impact. The concrete mixes containing both dolomite and GGBS (ground granulated blast furnace slag) exhibited increased workability and enhanced cohesiveness. At the end of 28 days of curing, the specimens that had been modified with dolomite and had 15% of dolomite and 35% of GGBS replacement with 50% of cement showed better mechanical performance as they experienced a 14.47% increase in compressive strength, over 15% improvement in split tensile strength, and almost 24% enhancement in flexural strength when compared to the standard mix. The best results occurred at the point of 15% substitution of cement with dolomite, which offered the right combination of strength gain and durability improvement. The testing done for durability showed the optimized mix had the best resistance because of the creation of the shallowest carbonation area and the application of the method of electrochemical impedance spectroscopy (EIS) for measuring the significantly higher electrochemical resistance. The Nyquist and Bode diagrams were used to confirm the improved electrochemical stability of the modified system. The analysis of microstructure showed that the use of dolomite has led to the development of a denser cementitious matrix with a more refined pore structure and better interfacial adhesion, all due to the filler effect of dolomite. The environmental impact of dolomite as a supplementary cementitious material (SCM) was seen in the decrease in the embodied carbon and embodied energy of the dolomite-modified concrete by about 2.5% and 3.5%, respectively, in comparison with the conventional mix. The results presented herein designate dolomite as a very innovative and eco-friendly material that can not only enhance the mechanical and durability properties of concrete but also facilitate the adoption of eco-efficient construction practices.</p> Graphical Abstract <p></p>

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Mechanical and microstructural evaluation of dolomite and GGBS in sustainable concrete

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • B. Narendra Kumar,
  • Prakhash Neelamegam,
  • V. CharanTeja Yadav,
  • Oorkalan Ayyanar

摘要

The research is conducted with an objective to ascertain the potential of dolomite as a partial replacement of cement in concrete and its impact on fresh concrete behavior, hardened properties, durability, and, especially, the environmental impact. The concrete mixes containing both dolomite and GGBS (ground granulated blast furnace slag) exhibited increased workability and enhanced cohesiveness. At the end of 28 days of curing, the specimens that had been modified with dolomite and had 15% of dolomite and 35% of GGBS replacement with 50% of cement showed better mechanical performance as they experienced a 14.47% increase in compressive strength, over 15% improvement in split tensile strength, and almost 24% enhancement in flexural strength when compared to the standard mix. The best results occurred at the point of 15% substitution of cement with dolomite, which offered the right combination of strength gain and durability improvement. The testing done for durability showed the optimized mix had the best resistance because of the creation of the shallowest carbonation area and the application of the method of electrochemical impedance spectroscopy (EIS) for measuring the significantly higher electrochemical resistance. The Nyquist and Bode diagrams were used to confirm the improved electrochemical stability of the modified system. The analysis of microstructure showed that the use of dolomite has led to the development of a denser cementitious matrix with a more refined pore structure and better interfacial adhesion, all due to the filler effect of dolomite. The environmental impact of dolomite as a supplementary cementitious material (SCM) was seen in the decrease in the embodied carbon and embodied energy of the dolomite-modified concrete by about 2.5% and 3.5%, respectively, in comparison with the conventional mix. The results presented herein designate dolomite as a very innovative and eco-friendly material that can not only enhance the mechanical and durability properties of concrete but also facilitate the adoption of eco-efficient construction practices.

Graphical Abstract