Showing papers in "Key Engineering Materials in 2016"
TL;DR: In this paper, the effect of layer thickness on the various mechanical properties of the component was investigated for 3D printed ABS polymer samples and the results showed that tensile strength (36 MPa), impact strength (103.6 J/m) and hardness (R107) were highest for the samples made by injection molding method.
Abstract: 3D Printed ABS polymer samples were investigated for understanding the effect of layer thickness on the various mechanical properties of the component. Standard samples with varying layer thickness were prepared by 3D printing machine which works on the principle of Fused Deposition modeling (FDM) method and compared with sample prepared by standard injection molding method. Results show that tensile strength (36 MPa), impact strength (103.6 J/m) and hardness (R107) were highest for the samples made by injection molding method. Furthermore, among 3D printed samples, properties were better with smaller layer thickness. With increase in layer thickness, there was negative effect on mechanical properties as tensile strength, impact strength and hardness decreased. Exception with hardness of 3D printed ABS samples was found; for largest layer thickness hardness further increased instead of decreasing.
59 citations
TL;DR: In this article, a high-speed direct laser deposition was performed for Ni-based alloy Inconel 625 and the influence of process parameters on product properties and material structure was defined.
Abstract: In this article the technology “high-speed direct laser deposition” is performed. Influence of process parameters on product properties and material structure was defined for Ni-based alloy Inconel 625. Developed technology provided the mechanic properties of products on the bottom level of rolled metal and allows avoid heat treatment and HIP in production process. Economic efficiency of this technology is demonstrated for main areas of industry.
53 citations
TL;DR: In this article, four mortars were formulated with different volumetric proportions of clayish earth and siliceous sand, and the results from the physical and mechanical characterization confirmed the significantly low linear shrinkage of all the four Mortars, as well as their extraordinary adsorption-desorption capacity.
Abstract: Clayish earth-based mortars can be considered eco-efficient products for indoor plastering since they can contribute to improve important aspects of building performance and sustainability. Apart from being products with low embodied energy when compared to other types of mortars used for interior plastering, mainly due to the use raw clay as natural binder, earth-based plasters may give a significant contribution for health and comfort of inhabitants. Due to high hygroscopicity of clay minerals, earth-based mortars present a high adsorption and desorption capacity, particularly when compared to other type of mortars for interior plastering. This capacity allows earth-based plasters to act as a moisture buffer, balancing the relative humidity of the indoor environment and, simultaneously, acting as a passive removal material, improving air quality. Therefore, earth-based plasters may also passively promote the energy efficiency of buildings, since they may contribute to decreasing the needs of mechanical ventilation and air conditioning. This study is part of an ongoing research regarding earth-based plasters and focuses on mortars specifically formulated with soils extracted from Portuguese ‘Barrocal’ region, in Algarve sedimentary basin. This region presents high potential for interior plastering due to regional geomorphology, that promote the occurrence of illitic soils characterized by a high adsorption capacity and low expansibility. More specifically, this study aims to assess how clayish earth and sand ratio of mortars formulation can influence the physical and mechanical properties of plasters. For this assessment four mortars were formulated with different volumetric proportions of clayish earth and siliceous sand. The results from the physical and mechanical characterization confirmed the significantly low linear shrinkage of all the four mortars, as well as their extraordinary adsorption-desorption capacity. These results presented a positive correlation with mortars clayish earth content and are consistent with the mineralogical analysis, that confirmed illite as the prevalent clay mineral in the clayish earth used for this study. Regarding mechanical resistance, although the promising results of the adhesion test, the flexural and compressive strength results suggest that the mechanical resistance of these mortars should be slightly improved. Considering the present results the mortars mechanical resistance improvement may be achieved through the formulation of mortars with higher clayish earth content, or alternatively, through the addition of natural fibers to mortars formulation, very common in this type of mortars. Both those options will be investigated in future research.
34 citations
TL;DR: In this article, the authors proposed a model for monitoring the effectiveness of the organization development and suggested that the development is possible only when the norms and standards upon which the method for determining the rate of development is proposed, are changed.
Abstract: The article is devoted to the development of a model for monitoring the effectiveness of the organization development. It is suggested that the development is possible only when the norms and standards, upon which the method for determining the rate of development of the organization is proposed, are changed
32 citations
TL;DR: In this article, an innovative syntactic foam produced out of metal powder (Fe), fly ash cenospheres (CS) and clay ceramic syntactic foams composite material (CM) is presented.
Abstract: This paper addresses an innovative syntactic foam produced out of metal powder (Fe), fly ash cenospheres (CS) and clay ceramic syntactic foams composite material (CM). Due to the low density of CS (bulk density - 0.38 g/cm3), the average density of these foams is about 2.6-2.9 g/cm3. It was found that CS undergoes phase transformation during thermal treatment at a temperature of 1200°C. Microstructural observations reveal a uniform distribution of CS and Fe particles in the composite. Compressive strength, and friction coefficient of obtained Fe/CS CM are in the range between 149 - 344 MPa and 0.15 - 1.1, respectively. Dependence of compressive strength on firing temperature is demonstrated exhibiting the maximum at 344 MPa; however, dependence of coefficient of friction on a material properties, obtained at different firing temperature exhibits the minimum value of 0.15 at the firing temperature of 1150 °C. The obtained syntactic form was shown to be a candidate for wear resistant applications.
29 citations
TL;DR: In this paper, the authors investigated the strength and mechanical properties of plain concrete, steel fibre reinforced concrete and polypropylene fiber reinforced concrete, and compared the effect of increasing fibres on the concrete.
Abstract: Fibres are generally used as resistance of cracking and strengthening of concrete. The purpose of this research is to investigate the strength and mechanical properties of plain concrete, steel fibre reinforced concrete and polypropylene fibre reinforced concrete. The main focus of this investigation is to understand the reinforcement material’s behaviour on concrete and to compare the effect of increasing fibres on the concrete. The percentages of fibre used for both types of concrete were 0.5%, 1%, 1.5% and 2%. Details and results of the experimental study are provided and discussed.
29 citations
TL;DR: In this paper, two aluminum alloy plates of 2017A-T451 and 7075-T651 with 6 mm thickness were friction stir butt welded and the weldability and blending of the two materials were evaluated by using macro- and microstructural analysis as well as EDS mapping to show the distribution of main alloying elements within the weld.
Abstract: Dissimilar aluminum alloy plates of 2017A-T451 and 7075-T651 with 6 mm thickness were friction stir butt welded. Numerous trials were conducted to determine the conditions that produce the highest weld quality. These parameters were found to be a welding speed of 112 mm/min, a rotation speed of 355 rev/min and a vertical force of 32,8 kN. The weldability and blending of the two materials were evaluated by using macro- and microstructural analysis as well as EDS mapping to show the distribution of main alloying elements within the weld. The effect of material locations, either on the advancing or retreating sides, on the microstructure and mechanical properties was also investigated. Hardness profiles differ substantially for different weld configurations. Regardless of the position of a particular alloy, the weld microstructure was composed of alternating layers of both materials. However, the layers of the 7075 alloy always exhibited smaller grain size and a larger number of secondary phase particles.
26 citations
TL;DR: In this article, the analysis of plastic injection molding process simulation using Autodesk Moldflow Insight (AMI) software in order to minimize shrinkage by optimizing the process parameters is presented.
Abstract: This study focuses on the analysis of plastic injection moulding process simulation using Autodesk Moldflow Insight (AMI) software in order to minimize shrinkage by optimizing the process parameters. Two types of gates which is single and dual gates have been analysed. Nessei NEX 1000 injection moulding machine and P20 mould material details are incorporated in this study on top of Acrylonitrile Butadiene Styrene (ABS) as a moulded thermoplastic material. Coolant inlet temperature, melt temperature, packing pressure and cooling time are selected as a variable parameter. Design Expert software is obtained as a medium for analysis and optimisation to minimize the shrinkage. The polynomial models are obtained using Design of Experiment (DOE) integrated with RSM Center Composite Design (CCD) method in this study. The results show that packing pressure is a main factor that contributed to shrinkage followed by coolant inlet temperature, while melt temperature and cooling time has less significant for both single and dual gates. Meanwhile, single gate shows a better result of shrinkage compared to the dual gates.
26 citations
TL;DR: The paper describes the synthesis of a multidimensional nonlinear model using the second order fuzzy controller with the required precision.
Abstract: Fuzzy controller is a multidimensional nonlinear static link. For the fuzzy controller synthesis it is sufficient to determine its desired static characteristic and adjust it so that it coincides with the desired one. The paper describes the synthesis of a multidimensional nonlinear model using the second order fuzzy controller with the required precision.
26 citations
TL;DR: The article discusses theoretic foundations and parameters of a latch die cutting process modelled in the software system Deform - 2D which causes the excessive edge deformation that does not meet the customers' requirements.
Abstract: The article discusses theoretic foundations and parameters of a latch die cutting process modelled in the software system Deform - 2D. The analysis concerns standard methods of latch cutting which causes the excessive edge deformation (over 10% of a sheet thickness) that does not meet the customers' requirements.
26 citations
TL;DR: In this article, the structural properties of Nd3+ doped sodium lead zinc lithium borate glass with chemical formula (65-x)B2O3-15Na2O-10PbO-5ZnO-4Li2O -5Li 2O-xNd2O 3 (where x = 0, 0.05,0.1, 0., 0.5, 1.0, 2.0 and 4.0) were reported using the melt-quenching method.
Abstract: The present paper reports the structural (XRD and FTIR spectra), physical (like density, molar volume, refractive index etc.), optical absorption and emission properties of Nd3+ doped sodium lead zinc lithium borate glass. The glasses with chemical formula (65-x)B2O3-15Na2O-10PbO-5ZnO-5Li2O-xNd2O3 (where x = 0, 0.05, 0.1, 0.5, 1.0, 2.0 and 4.0) have been prepared using the melt-quenching method. XRD characterization shows that the glasses are amorphous nature. The values of measured absorption transitions obtained ten transitions and the hypersensitive transition at 4I9/2 → 2G7/2+4G5/2. To excite photon from ground state to upper state, used two different wavelength spectra at 582 and 804 nm. The maximum emission intensity of the 4F3/2 → 4I11/2 transition obtained when Nd3+ ion content in the borate glass is 1.0 mol %. It is indicating that Nd3+ doped borate glass have self-quenching or concentration quenching.
TL;DR: A number of approaches to estimation of efficiency of associative design, which are based on estimates of the design timing, the number of imposed changes at appropriate stages of the product life cycle are proposed.
Abstract: The article is devoted to the application of the method of performance evaluation of the production process design, using associative design. A number of approaches to estimation of efficiency of associative design, which are based on estimates of the design timing, the number of imposed changes at appropriate stages of the product life cycle.
TL;DR: In this article, an improved approach to the calculations of priority number of risks is proposed, which will allow risk assessment of dependent undesired events, which can be used for technological process management with certain limitations.
Abstract: Existing methods of quality assessment of flat products are not sufficiently effective: they can be used for technological process management with certain limitations. Our research suggests an improved approach to the calculations of priority number of risks. The new suggested approach will allow risk assessment of dependent undesired events.
TL;DR: The value stream mapping is a fundamental lean device which can decrease the material-and information flow wastes as mentioned in this paper, which is very important in the improvement of the manufacturing processes, and it summarizes the application possibilities of these devices.
Abstract: Nowadays the lean philosophy is very important in the improvement of the manufacturing processes. The value stream mapping is a fundamental lean device which can decrease the material-and information flow wastes. This paper introduces in details the static and dynamic value stream mapping’s method and it summarizes the application possibilities of these devices. There are numerous research directions in this topic which will be outlined in this paper.
TL;DR: In this paper, the authors highlight the capability of Tekna's Inductively Coupled Plasma (ICP) technology for the production of high quality powders for the additive manufacturing industry.
Abstract: Powder metallurgy technologies require specific powders to ensure a good quality to the manufactured parts. The critical properties are; the powder chemistry, flow ability, packing density, and the absence of porosity. This review highlights the capability of Tekna’s Inductively Coupled Plasma (ICP) technology for the production of high quality powders for the additive manufacturing industry.
TL;DR: In this article, the authors deal with the issue of the helicopter SW4 rear gear driving shaft forming, where it is assumed that this shaft will be made from titanium alloy Ti6Al4V and it will be formed by means of cross-wedge rolling technology (CWR).
Abstract: This paper deals with the issue of the helicopter SW4 rear gear driving shaft forming. It was assumed that this shaft will be made from titanium alloy Ti6Al4V and it will be formed by means of cross-wedge rolling technology (CWR). It was also assumed that rolling will be realized in double configuration, which will guarantee axial symmetry of forming forces. The conception of tools guaranteeing the CWR process realization and numerical analysis results verifying the assumed CWR process parameters of the subject shaft were presented. Tests of shaft rolling in laboratory conditions at Lublin University of Technology were made, in the result of which the possibility of forming by means of CWR of a driving shaft, manufactured from titanium alloy Ti6Al4V, of the helicopter SW4 rear gear was verified.
TL;DR: In this paper, the authors discuss the methodology by which one can infer original shell microstructure from phosphatized fossils, pointing out the main problems and solutions in interpreting these traces of original shell crystal morphology.
Abstract: To infer the early evolution of mollusc shell microstructures we must know the most ancient fossil record of molluscs. Fortunately the shells of many early molluscs are preserved via internal coatings and replacements by apatite that record sub-micrometer structural details that otherwise would be lost during diagenetic recrystallization. We herein discuss the methodology by which one can infer original shell microstructure from phosphatized fossils, pointing out the main problems and solutions in interpreting these traces of original shell crystal morphology. We also review the information these fossils have provided about the earliest evolution of the mollusc shell. Our long-term goal is to create a dataset of microstructures in early molluscs, which will be useful in understanding the incipient evolutionary arms race between molluscs and their predators, and will help elucidate how the mollusc biomineralization toolkit was built through time.
TL;DR: In this article, the most recent and innovative contributions and research trends arounbd the wide issue of energy efficiency in buildings by means of passive techniques, such as new effective materials for building envelope optimization.
Abstract: This chapter shows the most recent and innovative contributions and research trends arounbd the wide issue of energy efficiency in buildings by means of passive techniques, such as new effective materials for building envelope optimization. In particular, cool materials will be dealt with by considering their capability to keep a surface cooler than other solutions when exposed to solar radiation. Then multifunctional materials such as thermal and acoustic insulation panels will be analyzed. Finbally, natural and biobased solutions for energy saving will be investigated. Each one of these topics will be studied by elaborating a first general assessment of each technique and then by analyzing the most recent contributions and research trends in order to provide a wide perspective of the question that is going to be addressed in this chapter.
TL;DR: In this paper, a review of solutions, errors and mistakes in the project design and execution and their impact on reliability and durability of structures is presented, taking into account quite good maintenance, intensive modernization and greater economic value of the housing stock in Warsaw.
Abstract: The article is a review of solutions, errors and mistakes in the project design and execution and their impact on reliability and durability of structures. Were used the results of inspections of 95 precast residential buildings situated in Warsaw, build in years 1961-1994. Inspections were made in years 2005-2006 and 2014. The summary of author researches [1,2,3,4] shows that the precast concrete prefabricated buildings can achieve real duration of use not less than 100 years. Taking into account quite good maintenance, intensive modernization and greater economic value of the housing stock in Warsaw can be assumed that their service lives may reach 120-150 years.
TL;DR: In this article, the authors describe various deep eutectic solvents, which can be used for pretreatment of biomass, which is possible with following purification to obtain products in higher yields and purity.
Abstract: In the field of green chemistry is the study of new solvent systems the great challenge. Deep eutectic solvents (DESs) represent the principles of green chemistry. Currently are preferred these new types of chemicals suitable for the selective removal of extractives, lignin or polysaccharides from biomass. Biomass is selectively treated to the individual fractions, of which is possible with following purification to obtain products in higher yields and purity. In this work are describes various deep eutectic solvents, which can be used for pretreatment of biomass.
TL;DR: In this paper, the authors investigated contributing factors of the eco-efficiency of thermal insulation materials to support decision making of material manufacturers and found that the contribution of electricity and heat within the production process was large for foam glass which had the highest potential to improve the eco efficiency which was by factor 1.72.
Abstract: Thermal insulation material is an important component to reduce the environmental impact of buildings through the reduction of energy consumption in the operation phase. However, the material itself has embodied environmental impacts for the value it provides. Eco-efficiency is a method that quantifies relation between the environmental performance and the created value of a product system. This study investigated contributing factors of the eco-efficiency of thermal insulation materials to support decision making of material manufacturers. For the improvement of eco-efficiency, the assessment was made in two scopes: investigating the contributing factors of impact caused at production processes; and thermal performance through thermo-physical properties. For quantifying environmental impacts, cradle-to-grave life cycle assessment (LCA) of each materials were made. The life cycle impact assessment (LCIA) indicators used were ReCiPe H/A and global warming potential (GWP100a). For the assessment of production process, the inventories of the materials were assigned to six categories: heat, chemicals, electricity, transportation, raw materials and wastes. Among the assessed materials, contribution of electricity and heat within the production process was large for foam glass which had the highest potential to improve the eco-efficiency which was by factor 1.72. The analysis on relation between thermo-physical properties and eco-efficiency based on product data of the materials highlighted the importance of density as an indicator upon development and use. Although density often gains less attention, the finding suggested the effectiveness of improving the efficiency by having lower density without compensating the performance of the materials.
TL;DR: In this article, the most critical parameter of palm oil mill effluent (POME) is chemical oxygen demand (COD mg/L), the adsorption of COD from raw POME using activated cow bone powder has been investigated.
Abstract: The most critical parameter of palm oil mill effluent (POME) is chemical oxygen demand (COD mg/L). The adsorption of COD mg/L from raw POME using activated cow bone powder has been investigated. The raw POME contains 4.786 g/L of COD, which has to be treated effectively before discharge. Batch experiments were conducted at fixed condition of pH, contact time and speed at different weight dosages for different particle sizes of 75, 150 and 300μm. The result obtained showed a similar adsorption pattern for the particle sizes, the optimum removal was obtained at 150 μm at 0.025g/L with 71% removal efficiency, there was no further significant diference after the adsorption at this stage. The BET adsorption model was adopted to describe the experimental isotherm and isotherm constants for the optimum particle size. The equilibrium data fitted well to the BET model. The hydrophobic behaviour of the CBP proved by the WDPT analysis influenced the removal of COD mg/L on CBP.
TL;DR: In this paper, the authors investigated six different levels of uniaxial compressive stress on cubes and four different levels on slabs and found that loaded specimens are more susceptible to fire spalling than unloaded specimens, with increasing amount of spalling for higher values of applied load.
Abstract: Fire poses one of the most severe environmental conditions that can act on concrete structures as an external load and can induce severe damages (cracks, spalling) or even lead to collapse. Fire spalling of concrete is a complex phenomenon, which might occur due to pressure build-up in the pores, thermal and load-induced stresses. In this context, ordinary concrete specimens (B40-II and B40-III: fc28days ≈ 40 MPa) were exposed to standard fire curve (ISO 834-1), while a constant uniaxial or biaxial compressive load was applied. Six different levels of uniaxial compressive stress on cubes and four different levels of biaxial compressive stress on slabs have been investigated. The test results showed that loaded specimens are more susceptible to spalling than unloaded specimens, with increasing amount of spalling for higher values of applied load. It has been found that biaxially loaded specimens are more prone to spalling than uniaxially loaded specimens. B40-II concrete (3% of slag) exhibited higher spalling than the B40-III concrete (43% of slag).
TL;DR: In this article, a Hygro-thermo-chemical (HTC) model and the Lattice Discrete Particle Model (LDPM) with aging effects for concretes at various early ages are presented.
Abstract: For decades, concrete plays an important role worldwide as a structural material. Construction planning and reliability assessment require a thorough insight of the effects that determine concrete lifetime evolution. This study shows the experimental characterization as well as the results of subsequent aging simulations utilizing and coupling a Hygro-thermo-chemical (HTC) model and the Lattice Discrete Particle Model (LDPM) with aging effects for concretes at various early ages. The HTC component of the computational framework allows taking into account any form of environmental curing conditions as well as known material constituents and predicts the level of concrete maturity. Mechanical response and damage are captured by the well-established LDPM, which is formulated in the framework of discrete meso-scale constitutive models. The chemo-mechanical coupling is accomplished by a set of aging functions that link the meso-scale material properties to an effective aging degree, accounting for cement hydration, silica fume reaction, polymerization, and temperature effects. After introducing the formulations the framework is applied to experimental data of 3 standard low and higher strength concretes. Investigated tests include two types of unconfined compression, Brazilian splitting, three-point-bending, and wedge splitting. Following the model calibration the framework is validated by purely predictive simulations of structural level experimental data obtained at different ages for the same concretes.
TL;DR: In this article, the quality of WCO by the determination of the WCO parameter with the performance of W CO in modified binder by physical and rheological binder testing is analyzed.
Abstract: Oxidation, hydrolysis and polymerization process during frying activity has caused the alteration value of the waste cooking oil (WCO) properties which is acid value and water content. This parameter is recognized as the quality measurement of waste cooking oil that might be affecting the performance of WCO in binder modification. Therefore, the aim of this paper is to relate the quality of WCO by the determination of the WCO parameter with the performance of WCO in modified binder by physical and rheological binder testing. Based on the finding, the high and good quality of WCO is recorded in December sample with the lowest acid value (1.66 mL/g) and water content (0.01 ml). The high quality of WCO affected the good performance of rheological properties where the higher rutting resistance and temperature failure at 64 °C is achieved by the modified asphalt binder with the addition of WCO in December sample.
TL;DR: Advanced reliability model of dual-disk RAID-1 array based on Markov chains, which takes into consideration finite time of disk replacement after disk failure, different disk failure rate in array’s normal and rebuild states, and probability of read errors during array rebuild procedure, are overviewed.
Abstract: This paper deals with data storage systems based on fault-tolerant dual-disk RAID-1, which are widely used as high-reliable data storage systems and have acceptable overhead expenses in hardware implementation. Advanced reliability model of dual-disk RAID-1 array based on Markov chains, which takes into consideration finite time of disk replacement after disk failure, different disk failure rate in array’s normal and rebuild states, and probability of read errors during array rebuild procedure, are also overviewed in this paper. Mathematical solution of reliability model, calculation formula for mean time to data loss, estimation of disk and array reliability parameters and MTTDL calculation example are also provided.
TL;DR: In this paper, a composites material composed of polymethyl methacrylate (PMMA) reinforced ZrO2-Al2O3-SiO2 filler system was developed.
Abstract: In this study, novel composites materials composed of polymethyl methacrylate (PMMA) reinforced ZrO2-Al2O3-SiO2 filler system were developed. Zirconia-alumina-silica filler system were synthesized through sol-gel technique. Chitosan and trimethoxypropilsilane (TMPS) were used to modify the composites system. The resulting composites material were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD) and hardness test. SEM images displayed the composites particles in nanometer size with minor agglomeration. The XRD results revealed the presence of cubic and tetragonal phase of zirconia and also monoclinic silica phases in the composites system. These crystallographic characteristic could affect the mechanical properties of the composites. The hardness value for un-modified composites was 15.27 ± 0.25 VHN and for TMPS 19.43 ± 1.89 VHN and chitosan modification 18.75 ± 2.05 VHN, respectively. Therefore, these novel composites materials composed of PMMA reinforced filler system of zirconia-alumina-silica would provide the potential to apply in dental technology.
TL;DR: In this paper, the possibility of studying composite materials by non-destructive laser-ultrasonic testing technique was discussed, and the internal structure of the samples was visualized in 2D images.
Abstract: This paper discusses the possibility of studying composite materials by non-destructive laser-ultrasonic testing technique. Concrete samples and carbon-epoxy composites were examined, defects located and elastic wave velocities measured. The internal structure of the samples was visualized in 2D images.
TL;DR: In this paper, a Gleeble materials thermo-mechanical simulator was used to conduct uniaxial tensile testing of AA6082 under solution heat treatment, forming and in-die quenching (HFQ®) conditions.
Abstract: For a metal forming process, the uniaxial tensile properties of a material are the most fundamental and important properties to investigate. Solution heat treatment, forming and in-die quenching (HFQ®) is a patented process to form complex shape panel components using aluminium alloys at high efficiency and low cost. A Gleeble materials thermo-mechanical simulator was used to conduct uniaxial tensile testing of AA6082 under HFQ® conditions. A set of grips were specially designed to reduce the heat loss of specimen during testing in a Gleeble and allow the strain measurement by using digital image correlation (DIC) system. A large dog-bone specimen with parallel length of 80mm was designed to minimise the temperature gradient along the gauge section. Temperature gradient was measured and uniaxial tensile tests were conducted at the range of deformation temperature of 350-535 °C and the range of strain rate of 0.1-4 /s. The uniaxial tensile properties of AA6082 at different temperatures and strain rates under HFQ® conditions were summarised and the viscoplastic response of the material was discussed.
TL;DR: In this paper, a new type of high-performance Portland cement based composite applicable for number of practical utilization is introduced, the fundaments of performed research was to design mixture with controlled process of hydration, easy production, suitable time of setting, good workability and rapid evolution of mechanical properties as well as satisfactory long-term stability of hardened composite.
Abstract: The paper introduces development of new type of high-performance Portland cement based composite applicable for number of practical utilization. The fundaments of performed research was to design mixture with controlled process of hydration, easy production, suitable time of setting, good workability and rapid evolution of mechanical properties as well as satisfactory long-term stability of hardened composite. Selected mixture were evaluated by means of mechanical properties and volume changes determination.