scholarly journals Use of SiO2 Rice Husk Ash and Ni in Materials Solid Hydrogen Storage Based on MgH2

2020 ◽  
Vol 9 (1) ◽  
pp. 9-12
Author(s):  
Taufik Taufik ◽  
Zulkarnain A Jalil ◽  
Mursal Mursal
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Solid Hydrogen ◽  
Main Phase ◽  
Grinding Process ◽  
Test Results ◽  
Preparation Techniques

Telah dilakukan penyisipan silika (SiO2) dan nikel (Ni) ke dalam MgH2 dengan menggunakan teknik preparasi mechanical alloying. Hasil observasi dengan XRD menunjukkan bahwa proses pemilingan selama 2 jam material MgH2 + Ni + SiO2 berhasil direduksi hingga skala nanokristal. Fasa yang muncul, dari hasil pengujian dengan XRD adalah fasa MgH2 sebagai fasa utama, sedangkan fasa Ni dan fasa SiO2 sebagai fasa minor. Hasil pengamatan dengan TGA pada sampel MgH2 + 5 %wt Ni + 3 %wt SiO2,hidrogen mengalami desorpsi pada temperatur 362,04oC sebesar 10,3 %wt selama 3,58 menit. Hasil pengamatan pada sampel MgH2 + 5 %wt Ni + 15 %wt SiO2, hidrogen mengalami desorpsi pada temperatur 351,4oC sebesar 10,3 %wt selama 3,77 menit. Silica (SiO2) and nickel (Ni) insertion into MgH2 has been carried out using mechanical alloying preparation techniques. The results of observations with XRD showed that the grinding process for 2 h of MgH2 + Ni + SiO2 material successfully reduced to the nanocrystal scale. The phase that emerges, from the test results using XRD is the MgH2 phase as the main phase, while the Ni and SiO2 phases are minor phases. Observations using TGA on MgH2 + 5% wt Ni + 3% wt SiO2 samples, the hydrogen undergoes desorption at 362.04oC of 10.3% wt for 3.58 min. And the results of observations on MgH2 + 5% wt Ni + 15% wt SiO2 samples, the hydrogen undergoes desorption at 351.4oC at 10.3% wt for 3.77 min. Keywords: Silica, Nickel, MgH2, mechanical alloying, nanocrystal

Physical Properties of Cement Mortar Containing Waste Ash

2015 ◽  
Vol 804 ◽  
pp. 129-132
Author(s):  
Sumrerng Rukzon ◽  
Prinya Chindaprasirt
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Cement Mortar ◽  
Ash Content ◽  
Water Requirement ◽  
Test Results ◽  
Pozzolanic Material ◽  
Materials Used

This research studies the potential for using waste ash from industrial and agricultural by-products as a pozzolanic material. Classified fly ash (FA) and ground rice husk ash (RA) were the materials used. Water requirement, compressive strength and porosity of cement mortar were investigated. Test results indicated that FA and RA (waste ash) have a high potential to be used as a good pozzolanic material. The water requirement of mortar mix decreases with the increases in fly ash content. For ground rice husk ash (RA), the water requirement of mortar mix increases with the increases in rice husk ash content. In addition, the reduction in porosity was associated with the increase in compressive strength.

Properties of Unfired Building Bricks Prepared from Fly Ash and Residual Rice Husk Ash

2015 ◽  
Vol 754-755 ◽  
pp. 468-472 ◽  
Author(s):  
Chao Lung Hwang ◽  
Trong Phuoc Huynh
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Flexural Strength ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Fine Aggregate ◽  
Test Results ◽  
Design Algorithm ◽  
Potential Applications ◽  
Hardened Properties

This work investigates the possibility of using fly ash (FA) and Vietnam residual rice husk ash (RHA) in producing unfired building bricks with applying densified mixture design algorithm (DMDA) method. In this research, little amount of cement was added into the mixtures as binder substitution. Unground rice husk ash (URHA), an agricultural by-product, was used as partial fine aggregate replacement (10% and 30%) in the mixtures. The solid bricks of 220×105×60 mm in size were prepared in this study. The hardened properties of the bricks were investigated including compressive strength, flexural strength and water absorption according to corresponding Vietnamese standards. Forming pressure of 35 MPa was applied to form the solid bricks in the mold. The test results show that all brick specimens obtained good mechanical properties, which were well conformed to Vietnamese standard. Compressive strength and flexural strength of the bricks were respectively in range of 13.81–22.06 MPa and 2.25–3.47 MPa. It was definitely proved many potential applications of FA and RHA in the production of unfired building bricks.

scholarly journals Mechanical and Durability Properties of Aerated Concrete Incorporating Rice Husk Ash (RHA) as Partial Replacement of Cement

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 604
Author(s):  
Tariq Ali ◽  
Abdullah Saand ◽  
Daddan Khan Bangwar ◽  
Abdul Salam Buller ◽  
Zaheer Ahmed
Keyword(s):  
Aluminum Powder ◽  
Rice Husk ◽  
Industrial Ecology ◽  
Rice Husk Ash ◽  
Partial Replacement ◽  
Type I ◽  
Fine Aggregate ◽  
Test Results ◽  
Durability Properties ◽  
Aerated Concrete

In today’s world, the implementation of industrial ecology for sustainable industrial development is a common practice in the field of engineering. This practice promotes the recycling of by-product wastes. One of those by-product wastes is rice husk ash. This paper describes an investigation into the effect of rice husk ash (RHA) as a partial replacement for cement, to produce lightweight, aerated concrete. Type I Portland cement, fine aggregate, and aluminum powder as an aerating agent were used in this study. The RHA was used in different replacement levels, i.e., RHA was used to replace cement at 0%, 2.5%, 5%, 7.5%, 10%, 12.5% and 15% by weight. Aluminum powder was added during mixing at 0.5% by weight of binder to obtain lightweight, aerated concrete. Test results are presented in terms of physical, mechanical, and durability aspects that include density, compressive strength, split tensile strength, and flexural strength of concrete cured at different curing regimes, i.e., 3, 7, 28, and 90 days along with corrosion analysis, and sulphate attack at 28 days of curing. The test results show that using 10% RHA as a partial replacement of cement in aerated concrete is beneficial in triggering the strength and durability properties of concrete.

scholarly journals Intermetallic Compounds Synthesized by Mechanical Alloying for Solid-State Hydrogen Storage: A Review

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5758
Author(s):  
Yuchen Liu ◽  
Djafar Chabane ◽  
Omar Elkedim
Keyword(s):  
Hydrogen Storage ◽  
Mechanical Alloying ◽  
Intermetallic Compounds ◽  
Physical Adsorption ◽  
Solid Hydrogen ◽  
Hydrogen Energy ◽  
Hydrogen Storage Materials ◽  
Storage Method ◽  
Storage Materials ◽  
Storage Technology

Hydrogen energy is a very attractive option in dealing with the existing energy crisis. For the development of a hydrogen energy economy, hydrogen storage technology must be improved to over the storage limitations. Compared with traditional hydrogen storage technology, the prospect of hydrogen storage materials is broader. Among all types of hydrogen storage materials, solid hydrogen storage materials are most promising and have the most safety security. Solid hydrogen storage materials include high surface area physical adsorption materials and interstitial and non-interstitial hydrides. Among them, interstitial hydrides, also called intermetallic hydrides, are hydrides formed by transition metals or their alloys. The main alloy types are A2B, AB, AB2, AB3, A2B7, AB5, and BCC. A is a hydride that easily forms metal (such as Ti, V, Zr, and Y), while B is a non-hydride forming metal (such as Cr, Mn, and Fe). The development of intermetallic compounds as hydrogen storage materials is very attractive because their volumetric capacity is much higher (80–160 kgH2m−3) than the gaseous storage method and the liquid storage method in a cryogenic tank (40 and 71 kgH2m−3). Additionally, for hydrogen absorption and desorption reactions, the environmental requirements are lower than that of physical adsorption materials (ultra-low temperature) and the simplicity of the procedure is higher than that of non-interstitial hydrogen storage materials (multiple steps and a complex catalyst). In addition, there are abundant raw materials and diverse ingredients. For the synthesis and optimization of intermetallic compounds, in addition to traditional melting methods, mechanical alloying is a very important synthesis method, which has a unique synthesis mechanism and advantages. This review focuses on the application of mechanical alloying methods in the field of solid hydrogen storage materials.

scholarly journals AIR CONTENT OF SELF-CONSOLIDATING CONCRETE AND ITS MORTAR PHASE INCLUDING RICE HUSK ASH / ORO KIEKIS SAVITANKIAME BETONE IR JO SKIEDINIO DALYJE SU RYŽIŲ LUKŠTŲ PELENAIS

2011 ◽  
Vol 17 (3) ◽  
pp. 319-329 ◽  
Author(s):  
Md. Safiuddin ◽  
Jeffrey S. West ◽  
Khaled A. Soudki
Keyword(s):  
Rice Husk ◽  
Strong Correlation ◽  
Simple Technique ◽  
Rice Husk Ash ◽  
Test Results ◽  
Excellent Correlation ◽  
Self Consolidating Concrete ◽  
Air Content ◽  
Cementing Material

This paper presents the air content results of self-consolidating concrete (SCC) and its mortar phase including rice husk ash (RHA) as a supplementary cementing material. Moreover, this paper demonstrates a simple technique to determine the dosage of air-entraining admixture (AEA) required for the target air content in SCC. Different SCC mixtures were designed based on the water/binder (W/B) ratios of 0.30–0.50 and design air content of 4–8%. RHA was incorporated in the concretes substituting 0–30% of cement by weight. The mortars were formulated from the mixture proportions of the corresponding parent concretes and tested to determine the air content at various AEA dosages. The effects of W/B ratio and RHA content on the air content of both mortar and concrete were observed. The effect of mortar volume on the air content of concrete was also noticed. Besides, the AEA dosages required for the target air contents of concrete were estimated based on the equivalent mortar air contents. Later the air-entrained SCC mixtures were produced using AEA and tested for the air content. Test results exhibit that the air contents of both mortar and concrete were significantly influenced by the W/B ratio and RHA content. The concrete air content was also greatly influenced by its mortar volume. The AEA dosage increased with lower W/B ratio, higher RHA content, and greater mortar volume for the target air contents. In addition, the actual AEA dosages were consistent with the estimated AEA dosages of the concretes. An excellent correlation was observed between the actual and estimated AEA dosages. The strong correlation suggests that the AEA dosage needed for a target air content in concrete can be determined based on the equivalent air content of its mortar phase. Santrauka Straipsnyje pateikiami oro kiekio nustatymo savitankiame betone (SCC) ir jo skiedinio dalyje su ryžių lukštų pelenais (RHA), naudojamais kaip papildoma cementavimo medžiaga, rezultatai. Be to, pateikiamas paprastas būdas parinkti orą įsiurbiančio priedo (AEA) dozę, siekiant gauti reikalingą oro kiekį SCC. Suprojektuoti skirtingi SCC mišiniai su skirtingu vandens ir rišiklio (W/B) 0,30–0,50 santykiu ir numatytu 4–8 proc. oro kiekiu, RHA buvo dedamas į betoną pakeičiant 0–30 proc. cemento pagal masę. Skiediniai buvo formuojami pagal jiems artimo betono sudėtis ir oro kiekis juose bandomas su skirtingomis AEA dozėmis. Nustatyta W/B santykio ir RHA kiekio įtaka oro kiekiui tiek skiedinyje, tiek betone bei skiedinio tūrio įtaka oro kiekiui betone. Be to, AEA dozės, reikalingos numatytam oro kiekiui betone pasiekti, nustatytos pagal ekvivalentinį oro kiekį skiedinyje. Vėliau SCC mišiniai su orą įsiurbiančiu priedu buvo pagaminti naudojant AEA ir išbandytas juose esantis oro kiekis. Tyrimų rezultatai rodo, kad tiek skiedinį, tiek betono oro kiekį labai veikia W/B santykis ir RHA kiekis. Oro kiekį betone taip pat smarkiai veikia skiedinio tūris. Mažėjant W/B santykiui, didėjant RHA kiekiui ir skiedinio tūriui AEA dozė turi būti didinama norimam oro kiekiui pasiekti. Taip pat faktinės AEA dozės atitiko suskaičiuotas betonų AEA dozes. Tarp faktinių ir suskaičiuotų AEA dozių gauta labai gera koreliacija. Ji rodo, kad AEA dozę, reikalingą numatytam oro kiekiui betone pasiekti, galima skaičiuoti pagal ekvivalentinį oro kiekį šio betono skiedinio dalyje.

scholarly journals Pemanfaatan Material Lokal Dan Produk Samping Industri Sebagai Agregat Batu Pecah Dan Filler terrhadap Kinerja Marshall pada Campuran Panas Aspal Beton Lapis Permukaan Aus (ACWC)

2019 ◽  
Vol 2 (1) ◽  
pp. 1
Author(s):  
Dedy Asmaroni ◽  
Taurina Jemmy Irwanto
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Limestone Powder ◽  
Test Results ◽  
Coarse Aggregates ◽  
A Value ◽  
Local Material ◽  
Density Flow ◽  
Marshall Test ◽  
Local Materials

The use of ACWC asphalt as a surface layer in Madura continues to increase as traffic growth increases following the opening of the Suramadu Bridge. In addition to having the advantages of stability in accepting loads compared to other types of surface layers, ACWC asphalt is also easily made and carried out in the field. However, asphalt mixing plant (AMP) companies in Madura still use materials from outside Madura as coarse aggregates such as river breaking stones and fly ash and cement used as fillers to improve stability. Based on this, this research was carried out by utilizing local meter which has the same properties in the form of local Madura crushed stone which will be used as coarse aggregate and industrial by-products in the form of rice husk ash (by-product of brick industry) and limestone powder (limestone mining byproducts ) used as filler. For this purpose samples were made with the percentage of filler used was 2%, 4%, 6%, 8% and 10%. Marshall test testing includes calculation of density, flow, VMA, VIM, VFB, and stability. From the test results, AC-WC uses local materials with both types of filler, namely Limestone and Rice Husk Ash. There is one type of mixture that meets the Marshall characteristics, namely the use of local materials and filler of limestone 8% asphalt variation 6.5%. With a value of 2,285 Density, 1,852,863 kg Stability, Flow 3,467 mm, Marshall Quotient 534,48 kg / mm, VIM 3,058%, V.M.A 15,941%, VFB 80,819%. While the local material and fillers of Rice Husk Ash from the results of Marshall Test for Flow, VIM, and VFB did not meet the requirements so that the use of rice husk ash filler could not be used as a substitute for cement.

scholarly journals A Study on the Strength Aspects of Concrete with Metakaolin, GGBFS and Rice Husk Ash as Partial Replacement of OPC

2021 ◽  
Vol 889 (1) ◽  
pp. 012072
Author(s):  
Amit Sharma ◽  
Sanjeev Gupta
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Research Work ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials ◽  
Engineering Properties ◽  
Partial Replacement ◽  
Test Results ◽  
Conventional Concrete ◽  
The Impact

Abstract The impact of the OPC on the environment is important as its production generates a large amount of CO2. In order to reduce the use of pure raw materials as resources, the use of industrial waste or secondary materials in construction sites for the production of cement and concrete has been encouraged. The volume of wastes generated worldwide has increased over the years due to the population, social and economic performance and social development. One of the most attractive options for waste management is to minimize waste and reuse the possibility of recycling. The cost of cement used in concrete works is increasing and unsatisfactory, but the demand for this material and other housing needs is rising, so it is important to find alternatives that can be used alone or in a partial replacement. In this research work several auxiliary cementitious ingredients such as metakaoline, GGBFS and Rice Husk Ash (RHA) were used to improve the strength properties of the conservative concrete. Metakaolin and GGBFS was used at a fixed percentage of 10 percent as fractional substitution of the OPC-43 grade cement, while the RHA was used at different percent ranging from 0 to 25 percent at an increment of 5 percent in each case as fractional substitution of the OPC-43 grade cement. Numerous examinations were executed so as to envisage the effect of these materials over the strength and engineering properties of the concrete. The test results conclude that the usage of the metakaolin, GGBFS and the RHA in combined form increased the strength and engineering properties of the conventional concrete up to a great extent. From the obtained test results it can be further concluded that the particle size of the supplementary cementitious materials plays a significant role in enhancing the internal micro-structure of the concrete and which further leads to the higher strength of the concrete. Also the main reason behind the advanced strength was the presence of the metakaolin and GGBFS in the concrete, whose chemical properties densifies the concrete and made the concrete more stable and promotes higher strength. Future work can also be done on the usage of several other supplementary cementitious materials at different other percentages so as to improve concrete properties.

scholarly journals Sintesis Membran Kitosan-Silika Abu Sekam Padi Untuk Penurunan Logam Berat Cu dengan Proses Ultrafiltrasi

2019 ◽  
Vol 4 (2) ◽  
Author(s):  
Deasy Amanda Valentine ◽  
Sri Aprilia ◽  
Fauzi M Djuned
Keyword(s):  
Rice Husk ◽  
Performance Test ◽  
Rice Husk Ash ◽  
Morphological Structure ◽  
Inversion Method ◽  
Test Results ◽  
Asymmetric Structures ◽  
Membrane Performance ◽  
Dead End ◽  
Phase Inversion Method

<p>This study chitosan membranes were made by phase inversion method by adding rice husk ash silica additives to the casting solution. This study aims to create and evaluate the characteristics of chitosan-silica rice husk ash membranes for application in reducing Cu heavy metals. Chitosan membrane modification is needed to produce membranes with better character, for example increasing membrane stability, reducing pore size so that the separation of molecules or rejection of macromolecules from a membrane solution is more effective. The concentration of chitosan-silica rice husk ash was varied at 20, 19, 17 and 15 (% by weight). The resulting membrane was further characterized for morphological structure parameters by scanning electron microscopy (SEM), fourier transform infrared (FTIR). Flux and solution rejection using dead-end filtration modules. The SEM test results show that the membrane has pores with asymmetric structures. Membrane performance test on Cu metal has a rejection value of 38%, 39%, 46% and 62% with flux gain reaching 0.4135 to 15.4377 L / hr.</p>

scholarly journals Influence of Rice Husk Ash on the Properties of Concrete

2016 ◽  
Vol 9 (1) ◽  
pp. 29-33
Author(s):  
MB Hossain ◽  
KM Shaad ◽  
MS Rahman ◽  
P Bhowmik
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Lightweight Concrete ◽  
Physical And Mechanical Properties ◽  
Test Results ◽  
Structural Concrete ◽  
Conventional Concrete

This research was carried out to investigate various physical properties of Rice Husk Ash (RHA) and, some physical and mechanical properties of concrete incorporating RHA in different proportions. The concrete specimens were tested at 7, 21 and 28 days after curing. Test results revealed that the specific gravity of RHA was found lower than that of sand. The density of concrete containing RHA was recorded between 80-110 lb.ft-3, which is lower than conventional concrete. Water absorption was found increasing with the increase of RHA content in concrete specimens. There were significant variations in compressive strength values of concrete containing 5%, 10% and 20% volume of RHA. The compressive strength of 5% RHA specimen was 150-200% higher than that of other specimens. Hence, upto 5% replacement of RHA could be recommended for making normal lightweight concrete. The splitting tensile strength was about 9-10% of compressive strength. It was concluded that upto 5% RHA can be used effectively in making normal lightweight concrete. The higher percentage of RHA could be used in making non-structural concrete where the strength of concrete is not concerned.J. Environ. Sci. & Natural Resources, 9(1): 29-33 2016

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