دانلود رایگان مقاله لاتین سرباره توپر ملات سیمان از سایت الزویر
عنوان فارسی مقاله:
بررسی خواص الکترومغناطیسی و جذب مایکروویو مس سرباره توپر ملات سیمان
عنوان انگلیسی مقاله:
Investigation on electromagnetic and microwave absorption properties of copper slag-filled cement mortar
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Nowadays, the EM environment pollution has been paid more and more attentions [1,2]. EM waves may interfere with electrical equipments. In addition, the different EM radiations do harms on human health [3,4]. It is urgently required for the microwave absorbers, which can attenuate the radiation energy. The microwave with 8.2e12.4 GHz frequency bands and 3.75e2.4 cm wave length is usually used in high frequency communication devices [5]. Therefore, it is particularly needed for microwave absorbers within this frequency bands to prevent approximately EM interference of the devices [6]. Cement based composites are widely used as structural materials. However, their microwave absorbing ability and electrical conductivity are very weak. Although some researchers use carbon fibers to reinforce cement based composites and to improve their mechanical properties and microwave absorbing ability [7e15], the cost of the composites is enhanced enormously. Therefore, it is urgent to find out materials with better electrical or magnetic conductivity and lower price to substitute carbon fibers in cement based composites. The effective way to improve the EM absorbing performance is the use of high magnetic or conductive materials [16,17]. Copper slag is a by-product obtained by copper smelting [18]. Production of one ton of copper produces about three tons of copper slag [19]. However, copper slag is endowed with outstanding mechanical properties and can be used in concrete as a substitute for fine aggregates [20]. On the other hand, the copper slag can reduce the mixing water content and is used to produce high-strength concrete [21]. In addition, the study of Gon, et al. also ~ shows that the copper slag can improve the durability of the hardened Portland cement pastes by enhancing mechanical property of the pastes [22]. Therefore, copper slag is a kind ofsustainable and useful materials for cement based composites applications [23]. However, despite the promising facts [24e28], further investigations are greatly urgent in order to produce copper slag/ cement based materials with microwave absorption function. Therefore, this study aims to investigate the feasibility of using copper slag as substitute for natural sand in improving the EM absorbing performance of ordinary cement mortar. Four different volume percentages of copper slag were used to study the effects of copper slag content on the permittivity, permeability and microwave reflectivity of cement mortar. The primary scope of this study is to interpret how copper slag affects the EM performance to put forward theoretical basis for improving microwave resistivity of the ordinary cement mortar in EM shielding engineering.
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کلمات کلیدی:
Investigation on electromagnetic and microwave absorption properties ... isi-dl.com/item/139302 Investigation on electromagnetic and microwave absorption properties of copper slag-filled cement mortar. sciencedirect.com ... Studies on use of Copper Slag as Replacement Material for River ... link.springer.com/article/10.1007/s40030-014-0084-9 by CK Madheswaran - 2014 - Cited by 9 - Related articles Aug 20, 2014 - Cement mortar mixtures prepared with fine aggregate made up of different proportions of copper slag and sand were tested for use as masonry ... Use of waste copper slag, a sustainable material | SpringerLink link.springer.com/article/10.1007/s10163-014-0254-x by K Murari - 2015 - Cited by 12 - Related articles May 3, 2014 - The waste copper slag can be used as abrasive tools, road ... cement, mortar, and concrete as mixed with lime stone powder, dust, cement ... The use of copper slag in cement and concrete provides potential ..... Properties of waste copper slag ... The absorption of the material is typically very low (0.13 %). Investigation on electromagnetic and microwave absorption properties ... https://www.infona.pl/.../bwmeta1.element.elsevier-e300600f-1a3a-30c3-8c03-ca9f6a... by Z Wang - 2016 - Related articles The reflectivity values of the copper slag-filled mortars tend to decrease and then ... and microwave absorption properties of copper slag-filled cement mortar. [PDF]Study on the Effect of Copper Slag Admixtures to Properties and ... docsdrive.com/pdfs/ansinet/itj/2013/7396-7400.pdf by S Jun-wei - 2013 - Cited by 2 - Related articles materials is filling effect, activity effect and acceleration effect. The filling effect ... Key words: Concrete, copper slag, macroscopic properties, microscopic structure, hydration process. INT RODUC .... slag has a higher water absorption and less unit weight compared ... ultra high strength, high wear resistance of cement mortar. Cement mixtures containing copper tailings as an additive: durability ... www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392012000600029 by O Onuaguluchi - 2012 - Cited by 10 - Related articles The effects of copper tailings as an additive, on some durability properties of ... Keywords: copper tailings, concrete, water absorption, durability and chloride penetration ... mortar and concrete mixtures in this study were Portland slag cement CEM .... Samples were placed in the center of two test cells; the cell filled with 3.0% ...
