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August 16, 2026Structural ConcreteOpen Access

Mechanical performance and microstructural degradation of raw coal gangue aggregate concrete under chloride freeze–thaw exposure

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Authors

LSLinghua ShenHSHaowen SunHZHui Zhao

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Overview

Experimental study demonstrates accelerated mechanical and microstructural degradation in coal gangue concrete during salt freeze–thaw cycles, highlighting durability limits in cold regions.

Key Points

  • To investigate the mechanical properties, durability, and microstructural degradation of concrete containing raw coal gangue aggregates subjected to water and salt freeze–thaw cycles.
  • Fabricated concrete mixtures replacing coarse natural aggregates with raw coal gangue aggregates at ratios of 0%, 30%, 70%, and 100%.
  • Evaluated surface deterioration, cubic compressive strength, mass loss, and relative dynamic elastic modulus after water and salt freeze–thaw cycles.
  • Characterized microstructural degradation and pore size distributions using scanning electron microscopy and mercury intrusion porosimetry.
  • Higher raw coal gangue aggregate replacement ratios significantly reduced compressive strength and overall freeze–thaw resistance.
  • After 75 freeze–thaw cycles, concrete with 100% replacement experienced compressive strength losses of 29.79% in water and 54.21% in salt conditions.
  • Salt freeze–thaw conditions accelerated deterioration compared to water exposure, driven by harmful pore expansion and microstructural damage in the interfacial transition zone.

Cite This Study

Shen et al. (2026) studied this question.

synapsesocial.com/papers/6a817a4cf2fb91fc834ae0a0https://doi.org/10.1002/suco.70749
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Research on the effect of aggregate characteristics influencing macro-mechanical degradation and meso-damage evolution in coal gangue concrete with freeze-thaw performance2026
  2. 2Deterioration of Activated Coal Gangue Powder Concrete under Combined Sulfate Attack and Freeze-Thaw Cycles2025 · 1 citations
  3. 3Compressive stress–strain responses of concretes containing raw coal gangue aggregates exposed to elevated temperatures2026
  4. 4Multi-Scale Analysis of the Damage Evolution of Coal Gangue Coarse Aggregate Concrete after Freeze–Thaw Cycle Based on CT Technology2024 · 19 citations
  5. 5Experimental Investigation and Numerical Simulation of Freeze–Thaw Damage Behavior in Coal Gangue Concrete Used in High-Altitude Cold Western Mines2025