Determination of Silica Activity Index and XRD, SEM and EDS Studies of Amorphous SiO2 Extracted from Rice Husk Ash

The rice in the south of Brazil is one of the main economy activities, which produce a large volume of waste coming from the beneficiation industries. The main goal of this research is evaluate the feasibility of use of rice husk ash, burning on fluidized flow (FF) and sliding grid (SG) for mortars. The characterization methods of rice husk ash (RHA) included loss on ignition, particle size distribution by laser, x-ray diffraction, x-ray fluorescence spectrometer, pozzolanic activity index and specific mass. Mortar specimens were molded with the proportion of 1:3 in mass and water/binder ratio of 0.51. The Portland cement was replaced by RHA with the proportion of 10%, 15% and 20%. Compressive strength, water absorption, air voids content, hydration-releasing heat curves, mercury intrusion porosimetry and scanning electron microscope were performed for all mortars. The mechanical performance of mortar with RHA replacement, shows to be satisfactory and feasible alternative for the final waste disposal.

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Measurement of Pozzolanic Activity Index of Scoria, Pumice, and Rice Husk Ash as Potential Supplementary Cementitious Materials for Portland Cement

Advances in Civil Engineering ◽

10.1155/2017/6952645 ◽

2017 ◽

Vol 2017 ◽

pp. 1-13 ◽

Cited By ~ 9

Author(s):

Hieronimi A. Mboya ◽

Cecil K. King’ondu ◽

Karoli N. Njau ◽

Alex L. Mrema

Keyword(s):

Portland Cement ◽

Rice Husk ◽

Rice Husk Ash ◽

Activity Index ◽

Cementitious Materials ◽

Pozzolanic Activity ◽

Supplementary Cementitious Materials ◽

X Ray Diffraction ◽

X Ray ◽

Setting Times

This work investigated the properties of scoria and pumice as supplementary cementitious materials (SCMs) for Portland cement and compared to those of rice husk ash (RHA). X-ray fluorescence, X-ray diffraction, and pozzolanic activity index (PAI) tests confirmed the suitability of these two materials as potential SCMs. Scoria and RHA samples achieved over 75% PAI at 7 days whereas pumice did this after 28 days. Initial and final mean setting times observed for the composite cement blended with these materials were 166 and 285 min, respectively. These setting times are longer than that of ordinary Portland cement but shorter compared to that of common Portland pozzolana cement. The ultimate mean compressive strengths achieved at 28 days of curing were 42.5, 44.8, and 43.0 MPa for scoria, pumice, and RHA, respectively, signifying that these materials are good SCMs. Higher fineness yielded higher ultimate mean strength. For instance, a scoria sample with a fineness of 575 m2/kg achieved the strength of 52.2 MPa after 28 days.

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Determination of amorphous silica in rice husk ash by a rapid analytical method

Cement and Concrete Research ◽

10.1016/s0008-8846(00)00466-x ◽

2001 ◽

Vol 31 (2) ◽

pp. 227-231 ◽

Cited By ~ 72

Author(s):

J Payá ◽

J Monzó ◽

M.V Borrachero ◽

A Mellado ◽

L.M Ordoñez

Keyword(s):

Rice Husk ◽

Amorphous Silica ◽

Analytical Method ◽

Rice Husk Ash

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Determination of Relationship between Dielectric Properties, Compressive Strength, and Age of Concrete with Rice Husk Ash Using Planar Coaxial Probe

Measurement Science Review ◽

10.1515/msr-2016-0003 ◽

2016 ◽

Vol 16 (1) ◽

pp. 14-20 ◽

Cited By ~ 5

Author(s):

Nawarat Piladaeng ◽

Niwat Angkawisittpan ◽

Sahalaph Homwuttiwong

Keyword(s):

Dielectric Constant ◽

Compressive Strength ◽

Dielectric Properties ◽

Rice Husk ◽

Rice Husk Ash ◽

Planar Structure ◽

Frequency Range ◽

The Relationship ◽

Coaxial Probe

Abstract This paper deals with an investigation of the dielectric properties of concretes that includes rice husk ash using a planar coaxial probe. The planar coaxial probe has a planar structure with a microstrip and coaxial features. The measurement was performed over the frequency range of 0.5-3.5 GHz, and concrete specimens with different percentages of rice husk ash were tested. The results indicated that the dielectric constant of the concretes was inversely proportional to the frequency, while the conductivity was proportional to the frequency. The dielectric constant decreased with the increasing age of the concrete at the frequency of 1 GHz. The conductivity of the concrete decreased with the increasing age of the concrete at the frequency of 3.2 GHz. In addition, the dielectric constant and the conductivity decreased when the compressive strength increased. It was also shown that the obtained dielectric properties of the concrete could be used to investigate the relationship between the compressive strength and age of the concrete. Moreover, there is an opportunity to apply the proposed probe to determine the dielectric properties of other materials.

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Determination of filler content in rice husk ash and wood-based composites by thermogravimetric analysis

Journal of Applied Polymer Science ◽

10.1002/app.1994.070511104 ◽

1994 ◽

Vol 51 (11) ◽

pp. 1875-1882 ◽

Cited By ~ 17

Author(s):

M. Y. Ahmad Fuad ◽

M. J. Zaini ◽

Mustafah Jamaludin ◽

Z. A. Mohd Ishak ◽

A. K. Mohd Omar

Keyword(s):

Thermogravimetric Analysis ◽

Rice Husk ◽

Rice Husk Ash ◽

Filler Content

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FTIR and TGA Analysis in Relation with the % Crystallinity of the SiO2 Obtained by Burning Rice Husk at Various Temperatures

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.585.77 ◽

2012 ◽

Vol 585 ◽

pp. 77-81 ◽

Cited By ~ 3

Author(s):

Pallavi Deshmukh ◽

Dilip Peshwe ◽

Shailkumar Pathak

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Waste Product ◽

Industrial Applications ◽

Amorphous Sio2 ◽

Nano Sio2 ◽

Different Temperatures ◽

Cheap Alternative ◽

Length Width ◽

Tga Analysis

Rice husk ash (RHA), a waste product of the rice industry, is rich in SiO2. The large amount of SiO2 freely obtained from it provides an abundant and cheap alternative to metallurgical grade SiO2 for many industrial applications. The detailed analysis of the physical dimensions such as length, width and thickness of four varieties (HMT, Sonam, 1001 and JSR) was done. The FTIR analysis of the ash obtained by burning rice husk at different temperatures proves the formation of nano SiO2. The study of the isothermal thermal degradation of the RHA was done by TGA analysis .During TGA analysis it was observed that, mass trace suddenly goes backwards along the abscissa and then continues forward normally. This characteristic behavior of the TGA plot was attributed to the formation of nano SiO2 during incineration of the RHA. The minimum value of the percentage crystallinity of the SiO2 at 500°C proved the formation of amorphous SiO2.

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Thermodynamics and Kinetics of Adoption of Ag (I) on Paramagnetic Silica Rice Husk Ash Surface

Acta Chimica Asiana ◽

10.29303/aca.v2i1.32 ◽

2019 ◽

Vol 2 (1) ◽

pp. 69

Author(s):

Wardian Antoni ◽

Saprini Hamdiani ◽

Siti Raudhatul Kamali

Keyword(s):

Kinetic Model ◽

Rice Husk ◽

Contact Time ◽

Metal Ion ◽

Rice Husk Ash ◽

Freundlich Isotherm ◽

Isotherm Model ◽

Optimal Conditions ◽

Thermodynamics And Kinetics

Synthesis of paramagnetic silica from rice husk ash has been carried out as an adsorbent for heavy metal Ag (I). This study tried to synthesis and characterized the thermodynamics and kinetics behaviour of paramagnetic silica from the husk ash as metal adsorbent Ag (I). Determination of optimal conditions for adsorption of metal ions Ag (I) is carried out by varying the pH, concentration, and contact time of the adsorbent. The results showed that the optimum pH was at pH 3, optimal concentration Ag(I) of 350 ppm and optimal contact time of 90 minutes. At optimal conditions, paramagnetic silica adsorption capacity for metal ion Ag (I) is 323.62 mg/g. The isotherm model that is suitable for paramagnetic silica is the Freundlich isotherm model. The kinetic model that is suitable for paramagnetic silica is the Pseudo Order 2 kinetic model.

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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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