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  • 1.
    Altaie, Entidhar
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Al-Ansari, Nadhir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Knutsson, Sven
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Progress of building materials and foundation engineering in ancient Iraq2012In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, p. 220-241Article in journal (Refereed)
    Abstract [en]

    Humans realised the importance of housing since the dawn of history. The first man used the caves as shelter. When agricultural activities dominated the life style of humans, villages started to be constructed. Later these were developed into cities. The dawn of civilization started in Iraq. The inhabitants in that time used the available natural materials in their construction. Reviewing the progress of engineering practices of ancient Iraq, reveals the facts that the inhabitants were aware of the principles of construction and engineering. The materials used and the design of the buildings were very suitable from both environmental and engineering perspectives. This work is a critical review of the progress and development of engineering practices and construction materials used in ancient Mesopotamia

  • 2.
    Cwirzen, Andrzej
    Department of Civil and Structural Engineering, Aalto University, School of Engineering, Espoo.
    Controlling physical properties of cementitious matrixes by nanomaterials p12010In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 123-125, p. 639-642Article in journal (Refereed)
    Abstract [en]

    The majority of concrete used nowadays is based on matrixes formed by hydrating Portland cement. Latest developments in nanosciences introduced a new generation of nano-sized materials possessing often remarkable mechanical and physical properties. These materials can be also used to improve or alter the characteristics of the binder matrixes based on Portland cement. The results showed that mechanical properties such as compressive and flexural strength can be increased by up to 50% by addition of for example 0.23wt% of carbon nanotubes. Carbon nanotubes and carbon nanofibres and/or nanosilica appeared to improve also the frost resistance. Other properties, such as autogenous shrinkage decreased significantly after addition of carbon nanofibres. Nanosilica enabled an immense densification of the hydrated binder matrix, which in turn improved for instance the durability and mechanical properties. © (2010) Trans Tech Publications.

  • 3.
    Deng, Liang
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Mozgovoy, Sergej
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
    Hardell, Jens
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
    Prakash, Braham
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
    Oldenburg, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Implementation of wear models for stamping tools under press hardening conditions based on laboratory tests2014In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 1063, p. 339-342Article in journal (Refereed)
    Abstract [en]

    Tool wear occurring in press hardening processes receives insufficient attention since its corresponding measurements and full-scale experiments are complicated and expensive. This paper presents a study of tool wear in press hardening based on laboratory experiments and FE-simulations. Two experimental laboratory setups depending on the contact conditions in press hardening build the base for the wear models implemented in the FE-simulation to predict wear depths. The highest wear depth is found at the radius of the stamping tool and the discrepancies in wear predictions based on the two different laboratory test setups are analyzed.

  • 4.
    Han, Fenglan
    et al.
    School of Material Science and Engineering, Beifang University of Nationalities, Wenchangbeilu, Yinchuan.
    Wu, Laner
    School of Material Science and Engineering, Beifang University of Nationalities, Wenchangbeilu, Yinchuan.
    Guo, Shengwei
    School of Material Science and Engineering, Beifang University of Nationalities, Wenchangbeilu, Yinchuan.
    Yang, Qixing
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Du, Chun
    College of Chemical Engineering, Beifang University of Nationalities Wenchangbeilu, Yinchuan.
    Fluoride evaporation during thermal treatment of waste slag from Mg production using pidgeon process2012In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 581-582, p. 1044-1049Article in journal (Refereed)
    Abstract [en]

    Fluoride evaporation from Mg slag samples was investigated. F content in the original slag sample from an Mg factory was 1.65%, which decreases to 0.98-1.54% in the samples heated at 1000-1400°C for 3 hours. The values of F evaporation from the test samples were 6.7-40.6%. The fluorides may evaporate in the atmosphere, causing air pollution. Some suggestions were presented based on study results obtained to minimize fluoride emissions and improve environmental performances of the Mg production by using Pidgeon process

  • 5.
    Han, Fenglan
    et al.
    School of Material Science & Engineering, Beifang University of Nationality, Yinchuan, Ningxia.
    Yang, Qixing
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Wu, Laner
    School of Material Science & Engineering, Beifang University of Nationality, Yinchuan, Ningxia.
    Du, Chun
    College of Chemical Engineering, Beifang University of Nationalities Wenchangbeilu, Yinchuan.
    Innovative utilization of a borate additive in magnesium production to decrease environmental impact of fluorides from pidgeon process2013In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 690-693, p. 378-389Article in journal (Refereed)
    Abstract [en]

    The present authors have utilized, for the first time, H3BO3 as an additive in pilot scale experiments of Mg production using Pidgeon process. The results from the experiments revealed positive effects of H3BO3 on both quantity and quality of the Mg metal crowns. Besides acting as a catalyzer for MgO reduction, H3BO3 stabilized also β-Ca2SiO4 in the Mg slag. Based on these results, H3BO3 may be adopted as an innovative additive replacing fluorite in the Mg production, to enhance sustainability and environmental soundness for the Pidgeon process in China.

  • 6.
    Han, Fenglan
    et al.
    School of Material Science and Engineering, Beifang University of Nationalities, Yinchuan.
    Yang, Qixing
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Wu, Laner
    School of Material Science and Engineering, Beifang University of Nationalities, Yinchuan.
    Guo, Shengwei
    School of Material Science and Engineering, Beifang University of Nationalities, Yinchuan.
    Treatments of magnesium slag to recycle waste from Pidgeon process2012In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, p. 1657-1667Article in journal (Refereed)
    Abstract [en]

    Magnesium slag powder from a local magnesium plant was treated to improve the volume stability for its application as building materials. The slag was mixed with borates, pressed into briquettes, and then sintered at high temperature. SEM studies show that at the higher temperature Ca 2SiO4 polymorphs were stabilized by Na and B ions in the added borates. The free MgO content in the slag was also decreased by the sintering treatment. The slag powder, after mixing with 0.4-0.6% of borates and sintered at 1200°C in 5-6 hours, has become volume stable aggregates. It is then possible to use the treated slag in constructions, saving valuable natural resources and decreasing the global warming impact from magnesium production via Pidgeon process

  • 7.
    Han, Fenglan
    et al.
    School of Material Science and Engineering, Beifang University of Nationalities, Yinchuan.
    Yang, Qixing
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Wu, Laner
    School of Material Science and Engineering, Beifang University of Nationalities, Yinchuan.
    Guo, Shengwei
    School of Material Science and Engineering, Beifang University of Nationalities, Yinchuan.
    Jiang, Yong
    School of Material Science and Engineering, Beifang University of Nationalities, Yinchuan.
    Environmental performance of fluorite used to catalyze MgO reduction in pidgeon process2012In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 577, p. 31-38Article in journal (Refereed)
    Abstract [en]

    Environmental performances of fluorite used as catalyzer for chemical reaction between MgO and Si were investigated by performing pilot scale experiments of Mg production. F amounts of 0.012-0.116 kg were added in the charged briquettes and Mg slag generated from the chemical reaction in most of the tests weighted 4.26-4.96 kg with F contents ranging 0.21-2.52%. Based on high recoveries of F, 83-100%, in the slag after the reaction, it is estimated that there are little or no F compounds leaving the retorts during the pilot tests. However, high amount of F, 72.9 mg/kg, was leached out from an Mg slag sample obtained from an Mg plant, making it necessary to decrease amount of fluorite used as catalyzer for the reaction or to improve operation conditions, thus, enhancing rate for chemical reaction between MgO and Si in Pidgeon process

  • 8.
    Han, F.L.
    et al.
    Beifang University of Nationality, Yinchuan, Ningxia.
    Wu, L.N.
    Beifang University of Nationality, Yinchuan, Ningxia.
    Yang, Qixing
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Du, C.
    Beifang University of Nationality, Yinchuan, Ningxia.
    Fluorine vaporization and leaching from Mg slag treated at high temperature2013In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 726-731, p. 2898-2907Article in journal (Refereed)
    Abstract [en]

    Pidgeon process is used by more than 300 plants in China to produce magnesium (Mg) metal. Fluorite, ranging 2-3%, is often mixed in raw materials to catalyze the Mg production. The Mg slag from the production then contains F of several mass percent. When the Mg slag is used in construction or treated for recycling, possible F pollutions are of concerns. The present study used slag samples containing F of 0.98-2.15% from an Mg factory in northwest China. Both treatments at 1000-1400°C and leaching tests before and after the treatments were conducted for the slag samples. The study results show influences of the treatments on mineral compositions of the samples, which controlled F contents in both the slag samples and leachates. The results are reported and discussed. Some suggestions are also presented to minimize fluorine pollutions and to improve environmental performances of the Pidgeon process

  • 9.
    Khoshkhoo, Mohammad
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Dopson, Mark
    Linnaeus University, Kalmar.
    Sandström, Åke
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Bioleaching and electrochemical leaching of a pyritic chalcopyrite concentrate2013In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 825, p. 254-257Article in journal (Refereed)
    Abstract [en]

    Moderately thermophilic bioleaching of a pyritic chalcopyrite concentrate was mimicked in an electrochemical vessel. The bioleaching was carried out for 28 days at 45°C with 2.5% (wt/vol) solid content at pH 1.5. Data from the redox potential development was used to program a redox potential controller in an electrochemical vessel to reproduce the same leaching conditions in the absence of microorganisms. Despite precipitation of iron as jarosite and formation of elemental sulphur in the electrochemical experiment, the copper recoveries were almost the same in both experiments.

  • 10.
    Phanwiroj, Prompoom
    et al.
    Center of Excellence in Textiles, Department of Materials Science, Chulalongkorn University, Bangkok.
    Tanpichai, Supachok
    cLearning institute, King Mongkut’s University of Technology Thonburi, Bangkok.
    Potiyaraj, Pranut
    Center of Excellence in Textiles, Department of Materials Science, Chulalongkorn University, Bangkok.
    Effects of preparation parameters on morphology of cellulose nanowhiskers2014In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 1044-1045, p. 35-38Article in journal (Refereed)
    Abstract [en]

    The aim of this research was to study the parameters on the properties of cellulose nanowhiskers. Cellulose nanowhiskers were prepared from two different cellulose sources (filter paper and alpha cellulose), and their morphology were further investigated. Cellulose nanowhiskers were firstly extracted from two commercial cellulose sources (paper filter and alpha cellulose) using sulfuric treatement with treatment times of 20, 45, 70, 95 and 120 min respectively and temperature of 37, 45 and 60 °C respectively. The hydrolyzed cellulose was then neutralized with two different techniques, dialysis and titration. The samples were subsequently sonicated, and freezed dried. The effect of preparation conditions on the morphology of cellulose nanowhiskers was investigated. Cellulose nanowhiskers were characterized using scanning electron microscopy and transmission electron microscopy. The results showed that 9 nm diameter cellulose nanowhiskers can be prepared. A possible correlation between the preparation conditions and cellulose particle sizes could not be observed, but the titration process used to neutralize cellulose can shorten the length of the preparation time from 168 h to only 50 h.

  • 11.
    Potiyaraj, Pranut
    et al.
    Department of Materials Science, Chulalongkorn University, Bangkok.
    Tanpichai, Supachok
    Department of Materials Science, Faculty of Science, Chulalongkorn University, Bangkok .
    Phanwiroj, Prompoom
    Department of Materials Science, Faculty of Science, Chulalongkorn University, Bangkok .
    Physical properties of PP/recycled PET blends prepared by pulverization technique2012In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 488-489, p. 109-113Article in journal (Refereed)
    Abstract [en]

    Polymer blends between pristine polypropylene (PP) and post-consumer soft-drink PET bottles (rPET) were prepared using pulverization technique. The polymer mixtures were pulverized, at the amounts of rPET in PP of 0, 10, 15, 20 and 30 phr (parts per hundred of resin) by weight, into powder. In an extruder, the polymer powders were mixed with maleic anhydride-grafted polypropylene (MAPP) and polyethylene wax (PE wax) as a compatibilizer and a processing aid, respectively. The extrudates were prepared into test specimens by injection molding. Physical properties of PP/rPET blends were subsequently investigated. The results pointed out that, for the pulverized blends without compatibilizer, tensile and flexural strength were improved at the lower amount of rPET. The compatibilizing effect of MAPP was exhibited at the higher amount of rPET. The reduction of melt flow index (MFI) may cause difficulties for some processing techniques which required polymers with high MFI. The addition of PE wax successfully brought up the MFI as well as elongation at break while other mechanical properties decreased.

  • 12.
    Rao, K. Hanumantha
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Vilinska, Annamaria
    Chernyshova, Irina V.
    Columbia University.
    Microorganisms in bioflotation and bioflocculation: potential application and research needs2009In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, p. 319-328Article in journal (Refereed)
    Abstract [en]

    Conventionally, physico-chemical methods are used in mineral processing for recovering value minerals from ores. The ageing of ore processing tailings and waste rocks, and mining tailings contamination by chemical reagents constitute a major threat to the environment. It is imperative to develop novel economically more efficient and environmentally benign methods of flotation and waste processing, exploiting the intriguing and exciting ability of bacteria to selectively modify the surface properties of solids. Microorganisms have not only facilitate hydrometallurgical leaching operations but have also show a great promise in mineral beneficiation processes such as flotation and flocculation. Several laboratory investigations revealed that microorganisms could function similar to traditional reagents. Microorganisms have a tremendous influence on their environment through the transfer of energy, charge, and materials across a complex biotic mineral-solution interface. The bio-modification of mineral surfaces involves the complex action of microorganism on the mineral surface. The manner, in which bacteria affect the surface reactivity and the mechanism of bacteria adsorption, is still unknown and accumulation of the primary data in this area is only starting. The bio-flotation and bio-flocculation processes concern the mineral response to the bacterium presence, which is essentially interplay between microorganism and the physicochemical properties of the mineral surface, such as the atomic and electronic structure, the net charge/potential, acid-base properties, and wettability of the surface. There is an urgent need for developing basic knowledge that would underpin biotechnological innovations in the natural resource (re)processing technologies that deliver competitive solutions.

  • 13.
    Sandak, Jakub
    et al.
    IVALSA/CNR, via Biasi 75, 38010 San Michele All’Adige (TN), Italy.
    Sandak, Anna
    IVALSA/CNR, via Biasi 75, 38010 San Michele All’Adige (TN), Italy.
    Dusan, Pauliny
    IVALSA/CNR, via Biasi 75, 38010 San Michele All’Adige (TN), Italy.
    Krasnoshlyk, Victoria
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Hagman, Olle
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Near infrared spectroscopy as a tool for estimation of mechanical stresses in wood2013In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 778, p. 448-453Article in journal (Refereed)
    Abstract [en]

    Significant scientific work has been dedicated for exploration of the infrared applications within wood science and technology, not much has been done linking it to the mechanical testing. It is expected that due to mechanical stresses (and related deformations) the interaction between constitutive elements of wood changes, proportionally to the stresses applied. The response of the material to mechanical stresses (such as tensile loading) on the molecular level should be therefore detectable by means of infrared spectroscopy. Dedicated tests have been devoted for proving this hypothesis. Self developed testing machine has been integrated with infrared spectrometer in order to conduct a series fully controlled mechanical tests. It was possible to predict stress level of wood during tension by applying proper chemometric analysis (partial least square (PLS) models). Implementation of infrared spectroscopy in to timber engineering and mechanical testing of wood provides very essential supplement to the typical information collected during standard tests. More additional tests and reference data is necessary in order to create more reliable and universal model suitable for routine assessments. Nevertheless, it was demonstrated that prediction of the stress on the basis of the infrared spectra is possible.

  • 14.
    Sany, Seyed Mohammad Khoshkhoo
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
    Dopson, Mark
    Linnaeus University, Kalmar, Department of Molecular Biology, Umeå University, Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University.
    Sandström, Åke
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
    Role of Microbial Activity in Bioleaching of a Pyritic and a Pure Chalcopyrite Concentrate2015In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 1130, p. 209-213Article in journal (Refereed)
    Abstract [en]

    Leaching of a pyritic and a pure chalcopyrite concentrate was carried out in stirred tank reactors in the absence and presence of a mixed culture of moderately thermophilic microorganisms at 45°C and pH 1.5. To study the effect of microbial activity on copper dissolution, the abiotic experiments were performed under accurately controlled redox potential conditions to reproduce the same oxidising conditions recorded during the bioleaching experiments. X-ray photoelectron spectrometry (XPS) was used to study the surface of chalcopyrite chips leached for different durations. The results showed that the microorganisms in cases of both concentrates did not have any effect in the copper leaching efficiency other than oxidation of ferrous to ferric ions. Biooxidation of elemental sulphur did not improve the leaching efficiency and bulk and surface jarosite had no negative effect on dissolution. A composite layer composed of mainly elemental sulphur and iron-oxy-hydroxide was found to be responsible for the hindered dissolution.

  • 15.
    Shakeri, A.
    et al.
    Golestan University, Gorgan.
    Jonoobi, Mehdi
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Water repellent cellulose nanofibers by acetylation2011In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, p. 209-212Article in journal (Refereed)
    Abstract [en]

    Kenaf nanofibers (NF) were isolated from the kenaf pulp using mechanical isolation methods (refining with super grounding and high pressure homogenization). The kenaf NF were acetylated to produce hydrophobic NF. FTIR results displayed a successful acetylation of the NF. X-ray analysis exhibited that the acetylation process reduced the crystallinity of kenaf NF but also that isolation to NF leads to higher crystallinity than corresponding micro-sized fibers. The contact angle measurements indicated that the acetylation treatment changed the surface characteristics of the kenaf NF from hydrophilic to more hydrophobic.

  • 16.
    Tanpichai, Supachok
    et al.
    Learning Institute, King Mongkut's University of Technology Thonburi.
    Sampson, William W.
    School of Materials, University of Manchester.
    Eichhorn, Stephen J.
    College of Engineering, Mathematics and Physical Sciences, University of Exeter.
    Microfibrillated cellulose reinforced poly(vinyl alcohol) composites2013In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 747, p. 359-362Article in journal (Refereed)
    Abstract [en]

    Microfibrillated cellulose (MFC) was successfully prepared from lyocell fibers using combined homogenization and sonication treatments. MFC fibrils with a mean diameter of ~365 nm were observed, after the lyocell fibers with diameters of ~10 μm were mechanically treated for 60 min. Poly(vinyl alcohol) (PVA) composites reinforced with MFC were then fabricated using a solvent casting method. Physical and mechanical properties of the MFC reinforced PVA composites were investigated. An increase of ~13 and ~34% of tensile strength and Young's modulus was observed for the 3 wt% MFC reinforced composites, compared to those of the pure PVA. Raman spectroscopy was also employed to study the deformation micromechanics of the MFC reinforced PVA composites. The position of the Raman peak initially located at ~1095 cm-1, corresponding to the C-O ring stretching and C-O-C glycosidic bond stretching modes, was recorded. During tensile deformation, this peak was observed to shift towards a lower wavenumber position, indicating stress-transfer between the resin and the fibrils.

  • 17. Vilinska, Annamaria
    et al.
    Rao, K. Hanumantha
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Forssberg, Eric
    Selective coagulation in chalcopyrite/pyrite mineral system using Acidothiobacillus group bacteria2007In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 20-21, p. 366-370Article in journal (Refereed)
    Abstract [en]

    Acidithiobacillus ferrooxidans cells grown in ferrous ions were used to study the surface modification of pyrite and chalcopyrite, with focus on coagulation of very fine particles (-5 μm). The zeta-potential studies of the minerals, before and after bacterial treatment, showed that the cells have a distinct influence on the surface charge of pyrite and chalcopyrite. The maximum coagulation of particles determined by Turbiscan as a function of pH correlated well with the zeta- potential results. Using diffuse reflectance FT-IR spectroscopic studies, the adhesion of cells showed a varied influence on these minerals. The results demonstrate that Acidithiobacillus ferrooxidans interact with pyrite and chalcopyrite differently, allowing selective coagulation of one mineral from the other under different pH conditions.

  • 18.
    Wang, Xiaodong (Alice)
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Hagman, Olle
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Björngrim, Niclas
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Engineered wood in cold climate: application to monitoring of a new Swedish suspension bridge2013In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 639-640, p. 96-104Article in journal (Refereed)
    Abstract [en]

    Engineered wood is increasingly used in large structures in Europe, though little is known of its behavior in cold climate. This paper presents the structural health monitoring (SHM) system of a newly built suspension bridge with a deck of glulam timber as well as a bond stability study regarding cold climate performance of engineered wood. The bridge is located in Skellefteå in northern Sweden, and it connects two parts of the city situated on opposite shores of the Skellefteå river. In this ongoing study of the timber-bridge, a structural health monitoring system is employed to verify structural design and long-term performance. This 130m-span bridge is monitored using GNSS receivers, MEMS accelerometers, laser positioning systems, wireless moisture content sensors, strain gauges and weather stations. Data from the monitoring systems is analyzed regarding accuracy, complexity, costs and reliability for long time use. Engineered wood application in bridges, sports centers and timber buildings are discussed. Bond stability of glulam structures in cold climate is also examined in a range of experiments ranging from small glued wood joints to full size glulam bridge performance over time. From an engineered wood material point of view, the study is relevant to cold regions such as Scandinavia, Canada, Alaska, Russia, and the northern parts of China and Japan etc. The engineered wood constructions in these areas will be exposed to low temperature in a quite long period each year. The goal is to determine how engineered wood behaves when exposed to temperatures between 20 °C to -60 °C.

  • 19.
    Wu, L.N.
    et al.
    Beifang University of Nationality, Yinchuan, Ningxia.
    Han, F.L.
    Beifang University of Nationality, Yinchuan, Ningxia.
    Yang, Qixing
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Du, C.
    Beifang University of Nationality, Yinchuan, Ningxia.
    Xu, A.J.
    School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing.
    Li, J.L.
    School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing.
    Fluorine vaporization and leaching from Mg slag treated at different conditions2013In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 753-755, p. 88-94Article in journal (Refereed)
    Abstract [en]

    Both treatments and leaching tests of an Mg slag sample containing F of 2.15% from an Mg factory in northwest China were conducted in the present study, focusing on problems of F pollutions. By treating at 1000-1200°C in a muffle furnace, F leaching was decreased to a minimum level of 0.49-2.85 mg/l from the Mg slag with an original F leaching of 13.9 mg/l. The F leaching values increased to 4.83-95.5 mg/l, while treating the slag samples in a vacuum furnace. The treatments of Mg slag may thus be carried out in oxidizing atmosphere and under 1200°C to minimize fluorine pollutions and to improve environmental performances of the Pidgeon process.

  • 20.
    Yang, Qixing
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Haase, Björn
    Höganäs Sweden AB, SE-263 83 Höganäs.
    Han, Fenglan
    School of Material Science & Engineering, Beifang University of Nationality, Yinchuan, Ningxia.
    Engström, Fredrik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Li, Jianli
    Department of Ferrous Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing.
    Xu, Anjun
    Department of Ferrous Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing.
    Björkman, Bo
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Laboratory treatments of EAF slag for its use in construction2013In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 726-731, p. 2921-2930Article in journal (Refereed)
    Abstract [en]

    Laboratory treatments of a plant EAF slag sample 71686 were conducted using stabilizers containing P2O5 and air granulation. The results show that it is necessary to add the stabilizers to increase contents of P2O5 from 0.39% to 0.7% for the slag stabilization. By a fast air cooling, most of the granules from the granulation are spherical, with a low internal porosity and dense structure. Content of Fe2O3 in the granules increased from 7.92% to 18.4% and FeO decreased from 14.3% to 7.8%, due to an oxidation during the slag granulation. Contents of metal elements, As, Cd, Cr, Mo, Pb, Ni and Zn, in the leachates from the treated slag samples were lower than the limit values for leaching from inert wastes pursuant to Directive 1999/31/EC. The slag samples after the treatments may then be regarded as environmentally friendly to use in construction

  • 21.
    Yang, Qixing
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Haase, Björn
    Höganäs Sweden AB, SE-263 83 Höganäs.
    Han, Fenglan
    School of Material Science & Engineering, Beifang University of Nationality, Yinchuan, Ningxia.
    Xu, Anjun
    Department of Ferrous Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing.
    Engström, Fredrik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Li, Jianli
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Björkman, Bo
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
    Plant treatments of EAF slag for its use as construction materials2013In: Advanced Materials Research, ISSN 1022-6680, E-ISSN 1662-8985, Vol. 750-752, p. 1244-1253Article in journal (Refereed)
1 - 21 of 21
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