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A platform for research: civil engineering, architecture and urbanism
Strength and Microstructure Development of Fly Ash Geopolymer Binders Using Waste Glass Powder
This study investigated the effect of using waste glass powder (GP) as partial replacement of fly ash on the strength and microstructure development of geopolmer binders. GP was used at different rates varying from 1 to 5% mass of fly ash and 8 molar NaOH solution was used as the activator. Geopolymer paste specimens of 50 mm cube were heat cured at 80 °C for the first 24 h after casting and then left in ambient conditions. The 28-day compressive strength of the fly ash geopolymer without GP was 23 MPa. The inclusion of 2% GP improved the 28-day compressive strength of heat cured fly ash geopolymer by 18%. This is attributed to the increment of soluble silica from the GP. However, compressive strength declined with further increase of GP content beyond 2%. The decline of strength is attributed to the presence of excess unreacted GP particles. X-ray diffraction (XRD) analysis indicated that the presence of higher amount of crystalline Na-type chabazite and zeolite phases for using 2% GP. Scanning electron microscopy (SEM) images showed denser microstructure of geopolymers containing 1–2% GP. The elemental composition of gel formed in these binders consisted of higher percentages of Si, Al and Na, which indicates the formation of higher amount of sodium aluminosilicate gel (N–A–S–H).
Strength and Microstructure Development of Fly Ash Geopolymer Binders Using Waste Glass Powder
This study investigated the effect of using waste glass powder (GP) as partial replacement of fly ash on the strength and microstructure development of geopolmer binders. GP was used at different rates varying from 1 to 5% mass of fly ash and 8 molar NaOH solution was used as the activator. Geopolymer paste specimens of 50 mm cube were heat cured at 80 °C for the first 24 h after casting and then left in ambient conditions. The 28-day compressive strength of the fly ash geopolymer without GP was 23 MPa. The inclusion of 2% GP improved the 28-day compressive strength of heat cured fly ash geopolymer by 18%. This is attributed to the increment of soluble silica from the GP. However, compressive strength declined with further increase of GP content beyond 2%. The decline of strength is attributed to the presence of excess unreacted GP particles. X-ray diffraction (XRD) analysis indicated that the presence of higher amount of crystalline Na-type chabazite and zeolite phases for using 2% GP. Scanning electron microscopy (SEM) images showed denser microstructure of geopolymers containing 1–2% GP. The elemental composition of gel formed in these binders consisted of higher percentages of Si, Al and Na, which indicates the formation of higher amount of sodium aluminosilicate gel (N–A–S–H).
Strength and Microstructure Development of Fly Ash Geopolymer Binders Using Waste Glass Powder
RILEM Bookseries
M.C.F. Cunha, Vítor (editor) / Rezazadeh, Mohammadali (editor) / Gowda, Chandan (editor) / Khan, Md. Nabi Newaz (author) / Kuri, Jhutan Chandra (author) / Sarker, Prabir Kumar (author)
RILEM Spring Convention and Conference ; 2020 ; Guimarães, Portugal
Proceedings of the 3rd RILEM Spring Convention and Conference (RSCC 2020) ; Chapter: 5 ; 43-52
RILEM Bookseries ; 35
2021-07-14
10 pages
Article/Chapter (Book)
Electronic Resource
English
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