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Recovery of pure silver from spent silver electroplating solutions via electrochemical process and zinc cementation 用电化学法和锌胶结法从电镀废银液中回收纯银
IF 0.9 Q3 Materials Science Pub Date : 2023-03-28 DOI: 10.55713/jmmm.v33i1.1576
T. Patcharawit, C. Kansomket, Woranittha Kritsarikun, Ketmanee Taseela, Chonthicha Paernaphan, Thiwavan Laphosin, Teerawut Tannukit, S. Khumkoa
Recycling of spent silver electroplating solutions has been investigated via electrowinning and electrorefining in comparison to zinc cementation technique in this research. Two different compositions of transparent and dark waste solutions were used having the remaining silver contents of 17.71 g⸳L-1 and 33.36 g⸳L-1 respectively. The waste solutions were used as an electrolyte in the first step of electrowinning at low current density of 0.015 A⸳cm-2. It was found that increasing electrowinning time from 4 h to 24 h increased the recovery of silver cathode for both types of waste solutions. The optimum electrowinning time was higher than 8 h, giving the recovery of higher than 97.5% and 98.5% purity for 24 h electrowinning. Through the subsequent electrorefining, the electrowon silver cathode was set as the anode, while HNO3 + AgNO3 electrolyte containing high silver content of 120 g Ag/L was used. By controlling the potential at 0.8 V, silver crystal of high purity > 99.9% was obtained. The highest recovery was 99.11% when using silver cathode obtained from electrowinning of the transparent waste solution. Zinc cementation however led to loss of silver in the precipitate form on the zinc metal surface, giving only 86.16% recovery.
本研究采用电积法和电精炼法对电镀废银溶液的回收进行了研究,并与锌胶结法进行了比较。采用两种不同组成的透明废液和深色废液,其剩余银含量分别为17.71 g⸳L-1和33.36 g⸳L-1。在0.015 A⸳cm-2的低电流密度下,废液被用作电积第一步的电解质。结果表明,将电积时间从4 h增加到24 h,两种废溶液的银阴极回收率均有所提高。最佳电积时间大于8 h, 24 h电积回收率分别大于97.5%和98.5%。通过后续的电精炼,以电原银阴极为阳极,采用高银含量120 g Ag/L的HNO3 + AgNO3电解液。将电位控制在0.8 V,可获得纯度> 99.9%的高银晶体。采用透明废液电积所得银阴极,回收率最高达99.11%。锌胶结导致银以沉淀形式损失在锌金属表面,回收率仅为86.16%。
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引用次数: 0
Wear behavior of in-situ oxide dispersion strengthened Fe-8Ni alloy with Zr additions 添加Zr的原位氧化物弥散强化Fe-8Ni合金的磨损行为
IF 0.9 Q3 Materials Science Pub Date : 2023-03-28 DOI: 10.55713/jmmm.v33i1.1568
Mustafa Tekin, F. Muhaffel, H. Kotan, Murat Çağlar Baydoğan
In this study, in-situ oxide dispersion strengthened (ODS) Fe91Ni8Zr1 and Fe88Ni8Zr4 alloys were produced by combination of high energy mechanical alloying (HEMA) and high temperature equal channel angular extrusion (HT-ECAE). The wear behaviors of the consolidated samples were investigated under different loads from 1 N to 4 N by reciprocating wear tests at room temperature. The Scanning electron microscopy (SEM) was used to examine the wear tracks to analyze the wear characteristics as a function of applied loads. The relative comparison of the wear results showed that under the lower loads of 1 N and 2 N, Fe88Ni8Zr4 alloy has lower wear rate than Fe91Ni8Zr1 alloy whereas under the higher loads of 3 N and 4 N, it is vice versa. Additionally, the friction coefficient of Fe91Ni8Zr1 alloy was found to be lower than that of Fe88Ni8Zr4 alloy under all the applied loads. The results were comparatively discussed with respect to microstructural features of 1 at% Zr and 4 at% Zr containing ODS alloys produced by HEMA followed by ECAE. The obtained results of ODS alloys with different grain size, precipitate size, and number density of the precipitates, may disclose a new sight for using such alloys in wear applications just as cutting tools, turbine blades, and discs.
采用高能机械合金化(HEMA)和高温等通道角挤压(HT-ECAE)相结合的方法制备了原位氧化物弥散强化(ODS) Fe91Ni8Zr1和Fe88Ni8Zr4合金。通过室温往复磨损试验,研究了固结试样在1 ~ 4 N不同载荷作用下的磨损行为。利用扫描电子显微镜(SEM)对磨损轨迹进行观察,分析磨损特性随外加载荷的变化规律。对比磨损结果表明,在较低的1N和2 N载荷下,Fe88Ni8Zr4合金的磨损率低于Fe91Ni8Zr1合金,而在较高的3 N和4 N载荷下,Fe91Ni8Zr1合金的磨损率相反。此外,在所有载荷作用下,Fe91Ni8Zr1合金的摩擦系数都低于Fe88Ni8Zr4合金。对比讨论了HEMA - ECAE法制备1 at% Zr和4 at% Zr ODS合金的显微组织特征。所获得的具有不同晶粒尺寸、析出相尺寸和析出相数量密度的ODS合金的结果,可能揭示了在刀具、涡轮叶片和圆盘等磨损应用中使用此类合金的新视野。
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引用次数: 0
Preparation of spent coffee grounds-rubber composites using natural rubber latex as binder 以天然胶乳为粘合剂制备咖啡渣-橡胶复合材料
IF 0.9 Q3 Materials Science Pub Date : 2022-12-26 DOI: 10.55713/jmmm.v32i4.1543
Varittha Mitsaichon, Kanok-on RUAESRIJAN1, P. Phinyocheep, T. Amornsakchai, P. Junkong, S. Thanawan
The aim of this work was to explore the use of natural rubber latex (NRL) as a natural binder (according to the BCG concept) to replace commercial synthetic binders such as polyurethane resin. A composite sheet of spent coffee ground (SCG) and natural rubber (NR) was prepared by mixing of SCG in NRL compounds having concentrations of 30% and 60% dry rubber content (DRC). The amount of SCG in the composites was varied from 33 to 167 part per hundred rubber (phr). The mixture was cast in a mold to form a thin sheet then left drying at room temperature for 24 h. TGA thermogram shows 3 decomposition stages composed of moisture (including volatile matters), polysaccharide and lipid at 44%, 42% and 13% weight, respectively. Hardness (Shore A) increases gradually with increasing the amount of SCG, while tensile strength and elongation at break tend to decrease. Tensile strength decreases from 2.6 MPa to 1.2 MPa for the composites containing 33 phr and 133 phr of SCG, respectively. Alkaline surface treatment of SCG could improve the adhesion between SCG and NR as evidenced by the increase in tensile strength, elongation at break and compression set properties.
这项工作的目的是探索使用天然胶乳(NRL)作为天然粘合剂(根据BCG的概念)来取代商业合成粘合剂,如聚氨酯树脂。将废咖啡渣(SCG)与天然橡胶(NR)混合,制备了废咖啡渣(SCG)与天然橡胶(NR)的复合片材。复合材料中SCG的含量从33到167 /百橡胶(phr)不等。将混合物在模具中浇铸成薄片,室温干燥24 h。TGA热像图显示出3个分解阶段,分别由水分(含挥发物)、多糖和脂质在44%、42%和13%重量下组成。随着SCG用量的增加,硬度(邵氏A)逐渐升高,而抗拉强度和断裂伸长率有降低的趋势。当SCG含量为33 phr和133 phr时,复合材料的抗拉强度从2.6 MPa降至1.2 MPa。碱性表面处理可以改善SCG与NR的粘结性,提高SCG的抗拉强度、断裂伸长率和压缩凝固性能。
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引用次数: 0
Mineralogical studies and optimization of tabling parameters of low grade chromite ore by box behnken design of experiments 采用箱式试验设计对低品位铬铁矿进行矿物学研究及选矿参数优化
IF 0.9 Q3 Materials Science Pub Date : 2022-12-26 DOI: 10.55713/jmmm.v32i4.1563
Amit Kumar Bhandary, S. Mukherjee, R. Dey, M. Chaudhuri
Chromite ore is geologically associated with gangue materials which have lower density compared to pure chromite (FeO.Cr2O3). Gravity separation techniques are very suitable for beneficiation of low grade chromite ore. In the present study mineralogical analysis of the sample has been carried out by using Wavelength dispersive x-ray fluorescence (WDXRF), X-ray powder diffraction (XRD), Scanning electron microscopy (SEM) and Energy dispersive X-ray (EDX). The beneficiation of low grade (Cr2O3% 26.88) chromite ore has been investigated using wilfley table. Optimization has been carried out using box-behnken statistical design (BBD). The experimental parameters selected are: tilt angle, water flow rate and pre-heat treatment of the chromite ore. It is observed that percentage recovery of Cr2O3 depends upon tilt angle, water flow rate and pre-heat treatment of chromite ore. Pre-heat treatment of chromite ore plays a vital role in gravity separation. The optimized tabling conditions suggested by BBD are 8° tilt angle, 4 L∙min-1 water flow rate and temperature for pre-heat treatment of raw chromite ore at 443.72℃. After tabling under optimized conditions, chromite concentrate contained 1.91 Cr/Fe ratio, 46.02% of Cr2O3 with 65.95% recovery.
与纯铬铁矿(FeO.Cr2O3)相比,铬铁矿具有较低密度的脉石物质。重选技术非常适合于低品位铬铁矿的选矿。本研究采用波长色散x射线荧光(WDXRF)、x射线粉末衍射(XRD)、扫描电镜(SEM)和能量色散x射线(EDX)对样品进行了矿物学分析。采用威立试验台对某低品位(cr2o3 - 26.88)铬铁矿进行了选矿试验。采用盒本肯统计设计(BBD)进行了优化。实验选取的参数为:倾斜角度、水流速度和铬铁矿的预热处理,观察到Cr2O3的回收率与倾斜角度、水流速度和铬铁矿的预热处理有关,而铬铁矿的预热处理在重选过程中起着至关重要的作用。BBD提出的最佳制浆条件为:倾斜角度为8°,水流量为4 L∙min-1,预处理温度为443.72℃。经优化后的铁精矿的Cr/Fe比为1.91,Cr2O3含量为46.02%,回收率为65.95%。
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引用次数: 0
The effects of double intercritical annealing on microstructure and mechanical properties of 0.107C-2.39Mn-0.453Si dual phase steel 双临界间退火对0.107C-2.39Mn-0.453Si双相钢组织和力学性能的影响
IF 0.9 Q3 Materials Science Pub Date : 2022-12-26 DOI: 10.55713/jmmm.v32i4.1537
N. Saenarjhan, G. Lothongkum, J. Opapaiboon
                In this study, double intercritical annealing was applied to modify the mechanical properties of 0.107%C-2.39%Mn-0.453%Si dual phase steel. The effects of the double intercritical annealing (DIA) method were investigated via microstructure observation and tensile test, and then compared with the single intercritical annealing (SIA) method. By increasing the intercritical annealing temperature, yield and tensile strengths increase while ductility decreases primarily due to the increase of martensite fraction. DIA leads to a slight reduction of the ferrite size and the martensite fraction regardless of the intercritical annealing temperature. Tensile results showed that DIA increases ductility without losing significant amount of strength. The outcome implies that the DIA method can be used to modify the mechanical properties of DP steels without adding excessive complexity to the process.
采用双临界间退火技术对0.107%C-2.39%Mn-0.453%Si双相钢的力学性能进行了改善。通过显微组织观察和拉伸试验研究了双临界间退火(DIA)方法的效果,并与单临界间退火(SIA)方法进行了比较。随着临界间退火温度的升高,屈服强度和抗拉强度增加,而延展性降低主要是由于马氏体分数的增加。与临界间退火温度无关,DIA导致铁素体尺寸和马氏体分数略有降低。拉伸结果表明,DIA在不损失大量强度的情况下增加了延展性。结果表明,DIA方法可以在不增加工艺复杂性的情况下改善DP钢的力学性能。
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引用次数: 0
Green acidic catalyst from cellulose extracted from sugarcane bagasse through pretreatment by electron beam irradiation and subsequent sulfonation for sugar production 从甘蔗渣中提取纤维素,经电子束辐照预处理后磺化制备制糖用绿色酸性催化剂
IF 0.9 Q3 Materials Science Pub Date : 2022-12-26 DOI: 10.55713/jmmm.v32i4.1540
T. Rattanawongwiboon, Prim Chanklinhorm, Threeraphat Chutimasakul, T. Kwamman, Wilasinee Kingkam, Rattapon Khamlue, S. Ummartyotin
The objective of this research is to prepare a green acidic catalyst from cellulose derived from sugarcane bagasse (SB). Initially, SB was pretreated by electron beam irradiation with a dose of 50 kGy to 200 kGy and subsequent acid hydrolysis to obtain cellulose. The cellulose derived from SB was carbonized at different temperatures for 4 h and then sulfonated with heating at 120°C under reflux. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used to confirm the successful preparation of acidic catalyst by irradiation pretreatment and subsequent sulfonation. The cellulose derived from irradiated SB at the lowest dose of 50 kGy was used as a representative irradiated sample for comparison with non-irradiation. Scanning electron microscope image of sulfonated biochar was observed pores with various sizes. The existence of sulfur atom onto sulfonated biochar surface was investigated by Energy dispersive X-ray spectroscopy. After sugar production by sulfonated biochar as an acidic catalyst, the total sugar content was measured by a phenol-sulfuric acid method using a UV-Vis spectrophotometer. The total sugar with 94.51 ± 1.35% content was found when the acidic catalyst was performed. It was remarkable to note that sulfonated biochar prepared from cellulose derived from SB after pretreatment and sulfonation exhibited outstanding result for being as an acidic catalyst for sugar production.
本研究以甘蔗渣纤维素为原料制备绿色酸性催化剂。最初,SB采用50 ~ 200 kGy剂量的电子束辐照预处理,然后进行酸水解得到纤维素。将SB提取的纤维素在不同温度下碳化4 h,然后在回流下120℃加热磺化。利用傅里叶变换红外光谱(FTIR)和x射线衍射(XRD)证实了通过辐照预处理和后续磺化制备酸性催化剂的成功。以最低剂量50 kGy辐照SB所得纤维素作为代表性辐照样品,与未辐照样品进行比较。扫描电镜观察到磺化生物炭具有不同大小的孔隙。采用能量色散x射线能谱法研究了磺化生物炭表面硫原子的存在性。以磺化生物炭为酸性催化剂制糖后,采用紫外-可见分光光度计,用苯酚-硫酸法测定总糖含量。在酸性催化剂作用下,总糖含量为94.51±1.35%。值得注意的是,以SB为原料的纤维素经预处理和磺化制备的磺化生物炭在作为酸性催化剂产糖方面表现出了显著的效果。
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引用次数: 0
Development of FexOy particle onto bacterial cellulose network by forced hydrolysis and its electrical conductivity FexOy颗粒在细菌纤维素网络上的强制水解及其导电性
IF 0.9 Q3 Materials Science Pub Date : 2022-12-26 DOI: 10.55713/jmmm.v32i4.1530
Prompong Khamwongsa, P. Wongjom, Andi Magattang Gafur Muchlisc, Chun Che Lin, Seranee Srisuk, S. Ummartyotin
FexOy particle and bacterial cellulose composite sheet was successfully prepared by forced hydrolysis. The presence of Fe3+ ions in bacterial cellulose suspension significantly provided the positive charge due to electrostatic force as reported by Zeta potential. With the pH of 12 of bacterial cellulose suspension, particle was nucleated between bacterial cellulose networks. Fourier transform infrared exhibited Fe-O stretching. X-ray diffraction reported that the mixture of Fe2O3 and Fe3O4 was existed onto bacterial cellulose composite. Scanning electron microscope reported that FexOy particle was randomly distributed in bacterial cellulose network. Intensity of Fe was qualitatively observed by energy dispersive analysis. With the existence of FexOy particle, the composite illustrated the inferiority of thermal stability of 150℃. Furthermore, it was noted that the resistivity was reduced with respect to increment of FexOy particle, suggesting that electrical conductivity was then enhanced. It was remarkable to note that FexOy particle and bacterial cellulose composite sheet prepared from forced hydrolysis showed the excellent properties as a candidate for flexible electrode.
采用强制水解法制备了FexOy颗粒与细菌纤维素复合片材。细菌纤维素悬浮液中Fe3+离子的存在显著地提供了由于静电力引起的正电荷,正如Zeta电位所报道的那样。细菌纤维素悬浮液的pH值为12时,颗粒在细菌纤维素网络之间成核。傅里叶变换红外表现出Fe-O拉伸。x射线衍射结果表明,细菌纤维素复合材料表面存在Fe2O3和Fe3O4的混合物。扫描电镜观察发现,FexOy颗粒在细菌纤维素网络中呈随机分布。通过能量色散分析定性地观察了铁的强度。由于FexOy颗粒的存在,复合材料在150℃时的热稳定性较差。此外,电阻率随FexOy颗粒的增加而降低,表明电导率随之提高。值得注意的是,通过强制水解制备的FexOy颗粒和细菌纤维素复合片作为柔性电极的候选材料表现出优异的性能。
{"title":"Development of FexOy particle onto bacterial cellulose network by forced hydrolysis and its electrical conductivity","authors":"Prompong Khamwongsa, P. Wongjom, Andi Magattang Gafur Muchlisc, Chun Che Lin, Seranee Srisuk, S. Ummartyotin","doi":"10.55713/jmmm.v32i4.1530","DOIUrl":"https://doi.org/10.55713/jmmm.v32i4.1530","url":null,"abstract":"FexOy particle and bacterial cellulose composite sheet was successfully prepared by forced hydrolysis. The presence of Fe3+ ions in bacterial cellulose suspension significantly provided the positive charge due to electrostatic force as reported by Zeta potential. With the pH of 12 of bacterial cellulose suspension, particle was nucleated between bacterial cellulose networks. Fourier transform infrared exhibited Fe-O stretching. X-ray diffraction reported that the mixture of Fe2O3 and Fe3O4 was existed onto bacterial cellulose composite. Scanning electron microscope reported that FexOy particle was randomly distributed in bacterial cellulose network. Intensity of Fe was qualitatively observed by energy dispersive analysis. With the existence of FexOy particle, the composite illustrated the inferiority of thermal stability of 150℃. Furthermore, it was noted that the resistivity was reduced with respect to increment of FexOy particle, suggesting that electrical conductivity was then enhanced. It was remarkable to note that FexOy particle and bacterial cellulose composite sheet prepared from forced hydrolysis showed the excellent properties as a candidate for flexible electrode.","PeriodicalId":16459,"journal":{"name":"Journal of metals, materials and minerals","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83213242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research progress of novel zirconium alloys with high strength and toughness 新型高强韧锆合金的研究进展
IF 0.9 Q3 Materials Science Pub Date : 2022-12-26 DOI: 10.55713/jmmm.v32i4.1526
Nanxin Zhang, C. Xia, J. Qin, Qiang Li, Xinyu Zhang, Riping Liu
Atoms of zirconium (Zr) are often known as "first metals of the atomic age". Because of its low cross section for thermal neutron absorption, excellent corrosion resistance, and good mechanical and processing properties, it is extensively used in the nuclear industry. As the properties requirements of materials in chemical, medical and aerospace fields turn out to be higher, the application of Zr alloys in these non-nuclear fields has become more and more widespread due to their excellent properties. In addition to having a high melting point, Zr alloys also have a high specific strength and low thermal expansion coefficient. Therefore, Zr alloys have a very promising application in corrosion-resistant structural materials. This paper mainly introduces the development status of Zr alloys, the design and optimization of Zr alloy compositions, the mechanism of Zr alloy toughening and the prospects of Zr alloy applications in various fields.
锆原子(Zr)通常被称为“原子时代的第一金属”。由于其热中子吸收截面低,耐腐蚀性好,机械性能和加工性能好,在核工业中得到广泛应用。随着化工、医疗、航空航天等领域对材料性能要求的提高,Zr合金以其优异的性能在这些非核领域的应用越来越广泛。除了具有高熔点外,Zr合金还具有高比强度和低热膨胀系数。因此,Zr合金在耐腐蚀结构材料中具有很好的应用前景。本文主要介绍了Zr合金的发展现状、Zr合金成分的设计与优化、Zr合金的增韧机理以及Zr合金在各个领域的应用前景。
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引用次数: 1
Sugarcane waste-derived activated carbon for lithium-sulfur batteries with enhanced performance by thiourea doping 硫脲掺杂提高锂硫电池性能的甘蔗废活性炭
IF 0.9 Q3 Materials Science Pub Date : 2022-12-26 DOI: 10.55713/jmmm.v32i4.1542
Yanisa Thumkaew, Vipada Petson, Thanapat Jorn-am, Natee Sirisit, Chalathorn Chanthad, J. Manyam, Xiao Liang, Shufeng Song, P. Paoprasert
In this work, bio-renewable sugarcane bagasse and leaf were utilized for the preparation of activated carbon (BAC and LAC), which was then employed as the host material in lithium-sulfur (Li-S) batteries. The activated carbon, for the first time, was doped with nitrogen and sulfur via the addition of thiourea during the synthesis of carbon char via a simple, one-step hydrothermal method. The activated carbon was used to fabricate the cathodes of the CR2032 coin cells. The amount of added thiourea was found to influence the nitrogen/sulfur content, porosity, amorphous/graphitic structure, and performance of the activated carbon.  At 0.2C, BAC2 (4.15 wt% thiourea doping) gave the highest specific capacity of 478 mAh⸳g-1 among the bagasse-derived activated carbon, while LAC3 (8.3 wt% thiourea doping) yielded the highest specific capacity of 521 mAh⸳g-1 among the leaf-derived activated carbon. They also demonstrated an excellent capacity retention of 72% and 83%, respectively, after 100 cycles. Furthermore, thiourea doping also improved the rate performance, by providing fast interfacial processes. Based on these results, the obtained activated carbon demonstrates the potential for the fabrication of high-performance Li-S batteries. Also, this work highlights the practical utilization of both sugarcane wastes for these emerging energy storage devices.
本研究以生物可再生蔗渣和蔗叶为原料制备活性炭(BAC和LAC),并将其作为锂硫电池(li -硫)的主体材料。在简单的一步水热法合成炭炭的过程中,首次通过添加硫脲对活性炭进行氮和硫的掺杂。该活性炭用于制备CR2032硬币电池的阴极。硫脲的加入量影响了活性炭的氮/硫含量、孔隙率、非晶/石墨结构和性能。在0.2C时,BAC2(掺杂4.15 wt%硫脲)的比容量最高,为478 mAh⸳g-1,而LAC3(掺杂8.3 wt%硫脲)的比容量最高,为521 mAh⸳g-1。经过100次循环后,它们的容量保持率分别为72%和83%。此外,硫脲掺杂还通过提供快速的界面过程提高了速率性能。基于这些结果,所获得的活性炭显示了制造高性能锂电池的潜力。此外,这项工作强调了这两种甘蔗废料在这些新兴储能装置中的实际利用。
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引用次数: 1
Effect of pore modifiers on physical and mechanical properties of high-performance cement mortar 孔隙改性剂对高性能水泥砂浆物理力学性能的影响
IF 0.9 Q3 Materials Science Pub Date : 2022-12-26 DOI: 10.55713/jmmm.v32i4.1536
Kisun Chunti, S. Polsilapa, Parinya Chakartnarodome, P. Sonprasarn, W. Prakaypan, E. Laitila
                Two different pore modifiers (PM), artificial pozzolan (AP) and modified aluminum salt (MA), were introduced into the composition of a High Performance Cement Mortar (HPCM). The chemical compositions of raw materials, ordinary Portland cement (OPC), sea sand, AP, and MA were identified by X-Ray Fluorescence spectrometry (XRF). The hydration kinetics resulting from each PM added to the HPCM was investigated by the relevance of hydration temperature. The mechanical properties such as compressive strength, dynamic modulus of rupture, and dynamic modulus of elasticity were measured as well as water absorption and density. Additionally, Scanning Electron Microscope (SEM) and Brunauer-Emmett-Teller (BET) were used to reveal the beneficial effects of appropriate PM through the microstructure, pore size distribution and specific surface area. Experimental results showed that the PM increased the hydration temperature, resulting in the generation of stress at early stages throughout the HPCM structure. This stress caused the formation of micropores, which increased water absorption, decreased density, and enhanced the structural integrity 
将人工火山灰(AP)和改性铝盐(MA)两种不同的孔隙改性剂(PM)引入到高性能水泥砂浆(HPCM)的组成中。采用x射线荧光光谱法(XRF)对原料普通硅酸盐水泥(OPC)、海砂、AP和MA的化学成分进行了鉴定。通过水化温度的相关性研究了各PM加入HPCM的水化动力学。测定了材料的抗压强度、动态断裂模量、动态弹性模量、吸水率和密度等力学性能。此外,通过扫描电镜(SEM)和布鲁诺尔-埃米特-泰勒(BET)分析,从微观结构、孔径分布和比表面积等方面揭示了适量PM的有益作用。实验结果表明,PM提高了水化温度,导致应力在整个HPCM结构的早期阶段产生。这种应力导致微孔的形成,增加了吸水率,降低了密度,增强了结构的完整性
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引用次数: 0
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Journal of metals, materials and minerals
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