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Utilizing Tunnel Boring Machine (TBM)-Crushed Limestone as a Construction Material.

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Tunnel boring machine (TBM) crushed rock powder can be repurposed as a sustainable construction material for pavement subgrades and sub-bases. Optimal use involves on-site sieving and blending with granular materials.

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Area of Science:

  • Geotechnical Engineering
  • Sustainable Construction Materials
  • Waste Valorization

Background:

  • Tunnel boring machine (TBM) excavations generate substantial quantities of crushed rock powder, often treated as waste.
  • Conventional construction relies heavily on virgin crushed aggregates for pavement layers, increasing resource depletion.

Purpose of the Study:

  • To assess the viability of using TBM-crushed materials mixed with granular components in pavement construction.
  • To reduce construction waste and the demand for quarried aggregates.

Main Methods:

  • Dynamic and static strength tests were performed, including modulus of resilience and California bearing ratio (CBR).
  • Investigated the influence of blending ratios between 3/8-inch aggregate (G1) and material passing sieve number 4 (P4).
  • Stability and durability tests were conducted on various TBM-crushed material mixtures.

Main Results:

  • TBM-crushed material, when sorted and screened, demonstrated suitability for subgrade and sub-base applications.
  • Blending 5-10% of 3/8-inch aggregate with TBM-crushed limestone fine powder optimized material quality.
  • Strength tests confirmed the potential of TBM materials in pavement construction.

Conclusions:

  • TBM-crushed materials can be effectively utilized as a sustainable alternative to traditional aggregates in pavement engineering.
  • On-site processing and optimized blending ratios are key to maximizing the performance of TBM-derived construction materials.
  • This approach contributes to environmental sustainability by valorizing excavation waste.