scholarly journals The Effects of Various Concentrations of NaOH on the Inter-Particle Gelation of a Fly Ash Geopolymer Aggregate

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1111
Author(s):  
Alida Abdullah ◽  
Kamarudin Hussin ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Zarina Yahya ◽  
Wojciech Sochacki ◽  
...  
Keyword(s):  
Fly Ash ◽  
Natural Resources ◽  
Sodium Hydroxide ◽  
Microstructural Properties ◽  
Particle Volume ◽  
Synthesis Parameters ◽  
Natural Aggregates ◽  
Mechanical And Microstructural Properties ◽  
The Impact ◽  
Aggregate Impact Value

Aggregates can be categorized into natural and artificial aggregates. Preserving natural resources is crucial to ensuring the constant supply of natural aggregates. In order to preserve these natural resources, the production of artificial aggregates is beginning to gain the attention of researchers worldwide. One of the methods involves using geopolymer technology. On this basis, this current research focuses on the inter-particle effect on the properties of fly ash geopolymer aggregates with different molarities of sodium hydroxide (NaOH). The effects of synthesis parameters (6, 8, 10, 12, and 14 M) on the mechanical and microstructural properties of the fly ash geopolymer aggregate were studied. The fly ash geopolymer aggregate was palletized manually by using a hand to form a sphere-shaped aggregate where the ratio of NaOH/Na2SiO3 used was constant at 2.5. The results indicated that the NaOH molarity has a significant effect on the impact strength of a fly ash geopolymer aggregate. The highest aggregate impact value (AIV) was obtained for samples with 6 M NaOH molarity (26.95%), indicating the lowest strength among other molarities studied and the lowest density of 2150 kg/m3. The low concentration of sodium hydroxide in the alkali activator solution resulted in the dissolution of fly ash being limited; thus, the inter-particle volume cannot be fully filled by the precipitated gels.

scholarly journals Mechanical and microstructural properties of high calcium fly ash one-part geopolymer cement made with granular activator

Heliyon ◽  
2019 ◽  
Vol 5 (9) ◽  
pp. e02255 ◽  
Author(s):  
Bashar S. Mohammed ◽  
Sani Haruna ◽  
M.M.A. Wahab ◽  
M.S. Liew ◽  
Abdulrahman Haruna
Keyword(s):  
Fly Ash ◽  
Microstructural Properties ◽  
High Calcium ◽  
High Calcium Fly Ash ◽  
Geopolymer Cement ◽  
Mechanical And Microstructural Properties

Physical–mechanical and microstructural properties of alkali-activated fly ash–blast furnace slag blends

2015 ◽  
Vol 41 (1) ◽  
pp. 1421-1435 ◽  
Author(s):  
N. Marjanović ◽  
M. Komljenović ◽  
Z. Baščarević ◽  
V. Nikolić ◽  
R. Petrović
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Microstructural Properties ◽  
Mechanical And Microstructural Properties ◽  
Furnace Slag ◽  
Alkali Activated

Multiscale laboratory investigation of the mechanical and microstructural properties of dredged sediments stabilized with cement and fly ash

2020 ◽  
Vol 267 ◽  
pp. 105491 ◽  
Author(s):  
Naphol Yoobanpot ◽  
Pitthaya Jamsawang ◽  
Hatairat Poorahong ◽  
Pornkasem Jongpradist ◽  
Suched Likitlersuang
Keyword(s):  
Fly Ash ◽  
Laboratory Investigation ◽  
Microstructural Properties ◽  
Dredged Sediments ◽  
Mechanical And Microstructural Properties

scholarly journals Comparison of the influence of silica-rich supplementary cementitious materials on cement mortar composites: Mechanical and microstructural assessment

2021 ◽  
Author(s):  
Ozer Sevim ◽  
Cagrı Goktug Sengul
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Cement Mortar ◽  
Bottom Ash ◽  
Cementitious Materials ◽  
Maximum Strength ◽  
Supplementary Cementitious Materials ◽  
Microstructural Properties ◽  
Cement Production ◽  
Mechanical And Microstructural Properties

Abstract The silica-rich supplementary cementitious materials (SCMs) are the key components of mechanical and microstructural properties. The use of SCMs results in improving the mechanical and microstructural properties and decreasing the environmental burden caused by cement production. In this regard, this paper reports a study to compare the influence of silica-rich supplementary cementitious materials (slag, fly ash, and bottom ash) having similar Blaine fineness on cement mortar composites in terms of mechanical and microstructural properties. First, supplementary cementitious materials (slag, fly ash, and bottom ash) were ground at similar cement Blaine fineness (~ 3300 cm2/g) and then by replacing 5% and 20% with cement, the 7-, 28-, 90-day mechanical and microstructural properties of cement mortar composites incorporating SCMs were examined. As a result, it was observed that the compressive strength and microstructural properties of cement mortar composites incorporating slag gave maximum strength and microstructural properties according to samples with fly ash and bottom ash having similar fineness and this will decrease the required amount of cement for the target properties by using slag, thus the number of CO2 emitted to nature will also decrease.

scholarly journals Design of Rigid Pavement by Self Cured Concrete Utilizing Coarse Fly Ash Aggregates and Curing Admixture

2021 ◽  
Vol 889 (1) ◽  
pp. 012011
Author(s):  
Ajay Rana ◽  
Abhishek Sharma ◽  
Kshitij Jassal
Keyword(s):  
Fly Ash ◽  
Flexural Strength ◽  
Power Plants ◽  
Thermal Power ◽  
Waste Product ◽  
Partial Replacement ◽  
Rigid Pavement ◽  
Natural Aggregates ◽  
The Impact ◽  
Ash Aggregates

Abstract In concrete industry, a huge amount of natural aggregates is used in the making of concrete every day. The environment is being exploited by mining for the gain of natural aggregates, resulting in an environmental instability in nature. As a result, an alternate source to substitute natural aggregates in concrete is required. A lot of waste materials have gain attention now a days into the concrete industry as a substitute to natural materials. Fly ash, a waste product of thermal power plants, meets the criterion for being utilised as an aggregate substitute in concrete because of its pozzolanic activity. Coarse fly ash is manufactured using a good manufacturing method and is light in weight. Keeping this into view, the impact of partial replacement of natural coarse aggregates with coarse fly ash aggregates produced using the colds bonded method is explored in this paper. The major focus of this study is on testing for flexural strength of self-cured concrete, as flexural strength is a key criterion for rigid pavement design. In this study, coarse fly ash aggregates are utilised in concrete in different proportions to substitute natural aggregates, and the optimal value for flexural strength is determined using a curing additive. The findings of this experiment indicated that when fly ash aggregates and curing additives were used optimally, the flexure strength improved, which is enough for the construction of rigid pavement as criteria fixed by Indian Standards.

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