Enhanced properties of high-silica rice husk ash-based geopolymer paste by incorporating basalt fibers

In the last few decades, the demand for cement production increased and caused a massive ecological issue by emitting 8% of the global CO2, as the making of 1 ton of ordinary Portland cement (OPC) emits almost a single ton of CO2. Significant air pollution and damage to human health are associated with the construction and cement industries. Consequently, environmentalists and governments have ordered to strongly control emission rates by using other ecofriendly supplemental cementing materials. Rice husk is a cultivated by-product material, obtained from the rice plant in enormous quantities. With no beneficial use, it is an organic waste material that causes dumping issues. Rice husk has a high silica content that makes it appropriate for use in OPC; burning it generates a high pozzolanic reactive rice husk ash (RHA) for renewable cement-based recyclable material. Using cost-effective and commonly obtainable RHA as mineral fillers in concrete brings plentiful advantages to the technical characteristics of concrete and to ensure a clean environment. With RHA, concrete composites that are robust, highly resistant to aggressive environments, sustainable and economically feasible can be produced. However, the production of sustainable and greener concrete composites also has become a key concern in the construction industries internationally. This article reviews the source, clean production, pozzolanic activity and chemical composition of RHA. This literature review also provides critical reviews on the properties, hardening conditions and behaviors of RHA-based concrete composites, in addition to summarizing the research recent findings, to ultimately produce complete insights into the possible applications of RHA as raw building materials for producing greener concrete composites—all towards industrializing ecofriendly buildings.

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The Effect of Utilizing Rice Husk Ash on Some Properties of Concrete - A Review

Current World Environment ◽

10.12944/cwe.13.2.07 ◽

2018 ◽

Vol 13 (2) ◽

pp. 224-231 ◽

Cited By ~ 2

Author(s):

Deepinder Singh Aulakh ◽

Jaspal Singh ◽

Sarvesh Kumar

Keyword(s):

Construction Industry ◽

Rice Husk ◽

Blast Furnace Slag ◽

Nutritional Value ◽

Rice Husk Ash ◽

Cementitious Material ◽

Supplementary Cementitious Material ◽

High Silica ◽

Million Cubic Meter ◽

Furnace Slag

World environmental pollution is having direct and visible influence of construction industry. Relatively, 10 quintal of CO2emitted by the manufacturing of 10 quintal of ordinary portland cement (OPC), which accounts almost seven percent of the global CO2 emissions. Averagely, ten thousand million cubic meter of concrete is produced yearly. Byproducts like rice husk ash (RHA), fly ash, blast-furnace slag, metakaolin and silica fume will be able to utilize as supplementary cementitious material because of their pozzolanic behavior. Rice husk cannot be used as animal’s feed due to the low nutritional value. Neither can it be discarded as landfill nor by burning because it arise a great environment challenge. By converting rice husk into rice husk ash (RHA), it can be used in concrete as a fractional substitution of cement because of high silica quantity in RHA. In this present paper, the result of some authors with the use RHA as a fractional substitution of cement on the properties of concrete like workability, permeability, compressive and tensile strength are reviewed.

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Synthesis of Geopolymer Paste as Coating Material Based on Kaolinite and Rice Husk Ash

Materials Science Forum ◽

10.4028/www.scientific.net/msf.841.79 ◽

2016 ◽

Vol 841 ◽

pp. 79-82 ◽

Cited By ~ 5

Author(s):

Ruth Meisye Kaloari ◽

Syamsidar ◽

Sulfiana ◽

Abdul Haris ◽

Subaer

Keyword(s):

Thermal Properties ◽

Rice Husk ◽

Fire Protection ◽

Room Temperature ◽

Chemical Resistance ◽

Rice Husk Ash ◽

Good Condition ◽

Coating Material ◽

Coated Material ◽

Geopolymer Paste

The purpose of this research is to study the properties of geopolymer paste based on metakaolin and rice husk ash (RHA) as coating material. Geopolymer paste was produced through alkaline activation method added with rice husk ash as much as 15% relative to the mass of metakaolin. The coating was achieved by painting the substrates with geopolymer paste. The coated material were cured at 60 °C for 3 hours. Samples were left at room temperature until seven days before any testing was conducted. The chemical resistance of the sample was studied by immersing the samples into (H2SO4) 1% for three days and it was found that the coated material was still in good condition. The presence of RHA was found to improve the thermal properties of geopolymer paste. The results showed that geoplymer paste was an excellent coating material for chemical and fire protection.

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Optimum Partial Replacement of Cement by Nanosilica, Microsilica and Rice Husk Ash for Mass Production of Concrete

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.751.544 ◽

2017 ◽

Vol 751 ◽

pp. 544-549

Author(s):

Winai Ouypornprasert ◽

Narong Traitruengtatsana ◽

Kong Kamollertvara

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Activity Index ◽

Silica Content ◽

Partial Replacement ◽

Mass Concrete ◽

Mean Values ◽

Nonnormal Distributions ◽

Concrete Production ◽

High Silica

The objective of this technical paper was to propose the use of optimum partial replacement of cement by pozzolan of high-silica content i.e. nanosilica, silica fume and rice husk ash. Firstly cement hydration, pozzolanic reactions of pozzolan and stoichiometry were reviewed. Then the optimum fractional replacement of cement by pozzolan based on the complete consumption of calcium hydroxide and the strength activity index (SAI) were formulated and proposed. After that the results of a series of tests of cement mortars were shown to verify the proposed concepts. The applicability for the mass concrete production was demonstrated by prediction of mean values of nonnormal distributions from the corresponding specifications.

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Growth of SiC and SiO2 Nanostructures Prepared from Rice Husk Ash Using Carbon-Metal Assisted

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.236-238.1807 ◽

2011 ◽

Vol 236-238 ◽

pp. 1807-1810 ◽

Cited By ~ 1

Author(s):

Samred Kantee ◽

Panya Mahachai ◽

Supakorn Pukird

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Distilled Water ◽

The Sun ◽

X Rays ◽

Argon Gas ◽

Si Substrates ◽

Alumina Boat ◽

High Silica ◽

Scanning Electron

This work suggested the growth of SiC and SiO2nanostructures from heating of rice husk ash and carbon-metal assisted. The rice husk was boiled in 1 M hydrochloric acid solution with temperature of around 90 °C for 1 hour, and then washed in distilled water and dried under the sun. The dried acid-treated rice husk was burned in the furnace with normal air for 1 hour, then high purity SiO2was produced. The high silica ash mixed with Cu or SnO2powder and coconut shell charcoal were grounded for mixtures powder. The mixtures powder and Si substrates were placed on the alumina boat and put in the middle of furnace. The furnace was heated at high temperature under atmosphere of argon gas. The heated products and Si substrates were studied by X-rays diffraction and scanning electron microscope. The SiC and SiO2nanostructures were observed.

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Mechanoactivation Of Rice Husk Ash In Laboratory Conditions

Promyshlennoe i Grazhdanskoe Stroitel stvo ◽

10.33622/0869-7019.2019.11.20-26 ◽

2019 ◽

pp. 20-26

Keyword(s):

Mechanical Activation ◽

Rice Husk ◽

Amorphous Silica ◽

Silicon Oxide ◽

Rice Husk Ash ◽

Pozzolanic Activity ◽

Maximum Solubility ◽

Laboratory Conditions ◽

Before And After ◽

Mineral Additive

In many rice producing countries of the world, including in Vietnam, various research aimed at using rice husk ash (RHA) as a finely dispersed active mineral additive in cements, concrete and mortars are being conducted. The effect of the duration of the mechanoactivation of the RHA, produced under laboratory conditions in Vietnam, on its pozzolanic activity were investigated in this study. The composition of ash was investigated by laser granulometry and the values of indicators characterizing the dispersion of its particles before and after mechanical activation were established. The content of soluble amorphous silicon oxide in rice husk ash samples was determined by photocolorimetric analysis. The pizzolanic activity of the RHA, fly ash and the silica fume was also compared according to the method of absorption of the solution of the active mineral additive. It is established that the duration of the mechanical activation of rice husk ash by grinding in a vibratory mill is optimal for increasing its pozzolanic activity, since it simultaneously results in the production of the most dispersed ash particles with the highest specific surface area and maximum solubility of the amorphous silica contained in it. Longer grinding does not lead to further reduction in the size of ash particles, which can be explained by their aggregation, and also reduces the solubility of amorphous silica in an aqueous alkaline medium.

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