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Field survey and laboratory tests on composite materials case of GRP (Glass Fiber Reinforced Polyester) tubes for water suply  [PDF]
Radu Hariga,Andrei Du??,Florentina Luca
Urbanism. Arhitectura. Constructii , 2013,
Abstract: In the Moldova land, were made two lines of water adduction, having 6000 m length and 40 m slope, or 1/150 slope. The water supply component tubes were disposed under the plant: The tubes are made of glass – reinforced thermosetting plastics (GRP). After about 180 days of operation, one of the lines showed severe deterioration of the quality pipe components. This paper deals with some laboratory tests in order to detect the failure cases of the pipelines components.
Development of textile-reinforced carbon fibre aluminium composites manufactured with gas pressure infiltration methods  [PDF]
W. Hufenbach,M. Gude,A. Czulak,J. ?leziona
Journal of Achievements in Materials and Manufacturing Engineering , 2009,
Abstract: Purpose: The aim of his paper is to show potential of textile-reinforced carbon fibre aluminium composite with advantage of the lightweight construction of structural components subjected to thermo-mechanical stress.Design/methodology/approach: The manufacture of specimens of the carbon fibre-reinforced aluminium was realised with the aid of an advanced differential gas pressure infiltration technique, which was developed at ILK, TU Dresden.Findings: The gas pressure infiltration technology enables to fabricate complex carbon aluminium composites with fibre or textile reinforcement using moulds of graphite, but in future development the optimization of infiltration process is required. The load-adapted combination of 3D reinforced semi-finished fibre products (textile preforms) made from carbon fibres (CF) with aluminium light metal alloys (Al) offers a considerable lightweight construction potential, which up to now has not been exploited.Research limitations/implications: Gas pressure infiltration technology enables to fabricate complex carbon aluminium composites with fibre or textile reinforcement using precision moulds of graphite, but in future development the optimization of infiltration process is required.Practical implications: Load-adapted CF/Al-MMC, due to the relatively high stiffness and strength of the metal matrix, allow the introduction of extremely high forces, thereby enabling a much better exploitation of the existing lightweight construction potential of this material in comparison to other composite materials.Originality/value: Constantly rising demands on extremely stressed lightweight structures, particularly in traffic engineering as well as in machine building and plant engineering, increasingly require the use of endless fibre-reinforced composite materials which, due to their selectively adaptable characteristics profiles, are clearly superior to conventional monolithic materials.
Zinc Sulfide Tubes Reinforced with Carbon Nanofibers  [PDF]
N. N. Kolesnikov,D. N. Borisenko,E. B. Borisenko,A. V. Timonina,V. V. Kveder
Journal of Nanomaterials , 2009, DOI: 10.1155/2009/126354
Abstract: Zinc sulfide submicron and nanotubes with outer diameters in the range from 100 to 1000 nm were produced through chemical deposition from vapor under argon pressure. The novel process provides formation of ZnS tubes reinforced with carbon nanofibers. This is the first time that the ZnS tubes are grown with fibers during deposition.
Function-Integrative Textile Reinforced Concrete Shells  [PDF]
Sandra Gelbrich, Henrik L. Funke, Lothar Kroll
Open Journal of Composite Materials (OJCM) , 2018, DOI: 10.4236/ojcm.2018.84013
Abstract:
This paper presents the development and technological implementation of textile reinforced concrete (TRC) shells with integrated functions, such as illumination and light control. In that regard the establishment of material, structural and technological foundations along the entire value chain are of central importance: From the light-weight design idea to the demonstrator and reference object, to the technological implementation for the transfer of the research results into practice. The development of the material included the requirement-oriented composition of a high-strength fine grained concrete with an integrated textile reinforcement, such as carbon knitted fabrics. Innovations in formwork solutions provide new possibilities for concrete constructions. So, a bionic optimized shape of the pavilion was developed, realized by four connected TRC-lightweight-shells. The thin-walled TRC-shells were manufactured with a formwork made of glass-fibre reinforced polymer (GFRP). An advantage of the GFRP-formwork is the freedom of design concerning the formwork shape. Moreover, an excellent concrete quality can be achieved, while the production of the precast concrete components is simple and efficient simultaneously. After the production the new TRC-shells were installed and assembled on the campus of TU-Chemnitz. A special feature of the research pavilions are the LED light strips integrated in the shell elements, providing homogeneous illumination.
A Level-Set Based Representative Volume Element Generator and XFEM Simulations for Textile and 3D-Reinforced Composites  [PDF]
Bernard Sonon,Thierry J. Massart
Materials , 2013, DOI: 10.3390/ma6125568
Abstract: This contribution presents a new framework for the computational homogenization of the mechanical properties of textile reinforced composites. A critical point in such computational procedures is the definition and discretization of realistic representative volume elements (RVEs). A geometrically-based weave generator has been developed to produce realistic geometrical configurations of the reinforcing textile. This generator takes into account the contact conditions between the yarns in the reinforcement by means of an iterative scheme, accommodating the tension in the yarns in an implicit manner. The shape of the cross sections of the yarns can also be adapted as a function of the contact conditions using a level set-based post-processor. This allows a seamless transition towards an extended finite element (XFE) scheme, in which the obtained reinforcement geometry is subsequently exploited to derive the mechanical properties of the composite system using computational homogenization.
Development of a Helmet Test Rig for Continuously Textile Reinforced Riot Helmets
International Journal of Textile Science , 2013, DOI: 10.5923/j.textile.20130201.03
Abstract: This paper is a part of research carried out for the manufacturing and evaluation of riot police helmet having continuous textile reinforcement. Successful technique was developed for the manufacturing on single-piece continuously textile reinforced riot helmet shells. In order to fulfil the objective of in-house impact testing on the developed continuously textile reinforced helmets,a helmet test rig was made. The University of Manchester’s drop weight impact testing instrument was used and successfully modified for helmet testing.The importance of the developed test rig was the sufficient abilities to carry out impact testing at different impact position at the helmet shell, force blocking effectiveness at different locations can be calculated and the behaviour of the transmitted force at different impact locations can be understood. Furthermore, energy absorption at different impact location can also be studied.
FRP编织网/ECC复合加固钢筋混凝土圆柱力学性能的试验研究
Experimental study on mechanical behaviour of circular reinforced concrete columns strengthened with FRP textile and ECC
 [PDF]

朱忠锋,王文炜
- , 2016, DOI: 10.3969/j.issn.1001-0505.2016.05.031
Abstract: 考虑纤维编织网表面处理、层数和ECC施工工艺等因素,对FRP编织网/ECC复合增强钢筋混凝土圆柱进行了静力轴向受压试验,研究了加固柱的承载力和变形能力.在试验研究的基础上,利用有限元软件建立了加固柱的数值分析模型.试验结果表明,加固柱的破坏形态为BFRP编织网断裂;随着编织网层数的增加,加固柱的极限荷载和变形性能均有所提高;FRP编织网经过表面处理后,显著地改善了与ECC的界面黏结性能和共同工作性能;涂抹ECC和喷射ECC与FRP编织网形成的复合加固层,均能对核心钢筋混凝土柱提供有效的侧向约束应力,延缓了纵筋的屈服.计算结果表明,利用所建立的非线性有限元模型,可以有效地预测加固柱的极限荷载和受力性能.
Considering the cured surface and layers of fiber reinforced polymer(FRP)textile and construction technology of engineered cementitious composite(ECC), the static axial compressive experiment on circular reinforced concrete(RC)columns strengthened with FRP textile and ECC was carried out to study the loading and deformation capacities of RC column. Based on experimental results, the numerical analysis model was established using the finite element software. Experimental results show that all strengthened RC columns fail by the rupture of BFRP textile, the ultimate compressive strength and deformation capacity of confined RC columns are enhanced with the reinforced layer of FRP textile increasing. After surface treatment, the bonding behavior and the compatibility of FRP textile and ECC interface are significantly improved. Besides, the composite strengthened layer combined with both smeared and sprayed ECC strengthening and FRP textile can provide effective lateral confining stress to the strengthened RC columns and delay the yielding of longitudinal reinforced steel rebar. The analytical results show that the ultimate compressive strength and the deformation capacity of the strengthened RC columns can be predicted by using the nonlinear finite element model
Unsymmetrical Fibre-Reinforced Plastics for the Production of Curved Textile Reinforced Concrete Elements  [PDF]
Henrik L. Funke, Sandra Gelbrich, Andreas Ehrlich, Lars Ulke-Winter, Lothar Kroll
Open Journal of Composite Materials (OJCM) , 2014, DOI: 10.4236/ojcm.2014.44021
Abstract: A new constructive and technological approach was developed for the efficient production of large-dimensioned, curved freeform formworks, which allow the manufacturing of single and double-curved textile reinforced concrete elements. The approach is based on a flexible, multi-layered formwork system, which consists of glass-fibre reinforced plastic (GFRP). Using the unusual structural behavior caused by anisotropy, these GFRP formwork elements permit a specific adjustment of defined curvature. The system design of the developed GFRP formwork and the concrete-lightweight-elements with stabilized spacer fabric was examined exhaustively. Prototypical curved freeform surfaces with different curvature radii were designed, numerically computed and produced. Furthermore, the fabric’s contour accuracy of the fabric was verified, and its integration was adjusted to loads.
Mechanical Properties of Lightweight Concrete Partition with a Core of Textile Waste  [PDF]
Kamran Aghaee,Mohammad Foroughi
Advances in Civil Engineering , 2013, DOI: 10.1155/2013/482310
Abstract: This investigation is focused on bending experiment of some prismatic perlite lightweight concrete. In these samples, textile waste fibers are confined with textile mesh glass fiber and embedded in the central part of cubic lightweight concrete specimens. Bending experiments revealed that lightweight concrete panels with a core of textile waste fiber have less density than water and high energy absorption and ductility. Furthermore, these composite panels by having appropriate thermal insulation characteristics could be used for partitioning in the buildings. 1. Introduction In advanced industrialized countries, the utilization of fibers in concrete began in the early 1960s [1]. The type and form of fibers and also the construction of fiber-reinforced concrete (FRC) have improved significantly during the past five decades, and their employment have been on the rise [2, 3]. Improving the mechanical properties of concrete using the random distribution of fibers in it has been the topic of interest of numerous research studies [3–7]. Between 1994 and 2011, Wang et al. carried out several research efforts on adding carpet waste fibers to concrete and soil. In this research, the old carpets were transformed into fibers. These fibers were not necessarily of the same size and were actually used in many different shapes and sizes in concrete and soil. After compressive and bending experiments, the results showed that the usage of waste fibers had significant effects on the resistance of failure, stiffness, and ductility of concrete. The usage of this cheap waste in concrete has also increased the durability of concrete [8–10]. In recent years, dos Reis et al. examined the mechanical properties of FRC with textile waste fibers. In this research, the textile wastes of Nova Friburgo industry, located in Rio de Janeiro in Brazil, were used. The general purposes of this research were exploring the mechanical properties of reinforced polymer concrete and best use of textile waste fibers considering increased production of this kind of waste in Brazil. On an overall result, it was stated that the cutting waste textile fibers mixed with polymer concrete produce a unique composite material which had lower flexural and compressive characteristics as compared to unreinforced polymer concrete. Using these textile wastes in concrete lead to a smoother failure, unlike brittleness failure behavior of unreinforced polymer concrete. Furthermore, the usage of textile waste may solve the problems like environmental pollution and provision of an alternative material for the
Infared image inspection of ground hydraulic constructions slopes fastening reinforced concrete slabs (rus)
Shtengel V.G.,Nedyalkov V.S.
Magazine of Civil Engineering , 2011,
Abstract: Non-metallic building structures nondestructive examination methods using is an essential requirement for conducting a technical inspection of existing constructions. The technique of applying the nondestructive examination method for thermal control of one of the most common constructions of hydraulic structures – reinforced concrete fastening slopes of ground facilities (dams, canals, etc.) is considered in this article. The aim of this method is to identify areas of slabs, detached from subgrade. It is shown that the optimal decision includes synchronized analysis of the thermograms and the visible areas of the slopes detachment recording. This decision reduces the number of the thermal field areas false anomalies caused by the local features of concrete surface layer and by background effects. During the results analyzing false anomalies of the constructions thermal field areas must be considered and rejected. These anomalies can be related with the concrete surface layer condition or the proximity of masking factors: water, vegetation, etc. In the example of full-scale 6.8 km long dam examination the false thermograms anomalies were more than 50% from the total number of tested plates.
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