Production and Characterization of Wood Ash Pozzolan of Melina and Cashew Tropical Woods

2020 ◽  
Vol 11 (10) ◽  
pp. 735-742
Author(s):  
Annune J. Eric ◽  
Nwafor Christiana ◽  
Shawon M. Caesar ◽  
Ahmed Yakubu Ahmed
Keyword(s):  
Chemical Composition ◽  
Aluminum Oxide ◽  
Construction Industry ◽  
Wood Ash ◽  
Potassium Oxide ◽  
Cement Production ◽  
Binding Material ◽  
Sulphur Trioxide ◽  
Tropical Woods

In an attempt to find an alternative binding material for construction industry, this study considered the use of wood ash from two different hardwoods namely: Melina wood ash and Cashew wood ash as a pozzolan in cement production. The study investigates the chemical composition (silica (SiO2), aluminum oxide (Al2O3), ferric oxide (Fe2O3), calcium oxide (CaO), magnesium oxide (MgO), sulphur trioxide (SO3), sodium oxide (Na2O) and potassium Oxide (K2O)) of the ashes and the clinker.

scholarly journals Characterization of mica from bodonchiin gol deposit (Mongolia)

2019 ◽  
pp. 23-27
Author(s):  
Zolzaya Ts ◽  
Oyun-Erdene G ◽  
Temuujin J
Keyword(s):  
Chemical Composition ◽  
Aluminum Oxide ◽  
Silicon Dioxide ◽  
Specific Surface ◽  
Research Work ◽  
Acid Leaching ◽  
Potassium Oxide ◽  
X Ray ◽  
Surface Areas ◽  
Leaching Condition

Although there are many mica deposits in Mongolia, there is no substantial study of the composition of the mica and the chemical composition and on their utilization. In this work, we characterized the minerals composition of two different samples which was located on the surface (mica-1) and in 10 m depth from the surface (mica-2) of the Bodonchin river deposit from Altai sum, Khovd province (Mongolia). The main objective of this research work was to prepare nanoporous materials from clay minerals by a different acid leaching condition. In order to evaluate the leaching characteristics, the chemical composition, mineral composition, bonding characteristics and specific surface area of mica samples were determined by X-ray fluorescence, X-ray diffractometer, FTIR and BET method, respectively. The main chemical composition of mica sample-1 consists of silicon dioxide 45.68%, and aluminum oxide 31.22%, potassium oxide 10.51% while mica sample-2 contains silicon dioxide 45.2%, and aluminum oxide 38.5%, potassium oxide 10.31%, respectively. These samples also contained the lesser amount of iron and magnesium. The specific surface areas vary from 13.11 to 14.65 m2/g. The main mineral compound of both mica samples was muscovite (KAl2(AlSi3O10)(OH)2. There is negligible influence of the sample’s location on the chemical and mineralogical compositions of the mica. Бодончийн голын гялтгануурын найрлага, шинж чанарын судалгаа Хураангуй: Монгол оронд гялтгануурын орд газрууд цөөнгүй байдаг хэдий ч гялтгануурын нөөцийг нарийвчлан тогтоож, химийн найрлага болон эрдэс зүйн судалгааг хийсэн дорвитой судалгааны ажил төдийлөн байхгүй байна. Бид энэхүү судалгааны ажилдаа Ховд аймгийн, Алтай сумын Бодончийн голын гялтгануурын ордын ил газрын гадарга (гялтгануур-1) болон гүнийн (гялтгануур-2) гэсэн хоёр дээжийг сонгон авч шинж чанар, эрдэс бүрдэл зэргийг нарийвчлан судаллаа. Энэхүү судалгааны ажлын гол ач холбогдол нь өөрийн орны шаварлаг эрдсийг ашиглан шинэ материал гарган авах буюу өөрөөр хэлбэл, шаварлаг эрдсийг янз бүрийн нөхцөлд хүчлийн уусгалтанд оруулан нано нүх сүвэрхэг материал гарган авах ажлын үндсэн суурь судалгааны материал болох юм.Гялтгануурын дээжнүүдийн химийн найрлагыг рентгенфлуоросценц (XRF), эрдсийн найрлагыг рентгендиффрактометр (XRD), функциональ бүлгүүдийг нил улаан туяаны спектроскопийн арга (FTIR) болон нунтгийн хувийн гадаргуугийн талбайг багажит шинжилгээний аргаар (BET) тус тус тодорхойллоо.Химийн найрлагын хувьд гялтгануур-1 дээжинд цахиурын оксид 45.68%, хөнгөнцагааны оксид 31.22%, гялтгануур-2 дээжинд цахиурын оксид 45.2%, хөнгөнцагааны оксид 38.5% тус тус агуулагдаж байна. Мөн бага хэмжээний төмөр болон магни агуулсан байгааг тогтоолоо. Дээжнүүдийн хувийн гадаргуугийн талбай 13.11 - 14.65 м2/г байна. Гялтгануурын эрдсийн найрлагын судалгаагаар дээрхи 2 дээжинд голлон мусковитын (KAl2(AlSi3O10)(OH)2) төрлийн эрдэс байгааг тогтоолоо. Түлхүүр үг: гялтгануур, мусковит, шаварлаг эрдэс, биотит .

scholarly journals Characteristics of Blended Cements Produced from Selected Hardwood Ashes

2018 ◽  
Vol 3 (1) ◽  
Author(s):  
Akeem A Raheem ◽  
Blessing O Orogbade
Keyword(s):  
Chemical Composition ◽  
Wood Ash ◽  
Heat Of Hydration ◽  
Cement Clinker ◽  
Potassium Oxide ◽  
Cassia Siamea ◽  
Suitable Material ◽  
Blended Cements ◽  
Setting Times ◽  
Portland Cement Clinker

In an attempt to find an alternative binding material for construction industry, this study considered the use of wood ash from three different hardwoods namely: Tectonagrandis, Cassia siamea and Vitellariaparadoxa as a pozzolan in cement production. The study investigates the chemical composition (silica (SiO2), aluminum oxide (Al2O3), ferric oxide (Fe2O3), calcium oxide (CaO), magnesium oxide (MgO), sulphur trioxide (SO3), sodium oxide (Na2O) and potassium Oxide (K2O)) of the ashes and the clinker. The production of blended cements were carried out in the factory by replacing 5- 50% by weight of Ordinary Portland Cement Clinker with the ashes during the manufacturing process. The cement without wood ash serves as the control. The physical characteristic (fineness, initial and final setting times, heat of hydration and residue on 45µm sieve), and the chemical composition of the blended cements were also investigated. The results showed that all the wood ashes (Tectonagrandis ash (TGA), Cassia siamea ash (CSA) and Vitellariaparadoxa ash (VPA)) were suitable material for use as pozzolan since they satisfied the requirement for such a material by having a combined SiO2, Fe2O3 and Al2O3 of more than 70%. The TGA, CSA and VPA blended cements satisfied standard requirements for up to 20% replacement level. It was concluded that all the wood ashes were suitable for use in the production of blended cements.

scholarly journals Chemical and Physical Characteristics of Blended Cements Produced from Softwood Ash

2018 ◽  
Vol 1 (March 2018) ◽  
pp. 1-7
Author(s):  
B.O Orogbade ◽  
A.A Raheem
Keyword(s):  
Chemical Composition ◽  
Wood Ash ◽  
Heat Of Hydration ◽  
Cement Clinker ◽  
Potassium Oxide ◽  
Agricultural Residue ◽  
Suitable Material ◽  
Blended Cements ◽  
Setting Times ◽  
Portland Cement Clinker

In an attempt to convert agricultural residue to alternative binding material for use in construction industry, this research considered the use of wood ash from Anacardium- occidentale (kaju) wood which is softwood as a pozzolan in cement production. In this study, the chemical composition (silica (SiO.), aluminum oxide (AI,O,), ferric oxide (Fe,O,), calcium oxide (CaQ), magnesium oxide (MgO), sulphur trioxide (SO,), sodium oxide (Na,O) and potassium Oxide (K,O)) of the ashes and the clinker was investigated. The production of blended cements were carried out in the factory by replacing 5- 50% by weight of Ordinary Portland Cement Clinker with the ashes during the manufacturing process. The cement without wood ash serves as the control. The physical characteristic (fineness, initial and final setting times, heat of hydration and residue on 45um sieve), and the chemical composition of the blended cements were also investigated. The results showed that Anacardiumoccidentale ash (AOA) was a suitable material for use as pozzolan since it satisfied the requirement for such a material by having a combined SiO, Fe,O,and Al,O,of more than 70% according to ASTM C 618. The AOA blended cements satisfied standard requirements for up to 20% replacement level. It was concluded that the wood ash was suitable for use in the production of blended cements.

scholarly journals Design and Characterization of Gypsum Mortars Dosed with Polyurethane Foam Waste PFW

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1497 ◽  
Author(s):  
Isabel Santamaría Vicario ◽  
Lourdes Alameda Cuenca-Romero ◽  
Sara Gutiérrez González ◽  
Verónica Calderón Carpintero ◽  
Ángel Rodríguez Saiz
Keyword(s):  
Natural Resources ◽  
Construction Industry ◽  
Polyurethane Foam ◽  
Industrial Waste ◽  
Vapour Permeability ◽  
Polyurethane Waste ◽  
New Material ◽  
Technical Specifications ◽  
Mechanical Strengths

The properties and the behaviour of plaster mortars designed with Polyurethane Foam Waste (PFW) are studied in this investigation. A characterization of the mixtures is completed, in accordance with the technical specifications of European Norms. The incorporation of polyurethane waste foam can yield porous and lighter mortars, with better resistance to water-vapour permeability, although with weaker mechanical strength and higher levels of absorbency. Nevertheless, suitable mechanical strengths were achieved, resulting in a new material that is compliant with the requirements of the construction industry. The use of PFW in the the manufacture of gypsum mortars for construction reduces the consumption of natural resources and, at the same time, recovers an industrial waste that is otherwise difficult to recycle.

scholarly journals Synthesis, Characterization of Chitosan-Aluminum Oxide Nanocomposite for Green Synthesis of Annulated Imidazopyrazol Thione Derivatives

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1160
Author(s):  
Abir S. Abdel-Naby ◽  
Sara Nabil ◽  
Sarah Aldulaijan ◽  
Ibtisam M. Ababutain ◽  
Azzah I. Alghamdi ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Aluminum Oxide ◽  
Reaction Medium ◽  
Thiol Group ◽  
Docking Studies ◽  
Significant Loss ◽  
Gram Negative Bacteria ◽  
Organic Catalyst ◽  
Group 1

Chitosan-aluminum oxide nanocomposite was synthesized, characterized, and used as a green heterogeneous catalyst to synthesize novel imidazopyrazolylthione derivatives. Nanocomposite polymeric material was characterized by EDS-SEM and XRD. The powerful catalytic activity, and its base character of the nanocomposite, was used to synthesize imidazopyrazolylthione (1) in a good yield compared to traditional cyclocondensation synthesis. Using the nanocomposite catalyst, substitution of the thiol group (1) afforded the corresponding thiourea (2) and the corresponding ester (3). The efficiency of the nanocomposite over the traditional base organic catalyst, Et3N and NaOH, makes it an effective, economic, and reproducible nontoxic catalyst. Moreover, the heterogeneous nanocomposite polymeric film was easily isolated from the reaction medium, and recycled up to four times, without a significant loss of its catalytic activity. The newly synthesized derivatives were screened as antibacterial agents and showed high potency. Molecular docking was also performed for a more in-depth investigation. The results of the docking studies have demonstrated that the docked compounds have strong interaction energies with both Gram-positive and Gram-negative bacteria.

scholarly journals Extraction and Mass Spectrometric Characterization of Terpenes Recovered from Olive Leaves Using a New Adsorbent-Assisted Supercritical CO2 Process

Foods ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1301
Author(s):  
Zully J. Suárez Montenegro ◽  
Gerardo Álvarez-Rivera ◽  
Jose A. Mendiola ◽  
Elena Ibáñez ◽  
Alejandro Cifuentes
Keyword(s):  
Aluminum Oxide ◽  
Silica Gel ◽  
Supercritical Co2 ◽  
Olive Leaves ◽  
Fractionation Process ◽  
Selective Enrichment ◽  
Adsorption Desorption ◽  
First Time ◽  
By Products

This work reports the use of GC-QTOF-MS to obtain a deep characterization of terpenoid compounds recovered from olive leaves, which is one of the largest by-products generated by the olive oil industry. This work includes an innovative supercritical CO2 fractionation process based on the online coupling of supercritical fluid extraction (SFE) and dynamic adsorption/desorption for the selective enrichment of terpenoids in the different olive leaves extracts. The selectivity of different commercial adsorbents such as silica gel, zeolite, and aluminum oxide was evaluated toward the different terpene families present in olive leaves. Operating at 30 MPa and 60 °C, an adsorbent-assisted fractionation was carried out every 20 min for a total time of 120 min. For the first time, GC-QTOF-MS allowed the identification of 40 terpenoids in olive leaves. The GC-QTOF-MS results indicate that silica gel is a suitable adsorbent to partially retain polyunsaturated C10 and C15 terpenes. In addition, aluminum oxide increases C20 recoveries, whereas crystalline zeolites favor C30 terpenes recoveries. The different healthy properties that have been described for terpenoids makes the current SFE-GC-QTOF-MS process especially interesting and suitable for their revalorization.

scholarly journals Structural Factors Inducing Cracking of Brass Fittings

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3255
Author(s):  
Lenka Kunčická ◽  
Michal Jambor ◽  
Adam Weiser ◽  
Jiří Dvořák
Keyword(s):  
Chemical Composition ◽  
Plastic Flow ◽  
Beta Phase ◽  
Alpha Phase ◽  
Structural Factors ◽  
Transmission Electron ◽  
Medical Gas ◽  
Hot Die Forging ◽  
Multiple Step

Cu–Zn–Pb brasses are popular materials, from which numerous industrially and commercially used components are fabricated. These alloys are typically subjected to multiple-step processing—involving casting, extrusion, hot forming, and machining—which can introduce various defects to the final product. The present study focuses on the detailed characterization of the structure of a brass fitting—i.e., a pre-shaped medical gas valve, produced by hot die forging—and attempts to assess the factors beyond local cracking occurring during processing. The analyses involved characterization of plastic flow via optical microscopy, and investigations of the phenomena in the vicinity of the crack, for which we used scanning and transmission electron microscopy. Numerical simulation was implemented not only to characterize the plastic flow more in detail, but primarily to investigate the probability of the occurrence of cracking based on the presence of stress. Last, but not least, microhardness in specific locations of the fitting were examined. The results reveal that the cracking occurring in the location with the highest probability of the occurrence of defects was most likely induced by differences in the chemical composition; the location the crack in which developed exhibited local changes not only in chemical composition—which manifested as the presence of brittle precipitates—but also in beta phase depletion. Moreover, as a result of the presence of oxidic precipitates and the hard and brittle alpha phase, the vicinity of the crack exhibited an increase in microhardness, which contributed to local brittleness.

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