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Gotowe bibliografie tematyczne / Fibre durability

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Gotowa bibliografia na temat „Fibre durability”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Fibre durability"

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Liu, Yanzhu, Liang Wang, Ke Cao i Lei Sun. "Review on the Durability of Polypropylene Fibre-Reinforced Concrete". Advances in Civil Engineering 2021 (4.06.2021): 1–13. http://dx.doi.org/10.1155/2021/6652077.

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Polypropylene fibre (PPF) is a kind of polymer material with light weight, high strength, and corrosion resistance. The crack resistance of concrete can be improved by adding PPFs. PPF can optimize the pore size distribution of concrete. As a result, the durability of concrete is significantly enhanced since PPF can block the penetration of water or harmful ions in concrete. This paper summarizes the influence of polypropylene fibre on the durability of concrete, including drying shrinkage, creep, water absorption, permeability resistance, chloride ion penetration resistance, sulfate corrosion resistance, freeze-thaw cycle resistance, carbonation resistance, and fire resistance. The authors analysed the effects of fibre content, fibre diameter, and fibre hybrid ratio on these durability indexes. The durability property of concrete can be further improved by combining PPFs and steel fibres. The drawbacks of PPF in application in concrete are the imperfect dispersion in concrete and weak bonding with cement matrix. The methods to overcome these drawbacks are to use fibre modified with nanoactive powder or chemical treatment. At last, the authors give the future research prospects of concrete made with PPFs.

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Wang, Peng. "Research on the Design and Use of Structures and Components Made from Fibre Composite Materials". Applied Mechanics and Materials 174-177 (maj 2012): 782–86. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.782.

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Fibres composite materials designed as glass fibre, carbon fibre and aramid fibre. They were used for chemical resistance, compressive strength, stiffness, impact resistance, and fire resistance. However, they had a number of limitations, including vandalism, accidental damage, short-term durability, high cost, and suitably qualified staff shortage. These problems could be solved by appropriate monitoring, suitably qualified designers and contractors. The design and use of fibre composite materials has become an important aspect of engineering.

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More, Florence More Dattu Shanker, i Senthil Selvan Subramanian. "Impact of Fibres on the Mechanical and Durable Behaviour of Fibre-Reinforced Concrete". Buildings 12, nr 9 (13.09.2022): 1436. http://dx.doi.org/10.3390/buildings12091436.

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Numerous studies have been conducted recently on fibre reinforced concrete (FRC), a material that is frequently utilized in the building sector. The utilization of FRC has grown in relevance recently due to its enhanced mechanical qualities over normal concrete. Due to increased environmental degradation in recent years, natural fibres were developed and research is underway with the goal of implementing them in the construction industry. In this work, several natural and artificial fibres, including glass, carbon, steel, jute, coir, and sisal fibres are used to experimentally investigate the mechanical and durability properties of fibre-reinforced concrete. The fibres were added to the M40 concrete mix with a volumetric ratio of 0%, 0.5%, 1.0%, 1.5%, 2.0% and 2.5%. The compressive strength of the conventional concrete and fibre reinforced concrete with the addition of 1.5% steel, 1.5% carbon, 1.0% glass, 2.0% coir, 1.5% jute and 1.5% sisal fibres were 4.2 N/mm2, 45.7 N/mm2, 41.5 N/mm2, 45.7 N/mm2, 46.6 N/mm2, 45.7 N/mm2 and 45.9 N/mm2, respectively. Comparing steel fibre reinforced concrete to regular concrete results in a 13.69% improvement in compressive strength. Similarly, the compressive strengths were increased by 3.24%, 13.69%, 15.92%, 13.68% and 14.18% for carbon, glass, coir, jute, and sisal fibre reinforced concrete respectively when equated with plain concrete. With the optimum fraction of fibre reinforced concrete, mechanical and durability qualities were experimentally investigated. A variety of durability conditions, including the Rapid Chloride Permeability Test, water absorption, porosity, sorptivity, acid attack, alkali attack, and sulphate attack, were used to study the behaviour of fiber reinforced concrete. When compared to conventional concrete, natural fibre reinforced concrete was found to have higher water absorption and sorptivity. The rate of acid and chloride attacks on concrete reinforced with natural fibres was significantly high. The artificial fibre reinforced concrete was found to be more efficient than the natural fibre reinforced concrete. The load bearing capacity, anchorage and the ductility of the concrete improved with the addition of fibres. According to the experimental findings, artificial fibre reinforced concrete can be employed to increase the structure’s strength and longevity as well as to postpone the propagation of cracks. A microstructural analysis of concrete was conducted to ascertain its morphological characteristics.

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Akbari Motlagh, Ali, i Ebrahim Mirzaei. "Effect of using Fibre on the Durability of Asphalt Pavement". Civil Engineering Journal 2, nr 2 (1.02.2016): 63–72. http://dx.doi.org/10.28991/cej-2016-00000013.

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Using the fibre additives with a uniform distribution in asphaltic concrete mixture is a well-known technique for improving the mechanical properties and durability of asphalt pavement. The purpose of this study is to investigate the effect of preparing fibre and production of the properties of bitumen and asphalt concrete mixture. In this study, a dense-graded aggregation, mineral fibres (asbestos) and synthetic fibres (polyester and nylon) were used. Laboratory studies were done by comparing different rheological properties, mechanical and moisture susceptibility of mixtures of fibres. Results of the penetration and softening point on mixtures of bitumen – fibre show that fibres improve the mixed rheological properties and stiffening effect of fibre properties. The results of Marshall Tests indicate that adding fibres reduces the strength in Marshall and results in the slight increase in the percentage of optimum bitumen content and asphalt percentage of air voids in comparison with typical fibre. The results of the indirect tensile tests showed that the addition of fibres, depending on the percentage of fibres significantly improves the durability of the mixture.

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Sergi, Claudia, Jacopo Tirillò, Maria Carolina Seghini, Fabrizio Sarasini, Vincenzo Fiore i Tommaso Scalici. "Durability of Basalt/Hemp Hybrid Thermoplastic Composites". Polymers 11, nr 4 (2.04.2019): 603. http://dx.doi.org/10.3390/polym11040603.

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The Achilles heel of thermoplastic natural fibre composites is their limited durability. The environmental degradation of the mechanical properties of hemp and hemp/basalt hybrid-reinforced high-density polyethylene (HDPE) composites has been investigated with a special focus on the effects of water ageing and accelerated ageing, including hygrothermal and UV radiation. Modification of the matrix was carried out using a maleic anhydride high-density polyethylene copolymer (MAPE) as a compatibilizer. Hybridization of hemp fibres with basalt fibres and the incorporation of MAPE were found to significantly decrease the water uptake (up to 75%) and increase the retention of mechanical properties after accelerated ageing. Secondary crystallization phenomena occurring in the composites, as confirmed by differential scanning calorimetry (DSC) analysis, were able to counteract the severe combined effects of hygrothermal stress and UV radiation, with the exception of hemp-fibre composites where permanent damage to the fibres occurred, with 2% and 20% reduction in tensile strength and modulus, respectively, for a 30 wt % hemp fibre-reinforced HDPE.

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Rajak, Manoj, i Baboo Rai. "Effect of Micro Polypropylene Fibre on the Performance of Fly Ash-Based Geopolymer Concrete". Journal of Applied Engineering Sciences 9, nr 1 (1.05.2019): 97–108. http://dx.doi.org/10.2478/jaes-2019-0013.

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Abstract Geopolymer offers significant promise to the construction world as a possible alternative to ordinary Portland cement (OPC). Like conventional Portland cement concrete, the matrix brittleness in geopolymer composites can be reduced by introducing suitable fibre reinforcement. A few investigations on fibre reinforced geopolymer composites are available. However there is still a gap to comprehend and enhance their performance. This paper describes the effect of incorporating micro polypropylene fibres on the strength and durability characteristics of geopolymer concrete. The engineering and durability properties like workability, compressive strength, split tensile strength, flexural strength, modulus of elasticity, and sorptivity of geopolymer concrete reinforced with micro polypropylene fibres is presented. The effect of the sulfuric acid attack on Geopolymer Concrete reinforced with micro polypropylene fibres is also discussed. The results show that hydrophobic characteristics of the micro polypropylene fibre led to weak contact with the geopolymer binder and hence weakened the mechanical performance of the fly ash based geopolymer matrix. However significant improvements in durability properties were noted.

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Bhat, Arooba Rafiq, i Ajay Vikram. "A Literature Study of Hybrid Fibre Reinforced Concrete". International Journal of Innovative Research in Engineering & Management 10, nr 1 (1.02.2023): 6–8. http://dx.doi.org/10.55524/ijirem.2023.10.1.2.

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The drawbacks are that the concrete has been improved by using hybrid fibre in concrete. By hybridization benefits from two different fibres are utilized in a single concrete mixture. The hybrids fibres studied are basalt-polypropylene fibre, polypropylene-steel fibre, steel-coconut fibre, polypropylene-e-waste fibre, polypropylene-polyvinyl Alcohol and steel-glass- polypropylene fibre. The properties that are improved using hybrid fibres are compressive strength, tensile strength, flexural strength, limited crack propagation, and improved durability of the concrete structure. In maximum cases slump value decrease with an increase in fibre percentage.

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Md Azree Othuman Mydin. "Thermal and Durability Properties of Sustainable Green Lightweight Foamed Concrete Incorporating Eco-Friendly Sugarcane Fibre". Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 94, nr 1 (19.04.2022): 60–78. http://dx.doi.org/10.37934/arfmts.94.1.6078.

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Efforts to modify cement-based mixtures have always enticed the interest of researchers. Lightweight foamed concrete is immensely porous, and its properties diminish with increasing in the number of pores. To enhance its properties, the solid matrix of LFC can be attuned by integrating numerous natural fibres. The influence of eco-friendly sugarcane fibre in LFC was not investigated before in the current body of knowledge. Hence, there is some ambiguity considering the mechanism by which and the extent to which the sugarcane fibre can influence LFC properties. Therefore, this study concentrates on distinguishing the potential use of sugarcane fibre into lightweight foamed concrete. This study aims to determine the durability and thermal properties of LFC with the addition of sugarcane fibre. Low density of 800kg/m3 were cast and tested. Different weight fractions of sugarcane fibre of 0.15%, 0.30%, 0.45% and 0.60% were used. For durability properties, four parameters were appraised such as water absorption capacity, porosity, drying shrinkage, ultrasonic pulse velocity. While for thermal properties were assessed which were thermal conductivity, thermal diffusivity and specific heat capacity. Protein-based foaming agent Noraite PA-1 was utilized to produce the desirable density of LFC. To get the comparable results, the water to cement ratio was fixed to 0.45 while the cement to sand ratio constant at 1:1.5. The results had indicated that the addition of 0.45% of sugarcane fibre gave the optimum results for all the durability and thermal properties considered in this research. At 0.45% weight fraction of SF, the fibres and the cementitious matrix achieved maximum compaction, which stemmed in excellent mix homogeneity. Beyond the optimum level of sugarcane fibre inclusion, agglomeration and the non-uniform dispersion of fibres was observed, which led to decrease in entire durability and thermal properties appraised.

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Abdullah, Muhd Afiq Hizami, Mohd Zulham Affandi Mohd Zahid, Badorul Hisham Abu Bakar, Fadzli Mohamed Nazri i Afizah Ayob. "UHPFRC as Repair Material for Fire-Damaged Reinforced Concrete Structure – A Review". Applied Mechanics and Materials 802 (październik 2015): 283–89. http://dx.doi.org/10.4028/www.scientific.net/amm.802.283.

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Exposure of concrete to intense heat will cause deterioration of its strength and durability. Previously, the fire-damaged concrete was repaired using the shotcrete and normal concrete. Recent studies utilize fibre reinforced polymer (FRP) in repairing fire-damaged concrete. Ultra High Performance Fiber Reinforced Concrete (UHPFRC) mostly developed using fine size aggregate, cement, silica fume, super plasticizer and reinforced with steel fibre has an excellent mechanical properties compared to high strength concrete and with an addition of steel fibre in the UHPFRC enhances its ductility behaviour which is not possessed by normal concrete, hence, UHPFRC indicates a promising candidate as repair material to fire-damaged concrete. The aim of this paper is to review on the properties of UHPFRC to be utilized as repair material to fire-damaged concrete structure based on previous research on UHPFRC and fire-damaged structure.

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Augustino, Daudi Salezi, Richard Ocharo Onchiri, Charles Kabubo i Christopher Kanali. "Mechanical and Durability Performance of High-Strength Concrete with Waste Tyre Steel Fibres". Advances in Civil Engineering 2022 (20.06.2022): 1–16. http://dx.doi.org/10.1155/2022/4691972.

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Concrete with various fibres has been in practice over the years now to improve the internal characteristics of concrete. In most of the developing countries, there is a high rate of waste tyres due to the importation of used cars. Waste tyres increase the environmental burden due to their resistance to decomposition in landfills. To have alternative disposal of waste tyres, their components of steel fibres were utilized in concrete to assess their effect on the mechanical and durability performance of high-strength concrete with a target mean strength of 70 MPa. Fibres had a diameter of 1.3 mm and lengths of 30, 50, and 60 mm with fibre contents of 0.3, 0.5, 0.75, and 1.0% in each length. Slump tests were performed on fresh concrete with and without fibres. The mechanical performance variables assessed were compressive strength, splitting tensile strength, flexural strength, flexural toughness, residual strength, static modulus, and Poisson’s ratio. In addition, durability tests such as chloride ion penetration and absorption rate of water were investigated. The results showed that an increase in fibre length to 60 mm and a 1.0% fibre content resulted in the high bond strength in the concrete matrix resulting in a smaller crack width. Moreover, these fibre length and content resulted in improved tensile and flexural strength to 21.5% and 71.1% of control mix, respectively. The increase in fibre length and content affected both the durability properties and the flowability of the concrete, and as for length (60 mm) and 1% content, concrete had a slump of 77.8% lesser compared to the control mix. The compressive strength was improved to 15.2% for concrete with a fibre length of 50 mm and a fibre content of 0.5%. However, further increases in fibre content and length caused an increase in the number of weaker interfacial transition zones at the composite interface that reduces compressive stiffness, resulting in low compressive strength. Furthermore, the reduced fibre content and length (30 mm) improve the static modulus linearly up to 0.75% fibre content; however, concrete with a fibre length of 50 mm and content of 0.3% gives the best results.

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Rozprawy doktorskie na temat "Fibre durability"

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Fisher, Alex K. "Durability design parameters for cellulose fibre reinforced concrete pipes in aggressive environments". Thesis, Queensland University of Technology, 2003.

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Levin, Klas. "Durability of Embedded Fibre Optic Sensors in Composites". Doctoral thesis, Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3145.

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Gurusamy, K. "The marine durability of steel fibre reinforced concrete". Thesis, University of Aberdeen, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234802.

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Nordström, Erik. "Durability of sprayed concrete : steel fibre corrosion in cracks /". Luleå, 2005. http://epubl.luth.se/1402-1544/2005/02.

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Nordström, Erik. "Steel fibre corrosion in cracks : durability of sprayed concrete". Licentiate thesis, Luleå tekniska universitet, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18249.

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Steel fibre reinforced sprayed concrete is common practice for permanent linings in underground construction. Today there is a demand on "expected technical service life" of 120 years. Thin steel fibres could be expected to discontinue carrying load fast with a decrease of fibre diameter caused by corrosion, especially in cracks. The thesis contains results from inspections on existing sprayed concrete structures and a literature review on corrosion of steel fibres in cracked concrete. To study the mechanisms ruling inititation and propagation of corrosion both field exposure tests and accelerated laboratory exposure tests with cracked steel fibre reinforced sprayed concrete have been performed. Parameters tested are type of spraying method, exposure environment, fibre length, usage of accelerators, crack width and time of exposure. A discussion on how the influence of corrosion on load bearing capacity should be considered in a service-life model is also presented.
Godkänd; 2000; 20070317 (ysko)

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Homam, Sayed Mukhtar. "Durability of fibre-reinforced polymers (FRP) used in concrete structures". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0023/MQ50345.pdf.

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De, Klerk Marthinus David. "The durability of natural sisal fibre reinforced cement-based composites". Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96895.

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Thesis (MEng)--Stellenbosch University, 2015.
ENGLISH ABSTRACT: The building industry is responsible for a substantial contribution to pollution. The production of building materials, as well as the operation and maintenance of structures leads to large amounts of carbon-dioxide (CO2) being release in the atmosphere. The use of renewable resources and construction materials is just one of the ways in which the carbon footprint of the building industry can be reduced. Sisal fibre is one such renewable material. Sisal fibre is a natural fibre from the Agave Sisalana plant. The possibility of incorporating sisal fibre in a cement-based matrix to replace conventional steel and synthetic fibres has been brought to the attention of researchers. Sisal fibre has a high tensile strength in excess of polypropylene fibre and comparable to PVA fibre. Sisal fibre consists mainly of cellulose, hemi-cellulose and lignin. The disadvantage of incorporating sisal fibre in a cement-based matrix is the degradation of the composite. Sisal fibres tend to degrade in an alkaline environment due to changes in the morphology of the fibre. The pore water in a cement base matrix is highly alkaline which leads to the degradation of the fibres and reduced strength of the composite over time. Sisal fibre reinforced cement-based composites (SFRCC) were investigated to evaluate the durability of the composites. Two chemical treatments, alkaline treatment and acetylation, were performed on the fibre at different concentrations to improve the resistance of the fibre to alkaline attack. Alkaline treatment was performed by using sodium hydroxide (NaOH), while acetylation was performed by using acetic acid or acetic anhydride. Single fibre pull-out (SFP) tests were performed to evaluate the influence of chemical treatment on fibre strength, to study the fibre-matrix interaction and to determine a critical fibre length. A matrix consisting of ordinary Portland cement (OPC), sand and water were used for the SFP tests. This matrix, as well as alternative matrices containing fly ash (FA) and condensed silica fume (CSF) as supplementary cementitious material, were reinforced with 1% sisal fibre (by volume) cut to a length of 20 mm. The OPC matrix was reinforced with untreated- and treated fibre while the alternative matrices were reinforced with untreated fibre. Alternative matrices containing varying fibre volumes and lengths were also produced. Three-point bending- (indirect), direct tensile- and compression tests were performed on specimens at an age of 28 days to determine the strength of the matrix. The remainder of the specimens were subjected to ageing by extended curing in water at 24˚C and 70˚C respectively and by alternate cycles of wetting and drying, after which it was tested at an age of 90 days from production to evaluate the durability of the fibre. An increase in fibre volume led to a decrease in compressive strength and peak tensile strength. The optimum fibre length at a volume of 1% was 20 mm for which the highest compression strength was recorded. The combination of alkali treatment and acetylation was the most effective treatment condition, followed by alkali treatment at low concentrations of sodium hydroxide. At higher concentrations of sodium hydroxide, a significant reduction in strength was recorded. The addition of supplementary cementitious materials also proved to be effective in mitigating degradation, especially in the cases where CSF was used. FA proved to be less effective in reducing the alkalinity of the matrix. However, the use of FA as fine filler resulted in higher strengths. Specimens manufactured by extrusion did not have superior mechanical properties to cast specimens. The conclusion was made that the use of sisal fibre in a cement-based matrix is effective in providing ductile failure. Chemical treatment and the addition of supplementary cementitious materials did improve the durability of the specimens, although degradation still took place.
AFRIKAANSE OPSOMMING: Die boubedryf is verantwoordelik vir 'n aansienlike bydrae tot besoedeling. Die produksie van boumateriale, sowel as die bedryf en instandhouding van strukture lei tot groot hoeveelhede koolstof dioksied (CO2) wat in die atmosfeer vrygestel word. Die gebruik van hernubare hulpbronne en boumateriale is maar net een van die maniere waarop die koolstof voetspoor van die boubedryf verminder kan word. Sisal vesels is 'n voorbeeld van 'n hernubare materiaal. Sisal vesel is 'n natuurlike vesel afkomstig vanaf die Agave Sisalana plant. Die moontlikheid om sisal vesels in 'n sement gebasseerde matriks te gebruik om konvensionele staal en sintetiese vesels te vervang, is tot die aandag van navorsers gebring. Sisal vesel het 'n hoër treksterkte as polipropileen vesels en die treksterkte vergelyk goed met die van PVA vesels. Sisal vesel bestaan hoofsaaklik uit sellulose, hemi-sellulose en lignien. Die nadeel verbonde aan die gebruik van sisal vesels in 'n sement gebasseerde matriks is die degradasie van die komposiet. Sisal vesels is geneig om af te breek in 'n alkaliese omgewing as gevolg van veranderinge wat in die morfologie van die vesel plaasvind. Die water in die porieë van 'n sement gebasseerde matriks is hoogs alkalies wat lei daartoe dat die vesel afgebreek word en die sterkte van die komposiet afneem oor tyd. Sisal vesel versterkte sement gebasseerde komposiete is ondersoek om die duursaamheid van die komposiete te evalueer. Twee chemiese behandelings, alkaliese behandeling en asetilering, is uitgevoer op die vesels teen verskillende konsentrasies om die weerstand van die vesels teen alkaliese aanslag te verbeter. Alkaliese behandeling was uitgevoer met natrium-hidroksied (NaOH) terwyl asetilering met asynsuur en asynsuurhidried uitgevoer is. Enkel vesel uittrek toetse is uitgevoer om die invloed van chemiese behandeling op veselsterkte te evalueer, om die vesel/matriks interaksie te bestudeer en om die kritiese vesellengte te bepaal. 'n Matriks wat uit gewone Portland sement (OPC), sand en water bestaan, is gebruik vir die enkel vesel uittrek toetse. Dieselfde matriks, sowel as alternatiewe matrikse wat vliegas (FA) en gekondenseerde silika dampe (CSF) as aanvullende sementagtige materiaal bevat, is versterk met 1% vesel (by volume) wat 20 mm lank gesny is. Die OPC matriks was versterk met onbehandelde- en behandelde vesels, terwyl die alternatiewe matrikse met onbehandelde vesels versterk is. Matrikse wat wisselende vesel volumes en lengtes bevat het is ook vervaardig. Drie-punt buigtoetse (indirek), direkte trek toetse en druktoetse is uitgevoer op proefstukke teen 'n ouderdom van 28 dae om die sterkte van die matriks te bepaal. Die oorblywende proefstukke is onderwerp aan veroudering deur verlengde nabehandeling in water teen 24˚C en 70˚C onderskeidelik en deur afwissilende siklusse van nat- en droogmaak waarna dit op 'n ouderdom van 90 dae vanaf vervaardiging getoets is om die duursaamheid van die matriks te evalueer. 'n Toename in vesel volume het tot 'n afname in druksterkte en piek treksterkte gelei. Die optimum vesel lengte teen 'n volume van 1% was 20 mm, waarvoor die hoogste druksterkte opgeteken is. Die kombinasie van alkaliese behandeling en asetilering was die mees effektiewe behandeling, gevolg deur alkaliese behandeling by lae konsentrasies natrium-hidroksied. Vir hoë konsentrasies natrium-hidroksied is 'n aansienlike afname in sterkte opgeteken. Die toevoeging van aanvullende sementagtige materiale was ook effektief om die degradadering van die vesels te verminder, veral in die gevalle waar CSF gebruik is. FA was minder effektief om die alkaliniteit van die matriks te verminder. Die gebruik van FA as fyn vuller het nietemin hoër sterkte tot gevolg gehad. Proefstukke wat deur ekstrusie vervaardig is, het nie beter meganiese eienskappe gehad as proefstukke wat gegiet is nie. Daar is tot die gevolgtrekking gekom dat sisal vesel in 'n sement gebasseerde matriks wel effektief is om 'n duktiele falingsmode te voorsien. Chemiese behandeling en die toevoeging van aanvullende sementagtige materiale het die duursaamheid van die proefstukke verbeter, alhoewel degradering steeds plaasgevind het.

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Zhang, J. "The performance and environmental durability of pultruded glass fibre composite rebars". Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/7354.

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The work reported is a study of the performance of pultruded unidirectional glass fibre composite rebars, in order to understand and quantify the environmental degradation of the materials in water and alkali solution with, and without, stress. The rebars have been proposed as possible candidates for replacing reinforcing steel in concrete structures. Firstly, the interfacial strength, mechanical properties and dynamic mechanical properties of the rebar composites were investigated using ILSS and a three point bending test, in conjunction with SEM and dynamic mechanical thermal analysis (DMTA). It was concluded that the surface treatments on glass fibres played a major role in the ILSS of the composites. Likewise, the flexural properties and failure behaviour of the rebars were also affected and all were related to the ILSS values. With increasing ILSS, the flexural strength and modulus increased and the failure features varied from compressive, to mixed compressive-tensile, to tensile. This was because higher interphase strengths delayed the occurrence of fibre microbuckling and increased the instability of glass fibres in the matrix. It was found that the glass transition temperature (Tg), as measured by DMTA, can be used to assess interfacial strength. A strong interphase resulted in a relatively higher Tg (and vice versa). This appears to have been caused by the more efficient transfer of the "restraining effect of glass fibres" on polymer chain mobility. The rate and magnitude of flexural property degradation in alkali solution was similar to that in water, except that at 80°C, the modulus was considerably reduced. This was caused by the corrosion of defect inclusions introduced during rebar manufacturing process. The results suggest that the hydroxyl ions in the alkali solution do not diffuse into the polymer matrix. Addition of alkali into water did not lead to a significant difference in water absorption dynamics and DMTA behaviour of pure Atlac 580 vinylester resin. Thirdly, fractured glass rebars, subjected to stress and water or alkali solution at 40°C, were studied. It was observed that low stresses resulted in relatively planar cracks normal to the applied tensile stress but did not pose significant damage to the interphase. The opposite was true for rebars under high-levels of stress. Alkali solutions accelerated the occurrence of stress corrosion in terms of failure times. It was found that crosslinked vinylester resin exhibited a diphasic structure as detected by modulated temperature differential scanning calorimetry (MDSC). Based on these results, it is proposed that microcracks form in the polymer matrix of the composite (under low stresses) due to the different responses of the two phases to the stress field at crack tips. Microcracking then allows transport of aqueous media into the composite by a percolation process.

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Purnell, Philip. "The durability of glass fibre reinforced cements made with new cementitious matrices". Thesis, Aston University, 1998. http://publications.aston.ac.uk/13285/.

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Matrices with reduced alkalinities and Ca(OH)2 contents are being developed; the aim of this study was to investigate their hydration and interaction with alkali-resistant fibres to determine the factors controlling their long-term durability, and assess the relevancy of accelerated ageing. The matrices studied were: OPC/calcium-sulphoaluminate cement plus metakaolin (C); OPC plus metakaolin (M); blast-furnace slag cement plus a micro-silica based additive (D); and OPC (O). Accelerated ageing included hot water and cyclic regimes prior to tensile testing. Investigations included pore solution expression, XRD, DTA/TG, SEM and optical petrography. Bond strength was determined from crack spacings using microstructural parameters obtained from a unique image analysis technique. It was found that, for the new matrices - pore solution alkalinities were lower; Ca(OH)2 was absent or quickly consumed; different hydrates were formed at higher immersion temperatures; degradation under 65°C immersion was an order of magnitude slower, and no interfilamental Ca(OH)2 was observed. It was concluded that: fibre weakening caused by flaw growth was the primary degradation mechanism and was successfully modelled on stress corrosion/static fatigue principles. OPC inferiority was attributed partly to its higher alkalinity but chiefly to the growth of Ca(OH)2 aggravating the degradation; and hot water ageing although useful in model formulation and contrasting the matrices, changed the intrinsic nature of the composites rather than simply accelerating the degradation mechanisms.

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Henault, Jean-Marie. "Approche méthodologique pour l’évaluation des performances et de la durabilité des systèmes de mesure répartie de déformation : application à un câble à fibre optique noyé dans le béton". Thesis, Paris Est, 2013. http://www.theses.fr/2013PEST1113/document.

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La surveillance des structures de génie civil, afin d'en estimer l'état de santé, est un enjeu majeur pour les maîtres d'ouvrages. Les systèmes de mesures réparties par fibre optique, composés d'un interrogateur connecté à une fibre optique intégrée dans un câble, permettent de mesurer le profil de déformation avec un pas de mesure centimétrique et une portée kilométrique. Ils sont donc adaptés aux structures présentant de grands linéaires ou de grandes surfaces. Mais, avant tout déploiement industriel, il est nécessaire d'en évaluer leurs performances. Du fait de la déformation par cisaillement du revêtement du câble, le profil de déformation mesuré le long de la fibre optique n'est pas strictement identique à celui du matériau environnant. Une méthode, basée sur la mise en œuvre d'essais et de simulations numériques, a été développée afin de caractériser les mécanismes de transfert d'effort du milieu hôte à la fibre optique à travers le revêtement du câble. Cette méthode a été appliquée pour déterminer la réponse mécanique d'un câble particulier noyé dans le béton. Les performances métrologiques d'un système de mesure donné ont été évaluées sur la base d'une analyse d'essais « du laboratoire au terrain ». Cette étude a permis de quantifier les différentes composantes d'incertitude et d'estimer les performances du système de mesure complet. Enfin, le câble, noyé dans le béton, ne peut être remplacé. La connaissance de l'impact du vieillissement sur la réponse mécanique du câble est donc primordiale. Une étude spécifique est menée dont le but est d'estimer la durabilité du câble face aux sollicitations chimique, thermique et mécanique correspondant à une application donnée
Structural Health Monitoring is a key factor in life-cycle management of civil structures. Truly distributed fiber optic sensors, composed by an optoelectronic device paired with an optical fiber in a cable, provide strain profiles over several kilometers with a centimeter resolution. They are thus able to provide relevant information on large structures. However, a preliminary performance assessment is required prior to any industrial application. Due to shear deformation of the cable's protective coating, strain measurements provided by the measuring system may differ from actual strains in the embedding medium. A methodology, based on mechanical tests and modelling, was thus developed to determine the relationship between measured/actual strains. It was applied to determine the mechanical response of a specific cable embedded in concrete. Performance assessment method was applied to a specific measuring system. Tests were carried out under laboratory conditions on the fiber optic cable, out of the concrete medium in a first stage, and then embedded in concrete structures. It enabled to evaluate its components and standard uncertainties. The cable could not be replaced after being embedded in concrete. It is necessary to evaluate the ageing effects on its mechanical properties to use it for a long term period. A specific study was carried out to determine the cable durability under chemical, thermal and mechanical solicitations

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Książki na temat "Fibre durability"

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Nemkumar, Banthia, Benmokrane Brahim, Kharbhari Vistasp, Abanilla M. A i ISIS Canada, red. Durability of fibre reinforced polymers in civil infrastructure. Winnipeg, Man: ISIS Canada Research Network, 2006.

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Wittmann, F., i G. Van Zijl, red. Durability of Strain-Hardening Fibre-Reinforced Cement-Based Composites (SHCC). Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0338-4.

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Wittmann, F. H. Durability of Strain-Hardening Fibre-Reinforced Cement-Based Composites (SHCC). Dordrecht: RILEM, 2011.

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Homam, Sayed Mukhtar. Durability of fibre-reinforced polymers (FRP) used in concrete structures. Ottawa: National Library of Canada, 2000.

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S, Hearle J. W., red. Fibre failure and wear of materials: An atlas of fracture, fatigue, and durability. Chichester, England: Ellis Horwood, 1989.

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Miyano, Yasushi, red. Durability of Fiber-Reinforced Polymers. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2017. http://dx.doi.org/10.1002/9783527811984.

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Grace, Nabil F. Environmental/durability evaluation of FRP composite strengthened bridges. Southfield, Mich: Lawrence Technological University, Civil Engineering Dept., 2003.

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Chamis, C. C. Designing for fiber composite structural durability in hygrothermomechanical environments. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, 1985.

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Chamis, C. C. Designing for fiber composite structural durability in hygrothermomechanical environments. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, 1985.

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Chamis, C. C. Designing for fiber composite structural durability in hygrothermomechanical environments. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, 1985.

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Części książek na temat "Fibre durability"

1

Ogawa, Atsuhisa, i Hideki Hoshiro. "Durability of Fibres". W Durability of Strain-Hardening Fibre-Reinforced Cement-Based Composites (SHCC), 81–88. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-94-007-0338-4_6.

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Low, It-Meng, Thamer Alomayri i Hasan Assaedi. "Moisture Absorption and Durability". W Cotton and Flax Fibre-Reinforced Geopolymer Composites, 147–76. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2281-6_5.

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Muhle, H., B. Bellmann i F. Pott. "Durability of Various Mineral Fibres in Rat Lungs". W Mechanisms in Fibre Carcinogenesis, 181–87. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-1363-2_17.

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Oh, Byung H., i Petr Kabele. "Durability under Chemical Loads". W Durability of Strain-Hardening Fibre-Reinforced Cement-Based Composites (SHCC), 41–58. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-94-007-0338-4_3.

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Toledo Filho, Romildo D., Eduardo M. R. Fairbairn i Volker Slowik. "Durability under Thermal Loads". W Durability of Strain-Hardening Fibre-Reinforced Cement-Based Composites (SHCC), 59–71. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-94-007-0338-4_4.

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Wittmann, Folker H. "Durability under Combined Loads". W Durability of Strain-Hardening Fibre-Reinforced Cement-Based Composites (SHCC), 73–79. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-94-007-0338-4_5.

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Srikumar, Rohini, Bibhuti Bhusan Das i Sharan Kumar Goudar. "Durability Studies of Polypropylene Fibre Reinforced Concrete". W Lecture Notes in Civil Engineering, 727–36. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-3317-0_65.

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Yadav, Shonu, Bibhuti Bhusan Das i Sharan Kumar Goudar. "Durability Studies of Steel Fibre Reinforced Concrete". W Lecture Notes in Civil Engineering, 737–45. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-3317-0_66.

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Dvorkin, Leonid, Vadim Zhitkovsky, Oleh Bordiuzhenko i Yuri Ribakov. "Properties of Fibre Concrete Determining Its Durability". W High Performance Concrete Optimal Composition Design, 147–59. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003357865-11.

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Dhundasi, Abbas Ali, R. B. Khadiranaikar i Kashinath Motagi. "Durability Properties of Fibre-Reinforced Reactive Powder Concrete". W Recent Trends in Construction Technology and Management, 15–28. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2145-2_2.

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Streszczenia konferencji na temat "Fibre durability"

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"Durability of Steel Fibre Reinforced Concrete". W SP-212: Sixth CANMET/ACI: Durability of Concrete. American Concrete Institute, 2003. http://dx.doi.org/10.14359/12715.

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Herszberg, Israel, Michael K. Bannister, Henry C. H. Li, Ben Qi i Jane Marsden. "Durability under fatigue loading of optical fibres applied to fibre reinforced plastic composites". W Third European Workshop on Optical Fibre Sensors. SPIE, 2007. http://dx.doi.org/10.1117/12.738395.

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Davies, Peter, Nicolas Lacotte, Mael Arhant, Damien Durville, Abderrahim Belkhabbaz, Michel François, Fabien Khouri i in. "Improved Bend Over Sheave Durability of HMPE Ropes for Deep Sea Handling". W ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77530.

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The use of synthetic fiber ropes for subsea installation is extending, as the offshore industry explores deeper waters, but there are few data available to evaluate the lifetime of these materials. In a previous OMAE presentation the authors described results from the first phase (2010–2013) of a JIP aiming to understand the mechanisms controlling the long term behavior of HMPE fibre ropes [1]. This presentation will describe the results from the second phase of this study (2014–2018) in which predictive models have been developed and applied to a range of improved braided rope materials. Two modeling approaches will be discussed, an empirical method based on residual strength after cycling, and a numerical approach using finite element software specifically adapted to fibre materials [2]. An extensive test program, which has generated a database of CBOS (cyclic bend over sheave) results for various grades of HMPE and different constructions, will be described. Comparisons have been made with steel wire handling lines in order to quantify the benefits of fibre ropes for these deepwater applications.

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Foon, Leong Yee, Rokiah Binti Othman, Ramadhansyah Putra Jaya, Mohd Arif Sulaiman i Youventharan Duraisamy. "Durability of Basalt Rebars under Alkaline Environment". W World Sustainable Construction Conference Series 2022. Switzerland: Trans Tech Publications Ltd, 2023. http://dx.doi.org/10.4028/p-hr94qc.

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Basalt Fibre Reinforced Polymer (BRRP) is a new composite material made from basalt fibre, and resin matrix. It has been introduced to replace steel rebars as the main component of reinforced concrete structures because of their corrosion resistance under aggressive environments. This study investigates the mechanical properties of BFRP and the degradation state exposed to the alkaline environment and compares the corrosion rate with steel rebars. The flexural strength properties are tested as the parameter of mechanical properties. The results show that the flexural strength of BFRP is affected by immersion time (100h, 500h, 1000h) significantly. SEM results show mechanism of corrosion state that cracked resin matrix occurred and EDS results indicate the percentage components especially silicon elements that detected increased after corroded. This research identifies a current knowledge gap and can be serve as a reference point for further studies on the properties of BFRP bars to replace steel bars for safe and economic reinforced concrete structures in alkaline environments.

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"Mechanical Characteristics of High Performance Fibre Reinforced Concretes at Elevated Temperatures". W SP-212: Sixth CANMET/ACI: Durability of Concrete. American Concrete Institute, 2003. http://dx.doi.org/10.14359/12733.

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Nouri, Mustapha, i Mahfoud Tahlaiti. "A Dual-Scale Numerical Model for the Diffusive Behaviour Prediction of Biocomposites Based on Randomly Oriented Fibres". W 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.584.

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This work aims to present a multi-scale numerical approach based on a 2D finite element model to simulate the diffusive behaviour of biocomposites based on randomly dispersed Diss fibres during ageing in water. So, first of all, the diffusive behaviour of each phase (fibres/matrix) as well as of the biocomposite was determined experimentally. Secondly, the microstructure of the biocomposite was observed by optical microscope and scanning electron microscope (SEM), and then regenerated in a Digimat finite element calculation software thanks to its own fibre generator: "Random fibre placement". Finally, the diffusion problem based on Fick's law was solved on the Abaqus finite element calculation software. The results showed an excellent agreement between the experiment and the numerical model. The numerical model has enabled a better understanding of the diffusive behaviour of water within the biocomposite, in particular the effect of the fibre/matrix interface. In terms of durability, the layered structure of this biocomposite has proven to be effective in protecting the plant fibres from hydrothermal transfer, which preserves the durability of the material.

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"Fatigue Performance of Fibre-Reinforced CementComposite Concrete Beams". W "SP-126: Durability of Concrete: Second International Conference, Montreal, Canada 1991". American Concrete Institute, 1991. http://dx.doi.org/10.14359/2915.

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Nemegeer, D. "Brite Euram program on steel fibre concrete subtask: durability : corrosion resistance of cracked fibre reinforced concrete." W International RILEM Workshop on Test and Design Methods for Steelfibre Reinforced Concrete. RILEM Publications SARL, 2003. http://dx.doi.org/10.1617/2351580168.004.

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Rizk, A., i C. Davis. "Reliability and durability studies for fabricating, packaging and bonding Fibre Bragg gratings". W 35th Australian Conference on Optical Fibre Technology (ACOFT 2010). IEEE, 2010. http://dx.doi.org/10.1109/acoft.2010.5929941.

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Perumal, P., T. Paul, T. Luukkonen, J. Röning, P. Kinnunen i M. Illikainen. "Performance of Fibre-Reinforced Slag-Based Alkali Activated Mortar in Acidic Environment". W XV International Conference on Durability of Building Materials and Components. CIMNE, 2020. http://dx.doi.org/10.23967/dbmc.2020.109.

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Raporty organizacyjne na temat "Fibre durability"

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Tseng, Tzu-Chun, i Amit H. Varma. Synthesis Study: Repair and Durability of Fire-Damaged Prestressed Concrete Bridge Girders. Purdue University, 2022. http://dx.doi.org/10.5703/1288284317378.

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Recent research results from INDOT research project SPR-4221 indicate that the damage to prestressed concrete bridge girders from an intense hydrocarbon fire is limited to concrete material degradation up to a depth of 1 inch from the surface. Additionally, concrete cracking and spalling occur in the fire-damaged region, but the structural strength (flexure and shear) of fire-exposed prestressed concrete bridge girders is not compromised. The findings open the possibility for repairing damaged bridge girders and answers questions regarding the durability of damaged-unrepaired and damaged-repaired girders.

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Corum, J. M. Durability-Based Design Properties of Reference Crossply Carbon-Fiber Composite. Office of Scientific and Technical Information (OSTI), kwiecień 2001. http://dx.doi.org/10.2172/779794.

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Battiste, R. L., J. M. Corum, W. Ren i M. B. Ruggles. Durability-Based Design Criteria for a Chopped-Glass-Fiber Automotive Structural Composite. Office of Scientific and Technical Information (OSTI), listopad 1999. http://dx.doi.org/10.2172/14879.

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Corum, J. M. Durability-Based Design Criteria for a Quasi-Isotropic Carbon-Fiber Automotive Composite. Office of Scientific and Technical Information (OSTI), kwiecień 2002. http://dx.doi.org/10.2172/814041.

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Naus, Dan J., James Corum, Lynn B. Klett, Mike Davenport, Rick Battiste i Jr ,. William A. Simpson. Durability-Based Design Criteria for a Quasi-Isotropic Carbon-Fiber-Reinforced Thermoplastic Automotive Composite. Office of Scientific and Technical Information (OSTI), kwiecień 2006. http://dx.doi.org/10.2172/930728.

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Ren, W. Time-Dependent Deformation Modelling for a Chopped-Glass Fiber Composite for Automotive Durability Design Criteria. Office of Scientific and Technical Information (OSTI), sierpień 2001. http://dx.doi.org/10.2172/788361.

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Carringer, N. M., i S. Groves. Strength and Durability of Continuous Fiber Polymer Composites Final Report CRADA No. TC-0170-91. Office of Scientific and Technical Information (OSTI), luty 2018. http://dx.doi.org/10.2172/1424658.

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Battiste, R. L., J. M. Corum, W. Ren i M. B. Ruggles. Recommended Minimum Test Requirements and Test Methods for Assessing Durability of Random-Glass-Fiber Composites. Office of Scientific and Technical Information (OSTI), czerwiec 1999. http://dx.doi.org/10.2172/9282.

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Lee, Andre. Durability Characterization of POSS-Based Polyimides and Carbon-Fiber Composites for Air Force-Related Applications. Fort Belvoir, VA: Defense Technical Information Center, grudzień 2007. http://dx.doi.org/10.21236/ada481814.

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Weiss, Charles, William McGinley, Bradford Songer, Madeline Kuchinski i Frank Kuchinski. Performance of active porcelain enamel coated fibers for fiber-reinforced concrete : the performance of active porcelain enamel coatings for fiber-reinforced concrete and fiber tests at the University of Louisville. Engineer Research and Development Center (U.S.), maj 2021. http://dx.doi.org/10.21079/11681/40683.

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A patented active porcelain enamel coating improves both the bond between the concrete and steel reinforcement as well as its corrosion resistance. A Small Business Innovation Research (SBIR) program to develop a commercial method for production of porcelain-coated fibers was developed in 2015. Market potential of this technology with its steel/concrete bond improvements and corrosion protection suggests that it can compete with other fiber reinforcing systems, with improvements in performance, durability, and cost, especially as compared to smooth fibers incorporated into concrete slabs and beams. Preliminary testing in a Phase 1 SBIR investigation indicated that active ceramic coatings on small diameter wire significantly improved the bond between the wires and the concrete to the point that the wires achieved yield before pullout without affecting the strength of the wire. As part of an SBIR Phase 2 effort, the University of Louisville under contract for Ceramics, Composites and Coatings Inc., proposed an investigation to evaluate active enamel-coated steel fibers in typical concrete applications and in masonry grouts in both tension and compression. Evaluation of the effect of the incorporation of coated fibers into Ultra-High Performance Concrete (UHPC) was examined using flexural and compressive strength testing as well as through nanoindentation.

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