scholarly journals The Influence of Rice Husk Ash Addition on the Properties of Metakaolin-Based Geopolymers

2016 ◽  
Vol 10 (1) ◽  
pp. 406-417 ◽  
Author(s):  
Paulo H. R. Borges ◽  
Vitor A. Nunes ◽  
Tulio H. Panzera ◽  
Giorgio Schileo ◽  
Antonio Feteira
Keyword(s):  
Fourier Transform ◽  
Flexural Strength ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Plastic Behavior ◽  
High Deformation ◽  
Molar Ratios ◽  
Geopolymer Matrix ◽  
Alkali Activated Binders ◽  
Alkali Activated

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.

Systematic Review on Alkali-Activated Binders Blended with Rice Husk Ash

2021 ◽  
Vol 33 (9) ◽  
pp. 04021229
Author(s):  
Sarah Fernando ◽  
M. C. M. Nasvi ◽  
Chamila Gunasekara ◽  
David W. Law ◽  
Sujeeva Setunge ◽  
...  
Keyword(s):  
Systematic Review ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Alkali Activated Binders ◽  
Alkali Activated

Refluxed rice husk ash/NaOH suspension for preparing alkali activated binders

2014 ◽  
Vol 115 ◽  
pp. 72-74 ◽  
Author(s):  
N. Bouzón ◽  
J. Payá ◽  
M.V. Borrachero ◽  
L. Soriano ◽  
M.M. Tashima ◽  
...  
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Alkali Activated Binders ◽  
Alkali Activated

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

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

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

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

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

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

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

2019 ◽  
Vol 230 ◽  
pp. 603-612 ◽  
Author(s):  
Guangwei Liang ◽  
Huajun Zhu ◽  
Zuhua Zhang ◽  
Qisheng Wu ◽  
Jianzhou Du
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Metakaolin Geopolymer ◽  
Alkali Activated

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

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
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.

Properties of Unfired Building Bricks Prepared from Fly Ash and Residual Rice Husk Ash

2015 ◽  
Vol 754-755 ◽  
pp. 468-472 ◽  
Author(s):  
Chao Lung Hwang ◽  
Trong Phuoc Huynh
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Flexural Strength ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Fine Aggregate ◽  
Test Results ◽  
Design Algorithm ◽  
Potential Applications ◽  
Hardened Properties

This work investigates the possibility of using fly ash (FA) and Vietnam residual rice husk ash (RHA) in producing unfired building bricks with applying densified mixture design algorithm (DMDA) method. In this research, little amount of cement was added into the mixtures as binder substitution. Unground rice husk ash (URHA), an agricultural by-product, was used as partial fine aggregate replacement (10% and 30%) in the mixtures. The solid bricks of 220×105×60 mm in size were prepared in this study. The hardened properties of the bricks were investigated including compressive strength, flexural strength and water absorption according to corresponding Vietnamese standards. Forming pressure of 35 MPa was applied to form the solid bricks in the mold. The test results show that all brick specimens obtained good mechanical properties, which were well conformed to Vietnamese standard. Compressive strength and flexural strength of the bricks were respectively in range of 13.81–22.06 MPa and 2.25–3.47 MPa. It was definitely proved many potential applications of FA and RHA in the production of unfired building bricks.

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