Mechanical Behavior of Fly-Ash Geopolymer Under Stray-Current and Soft-Water Coupling
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| Publicado en: | Buildings vol. 15, no. 14 (2025), p. 2514-2531 |
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MDPI AG
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| Acceso en línea: | Citation/Abstract Full Text + Graphics Full Text - PDF |
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| 022 | |a 2075-5309 | ||
| 024 | 7 | |a 10.3390/buildings15142514 |2 doi | |
| 035 | |a 3233114255 | ||
| 045 | 2 | |b d20250715 |b d20250731 | |
| 084 | |a 231437 |2 nlm | ||
| 100 | 1 | |a Tang, Ran |u Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi’an 710123, China; tangran627@163.com (R.T.); yuanxiaosa2009@163.com (X.Y.) | |
| 245 | 1 | |a Mechanical Behavior of Fly-Ash Geopolymer Under Stray-Current and Soft-Water Coupling | |
| 260 | |b MDPI AG |c 2025 | ||
| 513 | |a Journal Article | ||
| 520 | 3 | |a Stray-current and soft-water leaching can induce severe corrosion in reinforced concrete structures and buried metal pipelines within subway environments. The effects of water-to-binder ratio (W/C), modulus of sodium silicate (Ms), and alkali content (AC) on the mechanical properties of fly-ash-based geopolymer (FAG) at various curing ages were investigated. The influence of curing temperature and high-temperature curing duration on the development of mechanical performance were examined, and the optimal curing regime was determined. Furthermore, based on the mix design of FAG resistant to coupled erosion from stray-current and soft-water, the effects of stray-current intensity and erosion duration on the coupled erosion behavior were analyzed. The results indicated that FAG exhibited slow strength development under ambient conditions. However, thermal curing at 80 °C for 24 h markedly improved early-age strength. The compressive strength of FAG exhibited an increase followed by a decrease with increasing W/B, Ms, and AC, with optimal ranges identified as 0.28–0.34, 1.0–1.6, and 4–7%, respectively. Soft-water alone caused limited leaching, while the presence of stray-current significantly accelerated degradation, with corrosion rates increasing by 4.1 and 7.2 times under 20 V and 40 V, respectively. The coupled corrosion effect was found to weaken over time and with increasing current intensity. Under coupled leaching conditions, compressive strength loss of FAG was primarily influenced by AC, with lesser contributions from W/B and Ms. The optimal mix proportion for corrosion resistance was determined to be W/B of 0.30, Ms of 1.2, and AC of 6%, under which the compressive strength after corrosion achieved the highest value, thereby significantly improving the durability of FAG in harsh environments such as stray-current zones in subways. | |
| 651 | 4 | |a China | |
| 653 | |a Curing | ||
| 653 | |a Mechanical properties | ||
| 653 | |a Subways | ||
| 653 | |a Erosion resistance | ||
| 653 | |a Concrete structures | ||
| 653 | |a Water | ||
| 653 | |a Stray current | ||
| 653 | |a Corrosion | ||
| 653 | |a Fly ash | ||
| 653 | |a Buried structures | ||
| 653 | |a Corrosion rate | ||
| 653 | |a Corrosion resistance | ||
| 653 | |a Hydration | ||
| 653 | |a Energy consumption | ||
| 653 | |a Caustic soda | ||
| 653 | |a Test methods | ||
| 653 | |a High temperature | ||
| 653 | |a Reinforced concrete | ||
| 653 | |a Concrete mixing | ||
| 653 | |a Raw materials | ||
| 653 | |a Infrastructure | ||
| 653 | |a Sustainable development | ||
| 653 | |a Sodium | ||
| 653 | |a Leaching | ||
| 653 | |a Carbon | ||
| 653 | |a Geopolymers | ||
| 653 | |a Harsh environments | ||
| 653 | |a Sodium silicates | ||
| 653 | |a Silica | ||
| 653 | |a Particle size | ||
| 653 | |a Cement | ||
| 653 | |a Compressive strength | ||
| 653 | |a Buried pipes | ||
| 700 | 1 | |a Liu, Fang |u Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi’an 710123, China; tangran627@163.com (R.T.); yuanxiaosa2009@163.com (X.Y.) | |
| 700 | 1 | |a Wang, Baoming |u School of Civil Engineering, Dalian University of Technology, Dalian 116023, China; wangxj1775@163.com | |
| 700 | 1 | |a Wang, Xiaojun |u School of Civil Engineering, Dalian University of Technology, Dalian 116023, China; wangxj1775@163.com | |
| 700 | 1 | |a Cheng, Hua |u College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China; huacheng19970609@163.com | |
| 700 | 1 | |a Yuan Xiaosa |u Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi’an 710123, China; tangran627@163.com (R.T.); yuanxiaosa2009@163.com (X.Y.) | |
| 773 | 0 | |t Buildings |g vol. 15, no. 14 (2025), p. 2514-2531 | |
| 786 | 0 | |d ProQuest |t Engineering Database | |
| 856 | 4 | 1 | |3 Citation/Abstract |u https://www.proquest.com/docview/3233114255/abstract/embedded/7BTGNMKEMPT1V9Z2?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text + Graphics |u https://www.proquest.com/docview/3233114255/fulltextwithgraphics/embedded/7BTGNMKEMPT1V9Z2?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text - PDF |u https://www.proquest.com/docview/3233114255/fulltextPDF/embedded/7BTGNMKEMPT1V9Z2?source=fedsrch |