scholarly journals Assessment of synthesis methods of SiO2 produced from rice husk and its main physicochemical characteristics

2019 ◽  
Vol 16 (3-4) ◽  
pp. 186-194
Author(s):  
K. Askaruly ◽  
Zh. Sartova ◽  
S. Azat ◽  
M. Yeleuov ◽  
A. Tauyrbekov
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Rice Variety ◽  
Geographical Area ◽  
Acid Leaching ◽  
Physicochemical Characteristics ◽  
Research Field ◽  
Waste Materials ◽  
Synthesis Methods ◽  
Human Beings

Extraction of silica from rice husk is an emerging trend in the current research field. Large amount of rice husk (RH) are treated as waste and disposed of at the landfill site. These waste materials can also cause fire, which may lead to severe environmental pollutions. The airborne particles produced from dust may induce respiratory disease to human beings. The burning of rice husk results in the formation of rice husk ash (RHA) with major SiO2 content with 10 to 20% of carbon and organic components depending on the burning conditions, the furnace type, the rice variety, the climate and the geographical area. Moreover, the commonly used silica precursor like tetraethoxysilane is more expensive, and hence rice husk ash(RHA) and other waste sources having silica are used as an alternative. Acid leaching of the rice husk can carried out to remove soluble elemental impurities and hence it increases the purity of the silica content. The organic compounds in rice husk and other waste materials can be decomposed under burning conditions. In recent years, environmental demand and sustainable development have become increasingly important. It is important to study and utilize RH biowaste, and convert RHs into valued materials. This is the focus of this research. This paper article will be methods of synthesis SiO2 from rice husk and its physical-chemical characteristics

Special Rice Husk Concrete in Egypt

2011 ◽  
Vol 71-78 ◽  
pp. 3271-3274
Author(s):  
Saeed Ahme Al Sheikh
Keyword(s):  
Construction Industry ◽  
Rice Husk ◽  
Ordinary Portland Cement ◽  
Rice Husk Ash ◽  
Construction Materials ◽  
Waste Materials ◽  
Agricultural Industry ◽  
Cement Ratio ◽  
Dark Clouds ◽  
Super Plasticizer

In the late few years, Egypt has been suffering from a dark clouds resulting from burning rice husk. Studies have been undergoing to study the possibility of using rice husk instead of burning it and soiling environment. The construction industry plays an important role in many countries. Waste materials are new challenge choice for use as construction materials, because construction materials coming from a natural source are irreversible. Rice Husk Ash (RHA) is one of waste materials from agricultural industry. It has some special characteristics that can enhance the properties of concrete, when it is used as a part of the ingredients in concrete mixes. The objective of this paper is to study the mechanical properties of concrete containing ordinary Portland cement, rice husk ash and super plasticizer compared to the silica fume concrete. The water cement ratio was equal to 35% by weight for all tested specimens whereas the slump was constant at 100 +/- 20 mm.

scholarly journals Utilization of Sustainable Materials to Enhance Geotechnical Characteristics of Soils

2018 ◽  
Vol 7 (2.1) ◽  
pp. 54
Author(s):  
Rama Subba Rao, G.V
Keyword(s):  
Rice Husk ◽  
Soil Stabilization ◽  
Rice Husk Ash ◽  
Geotechnical Engineering ◽  
Fine Sand ◽  
Waste Materials ◽  
Engineering Practice ◽  
Geotechnical Characteristics ◽  
Sustainable Materials ◽  
By Products

Geotechnical engineering can noticeably affect the sustainability of infrastructure development because of its beginning place in the construction practice. Utilization of waste materials for enhancing properties of the soil is a wise choice and is also one step towards accomplishing sustainable development. Application of by-products (viz., flay ash and rice husk ash) which could be defined as “sustainable materials”, find special place in the modern-day soil stabilization and modification exercise. The preset paper aims at enhancing properties of expansive soil with inclusion of industrial by-products namely Rice Husk ash and Fly Ash. Further the present paper focuses on improving geotechnical characteristics of fine sand upon reinforcing with ground shredded rubber tire. Fine sand has a low angle of internal friction and which in turn has low shear strength. Reuse of waste materials is one area of research which attempts to makes geotechnical engineering practice sustainable.  

scholarly journals Rice husk ash and its utilization in soil improvement: An overview

2020 ◽  
Vol 61 (3) ◽  
pp. 1-11 ◽  
Author(s):  
Duong Thanh Nguyen ◽  
Nu Thi Nguyen ◽  
Ha Ngoc Thi Pham ◽  
Hai Huu Phung ◽  
Hung Van Nguyen ◽  
...  
Keyword(s):  
Rice Husk ◽  
Rural Areas ◽  
Rice Husk Ash ◽  
Ground Improvement ◽  
Field Research ◽  
Soil Improvement ◽  
Waste Materials ◽  
Engineering Practice ◽  
Negative Effect ◽  
Soft Ground Improvement

The utilization of waste materials in soil improvement is the potential for the reduction of the negative effect on the environment and the construction cost as well. One of the waste materials is rice husk ash (RHA), which is an agricultural-by product and can be utilized for soil improvement. This paper aims to present a comprehensive review of the numerous investigations on rice husk ash and its utilization in soil improvement. Based on the literature review, there are some findings as follows: (i) burning rice husk ash in incinerator under a controlled temperature of 500÷8000C and time of 1÷4 hours will produce RHA with high pozzolanic activity; (ii) the RHA can be considered as a stabilizer for different types of soil, and it can be used in combination with different chemical binders and waste materials for soil improvement; (iii) from the view of engineering purposes, the RHA from about 3 to 20%, the lime from 2 to 9%, the cement from 2 to 15% were mostly suggested to improve the soil for pavement, road (base and sub-base layers), and building houses in rural areas. However, the research on the utilization of RHA in soft ground improvement by deep mixing method using lime and cement is still limited, and it is therefore recommended for further research. In addition, the experimental field research on the utilization of RHA for soil improvement in engineering practice needs to be conducted.

scholarly journals Strength and Durability Research on Concrete with Partial Replacement of Cement by Rice Husk Ash and Spent Bleaching Earth

2019 ◽  
Vol 8 (2S11) ◽  
pp. 1035-1040 ◽  
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Raw Materials ◽  
Bleaching Earth ◽  
Oil Industry ◽  
Waste Materials ◽  
Partial Replacement ◽  
Durability Test ◽  
Split Tensile Strength ◽  
Rice Milling

Concrete is the foremost building material in the region of the sphere and used in operational works, including infrastructure, low and high-rise buildings. Substitution of waste materials will conserve dwindling resources, and will avoid the environmental and ecological damages caused by quarrying and exploitation of the raw materials for making cement. So we are interested in replacement of cement with waste materials coming from oil industry and rice mill industry. So we are taking spent bleach earth (SBE) from oil industry & rice husk ash (RHA) from rice milling industry. W/c ratio as 0.38 and SP 430 IS used for obtaining required slump. The required slump is arrived at 0.7% of admixture. Following replacing the Cement with SBE 5%, 7.5%, 10% and RHA with 2%, 4%, 6%, 8%, 10% aimed at optimum results. Now SBE5% & RHA 8% got optimum values. Subsequently beams, cylinders, cubes are casted. Compressive strength, Split tensile strength, Flexural strength originate for 7 days & 28 days. Later 28 days curing cubes are placed in Hydrochloric acid (HCL) for durability test. For durability test cubes are submerged in 5% of HCL for additional 28days & find the Compression strength.

scholarly journals Green and Sustainable Concrete – The Potential Utilization of Rice Husk Ash and Egg Shells

2019 ◽  
Vol 5 (1) ◽  
pp. 74 ◽  
Author(s):  
Ashfaque Ahmed Jhatial ◽  
Wan Inn Goh ◽  
Kim Hung Mo ◽  
Samiullah Sohu ◽  
Imtiaz Ali Bhatti
Keyword(s):  
Calcium Oxide ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Pozzolanic Reaction ◽  
Waste Materials ◽  
Co2 Gas ◽  
Cement Replacement ◽  
Sustainable Concrete ◽  
Partial Cement Replacement ◽  
Carbon Dioxide Co2

Concrete which is widely used material in the construction industry, has a carbon footprint. Approximately 10% of global Carbon Dioxide (CO2) gas is emitted during the production of cement which is vital ingredient of concrete. The increase in production of cement affects global warming and climate change. Therefore, many have attempts have been made to develop green and sustainable concrete by utilizing different waste materials. With the utilization of waste materials as cement replacement, the CO2 gas emissions can be reduced as well as resolve the environmental issues that the inhabitants face during the disposal of such waste materials. This paper reviews the potential and innovative utilization of Rice Husk Ash (RHA) and Eggshells as partial cement replacement to develop green concrete. RHA which is rich in silica and eggshells contain identical amount of calcium oxide as cement, when finely grinded and used together as partial cement replacement, can trigger a pozzolanic reaction, in which silica reacts with calcium oxide resulting in the formation of calcium silicates which are responsible for achieving higher strengths.

scholarly journals Alleviation of arsenic accumulation in rice by applying silicon-rich rice husk residues in Bangladesh soil

2021 ◽  
Vol 56 (3) ◽  
pp. 195-206
Author(s):  
A Mamud ◽  
B Saha ◽  
SA Hossain ◽  
MTA Chowdhury
Keyword(s):  
Oryza Sativa ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Oryza Sativa L ◽  
Rice Variety ◽  
The Holocene ◽  
Arsenic Accumulation ◽  
Calcium Phosphorus ◽  
Boro Rice ◽  
Different Soils

While the accumulation of arsenic in rice (Oryza sativa L.) has been highlighted as a major concern in Bangladesh, sustainable measures are critically needed to reduce the uptake of arsenic by rice plants. In the present study, a pot-experiment was conducted using a Boro rice variety (BRRI dhan-29) in two geomorphologically different soils from Holocene floodplains and Pleistocene terraces, in which silicon-rich fresh rice husk (FRH) and rice husk ash (RHA) were applied, as silicon fertilisers, in the soils at the rate of 1% (w/w) of rice residue:soil.In the Holocene floodplain soils, the application of FRH was found to decrease arsenic in grain, husk and straw by 42, 56 and 51%, respectively, whereas the soil incorporation of RHA decreased arsenic in grain, husk and straw by 26, 37.5 and 36%, respectively. In the Pleistocene terrace soils, the application of FRH reduced the grain, husk and straw arsenic by 38, 38 and 44%, respectively, whereas the RHA decreased the grain, husk and straw arsenic by 26, 30 and 29%, respectively. Fresh rice husk was found to be more effective in alleviating arsenic accumulation in rice than RHA. In both the Holocene floodplain and Pleistocene terrace soils, the grain concentrations of calcium, phosphorus, silicon, and zinc were found to be increased with the decrease of arsenic in the grain due to the use of FRH and RHA. The present study suggests that silicon-rich rice husk residue scan be used as silicon fertilisers to reduce arsenic accumulation in rice in Bangladesh. Bangladesh J. Sci. Ind. Res.56(3), 195-206, 2021

Effect of Acid Leaching on Different State of Rice Husk

2020 ◽  
Vol 1010 ◽  
pp. 532-537
Author(s):  
Nur Haslinda Mohamed Muzni ◽  
Noorina Hidayu Jamil ◽  
Faizul Che Pa ◽  
Wan Mohd Arif
Keyword(s):  
Citric Acid ◽  
Rice Husk ◽  
Amorphous Silica ◽  
High Purity ◽  
Rice Husk Ash ◽  
Combustion Process ◽  
Acid Leaching ◽  
Silica Content ◽  
Composition Analysis ◽  
Surface Areas

Rice husks (RH) are agricultural wastes available abundantly in rice producing country. A by-product obtained from combustion of rice husk is rice husk ash (RHA) which is rich in silica (SiO2) contents. This paper focused on the effect of acid leaching treatment on rice husk to produce high-purity silica. There are 4 different states of conditions involved; raw rice husk (RRH), treated rice husk (TRH), rice husk ash (RHA), and treated rice husk ash (TRHA). Citric acid; C6H8O7 was used as a leaching agent. TRH and TRHA was leached to see whether treated rice husk before combustion (TRH) or treated rice husk after combustion (TRHA) will produce more high-purity silica. Chemical composition analysis shows high amorphous silica content which is 98.47% with low metallic impurities at 1.0M C6H8O7, 70 oC for treated rice husk (TRH). X-ray diffraction (XRD) pattern shows the presence of amorphous silica in treated rice husk (TRH) and crystalline silica in treated rice husk ash (TRHA). Fragmentation of TRH into small pieces after acid leaching is seen where there is significant increase in the exposed surface areas. High-purity amorphous silica with more than 98% was prepared via citric acid leaching treatment and combustion process.

scholarly journals PENGARUH PENAMBAHAN ABU CANGKANG KEMIRI TERHADAP KUAT TEKAN BETON K-300

2020 ◽  
Vol 3 (1) ◽  
pp. 12
Author(s):  
Moh. Abdul Basit Minanulloh ◽  
Yosef Cahyo ◽  
Ahmad Ridwan
Keyword(s):  
Compressive Strength ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Waste Materials ◽  
Normal Concrete ◽  
Cement Additive ◽  
Compressive Strength Of Concrete ◽  
Maximum Compressive Strength ◽  
Compressive Tests

K-300 concrete is concrete that has a characteristic compressive strength of 300 kg/cm2.  Many studies that use plantation and mining waste materials are simply wasted. These wastes are in the form of kemiri shell ash, rice husk ash, and others. in this study, kemiri shell ash as a cement additive, with variations in the addition of 5%, 10%, and 15% of the weight of cement to the quality of K-300 concrete. Concrete compressive tests carried out at the age of 7 and 28 days. The purpose of this study was to determine the compressive strength of concrete, the highest pressure strength, and the optimum percentage. Strong concrete pressure characteristics obtained at 28 days at a normal concrete variation 304.127 kg / cm, normal concrete variations with the addition of 5% “Abu Cangkang kemiri” 421,551 kg / cm, normal concrete variations with the addition of 10% “Abu Cangkang kemiri” 426,863 kg / cm2, and variations  normal concrete with the addition of 15% “Abu Cangkang kemiri” 428,210 kg / cm.  The results show that the optimum percentage of the addition of kemiri shell ash is 15% of the weight of cement with a maximum compressive strength of 428,210 kg/cm.  Beton K-300 adalah beton yang mempunyai kuat tekan karakteristik sebesar 300 kg/cm². Banyak penelitian yang menggunakan bahan – bahan limbah perkebunan dan tambang yang terbuang begitu saja. Limbah tersebut berupa abu cangkang kemiri, abu sekam Padi, dan lain- lain. Pada penelitian ini menggunakan abu cangkang Kemiri sebagai bahan tambah semen, dengan variasi penambahan 5%, 10%, dan 15%  dari berat semen terhadap mutu beton K-300. Uji tekan beton dilaksanakan pada umur 7 dan 28 hari. Tujuan penelitian ini adalah untuk mengetahui kuat tekan beton dan  kuat tekan tertinggi. Kuat tekan karakteristik yang diperoleh pada umur 28 hari pada variasi beton normal 304,127 kg/cm², variasi beton normal dengan penambahan 5% abu cangkang  Kemiri 421,551 kg/cm², variasi beton normal dengan penambahan10% abu cangkang Kemiri 426,863kg/cm², dan variasi beton normal dengan penambahan 15% abu cangkang Kemiri 428,210 kg/cm². Hasil penelitian menunjukkan bahwa presentase optimum dari penambahan abu cangang Kemiri  adalah sebesar15% dari berat semen dengan kuat tekan maksimum sebesar 428,210 kg/cm².

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