Investigation on Mechanical and Durability Properties of Geopolymer Concrete with Ground Granulated Blast Furnace Slag Incorporating Sugarcane Bagasse Ash
- Title
- Investigation on Mechanical and Durability Properties of Geopolymer Concrete with Ground Granulated Blast Furnace Slag Incorporating Sugarcane Bagasse Ash
- Creator
- Tanu, H M
- Contributor
- Sujatha, Unnikrishnan
- Description
- This study deals with strength, durability, elevated temperature behaviour, cost, energy and carbon efficiency of sustainable GPC developed with GGBS and SCBA. Sodium hydroxide (NaOH) of 8M, 10M, and 12M and sodium silicate (Na2SiO3) were used as alkaline activators with sodium silicate to sodium hydroxide ratio being 2.5. Fifteen different binary blend GPC mixtures were prepared by varying SCBA content (0%, 5%, 10%, 15% and 20% by mass of precursor) and also by varying molarity of NaOH by 8M, 10M and 12M. The developed GPC's fresh, hardened, microstructural, and correlation characteristics have all been assessed. Various tests such as the slump cone test, Cs, Sts, Fs, and UPV test were conducted. SEM, Edax, and XRD analysis were examined for understanding the microstructural characteristics. For a target strength of 40 MPa, the GPC produced with 20% SCBA and 80% GGBS with an 8M NaOH solution and an SS/SH ratio of 2.5 can be utilized. The reason for the development of higher strength in higher molarity of GGBS-SCBA based GPC specimens is clearly shown by SEM micrographs, which indicate a dense and packed matrix. The presence of CASH gel confirmed this in the GP matrix. Durability studies such as rapid chloride permeability, sorptivity and early and long-term effect of sulphate attack were conducted on GGBS-SCBA based GPC. Also elevated temperature behaviour of GPC specimen subjected to different temperatures of 200?C, 400?C, 600?C and 800?C were studied to evaluate the strength, mass loss and effect on microstructures due to elevated temperature. The degradation of geopolymer concrete at different elevated temperatures was observed by SEM, Edax, XRD and FTIR. From the test findings it is noticed that the GPC developed have good durability characteristics. It is also noticed that geopolymer concrete retains more than 50% of strength up to a temperature of 600 ?C. From scanning electron microscope analysis of GPC developed with GGBS and SCBA, it is found that there are larger crack formations and pores which are visible in the geopolymer concrete matrix when the specimens are exposed to an elevated temperature of 800?C which confirms the degradation of C-A-S-H gel in the GPC mixtures developed. Additionally, incorporation of sugarcane bagasse ash in GPC will reduce disposal problems and also carbon dioxide emission.
- Source
- Author's Submission
- Date
- 2024-01-01
- Publisher
- Christ(Deemed to be University)
- Subject
- Civil Engineering
- Rights
- Open Access
- Relation
- 61000352
- Format
- Language
- English
- Type
- PhD
- Identifier
- http://hdl.handle.net/10603/577515
Collection
Citation
Tanu, H M, “Investigation on Mechanical and Durability Properties of Geopolymer Concrete with Ground Granulated Blast Furnace Slag Incorporating Sugarcane Bagasse Ash,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 23, 2025, https://archives.christuniversity.in/items/show/12398.