Kapak Resmi

Mechanical Behavior of Fly-Ash Geopolymer Under Stray-Current and Soft-Water Coupling

Kaydedildi:
Yayımlandı:Buildings vol. 15, no. 14 (2025), p. 2514-2531
Yazar: Tang, Ran
Diğer Yazarlar: Liu, Fang, Wang, Baoming, Wang, Xiaojun, Cheng, Hua, Yuan Xiaosa
Baskı/Yayın Bilgisi:
MDPI AG
Konular:
China
Curing
Mechanical properties
Subways
Erosion resistance
Concrete structures
Water
Stray current
Corrosion
Fly ash
Buried structures
Corrosion rate
Corrosion resistance
Hydration
Energy consumption
Caustic soda
Test methods
High temperature
Reinforced concrete
Concrete mixing
Raw materials
Infrastructure
Sustainable development
Sodium
Leaching
Carbon
Geopolymers
Harsh environments
Sodium silicates
Silica
Particle size
Cement
Compressive strength
Buried pipes
Online Erişim:Citation/Abstract
Full Text + Graphics
Full Text - PDF
Etiketler: Etiketle
Etiket eklenmemiş, İlk siz ekleyin!
Özet: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.
ISSN:2075-5309
DOI:10.3390/buildings15142514
Kaynak:Engineering Database