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<p>This study investigates the use of carbon black to create conductive pathways in cement pastes while examining the associated environmental implications. Two carbon blacks, furnace black (FB) and acetylene black (AB), were experimentally investigated in cement pastes with different carbon black contents, water-to-cement ratios, and superplasticizer dosages. In parallel, the environmental analysis considered the production of the carbon black and the corresponding paste formulations. The results show that carbon black significantly improves the electrical conductivity of cement pastes once the percolation threshold is exceeded, generally around 2 wt%, with conductivity values above 1 S/m typically reached from about 3 to 4 wt% carbon black. AB appeared more effective than FB under the tested conditions. At the paste scale, the environmental comparison was limited to the GWP indicator, and the differences between AB- and FB-based formulations remained much smaller than those observed at the raw material scale, while cement remained the dominant contributor to GWP. To relate electrical functionality to climate change impact, a Performance Impact Indicator (<i>PII</i>) was introduced as the ratio between GWP and electrical conductivity. The results showed that higher carbon black contents led to lower PII values, indicating a more favorable conductivity-to-GWP ratio under the conditions investigated. In addition, two alternative carbon black production routes were examined from an environmental perspective only: HB associated with hydrogen co-production and TB based on waste tyre pyrolysis. These additional scenarios suggest that lower-impact carbon black supply routes may deserve further consideration for conductive cement-based applications.</p>

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Carbon black from multiple production routes in conductive cement pastes: balancing multifunctional performance and environmental burden

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • Rachida Idir,
  • Seckou Fossar Souane,
  • Faïrouz Touati,
  • Katerina Ioannidou,
  • Gwenn Le Saout

摘要

This study investigates the use of carbon black to create conductive pathways in cement pastes while examining the associated environmental implications. Two carbon blacks, furnace black (FB) and acetylene black (AB), were experimentally investigated in cement pastes with different carbon black contents, water-to-cement ratios, and superplasticizer dosages. In parallel, the environmental analysis considered the production of the carbon black and the corresponding paste formulations. The results show that carbon black significantly improves the electrical conductivity of cement pastes once the percolation threshold is exceeded, generally around 2 wt%, with conductivity values above 1 S/m typically reached from about 3 to 4 wt% carbon black. AB appeared more effective than FB under the tested conditions. At the paste scale, the environmental comparison was limited to the GWP indicator, and the differences between AB- and FB-based formulations remained much smaller than those observed at the raw material scale, while cement remained the dominant contributor to GWP. To relate electrical functionality to climate change impact, a Performance Impact Indicator (PII) was introduced as the ratio between GWP and electrical conductivity. The results showed that higher carbon black contents led to lower PII values, indicating a more favorable conductivity-to-GWP ratio under the conditions investigated. In addition, two alternative carbon black production routes were examined from an environmental perspective only: HB associated with hydrogen co-production and TB based on waste tyre pyrolysis. These additional scenarios suggest that lower-impact carbon black supply routes may deserve further consideration for conductive cement-based applications.