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تاثیر زیست محیطی آب دریا بر بتن فعال قلیایی مبتنی بر سرباره کوره آهن گدازی
صفوی، علیرضا Safavi, Alireza
Environmental Impact of Seawater on GGBFS-Based Alkali-Activated Concrete
Safavi, Alireza | 2022
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- Type of Document: M.Sc. Thesis
- Language: English
- Document No: 56615 (53)
- University: Sharif University of Technology, International Campus, Kish Island
- Department: Science and Engineering
- Advisor(s): Toufigh, Vahab
- Abstract:
- This study seeks to compare the effect of curing conditions in the sea, coast, and middle of the island environment on five mix designs of alkali-activated concrete (AAC) based on ground granulated blast furnace slag (GGBFS) and fly ash (FA) and the effect of the ratio of sodium silicate (SS) to sodium hydroxide (SH) and alkali activated solutions (AAMS) to the binder on mechanical properties. The compressive strength and load-deflection test was conducted to obtain uniaxial compressive strengths (UCS), modulus of elasticity ("E" _"S" ), elastic and ultimate strain, and dissipated energy. The most significant decrease in strength was observed in the coastal area and the sea. Also, the results of the samples showed that increasing the ratio of SS and SH from 1.5 to 2.5 increases the "E" _S and UCS up to 64.9 MPa and reduces the ultimate strain from 0.0042 to 0.0036. Also, decreasing the ratio of AAMS to binder from 0.11 to 0.05 increased the ultimate strain and decreased the UCS. Among the reasons for reducing the strength of the samples on the coast is the destructive effect of the wavy area on the concrete surface and the penetration of chloride ions and preventing the formation of C-A-S-H cement gel in the concrete microstructure
- Keywords:
- Slags ; Fly Ash ; Marine Environment ; Microstructure ; Uniaxial Compression Test ; Ground Granulated Glast-Furnace Slag ; Alkali-Activated Concrete ; Elastisity Modulus
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