Effects of Seawater Content in Alkaline Activators to Engineering Properties of Fly Ash-Based Geopolymer Concrete

Minh, Quang Tran; Bui, Thu Ha; Nguyen, Hoc Thang

doi:10.4028/www.scientific.net/ssp.296.105

Cited by 23 publications

(14 citation statements)

References 17 publications

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“…Moreover, the geopolymer-based materials are also applied as refractory, heat resistant, heat absorbent materials that can be used to prevent fire for buildings made of reinforced concrete such as building tunnels. Recently, the geopolymer materials are also used to store radioactive and toxic substances [1,[16][17][18][21][22][23].…”

Section: Fig 1: Applied Fields Of Geopolymer-based Materials Proposed By Geopolymer Institutementioning

confidence: 99%

Characteristics of Novel Geopolymer Composites Synthesized from Red Mud and Diatomaceous Earth in Autoclave Conditions without Using Alkaline Activators

Minh

Nguyen

2020

JoPC

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The geopolymer-based materials have been studied and developed since the last decades of the 20th century and applied in many fields of life. The production of geopolymer also has many different levels of technology from low to high technology which depends on quality and the applied fields of products. The geopolymer composites are also considered as environmentally friendly products related to low energy consumption production technology; reuse industrial wastes as raw materials; low or even zero CO2 emission; many better properties compared to the same traditional materials, and others. This investigation would like to introduce a novel type of geopolymer-based materials synthesized from red mud and diatomaceous earth in autoclave conditions without using alkaline activators. The geopolymer composites were fabricated in three various temperatures of 120, 150, and 200 o C and evaluated characteristics via different analytical methods. The method of X-ray diffraction (XRD) was used to evaluate phase transitions among raw materials (RM and DE) and the geopolymer composite materials. Characteristics of bondings in the materials were detected by using Fourier transform infrared spectroscopy (FTIR). The differential thermal analysis-thermogravimetric analysis (DTA-TG) is method used to look for the physico-chemical changes of the geopolymer composite materials exposed at high temperature. In addition, the geopolymer based materials were observed for morphologies and microstructures in its solid phase lattice matrix using scanning electron microscope (SEM).

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Section: Fig 1: Applied Fields Of Geopolymer-based Materials Proposed By Geopolymer Institutementioning

confidence: 99%

Characteristics of Novel Geopolymer Composites Synthesized from Red Mud and Diatomaceous Earth in Autoclave Conditions without Using Alkaline Activators

Minh

Nguyen

2020

JoPC

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“…The sodium and potassium silicates are produced from calcination of carbonate salts and silica and then dissolved in water with the desired ratios. This process also consumes the energy and emitted CO2 but total energy consumption and CO2 emission are much lower than Portland cement production [5,[26][27][28].…”

Section: Effects Of Alkaline Activators To Geopolymerization Reactionsmentioning

confidence: 99%

Geopolymerization: A Review on Physico-chemical Factors Influence to the Reaction Process

Thang

2020

JoPC

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A geopolymer is one of materials belonging to an inorganic polymer group based on aluminosilicate structural networks. The material is a product of reactions among the activated alumino-silicate resources and solutions of alkaline activators in various conditions. There have been many investigations conducted to produce geopolymer using different raw materials and methods. The chemical factors have a decisive role in the reaction process and the formation of the geopolymeric structural networks. The physical factors significantly influenceon engineering properties, microstructural characteristicsas well as the effectiveness of the reactions. This study is a review on evaluation of relationships among physico-chemical factors in the reaction process. In which, the chemical factors were considered both the alumino-silicate raw materials and alkaline activators. The physical factors were evaluated on the various conditions known as mixing time, curing time and curing temperature.

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“…In this study, the seawater with abundant available resources in coastal areas used as NaOH substitution in the manufacture of Geopolymer. Seawater is expected to replace the need for NaOH in the activator because seawater has alkaline ions which are useful in helping the reactions that occur in Geopolymer (Do, Q., et al, 2019). With the discovery of an appropriate substituent material, it is hoped that coastal communities will have a positive impact on being able to use this technology to start small and medium-sized businesses producing Geopolymer-based bricks.…”

Section: Introductionmentioning

confidence: 99%

Seawater as Alkali Activator in Fly Ash Based Geopolymer

Harmaji

2022

EMACS Journal

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Indonesia as a maritime country in the world with 66% of its territory consists of maritime territory. A lot of potential that can be exploited, such as sea water. XRD characterization results indicate that the sea water from Tanjung Priok, North Jakarta, Indonesia has a compound Halite (NaCl) and Bassanite (CaSO4.5H2O) in the salt form. These compounds are alkaline thereby can influence the compressive strength of the geopolymer. Geopolymer is made up of aluminosilicate precursors which are activated by the alkaline activator solution, which usually combines sodium silicate and sodium hydroxide. The precursor material is waste from the coal based power plant called fly ash that produce 219.000 tonne per year and still underutilized but potentially as an alternative to cement. In this study, seawater was used to substitute the sodium hydroxide in alkali activator as an effort to reduce the manufacturing cost of Geopolymer. Geopolymer prepared by mixing fly ash as a precursor, silica sand as aggregates, with activator, then casted and cured by immersion. After 28 days compression test was conducted to measure the strength of resulting geopolymer. The sample consisted of a mixture of fly ash, silica sand, waterglass, and seawater produces strength of 16.60 MPa. X-Ray Diffraction characterization was conducted to study the compound formed from precursors activated with seawater alkali activator. Resulting diffractogram indicate the formation of anorthite compound as proof of Geopolymerization has been successfully occured.

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Effects of Seawater Content in Alkaline Activators to Engineering Properties of Fly Ash-Based Geopolymer Concrete

Cited by 23 publications

References 17 publications

Characteristics of Novel Geopolymer Composites Synthesized from Red Mud and Diatomaceous Earth in Autoclave Conditions without Using Alkaline Activators

Characteristics of Novel Geopolymer Composites Synthesized from Red Mud and Diatomaceous Earth in Autoclave Conditions without Using Alkaline Activators

Geopolymerization: A Review on Physico-chemical Factors Influence to the Reaction Process

Seawater as Alkali Activator in Fly Ash Based Geopolymer

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