The Effect of Rice Husk on the Chemical Properties of Clay Soil

The aim of this work was to prepare mesoporous silicas derived from rice husk ash (RHA) using three different depolymerizing agents; glycerol, 1,3 propanediol and 1,4 butanediol. The reaction of RHA with different depolymerizing agents was carried out between 200-250°C for 2 hrs. The solution was then hydrolyzed with deionized water to obtain gels. After a few washing step, gels were oven-dried and calcined at 500 °C for 24 hrs. Prepared mesoporous silicas were then characterized using Nitrogen adsorption-desorption measurement, FTIR, TGA, SEM, XRD and XRF. The percent hydrophobicity was determined based on the amount of moisture absorbed using TGA. It was shown that RHA reacted with depolymerizing agents above 200°C to form gels, which, after hydrolysis and calcination, still maintained the mesoporous characteristics. The BET and SEM results indicated that the RHA reacted with 1,3 propanediol had highest pore volume (0.95 cm3/g) and specific surface area (129.30 m2/g) compared to RHA reacted with glycerol and 1,4 butanediol. The distribution of pores computed from BJH desorption branch was also more uniform. FTIR indicated that there was no significant change in the chemical structure of RHA reacted with different depolymerizing agents. The residual C-H bands were found in FTIR spectra for all prepared mesoporous silicas. TGA thermograms confirmed the existence of organic residues (below 2 %wt), which might result from incomplete elimination even after calcination. This was found to be an important factor affecting the hydrophobic property of the reacted RHA. The hydrophobicity of RHA may be tailored by controlling depolymerizing agents and organic residues. Depolymerizing agents with longer carbon chains also favoured the hydrophobic characteristics.

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Rice husk as an alternative energy for cement production and its effect on the chemical properties of cement

MATEC Web of Conferences ◽

10.1051/matecconf/201819501009 ◽

2018 ◽

Vol 195 ◽

pp. 01009

Author(s):

Agus Maryoto ◽

Gathot Heri Sudibyo

Keyword(s):

Energy Source ◽

Rice Husk ◽

Alternative Energy ◽

Combustion Process ◽

Chemical Properties ◽

National Standard ◽

Insoluble Residue ◽

Cement Production ◽

Chemical Content ◽

The Impact

Production of rice husk in Central Java province is around 2,825,000 tonnes annually. It can be used as an alternative energy source to substitute coal in combustion during cement production. This study was conducted to determine the impact of rice husk as a substitute energy source in cement production. The observations of rice husk comprised calorimetric tests, physical and chemical tests, and percentage rice husk substitution for coal as firing energy. The chemical properties of the cement tested include the chemical content, MgO and SO3 contents, loss on ignition, insoluble residue, and total alkali. The results show that the chemical content of cement which is produced using rice husk as a substitute for coal in the combustion process still meets the Indonesian National Standard.

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Hydrothermal Synthesis of TiO2/SiO2 Hybrid Photocatalyst from Rice Husk Ash

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.352.281 ◽

2007 ◽

Vol 352 ◽

pp. 281-285 ◽

Cited By ~ 2

Author(s):

P. Sujaridworakun ◽

Supatra Jinawath ◽

W. Panpa ◽

Akira Nakajima ◽

Masahiro Yoshimura

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Uv Light ◽

Porous Silica ◽

Chemical Properties ◽

Nano Crystalline ◽

Ultraviolet Ray ◽

Physical And Chemical ◽

Hydrolysis Of ◽

Fine Tio2

Photocatalyst materials were prepared as a hybrid between TiO2 /SiO2 via low temperature hydrothermal method (150oC) without further heat treatment. Porous silica from rice husk ash was used as a support for fine TiO2 particles which acted as a photocatalyst when radiated with a UV light. TiO2-deposited SiO2 was successfully prepared through hydrolysis of TiOSO4 solution by controlling synthesis parameters such as pH ,concentration of TiOSO4, temperature and time under hydrothermal treatment. The obtained products were characterized for physical and chemical properties by means of XRD, XRF, BET and TEM . It was found that pH had an influence on the crystallization of TiO2, and under an appropriated pH, only anatase presented along with amorphous phase. High crystallinity of nano-crystalline anatase ( about 5 nm) deposited on silica surface was observed through TEM. Adsorption and photocatalytic performances of the prepared catalyst were evaluated in methylene blue aqueous solution in the dark and under ultraviolet ray irradiation, respectively. Due to the synergetic functions of adsorption by porous substrate and decomposition by TiO2 photocatalyst, an enhancing of photocatalytic activity for decomposition of organic pollutants in water under UV rays was obtained.

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Development of Geopolymer Mortar from Metakaolin Blended with Agricultural and Industrial Wastes

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.766.305 ◽

2018 ◽

Vol 766 ◽

pp. 305-310 ◽

Cited By ~ 1

Author(s):

Chayanee Tippayasam ◽

Sarochapat Sutikulsombat ◽

Jamjuree Paramee ◽

Cristina Leonelli ◽

Duangrudee Chaysuwan

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Rice Husk ◽

Rice Husk Ash ◽

Chemical Properties ◽

Cement Industry ◽

Industrial Wastes ◽

Engineering Properties ◽

Alkali Solutions ◽

Physical And Chemical

Geopolymer is a greener alternative cement produced from the reaction of pozzolans and strong alkali solutions. Generally, the cement industry is one of largest producers of CO2that caused global warming. For geopolymer mortar usage, Portland cement is not utilized at all. In this research, geopolymer mortars were prepared by mixing metakaolin, various wastes (fly ash, bagasse ash and rice husk ash) varied as 80:20, 50:50 and 20:80, 15M NaOH, Na2SiO3and sand. The influence of various parameters such as metakaolin to ashes ratios and pozzolans to alkali ratios on engineering properties of metakaolin blended wastes geopolymer mortar were studied. Compressive strength tests were carried out on 25 x 25 x 25 mm3cube geopolymer mortar specimens at 7, 14, 21, 28 and 91 air curing days. Physical and chemical properties were also investigated at the same times. The test results revealed that the highest compressive strength was 20% metakaolin - 80% fly ash geopolymer mortar. When the curing times increases, the compressive strength of geopolymer mortar also increases. The mixing of metakaolin and bagasse ash/rice husk ash presented lower compressive strength but higher water absorption and porosity. For FTIR results, Si-O, Al-O and Si-O-Na+were found. Moreover, the geopolymer mortar could easily plastered on the wall.

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The effects of cement and natural zeolite additives on problematic clay soils

Science and Engineering of Composite Materials ◽

10.1515/secm-2012-0104 ◽

2013 ◽

Vol 20 (4) ◽

pp. 395-405 ◽

Cited By ~ 23

Author(s):

Murat Turkoz ◽

Pinar Vural

Keyword(s):

Natural Zeolite ◽

Clay Soil ◽

Expansive Soils ◽

Chemical Properties ◽

Soil Samples ◽

Clay Soils ◽

Engineering Structures ◽

Significant Strength ◽

Strength Tests ◽

Physical And Chemical

AbstractDispersive and expansive soils are considered problematic, and these soil properties cause serious problems for many engineering structures. For many years, comprehensive studies have been carried out with the aim of improving the swelling and dispersive qualities of soils by using additives. Each feature in the literature associated with the improvement of the dispersive and swell properties of clay soil with additives was separately evaluated. In this study, the effect of cement and natural zeolite additives on the characteristics of dispersibility and swelling potential of clay soils were investigated. A fixed percentage of cement (3%) plus different percentages of natural zeolite (1%, 3%, 6%, 10%, 15%, and 20%) were mixed with four different clay soil samples. In this context, first, the physical and chemical properties of the soil samples were determined. Next, the swell percentage, swell pressure, crumb, pinhole and unconfined compressive strength tests at different curing times were performed on samples with and without the additive by compressing the sample to achieve particular compaction characteristics. Significant strength value increases depended on curing time, and the properties were improved with the mixture of cement and zeolite additives, depending on the sodium adsorption ratio (SAR) and exchangeable sodium percentage (ESP) values of clay soil samples with different plasticity characteristics that exhibit dispersive and swell properties. This study not only showed that a mixture of cement and zeolite additives improved the dispersive and swell properties of clay soil samples with four different plasticity characteristics, depending on their SAR and ESP values, but also significant increases in strength values were observed.

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Influence of Rice Husk Ash and Fly Ash on Properties of Red Clay

Journal of Scientific Research ◽

10.3329/jsr.v6i3.15343 ◽

2014 ◽

Vol 6 (3) ◽

pp. 421-430 ◽

Cited By ~ 8

Author(s):

M.S. Sultana ◽

M.I. Hossain ◽

M.A. Rahman ◽

M.H. Khan

Keyword(s):

Fly Ash ◽

Water Absorption ◽

Rice Husk ◽

Rice Husk Ash ◽

Chemical Properties ◽

Xrd Analysis ◽

Linear Shrinkage ◽

Red Clay ◽

Clay Deposits ◽

Percentage Of Water Absorption

Effects of rice husk ash and fly ash on properties of red clay collected from Naogaon district of Bangladesh were investigated. Different percentages of rice husk ash (RHA) and fly ash (5%, 10% and 15%) were thoroughly mixed with clay to analyse various physical and chemical properties of clay followed by heat treatment of 8000C to 11000C. The samples were tested for compressive strength, linear shrinkage, water absorption, porosity and bulk density. XRD analysis indicates the clay sample was mainly illite type. Water absorption and porosity increased with increasing percentage of ashes. The percentage of water absorption was within 6 to 10% for different mixture which may be suitable for ceramic and tiles purposes. Both fly ash and RHA of 15% could be used to improve some properties of clay. The optimum firing temperature for all the samples was 10500C. XRD pattern of clay with fly ash and rice husk ash heated at 10500C confirms the presence of feldspar and quartz as major phase and hematite (Fe2O3) and cristobalite phase as minor phase. This red clay deposits reinforced with different appropriate quantities of rice husk ash and fly ash could be used for various low temperature applications in industry and construction purposes. © 2014 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. doi: http://dx.doi.org/10.3329/jsr.v6i3.15343 J. Sci. Res. 6 (3), 421-430 (2014)

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