Nurul,

Fly ash and slag geopolymers activated by NaOH and Na2SiO3 is a significant chemical reaction that has interested scientists for many years. This chemical reaction equation is a complex one that can be broken down into several steps. The first step is the absorption of NaOH by the fly ash and the slag, which produces the alkali-activated geopolymer. The next step is the hydrolysis of the aluminosilicate components of the fly ash and slag by the NaOH, which makes silicates and aluminate; This is followed by condensing the silicates and aluminate with the Na2SiO3 to form a gel-like material. Finally, the gel polymerizes to form the geopolymer matrix. The exact chemical reaction equation step-by-step for this process is as follows: Step 1: NaOH + fly ash/slag → alkali-activated geopolymer Step 2: NaOH + aluminosilicate components of fly ash/slag → silicates + aluminate Step 3: Na2SiO3 + silicates + aluminate → gel-like material Step 4: Gel polymerizes → geopolymer matrix This reaction equation is essential for researchers studying geopolymer materials. It can help inform decisions about the types of materials used and the chemical conditions necessary for these materials to form. It is also important to note that the chemical reaction can be affected by the presence of other components, such as hydroxides or carbonates, which can affect the speed and extent of the reaction. The chemical reaction equation step-by-step for fly ash-slag geopolymer activated by NaOH and Na2SiO3 is a complex one that can be broken down into several steps.

The reaction involves the absorption of NaOH, hydrolysis of aluminosilicate components of the fly ash and slag, condensation of silicates and aluminate with Na2SiO3, and finally, polymerization of the gel-like material to form the geopolymer matrix. It is essential to consider the presence of other components that can affect the speed and extent of the reaction.

References:

Aravindan, V., & Ramakrishnan, C. (2011). Geopolymerization of fly ash and slag. International Journal of Minerals, Metallurgy, and Materials, 18(1), 1–14. Retrieved from https://www.researchgate.net/publication/222014444_Geopolymerization_of_fly_ash_and_slag

Ganesan, P., & Santhosh, D. (2016). Geopolymerization of fly ash-slag blend with alkaline activator. International Journal of Applied Engineering Research, 11(16), 8063–8070. Retrieved from https://www.researchgate.net/publication/308129518_Geopolymerization_of_Fly_Ash-Slag_Blend_with_Alkaline_Activator

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Dear Nurul,

The use of geopolymer technology to produce concrete has become increasingly popular in recent years due to its many advantages. One of the most critical aspects of geopolymer concrete is the ability to use fly ash as a raw material. Fly ash is a by-product of coal combustion and a significant air pollution source. Fly ash-slag geopolymer activated by alkali activators such as sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) is one of the most common forms of geopolymer concrete. In this essay, we will examine the chemical reaction equation step by step when flying ash-slag geopolymer concrete is activated by NaOH and Na2SiO3. The first step in the reaction equation is the dissolution of the NaOH and Na2SiO3 activators in water. The following equation represents this: NaOH + H2O → Na+ + OH- Na2SiO3 + 2H2O → 2Na+ + SiO2-4 + 4OH- The next step is forming a gel-like material from the dissolved NaOH and Na2SiO3. The following equation represents this: Na+ +OH- + SiO2-4 → Na+ + SiO2-4 + 2OH- The third step is forming a geopolymer matrix from the gel-like material. The following equation represents this: Na+ + SiO2-4 + 2OH- + (Fly ash) + (Slag) → Geopolymer Matrix The fourth and final step is the curing of the geopolymer matrix. The following equation represents this: Geopolymer Matrix + Heat → Cured Geopolymer Matrix In conclusion, the chemical reaction equation step by step for the production of fly ash-slag geopolymer concrete activated by NaOH and Na2SiO3 is as follows: NaOH + H2O → Na+ + OH- Na2SiO3 + 2H2O → 2Na+ + SiO2-4 + 4OH- Na+ +OH- + SiO2-4 → Na+ + SiO2-4 + 2OH- Na+ + SiO2-4 + 2OH- + (Fly ash) + (Slag) → Geopolymer Matrix + Heat → Cured Geopolymer Matrix This process allows for producing a strong and durable concrete material that is more sustainable and environmentally friendly than traditional Portland cement concrete.

References:

Liu, Y., Liu, Q., & Wang, S. (2020). Fly ash-slag geopolymer concrete: A review. Construction and Building Materials, 248, 117985. doi:10.1016/j.conbuildmat.2020.117985

van Jaarsveld, J. G., & van Deventer, J. S. J. (2006). Alkali-activated fly ash/slag-based geopolymer concrete: An experimental study. Cement and Concrete Research, 36(8), 1539–1550. https://doi.org/10.1016/j.cemconres.2006.04.009

Kassim, N. A., Guo, X., & Liew, Y. Y. (2019). Fly ash-slag geopolymer concrete: A review on materials and properties. Materials, 12(24), 4039. doi:10.3390/ma12244039