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Synthesis and characterization of iron-doped GdMnO3 multiferroic ceramics 掺铁GdMnO3多铁陶瓷的合成与表征
IF 0.7 Q4 MATERIALS SCIENCE, COMPOSITES Pub Date : 2021-01-01 DOI: 10.14382/EPITOANYAG-JSBCM.2021.5
J. F. Ibrahim, A. Mergen, U. Parlak, E. Kurovics, M. Tihtih, L. Gömze
In this research work, monocrystalline Fe-doped GdMnO3 ceramics specimens were prepared through solid-state reaction technique, several characterization methods, for instance, Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Energy Dispersive Spectroscopy (EDX) and Vibrating Sample Magnetometer (VSM) were used to investigate the topographical, structural and magnetic behaviours of the produced samples. All the samples show a single phase which confirmed by XRD and SEM. Magnetic properties of all the prepared samples at the low temperature (10 K) showed antiferromagnetic behaviour with a small difference in magnetization. The slight change in magnetic characteristics could probably occur because of small lattice structural distortion. Fe-doped GdMnO3 could be a material of choice for multiferroic application showing a superior antiferromagnetic property.
本研究采用固相反应法制备了单晶掺铁GdMnO3陶瓷试样,采用扫描电镜(SEM)、x射线衍射(XRD)、能量色散谱(EDX)和振动样品磁强计(VSM)等表征方法研究了样品的形貌、结构和磁性行为。经XRD和SEM证实,样品均为单相。所有制备的样品在低温(10 K)下的磁性都表现为反铁磁性,磁化强度差异很小。磁特性的微小变化可能是由于晶格结构的微小畸变引起的。掺铁的GdMnO3具有优良的反铁磁性,是多铁性应用的理想材料。
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引用次数: 1
An investigation on the physical, mechanical and thermal properties of dune sand mortars lightened by expanded polystyrene beads (EPS) 膨胀聚苯乙烯微珠(EPS)轻化沙丘砂砂浆的物理、力学和热性能研究
IF 0.7 Q4 MATERIALS SCIENCE, COMPOSITES Pub Date : 2021-01-01 DOI: 10.14382/EPITOANYAG-JSBCM.2021.6
O. Herihiri, A. Guettala, B. Benabed
As the idea of sustainable development has been involved in all fields including construction and civil engineering, a huge amount of researches has focused on reducing energy use and protecting the environment, while at the same time ensuring the comfort of inhabitant. Taking on this viewpoint, the current work focuses on replacing natural materials with recycled and synthetic materials, to produce a new eco-material that satisfies the binary concept; minimizing cost and constructing light elements with complex geometry that promotes architectural innovation. The present work aims to mix design and study a mortar based on mixture of fine siliceous dune sand and crushed limestone sand lightened by expanded polystyrene (EPS). Sand was substituted by EPS with percentages of 0, 5, 10, 15, 20, 25 and 100%. The physical, mechanical and thermal properties of composite mortars were assessed according to the dry density, compressive strength, flexural strength, porosity, and conductivity. The obtained results show that, the use of EPS decreases the mechanical properties and the density of mortars. However, the thermal properties of mortars incorporating EPS were improved and meet the requirement for lightweight concrete constructions and insulation applications.
由于可持续发展的理念已经涉及到建筑、土木等各个领域,在保证居住者舒适的同时,减少能源消耗和保护环境成为大量研究的重点。基于这一观点,目前的工作重点是用回收材料和合成材料替代天然材料,以生产一种满足二元概念的新型生态材料;最大限度地降低成本,构建具有复杂几何形状的轻元素,促进建筑创新。本工作旨在设计和研究一种基于硅质沙丘砂和破碎的石灰石砂的混合砂浆,并用发泡聚苯乙烯(EPS)减轻。用EPS分别以0、5、10、15、20、25和100%的比例代替砂土。根据干密度、抗压强度、抗折强度、孔隙率和导电性对复合砂浆的物理、机械和热性能进行了评价。结果表明,EPS的使用降低了砂浆的力学性能和密度。然而,加入EPS的砂浆的热性能得到了改善,满足了轻质混凝土结构和保温应用的要求。
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引用次数: 0
Infrared transmission and properties of glasses in the PbO–B2 O3 –SiO2 –GeO2 system PbO-B2 O3 -SiO2 -GeO2体系中玻璃的红外透射及性能
IF 0.7 Q4 MATERIALS SCIENCE, COMPOSITES Pub Date : 2021-01-01 DOI: 10.14382/EPITOANYAG-JSBCM.2021.3
V. Goleus, Y. Hordieiev
A study of transparent materials for infrared emission is conditioned by the need for development and improvement of the optical and optoelectronic devices for space, aviation and medical purposes. Easily fusible optical glasses working in the nearand mid-infrared spectral region being characterized by a high refractive index are of great scientific and practical interest. The objective of these studies was to study influence of the chemical composition on the infrared transmission and properties of glasses in the PbO–B2O3–SiO2–GeO2 system. Conducted studies have testified to the fact that the transmission cutoff of glasses in the infrared region varies from 2.7 to 5.5 μm depending on the content of basic glass forming oxides B2O3, SiO2 and GeO2. The additive of fluoride to the compositions of glasses under study makes for the expansion of the transmission cutoff of infrared rays and the decrease in the intensity of absorption bands of the hydroxyl groups.
研究用于红外发射的透明材料的条件是发展和改进用于空间、航空和医疗目的的光学和光电子设备的需要。在近红外和中红外光谱区工作的易熔光学玻璃具有高折射率的特点,具有重要的科学和实用价值。这些研究的目的是研究PbO-B2O3-SiO2-GeO2体系中化学成分对玻璃红外透射率和性能的影响。研究表明,玻璃在红外区的透射截止率随碱性玻璃形成氧化物B2O3、SiO2和GeO2含量的不同而变化,范围在2.7 ~ 5.5 μm之间。在所研究的玻璃成分中加入氟化物,使红外线的透射截止增大,羟基的吸收带强度降低。
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引用次数: 3
The effects of partially replacing cement by glass waste powder on concrete properties 玻璃废粉部分替代水泥对混凝土性能的影响
IF 0.7 Q4 MATERIALS SCIENCE, COMPOSITES Pub Date : 2021-01-01 DOI: 10.14382/EPITOANYAG-JSBCM.2021.7
Antonio Bouty, F. Homsi
The cement production causes different types of pollution in addition to the high amount of energy needed for the manufacturing process, starting by the site extraction and ending by the factory production; at the same time millions of tons of glass waste are dumped yearly at landfills. This research verifies the possibility of partially replacing cement by glass waste powder (GWP) in new concrete mixes. For this purpose, two different concrete mixes having compressive strengths of 25 MPa and 32 MPa were made with 0%, 10%, 15%, 20% and 25% of GWP as a partial replacement of cement. The properties of fresh concrete mixes were determined by the slump, air content and flow table tests. Concerning the tests on hardened concrete, the compressive strength test was carried out on cylindrical specimens at 7, 14 and 28 days in addition to the water absorption and the tensile strength tests at 28 days. As a result, the partial replacement of cement by GWP showed no clear effect on the properties of the fresh concrete mixes. Whereas, 10% GWP in 25MPa concrete mix gave higher compressive and tensile strengths at 28 days and increased the moisture content; and 15% GWP in 32 MPa concrete mix gave the higher compressive strength at 28 days but decreased the tensile strength and the moisture content.
从现场提取到工厂生产,水泥生产过程需要大量的能源,除此之外,还会造成不同类型的污染;与此同时,每年有数百万吨玻璃废料被倾倒在垃圾填埋场。本研究验证了玻璃废粉在新型混凝土配合比中部分替代水泥的可能性。为此,用GWP的0%、10%、15%、20%和25%部分替代水泥配制了抗压强度分别为25 MPa和32 MPa的两种不同的混凝土配合比。通过坍落度试验、含气量试验和流台试验确定了新拌混凝土的性能。硬化混凝土试验除进行吸水试验和28天抗拉强度试验外,还进行了7、14、28天柱状试件抗压强度试验。结果表明,GWP部分替代水泥对新拌混凝土的性能没有明显影响。而在25MPa混凝土中掺入10% GWP可提高28 d抗压强度和抗拉强度,并增加含水率;在32 MPa中掺入15% GWP可提高28 d抗压强度,但降低抗拉强度和含水率。
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引用次数: 0
Evaluation of chloride resistance of silica fume and glass waste  MWCNT- geopolymer composite 硅灰和玻璃废料MWCNT-地聚合物复合材料的耐氯性评价
IF 0.7 Q4 MATERIALS SCIENCE, COMPOSITES Pub Date : 2020-04-01 DOI: 10.21203/rs.3.rs-20534/v1
H. Khater, Abdeen M. El-Nagar
The target of the present paper is to study the enhancement effect of MWCNT on geopolymer resistivity to chloride attack. Geopolymer composites were made from metakaolin and ground granulated blast furnace slag and to either 10 % silica fume or glass waste. The added MWCNT were in the ratio of 0.01: 0.09 % by weight. Results revealed the high resistivity and stability against magnesium chloride solution; in addition glass waste mixes acquired high mechanical strength as compared with silica fume mixes as related to the high amorphous structure as well as high finesty of glass waste as compared with silica fume. The results revealed an increased enhancement in characteristics of geopolymer composites with MWCNT up to 0.07 % in both matrices.
本文的目的是研究MWCNT对地聚合物抗氯侵蚀电阻率的增强作用。以偏高岭土和磨碎的粒状高炉矿渣以及10%的硅灰或玻璃废料为原料制备地聚合物复合材料。添加的MWCNT重量比为0.01:0.09%。结果表明,该材料对氯化镁溶液具有较高的电阻率和稳定性;此外,与硅灰混合物相比,玻璃废料混合物获得了高机械强度,这与高非晶结构以及与硅灰相比玻璃废料的高精细度有关。结果表明,含MWCNT的地聚合物复合材料的特性在两种基质中均提高了0.07%。
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引用次数: 1
Potentials of calcined clay as a pozzolan 煅烧粘土的潜力,如火山灰
IF 0.7 Q4 MATERIALS SCIENCE, COMPOSITES Pub Date : 2020-01-01 DOI: 10.14382/epitoanyag-jsbcm.2020.11
O. Adekitan, M. Popoola
Calcined clay (CC) is a promising pozzolan recently attracting research attention globally. Various investigations have shown the desirable attributes of the material as a Supplementary Cementitious Material (SCM) in cement concrete systems. This paper captures the compressive strengths impact of calcined clay-Portland cement (CC-PC) as binders in both concrete and soil systems. Grade 20 concrete cubes were prepared and tested; adopting five CC-PC binder blends obtained by replacing PC with CC at 0(control), 5, 10, 15, and 20%; designated as PC100, PC95, PC90, PC85, and PC80, respectively. Similarly, four CC-PC binder blends PC100(control), PC75, PC50, and PC25 were adopted to stabilise samples of A-2-6 lateritic soils at increasing content of 0, 2.5, 5, 7.5, 10% of the soil’s weight. Results show that compressive strengths of the concrete samples increase with cement replacement. PC80 impacts the highest strengths with 7, 28 and 56-day strength activity indices (SAIs) of 174.7, 126.0 and 144.9%, respectively. In soil stabilisation, unconfined compressive strength (UCS) of the soil was found to increase with binder contents (2.5% to 10%) for the four binder designations. Compared to control (PC100), the PC75, and PC50 binders were better stabilisers with 7 and 28-day SAIs ranging between 105 and 275%, respectively. From the results, for applications across concrete and soil stabilisation works, CC has been shown to be a potential supplementary material for mitigating carbon emission without compromising on strength enhancement.
煅烧粘土(CC)是近年来在世界范围内备受关注的一种极具发展前景的火山灰。各种研究表明,该材料的理想属性作为补充胶凝材料(SCM)在水泥混凝土体系。本文捕获的抗压强度的影响,煅烧粘土波特兰水泥(CC-PC)作为粘合剂在混凝土和土壤系统。制备并试验了20级混凝土立方体;采用以0(对照)、5、10、15、20%的CC代替PC得到的5种CC-PC粘结剂共混物;分别指定为PC100、PC95、PC90、PC85和PC80。同样,采用4种CC-PC粘结剂混合物PC100(对照)、PC75、PC50和PC25分别增加0、2.5、5、7.5和10%土壤重量的含量来稳定A-2-6红土样品。结果表明:随水泥置换,混凝土试样抗压强度增大;PC80的7、28和56 d强度活性指数(SAIs)分别为174.7、126.0和144.9%,对强度影响最大。在土壤稳定中,发现土壤的无侧限抗压强度(UCS)随着粘结剂含量的增加而增加(2.5%至10%)。与对照(PC100)相比,PC75和PC50结合剂是更好的稳定剂,7天和28天的SAIs分别在105和275%之间。从结果来看,对于混凝土和土壤稳定工程的应用,CC已被证明是一种潜在的补充材料,可以在不影响强度增强的情况下减少碳排放。
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引用次数: 3
comparative study of the modified phyllosilicate group of minerals isoprene for a new nanocomposite preparation 异戊二烯改性层状硅酸盐基矿物制备新型纳米复合材料的比较研究
IF 0.7 Q4 MATERIALS SCIENCE, COMPOSITES Pub Date : 2020-01-01 DOI: 10.14382/epitoanyag-jsbcm.2020.18
Fayq Hsan Jabbar, E. Al-Mulla, W. H. Hoidy
In this study, new nanocomposites of biopolymers were prepared. Sunflower oil synthesized fatty amides (FASF), used as an organic compound to change the natural group of mineral clay phyllosilicate, sodium montmorillonite (NaMMT) and potassium illite (KILT). The clay modification was accomplished by stirring the clay particles in an aqueous (FASF) solution which increases the clay layer distance from 1.28 to 2.79 nm of MMT and 1.18 to 1.33 nm of ILT because the action exchange capacity NaMMT is much greater than the low cation exchange capacity KILT. The improved Na-MMT was then used as a natural rubber (NR) nanocomposite isoprene preparation. The modifier’s interaction in the clay layer was defined by Xray diffraction (XRD). The nanocomposite was synthesized through melt mixing of modified clay (MMT) and NR by a traditional method. Using XRD, transmission electron microscopy (TEM) and thermogravimetric analysis (TGA), the nanocomposite was characterized. The results of XRD and TEM verified nanocomposite growth. Compared to pure NR, NR modified MMT nanocomposites show higher thermal stability. FASF as a vegetable oil derivative to modify clay will reduce dependence on surfactants based on petroleum. Such nanocomposite is considered environmentally friendly in addition to renewable resources.
在本研究中,制备了新的生物聚合物纳米复合材料。葵花籽油合成的脂肪酰胺(FASF),用作改变天然矿物群的有机化合物粘土层状硅酸盐、蒙脱土钠(NaMMT)和伊利石钾(KILT)。由于NaMMT的作用交换容量远大于低阳离子交换容量的KILT,因此通过在水(FASF)溶液中搅拌粘土颗粒来完成粘土改性,使MMT的粘土层距离从1.28 nm增加到2.79 nm, ILT的粘土层距离从1.18 nm增加到1.33 nm。将改进后的Na-MMT用作天然橡胶(NR)纳米复合异戊二烯的制备。用x射线衍射(XRD)测定了改性剂在粘土层中的相互作用。采用传统方法将改性粘土(MMT)与NR熔融混合制备纳米复合材料。采用XRD、透射电镜(TEM)和热重分析(TGA)对复合材料进行了表征。XRD和TEM的结果验证了纳米复合材料的生长。与纯NR相比,NR改性的MMT纳米复合材料具有更高的热稳定性。FASF作为一种植物油衍生物来改性粘土,将减少对基于石油的表面活性剂的依赖。这种纳米复合材料被认为是环境友好的,而且是可再生资源。
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引用次数: 1
Resilient modulus and deviatoric stress of cemented soils treated with crushed waste ceramics (CWC) for pavement subgrade construction 废陶瓷碎石处理水泥土的弹性模量和偏应力
IF 0.7 Q4 MATERIALS SCIENCE, COMPOSITES Pub Date : 2020-01-01 DOI: 10.14382/epitoanyag-jsbcm.2020.14
K. Onyelowe, D. B. Van, Chidozie Ikpa, K. Osinubi, A. Eberemu, A. B. Salahudeen, Oscar C. Nnadi, Moses C. Chima, Jesuborn Obimba Wogu, K. Ibe, B. Ugorji
The behavior of resilient modulus of cemented lateritic soils treated with crushed waste ceramics and utilized as pavement underlain has been investigated under laboratory conditions. This is the measure of the rigidity of soils used as foundation materials. The rampant failures of pavements due to undesirable characteristics exhibited by the foundations have spurred this research work to enable a better understanding of the behavior of soils used as foundation materials and how best they can be handled or treated to ensure stability and durability of the structures. The soils were first characterized and found to belong to A-7, A-7-6, A-7 and A-7-5 group of soils according to the AASHTO classification method. Also, they were found, from basic experiments, to be highly plastic soils with high clay contents. The soils were treated with crushed waste ceramics in the proportion of 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, 110% and 120% by weight of solid with a constant addition of 2.5% by weight ordinary cement. The results of the examination showed that the resilient modulus increased substantially with increased rate of crushed waste ceramics. This showed that crushed ceramic waste is a good pozzolanic material for soils stabilization in the construction of pavement foundations.
在室内试验条件下,研究了废陶瓷破碎处理后的红土胶结土的弹性模量特性。这是对用作地基材料的土壤的刚度的度量。由于地基所表现出的不良特性,路面的严重破坏促使了这项研究工作,以便更好地了解用作地基材料的土壤的行为,以及如何最好地处理或处理它们,以确保结构的稳定性和耐久性。首先根据AASHTO分类方法对土壤进行了表征,发现土壤属于A-7、A-7-6、A-7和A-7-5类群。此外,从基础实验中发现,它们是具有高粘土含量的高塑性土壤。采用固体质量比分别为10%、20%、30%、40%、50%、60%、70%、80%、90%、100%、110%和120%的废陶瓷碎土进行处理,普通水泥质量比为2.5%。试验结果表明,随着废陶瓷破碎率的增加,其弹性模量显著增加。这表明,破碎的陶瓷废料是路面基础施工中稳定土壤的良好火山灰材料。
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引用次数: 5
A lőszermentesítés szerepe az építőiparban
IF 0.7 Q4 MATERIALS SCIENCE, COMPOSITES Pub Date : 2020-01-01 DOI: 10.14382/epitoanyag-jsbcm.2020.9
István Ember
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引用次数: 1
Overview of ash as supplementary cementitious silicate-based composite and construction material 粉煤灰作为硅酸盐基复合材料和建筑材料的补充胶凝研究综述
IF 0.7 Q4 MATERIALS SCIENCE, COMPOSITES Pub Date : 2020-01-01 DOI: 10.14382/epitoanyag-jsbcm.2020.13
K. Onyelowe, F. A. D. Onyelowe, D. B. Van
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引用次数: 8
期刊
Epitoanyag - Journal of Silicate Based and Composite Materials
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