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The construction industry has a significant effect on the sustainability calendar, in terms of greenhouse gas (GHG) emissions, consumption of natural resource, and waste generation. The manufacture of ordinary Portland cement (OPC) is responsible for around 7% of the global CO2 emissions. Geopolymers are often considered as a potential eco-friendly alternative to OPC because of reduced environmental impact. In recent years, research on the use of construction and demolition waste (CDW) precursors to manufacture geopolymers has attracted worldwide interests owing to several significant advantages. It was found that, however, the reactivity of CDW precursors is generally low and the synthesized geopolymers exhibit low strength in most cases, except special curing regime is employed. Adding ground granulated blast furnace slag (GGBS) benefits to improve the performance of CDW-GGBS-based geopolymers. However, the influence of increasing GGBS/CDW ratio on the properties of geopolymers after ambient curing is not yet well understood. In this study, sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) are used as alkaline solutions, and the effect of raising GGBS/CDW ratio from 50/50 towards 80/20 is investigated on setting time, flowability index and compressive strength of the geopolymer composite (with Na2O/b = 8%, SiO2/Na2O = 1.33 and w/b = 0.35). The test results indicate that an increase in GGBS content has a beneficial effect on compressive strength increase and reduction in setting time until a GGBS/CDW ratio of 70/30. The test data helps to gain a better understanding of the fresh and hardened properties of CDW-GGBS-based geopolymers after ambient curing.

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Effect of Increasing Slag Content on the Workability and Mechanical Properties of CDW-GGBS Based Geopolymer Composites

  • 会议论文

  • 发表日期：

    2025年

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  • Jasper Vitse,
  • Dongsheng Zhang,
  • Jiabin Li

摘要

The construction industry has a significant effect on the sustainability calendar, in terms of greenhouse gas (GHG) emissions, consumption of natural resource, and waste generation. The manufacture of ordinary Portland cement (OPC) is responsible for around 7% of the global CO2 emissions. Geopolymers are often considered as a potential eco-friendly alternative to OPC because of reduced environmental impact. In recent years, research on the use of construction and demolition waste (CDW) precursors to manufacture geopolymers has attracted worldwide interests owing to several significant advantages. It was found that, however, the reactivity of CDW precursors is generally low and the synthesized geopolymers exhibit low strength in most cases, except special curing regime is employed. Adding ground granulated blast furnace slag (GGBS) benefits to improve the performance of CDW-GGBS-based geopolymers. However, the influence of increasing GGBS/CDW ratio on the properties of geopolymers after ambient curing is not yet well understood. In this study, sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) are used as alkaline solutions, and the effect of raising GGBS/CDW ratio from 50/50 towards 80/20 is investigated on setting time, flowability index and compressive strength of the geopolymer composite (with Na2O/b = 8%, SiO2/Na2O = 1.33 and w/b = 0.35). The test results indicate that an increase in GGBS content has a beneficial effect on compressive strength increase and reduction in setting time until a GGBS/CDW ratio of 70/30. The test data helps to gain a better understanding of the fresh and hardened properties of CDW-GGBS-based geopolymers after ambient curing.