Showing papers in "Materials Science Forum in 2018"
TL;DR: In this article, the influence of type of fiber on inter-layer bond strength and flexural strength of extrusion-based 3D printed geopolymer was investigated, and the results indicated that the incorporation of fibers reduced the inter layer bond strength.
Abstract: Extrusion-based 3D concrete printing is analogous to fused deposition modeling method, which extrudes cementitious materials from a nozzle to build a complex concrete structure layer-by-layer without the use of expensive formwork. This study aims to investigate the influence of type of fiber on inter-layer bond strength and flexural strength of extrusion-based 3D printed geopolymer. An extrudable fly ash-based geopolymer composition previously developed by the authors was reinforced by three types of fibers, namely polyvinyl alcohol (PVA), polypropylene (PP) and polyphenylene benzobisoxazole (PBO) fibers. Control geopolymer specimens with no fiber were also 3D printed for comparison purposes. The results indicated that the incorporation of fibers reduced the inter-layer bond strength of 3D printed geopolymer. This pattern was true regardless of the type of fiber. On the other hand, the flexural strength of 3D printed fiber-reinforced geopolymer mixtures was substantially higher than that of the 3D printed geopolymer with no fiber. The rate of increase in the flexural strength depended on the type of fiber. The flexural failures of the specimens were due to the tensile failure of the bottom layer, rather than the shear failure of the interfaces.
68 citations
TL;DR: In this paper, the authors synthesized graphene oxide via chemical method (improved method) and reduced graphene oxide (rGO) using thermal treatment, and the GO and rGO thin films were coated on a glass substrate by using drop casting method.
Abstract: In this work, graphene oxide (GO) is synthesized via chemical method (improved method) and reduced graphene oxide (rGO) using thermal treatment. The GO and rGO thin films were coated on a glass substrate by using drop casting method. The GO and rGO thin film were characterized by scanning electron microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) to make sure the morphological and optical characteristics of the thin film. In addition, the electrical studies were performed by current-voltage (I-V) characteristic. The rGO thin film displays higher conductivity in comparison with GO which is 4.12 x 10-5 S/cm, and also affected the morphological (SEM) and optical properties (FTIR). Morphological and optical data confirms that rGO losses the oxygen groups compare to GO.
46 citations
TL;DR: In this article, the authors describe Industry 4.0 as two of the most important trends in production and logistics and give an overview about important solutions in this area, according to material sciences, as it is also very important to develop and use new materials.
Abstract: Industry 4.0 and Logistics 4.0 are highly modern terms. They are connected with the common trend of digitalization, virtualization and networking of data and information. Typical is the implementation of new information and communication technologies into production and logistics practice. This will change the working conditions, processes as well as business models. “Industry 4.0” is the synonym for the 4-th industrial revolution in a general understanding. The term “Industry 4.0” was first used in a high-tech-strategy project of the German government in 2011 at the Hannover Fair. (Compare [1,2]) The paper describes the terms Industry 4.0 and Logistics 4.0 as two of the most important trends in production and logistics. It characterizes the big chances of this development. The paper gives an overview about important solutions in this area. (Compare [3]) Some new solutions are discussed according to material sciences, as it is also very important to develop and use new materials, which help to create smart solutions. Smart materials are created in the areas of e.g. laminated, composite and functionally graded materials, thermal and piezoelectric actuation, active and passive damping, vibrations and waves in smart structures. (Compare [4]) Smart materials allow the design and implementation of actuator, sensor fields and networks. Further examples are self-reporting materials, which autonomously report about problems and defects. This allows an evaluation and control of defects of components during their use and application. (Compare [5])
38 citations
TL;DR: The PRESiCETM as mentioned in this paper process was successful in making 1.2 kV rated state-of-the-art 4H-SiC power devices (MOSFETs, BiDFETs and JBS Rectifiers) in the X-Fab foundry.
Abstract: PowerAmerica sponsored the development by NCSU of a process for manufacturing power MOSFETs and JBS Rectifiers in 2015. This process, named PRESiCETM, was successful in making 1.2 kV rated state-of-the-art 4H-SiC power devices (MOSFETs, BiDFETs, and JBS Rectifiers) in the X-Fab foundry. In addition, we were successful in monolithically integrating a JBS fly-back rectifier into the power MOSFET structure to create the power JBSFET which allows saving significant (~ 40 %) chip area and reducing package count in half. In the second year (2016), NCSU has qualified the process for manufacturing these power devices at X-Fab.
31 citations
TL;DR: In this paper, the use of the mining waste: dropout of quartzite sandstone crushing as filler in the fibre concrete production was considered. And the effectiveness of composite binders based on cement and dropout from quartzite sarsen crushing was also developed.
Abstract: In the article the questions of application of the mining waste: dropout of quartzite sandstone crushing as filler in the fibre concrete production were considered. Composite binders based on cement and dropout of quartzite sandstone crushing were also developed. The effectiveness of composite binders’ usage consisting in improving the physical and mechanical characteristics and reduction of their prime cost compared to the cement with a slight increase in the complexity of their production was proved. The compositions of concrete dispersed reinforced with steel wave fiber and without it were developed. The efficiency of the use of dispersed reinforcement of fine-grained concrete is proved, which consists in improving the performance characteristics.
31 citations
TL;DR: In this article, a study of constructed wetland substrates was carried out using literature research and comparative meta-analysis, and the results showed that, for static adsorption, the absorption levels of nitrogen and phosphorus in a given constructed wetlands are different.
Abstract: Based on the improvements in the decontamination ability and decontamination range of constructed wetlands, this study of constructed wetland substrates was carried out using literature research and comparative meta-analysis. The results show that, for static adsorption, the absorption levels of nitrogen and phosphorus in a given constructed wetland are different. As for hydraulic load, the average removal rate of total nitrogen in wastewater is less than 50%. Compared with single substrates, a combination of substrates is typically superior in terms of the removal rate of sewage pollutants. Adsorption is the key in removing pollutants in constructed wetlands, and modification of the wetland materials is an effective way to improve the decontamination ability of the substrate material. At present, there are areas of potential improvement in the research on the development of new wetland materials for the study of pollutant characteristics, as well as a dearth of modification methods for single and reclaimable wetland substrates in constructed wetlands. These issues should be taken into account in the future studies on constructed wetland materials.
31 citations
TL;DR: In this paper, the effects of binder saturation level on linear dimensional accuracy and compressive strength of 3D printed geopolymer were investigated for powder-based 3D concrete printing.
Abstract: Powder-based 3D concrete printing (3DCP) process is highly suitable for producing building components and interior structures that can be later assembled on site. The accuracy and strength of 3D printed concrete components heavily rely on printing parameters, among which the binder saturation is the most decisive parameter. This paper reports the effects of binder saturation level on linear dimensional accuracy and compressive strength of 3D printed geopolymer. A geopolymer composition suitable for the powder-based 3DCP process previously developed by the authors was used in this study. 20 mm cubic specimens were printed with five binder saturation levels (75%, 100%, 125%, 150% and 170%). The results indicated that the increase in binder saturation level resulted in significant increase in compressive strengths of both green and post-processed samples in both directions. Nevertheless, the rate of increase in compressive strength of green samples was significantly higher than the post-processed samples. On the other hand, the increase in binder saturation level significantly reduced the linear dimensional accuracy of green samples in all directions. Nonetheless, the rate of reduction in linear dimensional accuracy in Z-direction was lower than the other two directions.
29 citations
TL;DR: In this article, the authors investigate the effect of the extrusion nozzle temperature and layer thickness on the final mechanical properties of the 3D printed samples from acrylonitrile butadiene styrene.
Abstract: 3D printing technology enables the production of functional components in small quantities which can be used as end-use parts. The mechanical properties of the final product define its quality and determine its success or failure in a given application. One at the various additive manufacturing technologies - Fused Deposition Modelling is very often used due to its relatively low cost and the availability of 3D printers and thermoplastic materials. During the process, there are many factors that can affect the mechanical properties of the final product. The temperature of the extrusion nozzle and the layer thickness are two of the basic process parameters. The objective of this work is to investigate the effect of these two processing parameters on the final mechanical properties of the 3D printed samples from acrylonitrile butadiene styrene. Mechanical testing includes the tensile and flexural strength, as well as tensile and flexural modulus.
27 citations
TL;DR: In this paper, an analysis of current methods for control and evaluation of technical state for different water conveyance constructions in the field of hydraulic engineering and reclamation was carried out and it showed the necessity of their improvement and development.
Abstract: Analysis of current methods for control and evaluation of technical state for different water conveyance constructions in the field of hydraulic engineering and reclamation was carried out and it showed the necessity of their improvement and development. Significant indices of technical state and operational capability resource of the constructions were defined. Promising methods for evaluation of structures technical state based on the methods of non-destroying control are substantiated. Fundamental principles to carry out technical state monitoring and evaluation of remaining live of projects operational capability were formulated, with the results of methodological approaches analysis in various fields of knowledge were taken into account. Automated technology for technical diagnostics of constructions by the methods of non-destroying instrumental control was developed. This control secures determination of remaining live operational capability of structural elements and structure safety deficit for information support of decision making on operation measures. Ecologo-economic efficiency from adaptation of software and hardware complex for reliability diagnostics of hydraulic structures is stipulated by time expenditure shortening on survey carrying out, by higher quality of decision making and by automation of routine operations for information, collecting, processing and interpretating.
27 citations
TL;DR: In this article, the authors have performed accelerated high-energy neutron SEB testing of SiC and Si power devices at the Los Alamos Neutron Science Center (LANCSE).
Abstract: High-energy neutrons produced by cosmic ray interactions with our atmosphere are known to cause single-event burnout (SEB) failure in power devices operating at high fields. We have performed accelerated high-energy neutron SEB testing of SiC and Si power devices at the Los Alamos Neutron Science Center (LANCSE). Comparing Wolfspeed SiC MOSFETs having different voltage (900V – 3300V) and current (3.5A – 72A) ratings, we find a universal behavior when scaling failure rates by active area, and scaling drain bias by avalanche voltage. Moreover, diodes and MOSFETs behave similarly, revealing that the SiC drift dominates the failure characteristics for both device types. This universal scaling holds for SiC MOSFETs from other manufacturers as well. The SEB characteristics of Si power IGBT and MOSFET devices show that near their rated voltages failure rates of Si devices can be 10X higher than that of comparable SiC MOSFET devices. Thus, Si devices are more susceptible to SEB failure from voltage overshoot conditions.
26 citations
TL;DR: In this article, an assessment of technical condition of the building by creation of calculated model with application of the multipurpose program complex «Stark ES» of the version of 2018 is made.
Abstract: Assessment of technical condition of the building by creation of calculated model with application of the multipurpose program complex «Stark ES» of the version of 2018 is made.
TL;DR: In this paper, the effects of extended epitaxial defects on 4H-SiC power devices were explored, and the authors found that 3C inclusions and triangular defects, as well as heavily decorated substrate scratches, were device killing defects.
Abstract: This work explores the effects of extended epitaxial defects on 4H-SiC power devices. Advanced defect mapping techniques were used on large quantities of power device wafers, and data was aggregated to correlate device electrical characteristics to defect content. 1200 V class Junction Barrier Schottky (JBS) diodes and MOSFETs were examined in this manner; higher voltage 3.3 kV class devices were examined as well. 3C inclusions and triangular defects, as well as heavily decorated substrate scratches, were found to be device killing defects. Other defects were found to have negligible impacts on device yield, even in the case of extremely high threading dislocation content. Defect impacts on device reliability was explored on MOS-gate structures, as well as long-term device blocking tests on both MOSFETs and JBS diodes. Devices that passed on-wafer electrical parametric tests were found to operate reliably in these tests, regardless of defect content.
TL;DR: In this article, the authors investigated the formability of light-weight aluminium alloys for car body manufacturing at an industrial level, using tensile tests at temperatures down to −196 °C for characterisation of 5xxx and 6xxx series alloys.
Abstract: Despite extensive efforts to improve energy efficiency in the automotive sector, the use of light-weight aluminium alloys for car bodies is impeded by formability limitations. Although it is a known phenomenon that Al alloys increase their strength and ductility at very low temperatures, it has not been attempted to exploit this effect to increase their overall formability at an industrial scale. Over the last four years, the cryogenic sheet metal forming behaviour of Al-alloys was extensively investigated to establish a process robust enough for manufacturing automotive parts at an industrial level. Initial experiments include tensile tests at temperatures down to –196 °C for characterisation of 5xxx and 6xxx series Al alloys, providing the mechanical material data for numerical design simulations of sheet metal forming processes at cryogenic temperatures. Numerical simulations will not be discussed in this publication. Furthermore, the necessary hardware for cryogenic sheet metal forming was developed and finally resulted in a semi-automated small scale industrial production site. The production of a miniaturized B-Pillar was demonstrated for 5xxx and 6xxx alloys. Due to the part’s demanding geometry, defect-free deep drawing process is possible at cryogenic temperature only. These results demonstrate that the use of Al alloys could be extended beyond their current applications in cars components. For example, the overall formability of 5xxx series alloys nearly doubles compared to room temperature. This paper shall give an overview over our work in the field of cryogenic aluminium sheet metal forming within the last couple of years.
TL;DR: In this article, the authors conducted the analysis of scientific and technical references relating to the issue of increasing maintenance reliability of pre-stressed reinforced concrete by means of taking into account concrete non-homogeneity in the calculations of strength, deformability and crack resistance of the reinforced concrete products with annular section.
Abstract: The authors conducted the analysis of scientific and technical references relating to the issue of increasing maintenance reliability of pre-stressed reinforced concrete by means of taking into account concrete non-homogeneity in the calculations of strength, deformability and crack resistance of the reinforced concrete products with annular section. The authors stated the opportunity to increase the quality of concrete intended for centrifugation by means of regulating the properties of used materials. It was identified that applying disperse-reinforced fibers resulted in increase in bending tensile strength, decrease in shrinkage, increase in crack resistance and material resistance towards alternate freezing and thawing, drying and humidification cycles. Upon the results of conducted research and comparison of the properties of various fibers, the authors obtained regularities and application rules on fiber use and gave recommendations in terms of applying one of another fiber type. On the basis of the analysis of obtained results the authors made the conclusion that the highest effect in all tests was observed at the application of basalt fibers as they provide for a higher dispersion of cement rock reinforcement while the basalt fiber itself has a higher strength comparing with any other polymer fiber. Further, the authors conducted the research of mechanical properties characteristic for test beams made of heavy concrete to manufacture the annular section products by means of centrifugation. The obtained dependences allow making a conclusion that the percentage ratio of applied crushed stone fractions Fr 5-10 / Fr 5-20 = 50 / 50 under otherwise equal conditions has the highest influence on the heavy concrete ground strength.
TL;DR: In this article, the problem of concrete properties identification and damage location in model beam type constructions is considered on the basis of application of experimental vibration analysis, where beam structures are considered defect-free and with defects.
Abstract: The problem of concrete properties identification and damage location in model beam type constructions is considered on the basis of application of experimental vibration analysis. As a simple analysis model, beam structures are considered defect-free and with defects. Based on the experimental approach, the model vibrations under shock and vibration excitation are analyzed. On the basis of analytical modeling, the dynamic modulus of elasticity, the velocity of sound in the beam, and the location of the defect are calculated. A technique and an example of the location of a defect in beam type constructions are presented.
TL;DR: In this article, the electrical activation of 1×1020 cm-3 implanted Al in 4H-SiC has been studied in the temperature range 1500 - 1950 °C by the analysis of the sheet resistance of the Al implanted layers, as measured at room temperature.
Abstract: The electrical activation of 1×1020 cm-3 implanted Al in 4H-SiC has been studied in the temperature range 1500 - 1950 °C by the analysis of the sheet resistance of the Al implanted layers, as measured at room temperature. The minimum annealing time for reaching stationary electrical at fixed annealing temperature has been found. The samples with stationary electrical activation have been used to estimate the thermal activation energy for the electrical activation of the implanted Al.
TL;DR: The lack of industrially available materials for additive manufacturing (AM) of metallic materials along with the promises of materials with improved or unique properties provides a strong drive for de... as mentioned in this paper.
Abstract: Lack of industrially available materials for additive manufacturing (AM) of metallic materials along with the promises of materials with improved or unique properties provides a strong drive for de ...
TL;DR: In this article, the authors performed dynamic Mechanical Thermal Analysis (DMTA) of HDPE reinforced with surface modified 0D (Nanodiamonds-NDs), 1D (Multi Walled Carbon Nanotubes-MWCNTs) and 2D (Graphite nanoplatelets-GNPs) nanofillers.
Abstract: Present work reports on Dynamic Mechanical Thermal Analysis (DMTA) of HDPE reinforced with surface modified 0D (Nanodiamonds-NDs), 1D (Multi Walled Carbon Nanotubes-MWCNTs) and 2D (Graphite nanoplatelets-GNPs) nanofillers. Composite samples were prepared using twin screw injection moulding machine. Dynamic properties like storage, loss modulus and tan delta were investigated as a function of temperature and at constant oscillation of 1 Hz. Optimum properties were exhibited by 0.1 CNT/HDPE during a temperature swept from 30 to 110 oC. The storage modulus and loss modulus of 0.1 CNT/HDPE increased by 57 and 28% on comparison with pure HDPE. 0.1 CNT/HDPE exhibited highest ascent during tan delta evaluation confirming good damping property. TEM analysis was carried out to investigate the morphology of ND, MWCNT and GNP.
TL;DR: In this paper, the authors investigated the technology of wood-glued structures with strengthening the supporting zones by a prepreg on the basis of the fiberglass and the glued oligomer with the addition of the carbon nanotubes (CNTs).
Abstract: The article is devoted to the investigation of the technology of the wood-glued structures manufacture with strengthening the supporting zones by a prepreg on the basis of the fiberglass and the glued oligomer with the addition of the carbon nanotubes (CNTs). The peculiarities of the wooden beams cross-sections have been presented. The main types of fiberglass have been reviewed. The article describes strengthening the supporting zones of wooden and glued-wood beams. The method of nanoparticles application in adhesive compositions to improve their physical mechanical properties has been considered. The technological process of manufacturing the glued-wood structure and its strengthening has been developed.
TL;DR: In this article, the authors analyze the first experience of rental housing, constructed due to budget finances, and suggest the way how regional authorities can effectively stimulate private investors to construct social rental blocks of flats.
Abstract: Cities in Russia including St. Petersburg lack of social housing. The state measures involving financial budget support to families have appeared ineffective to solve the problem. Currently, over 170 thousand families in St. Petersburg need to improve their housing conditions. The paper considers alternative financial resources of social housing construction. The paper analyzes the first experience of rental housing, constructed due to budget finances. The social housing construction with private investment resources is proven. The authors suggest the way how regional authorities can effectively stimulate private investors to construct social rental blocks of flats.
TL;DR: In this article, the authors developed 4H-SiC trench MOSFETs with orthogonal Deep-P structures (ODSs) to improve the trade-off between the on-resistance and the gate oxide field.
Abstract: The authors have developed 4H-SiC trench MOSFETs with orthogonal Deep-P structures (ODSs) to improve the trade-off between the on-resistance and the gate oxide field. The conditions of photolithography to realize a miniaturized Deep-P pattern have been optimized. The fabricated MOSFETs with ODS have demonstrated a low on-resistance of 2 mΩcm2 and a high breakdown voltage of 1.8 kV.
TL;DR: In this article, a technique of high-quality fine-grained fiber concrete creation is presented, where the chemical composition of the binder was studied and the physical and mechanical characteristics of the filler were revealed.
Abstract: The article proves the efficiency of the construction-based use of fibre concrete. The technique of high-quality fine-grained fibre concrete creation is presented. The chemical composition of the binder was studied and the physical and mechanical characteristics of the filler were revealed. 2 types of steel fibers were studied: anchor and in the form of a fir-tree. The conducted studies proved the effectiveness of dispersed reinforcement with steel fiber. It is established, that the usage of fiber in the form of a fir-tree the greatest increase of operational characteristics is reached.
TL;DR: In this paper, an integral model of organizational and technological solutions for Burundian capital master plan is developed, which allows to choose the optimal criteria and monitor the quality of their implementation, regardless of the phase of the life cycle.
Abstract: Construction project involves a complex array of specific interdependent activities, undertaken by multiple participants with contradictions of interests. It has phases to follow in its life cycle to meet the project’s objectives. Each phase will typically have multiple sub-phases and processes. The choice of technological and organizational solutions is carried out in the planning and design phase. Changes affecting any task (or the need to resolve conflicting elements of two or more tasks) can have a significant knock-on effect on the project’s success, regardless of the phase of the life cycle. This paper intends to develop an integral model of organizational and technological solutions, which allows to choose the optimal criteria for Burundian capital master plan as well as monitoring the quality of their implementation.
TL;DR: By embedding an external Schottky barrier diodes into an SiC MOSFET, this article achieved compact 3.3 kV and 6.5 kV SBDs that are free from bipolar degradation.
Abstract: External Schottky barrier diodes (SBDs) used as free-wheel diodes should be larger in higher voltage devices to avoid bipolar degradation consequent on current conduction of body diodes in SiC MOSFETs. By embedding an external SBD into an SiC MOSFET, we achieved compact 3.3 kV and 6.5 kV SiC MOSFETs that are free from bipolar degradation. The active area of the 3.3 kV/6.5 kV samples is only about a half/quarter of the total active area of a conventional MOSFET and a coupled external SBD.
TL;DR: In this article, the authors proposed a model of degradation based on the law of conservation of energy for estimating the longevity of objects in an urban environment, where the urban environment is divided into a number of simpler systems, and each simple system is described by the simplest model.
Abstract: The longevity forecast is proposed to be implemented on the basis of models of degradation theory. The theory of degradation is developed as a general energy method for estimating the longevity of objects. It is based on the law of conservation of energy. To analyze the longevity of urban environment, it is proposed to adopt the simplest model of theory of degradation. The proposed work provides an explanation for the description of proposed model. The urban environment is divided into a number of simpler systems. The more the degree of system separation into simpler ones, the more accurately one can describe the behavior of the entire system in time. Each simple system is described by the simplest model of degradation theory. The general behavior of the system is understood as a simple sum of individual degradation models. A feature of the proposed theory is that the simplest model can describe the entire system or the sum of its individual parts at once. The model makes it possible to consider the issue of equalizing the longevity of individual systems. The analysis of durability of a multicompartment building is taken as an example. In terms of analyzing the given example, individual stages of systems operation, that are still subject to discussion, are identified.
TL;DR: In this article, the gate insulator process for SiC-MOSFET was examined and high-quality interface was realized by employing the pre-annealing process before high-temperature N2 annealing.
Abstract: The gate insulator process for SiC-MOSFET was examined and high-quality interface was realized by employing the pre-annealing process before high-temperature N2 annealing. The pre-annealing evidently activated the interface to introduce nitrogen, and then field-effect mobility exceeded 50 cm2/Vs. The fabricated sample also demonstrated superior bias temperature instability (BTI) and excellent breakdown electric field of 11.7 MV/cm.
TL;DR: In this paper, a methodological toolkit for developing an enterprise adaptability strategy is based on innovative management solutions that can be successfully implemented with the active involvement of management consultants, which will ensure the formation of an innovative process that is the most important factor of strategic adaptation.
Abstract: The article is dedicated to actual problems in the field of strategic adaptation of modern building enterprises and organizations to external changes. The methodological toolkit for developing an enterprise adaptability strategy is based on innovative management solutions that can be successfully implemented with the active involvement of management consultants. The important part of the work is analyzing of existing points of view of Russian and foreign representatives of scientific schools in the field of the studied problems. Advising, as professional assistance in solving key problems and achieving sustainable success in the activity of small and medium-sized business construction companies, is a management reserve, the rational use of which will ensure the formation of an innovative process that is the most important factor of strategic adaptation. Taking into account the results of the research, author gives his approach to the formation of managerial decisions on the strategic adaptation of small and medium-sized construction organizations aimed at ensuring the competitive advantages of enterprises and strengthening their positions in the internal and external markets in the conditions of market instability is described.
TL;DR: In this article, the authors evaluated the possibility of using iron ore tailing as an addition to the partial replacement of the cement in mortars, and the results of compressive strength were relevant for the substitutions.
Abstract: The manufacture of Portland cement used in the production of concrete emits large amounts of CO2 into the atmosphere, contributing to the increase of the greenhouse effect. The environmental impact generated by the mineral exploration activity is a problem of easy verification, especially in open pit mines. The present work evaluated the possibility of using iron ore tailing as an addition to the partial replacement of the cement in mortars. The iron ore tailings were processed by drying in oven (48h at 105oC) and milling in a planetary mill (10min at 300RPM), obtaining medium grain size of 14,13 μm. For the characterization, laser granulometry, X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential thermal and thermogravimetric analysis (DTA / TGA) were performed. The sample is composed predominantly by quartz, hematite, goethite and gibbsite. After the characterization, the waste was used in the preparation of test specimens, with 10, 20 and 30% weight substitution of the cement. The composites were submitted to compression tests, with ages of 3, 7 and 28 days, using a strength rate of 0,25MPa/s. The mortars with 10, 20 and 30% of substitution presented resistance of 41.65, 36.26 and 31.64 MPa, being able to be characterized as category of Portland cement of resistance 40, 32 and 25 respectively. Considering the reduction of cement in the mortars produced, the results of compressive strength were relevant for the substitutions. The cements produced with the substitutions according to the Brazilian standards under the mechanical aspect can be classified as Portland cement.