Enhancing pozzolanic properties of rice husk ash using acid leaching treatment

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

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Investigations on the Pozzolanic Properties of Residual Rice Husk Ash

Advances in Sustainable Construction Materials - Lecture Notes in Civil Engineering ◽

10.1007/978-981-33-4590-4_40 ◽

2021 ◽

pp. 421-431

Author(s):

N. K. Muhammed Koya ◽

Deepa G. Nair

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Pozzolanic Properties

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Pemanfaatan Abu Ampas Tebu dan Abu Sekam Padi Sebagai Pozzolan dengan Agregat Kasar Batu Skoria pada Beton Ringan Struktural

Rekayasa ◽

10.21107/rekayasa.v13i2.6246 ◽

2020 ◽

Vol 13 (2) ◽

pp. 112-117

Author(s):

Dwi Nurtanto ◽

Muhammad Fahad Kustantiyo ◽

Nanin Meyfa Utami ◽

Hernu Suyoso

Keyword(s):

Sugarcane Bagasse ◽

Rice Husk ◽

Rice Husk Ash ◽

Lightweight Concrete ◽

Agricultural Waste ◽

Combustion Products ◽

Silica Content ◽

Crushing Strength ◽

Volume Weight ◽

Pozzolanic Properties

Study ini membandingkan kuat hancur, berat volume antara beton ringan dengan beton dengan mengganti sebagian semen (PC) dengan limbah pertanian. Limbah pertanian yang dimaksud adalah sekam padi dan ampas tebu. Penggunaan limbah pertanian tersebut sebaga material pengganti semen dikarenakan mempunyai sifat pozzolan yang cukup tinggi. Pemakaian limbah pertanian ini dengan membakar ampas tebu dan sekam padi dengan suhu tertentu sehingga menjadi abu. Limbah tebu diambil dari Pabrik Gula Prajekan Bondowoso, dibakar dengan suhu 8000C selama 8 jam. Limbah Padi diambil dari limbah Pabrik Padi di Kalisat Jember, dibakar dengan suhu 8500C selama 45 menit. Kandungan silika dari hasil pembakaran tersebut masing-masing sebesar 59,5% dan 79,5% . Prosentase pengganti sebagian PC sebesar 5%, 10%, 15% dan 20%, dengan perbandingan campuran abu ampas tebu (AAT) dan abu sekam padi (ASP) adalah 1:1. Pengujian dilakukan pada umur 28 hari dengan bentuk benda uji silender berukuran 10x20 cm. Hasil kuat hancur tertinggi pada benda uji dengan subsitusi PC sebesar 5% dan berat volume yang terendah pada benda uji dengan pengantian semen sebesar 20%. Effect of Cement Substitution with Agricultural Waste on Lightweight Structural ConcreteThis study compares the shattering strength, volume weight between lightweight concrete and concrete by replacing part of the Portland cement (PC) with agricultural waste. The agricultural waste in question is rice husk and sugarcane bagasse. The use of agricultural waste is as a substitute for cement because it has quite high pozzolanic properties. Use of this agricultural waste by burning sugarcane bagasse and rice husk with a certain temperature so that it becomes ash. Sugarcane waste is taken from Bondowoso Prajekan Sugar Mill, burned at 8000C for 8 hours. Rice waste is taken from the rice factory waste in Kalisat Jember, burned at 8500C for 45 minutes. The silica content of the combustion products was 59.5% and 79.5%, respectively. The percentage of partial PC replacement is 5%, 10%, 15%, and 20%, with a ratio of bagasse ash (BA) to rice husk ash (RHA) is 1: 1. The test was carried out at 28 days in the form of a 10 x 20 cm slender test object. The highest yield of crushing strength in specimens with PC substitution of 5% and the lowest volume weight in specimens with cement replacement of 20%.

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EXPERIMENTAL INVESTIGATION OF THE POZZOLANIC POTENTIALS OF MILLET AND RICE HUSK ASH AS MINERAL ADDITIVE IN SELF-COMPACTING CONCRETE

Acta Polytechnica ◽

10.14311/ap.2020.60.0359 ◽

2020 ◽

Vol 60 (4) ◽

pp. 359-368

Author(s):

John Wasiu ◽

Fashina Ayoola Oluwatosin

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Agricultural Waste ◽

Modulus Of Rupture ◽

Beam Specimen ◽

Self Compacting Concrete ◽

Split Tensile Strength ◽

Compressive Strength Test ◽

Mineral Additive ◽

Pozzolanic Properties

Self-compacting concrete (SCC) is a new concept of concrete mix which flows in a formwork and consolidates itself without the need for compaction. Effectively compacting concrete can be very difficult especially in areas with a high number of reinforcement. Millet Husk Ash (MHA) and Rice Husk Ash (RHA) are agricultural waste materials obtained from farm and burnt to ashes to discard them since they are environmental waste. This research is focused on finding the pozzolanic potentials of MHA and RHA as a mineral additive in SCC to see if it will improve its properties rather than discarding them as environmental waste. Laboratory investigations were carried out on normally vibrated concrete (NVC) and SCC using MHA and RHA as an additive at a 10 % replacement with cement. Workability tests were carried out following the BS specifications. ASTM 293 C was used for the Flexural Capacity test on the beam specimen. The Results of the workability tests using MHA and RHA as mineral additive are within the specified standard values. The compressive strength test also revealed that the SCC using MHA is about 12.8 % higher than the RHA and NVC at 28 days with densities of 2487.5, 2516.5 and 2437.5kg/m3 respectively. The Modulus of Rupture (MoR) and Split Tensile strength for MHA is 0-19.2 % and 17.2-22.2 % higher than the RHA and NVC respectively. It was concluded that the improvement in the pozzolanic properties of MHA and RHA may be due to the content of Lime (CaO), Silica ((SiO2)), Alumina (Al2O3), Iron oxide (Fe2O3) being greater than 70 % and in an accordance with BS 618 code. It is concluded that the MHA and RHA can find suitable applications in the SCC as a mineral additive rather than discarding them as environmental waste.

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Effect of Acid Leaching on Different State of Rice Husk

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1010.532 ◽

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.

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Properties of Concrete with Different Percentange of the Rice Husk Ash (RHA) as Partial Cement Replacement

Materials Science Forum ◽

10.4028/www.scientific.net/msf.803.288 ◽

2014 ◽

Vol 803 ◽

pp. 288-293 ◽

Cited By ~ 21

Author(s):

Mustaqqim Abdul Rahim ◽

Norlia Mohamad Ibrahim ◽

Zulliza Idris ◽

Zuhayr Md Ghazaly ◽

Shahiron Shahidan ◽

...

Keyword(s):

Compressive Strength ◽

Rice Husk ◽

Rice Husk Ash ◽

Waste Product ◽

Economic Problem ◽

Cement Replacement ◽

Pozzolanic Material ◽

Chemical Content ◽

Partial Cement Replacement ◽

Pozzolanic Properties

The use of pozzolanic material from waste product as partial cement replacement in concrete contribute to reduce the environmental, economic problem through their waste and as well enhance the strength and properties of concrete. Rice husk ash (RHA) is one of the industrial waste that suitably used as a cement replacement due to its pozzolanic properties which can enhance the properties of concrete. In this study, the workability, compressive strength and water absorption of the concrete containg RHA is investigating. The chemical content of RHA also investigated by using X-ray Fluorescence Test (XRF). The different RHA percentage of 5%, 15% and 25% were used in this study with burning temperature 650°C. The concrete cube of size 100 mm x 100 mm x 100 mm were prepared and cured for 7, 14 and 28 days. Based on result, it was concluded that the optimum RHA replacement for cement in this report was 5 %, which provided the highest compressive strength at 28 days.

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