Effect of Sodium Hydroxide Concentration and Sodium Silicate to Sodium Hydroxide Ratio on Properties of Calcined Kaolin-White Portlandcement Geopolymer

Pangdaeng, Saengsuree

doi:10.21660/2018.46.mat40

Cited by 10 publications

(4 citation statements)

References 21 publications

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“…The unnecessary OH − ions in the geopolymer cause early precipitation of aluminosilicate gel. These will disturb the process of releasing the Al 3+ and Si 4+ ions in the fly ash and dolomite and cause the geopolymerization rate to be lowered as well, producing a low compressive strength of geopolymer [ 16 ]. This was also due to the high Ca content in dolomite which affects the gelation of silica (Si) during geopolymerization process and distracts the compressive strength output [ 17 ].…”

Section: Resultsmentioning

confidence: 99%

Chemical Distributions of Different Sodium Hydroxide Molarities on Fly Ash/Dolomite-Based Geopolymer

et al. 2022

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Geopolymers are an inorganic material in an alkaline environment that is synthesized with alumina–silica gel. The structure of geopolymers consists of an inorganic chain of material and a covalent-bound molecular system. Currently, Ordinary Portland Cement (OPC) has caused carbon dioxide (CO2) emissions which causes greenhouse effects. This analysis investigates the impact on fly ash/dolomite-based-geopolymer with various molarities of sodium hydroxide solutions which are 6 M, 8 M, 10 M, 12 M and 14 M. The samples of fly ash/dolomite-based-geopolymer were prepared with the usage of solid to liquid of 2.0, by mass and alkaline activator ratio of 2.5, by mass. After that, the geopolymer was cast in 50 × 50 × 50 mm molds before testing after 7 days of curing. The samples were tested on compressive strength, density, water absorption, morphology, elemental distributions and phase analysis. From the results, the usage of 8 M of NaOH gave the optimum properties for the fly ash/dolomite-based geopolymer. The elemental distribution analysis exposes the Al, Si, Ca, Fe and Mg chemical distribution of the samples from the selected area. The distribution of the elements is related to the compressive strength and compared with the chemical composition of the fly ash and dolomite.

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Section: Resultsmentioning

confidence: 99%

Chemical Distributions of Different Sodium Hydroxide Molarities on Fly Ash/Dolomite-Based Geopolymer

et al. 2022

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“…The increase in SS can also contribute to the formation of geopolymer chain monomers, namely Si-O monomer bonds [26]. A steady rise in SS speeds up the formation of polymerization bonds [2], while a steady rise in SS/SH decreases the time it takes for the geopolymer binder to stick together [27]. Setting Time (min)…”

Section: Ratio Of Precursor To Activatormentioning

confidence: 99%

Setting time of coconut fiber ash-based geopolymer binder

Widnyana

Salain

Sutarja

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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This watchfulness goal is to decide the beginning and ending binding of geopolymer binders using coconut fiber ash (CFA). Experiments were carried out by comparing the effects of ratio precursors and base activators on geopolymer binders. The precursor material is derived from CFA, which consists of 8.24% silicon dioxide, 2.3% diphosphate pentaoxide, 70.6% potassium oxide, 2.25% iron dioxide, and 14.1% chlorine. Using two types of alkaline activators, namely NaOH (SH) with a molar concentration of 14M and Na2SiO3 (SS), which is used as a solution in the manufacturing process. A comparison of the precursor and alkaline activator mixtures with three variations, namely 70%:30%, 75%:25%, and 80%:20%, with SS/SH 1:1, 1.5, and 2:1 ratio by weight. The specimens are cast in a vicat ring with the top and bottom diameters ∅60mm and ∅70mm, as well as a height of 40mm. The setting time test standard used is SNI 2049:2015. The results showed that the beginning and ending binding times of the geopolymer binder got shorter as the P/A and SS/SH got higher, with times 5%–20% decreased on average.

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“…The development of geopolymers began with the production of kaolin-based geopolymers [14]. Geopolymers composed of alumino-silicates (SiO2 and Al2O3) derived from natural resources such as kaolin and fly ash waste, as well as other silica and alumina-containing minerals [15][16][17]. Geopolymers offer the benefits of being fire resistant, chemically corrosion resistant, and having high mechanical strength and durability [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

The Potential of Bemban Fiber as Raw Material of Geopolymer

Haryanti

2023

GEOMATE

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This study focuses on modifying Bemban fiber (Donax Canniformis) and assess its physical and mechanical properties as a material for concrete geopolymers. Bemban was cleaned and chopped into 20 cm pieces before being boiled for 60 minutes and dried at 75°C for 4 hours. Furthermore, the fiber was alkalized for 2 hours in a 3% NaOH solution. Three main aspects were investigated such as water content, cellulose content and the tensile strength of Bemban fiber. Moreover, the water absorption, porosity and compressive strength of mortar geopolymer using modified Bemban fiber were conducted in this research. The result research showed that the water content value of the Bemban fiber was 4% and met the requirements by SNI 06-3730-1995. Moreover, alkalization increased the cellulose content by 44.58% while decreasing the lignin content by 49.18% as well as shrinking the Bemban fiber diameter by 42%. The tensile strength of the Bemban fiber increases by 84.59%, and the fiber shape changes significantly. Carbon (C) and oxygen (O) are the most abundant elements in Bemban fiber. Using modified Bemban fiber in mortar geopolymers can reduce water absorption and porosity, especially the decrease in water absorption and porosity, together with the increased usage of Bemban fiber. Adding 1.5% modified Bemban fiber results in the lowest water absorption capacity and porosity, with physical parameters of 7.18% water absorption, 15.09% porosity, and the highest value of compressive strength is 5.93 MPa.

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Effect of Sodium Hydroxide Concentration and Sodium Silicate to Sodium Hydroxide Ratio on Properties of Calcined Kaolin-White Portlandcement Geopolymer

Cited by 10 publications

References 21 publications

Chemical Distributions of Different Sodium Hydroxide Molarities on Fly Ash/Dolomite-Based Geopolymer

Chemical Distributions of Different Sodium Hydroxide Molarities on Fly Ash/Dolomite-Based Geopolymer

Setting time of coconut fiber ash-based geopolymer binder

The Potential of Bemban Fiber as Raw Material of Geopolymer

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