Use of Vietnamese rice husk ash for the production of sodium silicate as the activator for alkali-activated binders

This paper investigates the replacement of metakaolin (MK) with rice husk ash (RHA) in the production of alkali-activated binders or geopolymers. The influence of the RHA addition on compressive and flexural strength, as well as water absorption and apparent porosity were determined, in terms of the percentage of RHA in the mixture and molar ratios of the mixes. Fourier Transform Infrared (FTIR) spectroscopy and Energy Dispersive spectroscopy (EDS) were carried out to assess the changes in the microstructure of the geopolymer matrices with the RHA addition. Results have shown that RHA may be a supplementary precursor for geopolymers. The composition of the geopolymer matrices containing 0-40% RHA is very similar, which indicates that the additional Si provided by RHA is not incorporated to the geopolymer matrix. In addition, geopolymers with RHA content higher than 40% present a plastic behavior, characterized by extremely low strength and high deformation, which can be attributed to the formation of silica gel in formulations containing variable Si/Al ratio.

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Investigation of the reaction mechanism of blended fly ash and rice husk ash alkali-activated binders

Archives of Civil and Mechanical Engineering ◽

10.1007/s43452-021-00349-6 ◽

2021 ◽

Vol 22 (1) ◽

Author(s):

Sarah Fernando ◽

Chamila Gunasekara ◽

David W. Law ◽

M. C. M. Nasvi ◽

Sujeeva Setunge ◽

...

Keyword(s):

Reaction Mechanism ◽

Fly Ash ◽

Rice Husk ◽

Rice Husk Ash ◽

Alkali Activated Binders ◽

Alkali Activated

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A Study on a Green Route to Preparation of Silica Powders with Rice Husk Ash

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1010-1012.1015 ◽

2014 ◽

Vol 1010-1012 ◽

pp. 1015-1019

Author(s):

Ze Xin Yang ◽

Lin Dong ◽

Meng Wang ◽

Huan Li

Keyword(s):

Sodium Bicarbonate ◽

Sodium Silicate ◽

Rice Husk ◽

Rice Husk Ash ◽

Sodium Hydroxide Solution ◽

Sodium Silicate Solution ◽

Silicate Solution ◽

Raw Material ◽

Transmission Electron ◽

Thermal Analyzer

The main purpose of this article is to develop an environmentally friendly and economically effective process to produce silica from rice husk ash. Sodium silicate solution was prepared by the reaction of rice husk ash and sodium hydroxide solution, and then the sodium silicate solution was used as the raw material for the preparation of silica with sodium bicarbonate. During the reaction, the by-product can be passed into CO2 to prepare sodium bicarbonate what can be reutilized. Experimental route achieved resource recycling and environment-friendly, low energy consumption, zero emissions and so on. Meanwhile the microstructures of the silica powders were characterized by Transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and Thermo gravimetric/Differential thermal analyzer (TG-DTA).The purity of silicon was up to 99.43% and the particle size was 200-300nm.

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Effect of rice husk ash-derived activator on the structural build-up of alkali activated materials

Cement and Concrete Research ◽

10.1016/j.cemconres.2021.106590 ◽

2021 ◽

Vol 150 ◽

pp. 106590

Author(s):

Mohammed Fouad Alnahhal ◽

Abdelrahman Hamdan ◽

Ailar Hajimohammadi ◽

Taehwan Kim

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Alkali Activated

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Life cycle assessment and cost analysis of fly ash–rice husk ash blended alkali-activated concrete

Journal of Environmental Management ◽

10.1016/j.jenvman.2021.113140 ◽

2021 ◽

Vol 295 ◽

pp. 113140

Author(s):

Sarah Fernando ◽

Chamila Gunasekara ◽

David W. Law ◽

M.C.M. Nasvi ◽

Sujeeva Setunge ◽

...

Keyword(s):

Life Cycle Assessment ◽

Life Cycle ◽

Fly Ash ◽

Cost Analysis ◽

Rice Husk ◽

Rice Husk Ash ◽

Alkali Activated Concrete ◽

Alkali Activated

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Engineering properties of waste-based alkali activated concrete brick containing low calcium fly ash and rice husk ash: A comparison with traditional Portland cement concrete brick

Journal of Building Engineering ◽

10.1016/j.jobe.2021.103810 ◽

2021 ◽

pp. 103810

Author(s):

Sarah Fernando ◽

Chamila Gunasekara ◽

David W. Law ◽

M.C.M. Nasvi ◽

Sujeeva Setunge ◽

...

Keyword(s):

Fly Ash ◽

Portland Cement ◽

Rice Husk ◽

Rice Husk Ash ◽

Engineering Properties ◽

Portland Cement Concrete ◽

Cement Concrete ◽

Low Calcium ◽

Alkali Activated Concrete ◽

Alkali Activated

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Investigation of the waterproof property of alkali-activated metakaolin geopolymer added with rice husk ash

Journal of Cleaner Production ◽

10.1016/j.jclepro.2019.05.111 ◽

2019 ◽

Vol 230 ◽

pp. 603-612 ◽

Cited By ~ 17

Author(s):

Guangwei Liang ◽

Huajun Zhu ◽

Zuhua Zhang ◽

Qisheng Wu ◽

Jianzhou Du

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Metakaolin Geopolymer ◽

Alkali Activated

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Strength and Durability Performance of Alkali-Activated Rice Husk Ash Geopolymer Mortar

The Scientific World JOURNAL ◽

10.1155/2014/209584 ◽

2014 ◽

Vol 2014 ◽

pp. 1-10 ◽

Cited By ~ 20

Author(s):

Yun Yong Kim ◽

Byung-Jae Lee ◽

Velu Saraswathy ◽

Seung-Jun Kwon

Keyword(s):

Compressive Strength ◽

Rice Husk ◽

Rice Husk Ash ◽

Polymerization Reaction ◽

Strength Development ◽

Geopolymer Concrete ◽

Portland Cement Concrete ◽

Mix Proportion ◽

Strength And Durability ◽

Alkali Activated

This paper describes the experimental investigation carried out to develop the geopolymer concrete based on alkali-activated rice husk ash (RHA) by sodium hydroxide with sodium silicate. Effect on method of curing and concentration of NaOH on compressive strength as well as the optimum mix proportion of geopolymer mortar was investigated. It is possible to achieve compressive strengths of 31 N/mm2and 45 N/mm2, respectively for the 10 M alkali-activated geopolymer mortar after 7 and 28 days of casting when cured for 24 hours at 60°C. Results indicated that the increase in curing period and concentration of alkali activator increased the compressive strength. Durability studies were carried out in acid and sulfate media such as H2SO4, HCl, Na2SO4, and MgSO4environments and found that geopolymer concrete showed very less weight loss when compared to steam-cured mortar specimens. In addition, fluorescent optical microscopy and X-ray diffraction (XRD) studies have shown the formation of new peaks and enhanced the polymerization reaction which is responsible for strength development and hence RHA has great potential as a substitute for ordinary Portland cement concrete.

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