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Electrical Characteristics of Dry Cement – Based Composites Modified with Coconut Husk Ash Nanomaterial 椰壳灰纳米改性干水泥基复合材料的电学特性
IF 1.3 Pub Date : 2022-06-01 DOI: 10.2478/adms-2022-0008
U. Robert, S. Etuk, S. Ekong, O. Agbasi, Nsikak Ekpenyong, Samuel Sunday Akpan, Eme Aniefiok Umana
Abstract Coconut husk is generated yearly as waste in large quantities but majorly under-utilized. Also, as a result of high embodied carbon, cement production is one of the largest contributors to construction sector carbon footprint. Since accumulation of unmanaged agro-waste like coconut husk has an increased environmental concern due to its pollution effect, recycling it into sustainable construction materials is a viable solution for future generation. In this study, experiments were performed to investigate the influence of coconut husk ash nanomaterial (CHAN) inclusion on electrical characteristics of plain cement paste (BCP) and mortar (CSM) samples at curing ages of 7 and 28 days. The results showed increase in electrical resistivity, thermal constant, and activation energy with curing duration for heating and cooling cycles of BCP and CSM. With inclusion of CHAN, the developed cement paste (CAP) and mortar (CASM) possessed lower values in all cases compared to their counterparts. Also, during heating at 28 days, both the CAP and CASM exhibited decrease in thermal constant. Though electrical resistance of all the samples varied inversely with temperature, CAP and CASM were found to possess greater potentials to make building structures intrinsically smart. Hence, in addition to solving disposal problems, utilization of coconut husks as described herein could enhance development of safe, inexpensive, and sustainable buildings that have large temperature sensing volume.
椰子壳每年作为废物大量产生,但主要未得到充分利用。此外,由于高隐含碳,水泥生产是建筑行业碳足迹的最大贡献者之一。由于椰子壳等未经管理的农业废物的积累因其污染效应而引起越来越多的环境问题,因此将其回收利用为可持续建筑材料是下一代的可行解决方案。在本研究中,实验研究了椰子壳灰纳米材料(CHAN)包裹体对养护7天和28天的普通水泥浆(BCP)和砂浆(CSM)样品电特性的影响。结果表明:随着固化时间的延长,BCP和CSM的电阻率、热常数和活化能均有所增加。随着CHAN的加入,开发的水泥浆(CAP)和砂浆(CASM)在所有情况下都具有较低的值。在第28天的加热过程中,CAP和CASM的热常数均呈下降趋势。虽然所有样品的电阻随温度呈反比变化,但CAP和CASM具有更大的潜力,可以使建筑结构具有本质上的智能。因此,除了解决处理问题外,本文所述的椰子壳利用还可以促进安全、廉价和可持续的大感温体积建筑的发展。
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引用次数: 1
Effect of Shop-Primer Coating on S235JR Steel on MAG Weldability S235JR钢车间底漆涂层对MAG可焊性的影响
IF 1.3 Pub Date : 2022-06-01 DOI: 10.2478/adms-2022-0007
Cemil Çetinkaya, Ali Akay, U. Arabaci, U. Özdemir
Abstract In this study, S235JR structural steel samples in uncoated condition and coated (shop-primer) in different thicknesses were welded by MAG (Metal Active Gas) welding method, and the effects of these applications on the mechanical and microstructure properties of the material were investigated. In the experimental studies, the first specimen group were used without any sandblasting and coating application, the second group specimens were sandblasted at Sa 2 ½ degree, and 25 µm, 50 µm, and 75 µm coatings were applied to the specimens in the other group. Surface conditions and coating thicknesses were selected as the variable parameters. With the examination of the radiography films, it was observed that the surface conditions affected the welded joint. As a result of the study, it was observed that altered coating thicknesses caused defects in the welding zone. It was determined that the coating thickness partially affected the mechanical properties, and the highest hardness values occurred in the weld zone in all samples. Relatively low values were obtained in tensile, bending and Charpy impact tests performed on sample groups with 75 µm coating thickness. The results were verified by the surface fracture, SEM, and EDS studies.
摘要:采用MAG (Metal Active Gas)焊接方法,对未涂覆和涂覆不同厚度的S235JR结构钢试样进行了焊接,研究了不同涂覆条件对材料力学性能和显微组织性能的影响。在实验研究中,第一组试样不进行喷砂和涂层处理,第二组试样进行Sa 2.5度喷砂处理,另一组试样分别进行25µm、50µm和75µm涂层处理。选择表面条件和涂层厚度作为可变参数。通过对射线照相底片的检查,可以观察到表面状况对焊接接头的影响。研究结果表明,涂层厚度的改变会导致焊接区出现缺陷。结果表明,涂层厚度对合金的力学性能有一定的影响,且硬度值均出现在焊缝区。在涂层厚度为75µm的样品组上进行的拉伸、弯曲和Charpy冲击试验中获得的数值相对较低。结果通过表面断裂、扫描电镜和能谱分析得到了验证。
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引用次数: 3
Corrosion of Transparent Electrodes Study 透明电极的腐蚀研究
IF 1.3 Pub Date : 2022-06-01 DOI: 10.2478/adms-2022-0005
A. Maged, L. A. M. Nada
Abstract This work reports a study of corrosion lifetime of transparent electrodes deposited on the microscopic glass substrate. A procedure was developed for obtaining the transparent electrode by spray method. The corrosion lifetime variation in the presence of 1.5 M NaOH medium chemically degraded at room temperature before and after gamma irradiation was determined by measuring the evolution of the structure, electrical and optical characteristics. The mean values of transmittance up to 25 month before and after irradiation were calculated 91% ±6% and 96±7%, respectively. The average value of resistivity after corrosion and age time after γ-irradiation was 0.016±9% Ω.cm and 0.017± 4% at 1.0 kHz. No significant changes observed for 27 hr corrosion and 25 month age time of the transparent electrodes in NaOH solution.
摘要本文报道了沉积在微观玻璃基板上的透明电极的腐蚀寿命的研究。提出了一种喷雾法制备透明电极的方法。通过测量结构、电学和光学特性的演变,确定了在室温下化学降解的1.5 M NaOH介质存在前后的腐蚀寿命变化。照射前后25个月的平均透光率分别为91%±6%和96±7%。腐蚀后电阻率和γ辐照时效时间的平均值为0.016±9% Ω。0.017±4%在1.0 kHz。在NaOH溶液中腐蚀27小时和时效25个月,透明电极无明显变化。
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引用次数: 1
Effects of B Addition on the Microstructure and Microhardness of Melt-Spun Al-7075 Alloy 添加B对Al-7075熔纺合金组织和显微硬度的影响
IF 1.3 Pub Date : 2022-06-01 DOI: 10.2478/adms-2022-0004
M. F. Kılıçaslan, Saad Ibrahim Elburni, Yasin Yilmaz, M. Akkaş
Abstract Main aim of this study is to examine change of microstructural and the mechanical properties of Al-7075 alloy depending on B content added with different proportions. Rapid solidification process used to produce the alloys was carried out with a single roll melt spinner via a wheel with a rotational speed of 25 m/s. For the microstructural characterization of the alloys, a scanning electron microscope and X-ray diffraction analyzes were used. According to obtained results, it can be said that B addition led to modification of dimensions and shapes of both α−Al and intermetallic phases occurred, it reduced average grain size from 0.45 μm to 0.34 μm in the microstructure. The B addition also led to dramatically increase in microhardness of the Al-7075 alloy. The microhardness of the alloy with 0.4 wt. % B is 0.19 GPa, this is clearly one times higher than that of the alloy without B addition. The microhardness of the alloy with 1 wt. % B is 0.21 GPa, this is also slightly higher than that of the alloy with 0.4 wt. % B.
摘要本研究的主要目的是研究Al-7075合金的组织和力学性能随添加不同比例B含量的变化。采用单辊熔融纺丝机,通过转速为25 m/s的滚轮进行合金快速凝固。采用扫描电镜和x射线衍射分析对合金进行了显微组织表征。结果表明,B的加入导致了α−Al相和金属间相尺寸和形状的改变,使微观组织的平均晶粒尺寸从0.45 μm减小到0.34 μm。B的加入也显著提高了Al-7075合金的显微硬度。添加0.4 wt. % B的合金显微硬度为0.19 GPa,明显比未添加B的合金高1倍。含1 wt. % B合金的显微硬度为0.21 GPa,也略高于含0.4 wt. % B合金的显微硬度。
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引用次数: 1
Rubber Influence on the Performance of Thermal Insulating Quarry Sand Mortars-A Statistical Analysis 橡胶对采石砂保温砂浆性能影响的统计分析
IF 1.3 Pub Date : 2022-03-01 DOI: 10.2478/adms-2022-0002
Smain Benyamina, Y. Abadou
Abstract The purpose of this paper is to develop a framework for managing wastes resulting from the tire rubber valorization waste of quarry sand mortar. A research methodology was developed to achieve the abovementioned main objective. To create a framework for use of crumb rubber in the production of quarry sand mortars, with adequate physical and mechanical properties to be used in a variety of construction applications. Testing included strength and thermal conductivity properties of the various mixture composition subjected to varying by 5%. 10%. 15% and 20% by quarry sand substitution. The internal microstructure, and phase composition of all mixture mortars, were investigated using scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM/EDS). The results show that increasing incorporation rate of additives significantly improves thermophysical properties of based materials, the hardened properties of the various mortars made are analyzed and compared, the experimental results revealed that; the addition of crumb rubber waste in the quarry sand mortar is beneficial for physical properties (Mv) mass loss, The results of mechanics strength of the rubber based quarry mortar studied are also significantly reduced.The addition of 5% to 20% rubber crumb in matrix and the replacement of sand by 20% of rubber in quarry mortar record the low thermal conductivity properties including that appropriate QS and CR levels may change the pattern of quarry sand mortar. witch explain by a Larger pore and higher porosity produce a less rigid and uniform matrix, meaning that the sonic pulses must travel through longer and more miscellaneous paths which improvement of insulation. The good performance of new materials encourages us to integrate them into the building envelope.
摘要:本文的目的是建立一个框架,以管理由采石场砂砂浆轮胎橡胶增值废物产生的废物。为实现上述主要目标,开发了一种研究方法。为生产采石场砂砂浆中使用的橡胶屑创建一个框架,具有足够的物理和机械性能,可用于各种建筑应用。测试包括强度和导热性能的各种混合物组成受到变化5%。10%。15%和20%由采石场砂替代。采用扫描电子显微镜和能谱仪(SEM/EDS)研究了混合砂浆的内部微观结构和物相组成。结果表明,增加添加剂掺入率可显著改善基材的热物理性能,并对所制砂浆的硬化性能进行了分析和比较,实验结果表明:在采石砂砂浆中加入橡胶废屑有利于其物理性能(Mv)质量损失,所研究的橡胶基采石砂浆的力学强度也明显降低。在基质中加入5% ~ 20%的橡胶屑和在砂浆中用20%的橡胶代替砂石,记录了低导热性能,包括适当的QS和CR水平可以改变砂石砂浆的模式。更大的孔隙率和更高的孔隙率会产生一个不那么坚硬和均匀的矩阵,这意味着声波脉冲必须通过更长的和更复杂的路径,这改善了绝缘。新材料的良好性能促使我们将其融入建筑围护结构中。
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引用次数: 1
Mathematical Model for Friction Stir Lap Welded AA5052 and SS304 Joints and Process Parameters Optimization for High Joint Strength AA5052与SS304搅拌摩擦搭接接头数学模型及高强度接头工艺参数优化
IF 1.3 Pub Date : 2022-03-01 DOI: 10.2478/adms-2022-0001
Veerendra Chitturi, S. R. Pedapati, M. Awang
Abstract Due to the numerous challenges faced during the dissimilar welding, choosing the right process parameters and their optimization yields better results. In this context, the current investigation is focused on the optimization of process parameters. Taguchi’s L9 orthogonal array was selected to carry out the experimental investigations. The welded samples were tested for shear strength, and the results were analysed using Taguchi’s S/N ratio analysis with “larger the better” criteria. Log-linear regression analysis was applied to formulate an empirical correlation between the process parameters and shear strength. According to S/N ratio analysis, the tool rotational speed of 800 rpm, welding speed of 20 mm/min and a penetration depth of 4.1 mm are the optimized parameters that achieve high joint strength. The achieved joint strength was 3.46 kN that is 70% of the base aluminium metal. It was noticed from the Analysis of variance of the regression model that penetration depth and tool rotational speed are the significant contributors with p-values less than 0.5. Confirmation tests show that the error between the predicted and calculated shear strength is 2.06% which is considered acceptable. R2 and adjusted R2 values of the model with a standard error of 0.076 show that the developed model is statistically significant.
由于异种焊接面临诸多挑战,选择正确的工艺参数并对其进行优化可以获得较好的效果。在此背景下,目前的研究重点是工艺参数的优化。采用田口L9正交阵列进行实验研究。对焊接试样进行抗剪强度测试,并采用“越大越好”的田口信噪比分析方法对结果进行分析。采用对数线性回归分析,建立了工艺参数与抗剪强度之间的经验相关性。根据信噪比分析,刀具转速为800 rpm,焊接速度为20 mm/min,焊深为4.1 mm是获得高接头强度的优化参数。得到的接头强度为3.46 kN,为母材的70%。从回归模型的方差分析中可以看出,穿透深度和刀具转速是显著的影响因素,p值小于0.5。验证试验表明,预测抗剪强度与计算抗剪强度误差为2.06%,可以接受。模型的R2和调整后的R2值的标准误差为0.076,表明所建立的模型具有统计学意义。
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引用次数: 3
NiO/CuO/TiO2 Ternary Composites: Development, Physicochemical Characterization and Photocatalytic Degradation Study Over Reactive Orange 30 Solutions Under Solar Light Irradiation NiO/CuO/TiO2三元复合材料的制备、物理化学表征及太阳光照下活性橙30溶液的光催化降解研究
IF 1.3 Pub Date : 2022-03-01 DOI: 10.2478/adms-2022-0003
A. Muthamilarasu, S. Sivakumar, G. Divya, M. Sivakumar, D. Sakthi
Abstract The photocatalytic degradation and mineralization of Reactive Orange 30 on NiO/CuO/TiO2 ternary composites have been studied using solar light irradiation. The NiO/CuO/TiO2 ternary composites were prepared by producing ethanolic dispersions containing varied amounts of NiO and CuO/TiO2 (3wt% to 15wt.%), followed by annealing at 300 °C. SEM, UV- Vis DRS, PL, XRD and FTIR analysis have been used to characterize the unary (parent photocatalysts), binary and ternary composites. Under solar light irradiation, NiO/CuO/TiO2 ternary composites exhibited an excellent photocatalytic activity in degradation of reactive orange 30 in aqueous solution, whereas the NiO/TiO2, CuO/TiO2 and bare photocatalyst such as NiO, CuO, TiO2 showed lower activities. It was deduced that the remarkable visible-light absorption phenomenon and band gap reduction of the NiO/CuO/TiO2 ternary composites taking place. It paves way for the photogenerated electron transfer between CB of the NiO, CuO, TiO2 semiconductors and also holes shifting between VB of above mentioned materials. The NiO/CuO/TiO2 ternary composite shows good photostability and the photocatalyst retains 94% of its initial activity in the seventh cycle, respectively.
摘要研究了太阳光照下活性橙30在NiO/CuO/TiO2三元复合材料上的光催化降解和矿化。通过制备含有不同数量的NiO和CuO/TiO2 (3wt% ~ 15wt %)的乙醇分散体,在300℃下退火,制备了NiO/CuO/TiO2三元复合材料。利用SEM、UV- Vis DRS、PL、XRD和FTIR等分析手段对复合材料进行了表征。在太阳光照射下,NiO/CuO/TiO2三元复合材料对水中活性橙30的降解表现出优异的光催化活性,而NiO/TiO2、CuO/TiO2以及NiO、CuO、TiO2等裸光催化剂的降解活性较低。结果表明,NiO/CuO/TiO2三元复合材料出现了明显的可见光吸收现象和带隙减小。这为NiO, CuO, TiO2半导体的CB之间的光生电子转移以及上述材料的VB之间的空穴转移铺平了道路。NiO/CuO/TiO2三元复合材料表现出良好的光稳定性,光催化剂在第七次循环中分别保持了94%的初始活性。
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引用次数: 0
Research Progress of Composite Materials of NiTi SMA and Stainless Steel NiTi SMA与不锈钢复合材料的研究进展
IF 1.3 Pub Date : 2022-01-01 DOI: 10.11648/j.am.20221101.12
H. Zeng, Jianping Zhou, Yan Zhang
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引用次数: 1
Studies on Synthesis and Electrochemical Properties of Lithium Ferrous Silicate Cathode Materials 硅酸亚铁锂正极材料的合成及电化学性能研究
IF 1.3 Pub Date : 2022-01-01 DOI: 10.11648/j.am.20221101.13
W. Qingsheng, P. Novikov, Anadoli Popovich, Yang Zhelong, Yu-hong Yao, Okonov Leonid
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引用次数: 0
Mechanical, Thermal and Hydric Behavior of the Bio-sourced Compressed Earth Block (B-CEB) Added to Peanut Shells Powder 花生壳粉中添加生物源压缩土块(B-CEB)的力学、热、水行为
IF 1.3 Pub Date : 2022-01-01 DOI: 10.11648/j.am.20221101.11
Nassio Sory, Moussa Ouedraogo, A. Messan, Issiaka Sanou, Moustapha Sawadogo, Kouka Jeremy Ouedraogo, Halidou Bamogo, Ouanmini Bobet, L. Zerbo, M. Seynou
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引用次数: 2
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