Accelerated aging tests for evaluations of durability performance of FRP reinforcing bars for concrete structures

Chen, Yi; Davalos, Julio F.; Ray, Indrajit; Kim, Hyeong-Yeol

doi:10.1016/j.compstruct.2005.08.015

Cited by 436 publications

(220 citation statements)

References 9 publications

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“…The reduction in TS, flexural strength, YM, and flexural modulus for neat PLA with increased duration of accelerated ageing is considered to be due to plasticisation, swelling effect [26] and photochemical degradation [27]. Although weight loss of neat PLA by photodegradation and leaching out would be expected to decrease the molecular weight of neat PLA leading to increase of crystallinity and as a consequence a reduction in YM, the plasticization effect in the neat PLA chains by moisture absorption could really increase the toughness which could outweigh the effect of increased crystallinity of neat PLA and hence a resultant decrease of YM.…”

Section: Effect Of Accelerated Ageing On Mechanical Propertiesmentioning

confidence: 99%

Influence of accelerated ageing on the physico-mechanical properties of alkali-treated industrial hemp fibre reinforced poly(lactic acid) (PLA) composites

Islam

Pickering

Foreman³

2010

Polymer Degradation and Stability

137

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Abstract. In this study, 30 wt% aligned untreated long hemp fibre/PLA (AUL) and aligned alkali treated long hemp fibre/PLA (AAL) composites were produced by film stacking and subjected to accelerated ageing environment. Accelerated ageing was carried out with an accelerated ageing chamber using UV-irradiation and water spray at 50 °C for four different time intervals (250, 500, 750 and 1000 hrs). After accelerated ageing, tensile strength (TS), flexural strength, Young's modulus (YM), flexural modulus and mode I fracture toughness (K Ic ) were found to decrease and impact strength (IS) was found to increase for both AUL and AAL composites. AUL composites had greatest overall reduction in mechanical properties than that for AAL composites upon exposure to accelerated ageing environment. FTIR analysis and crystallinity contents of the accelerated aged composites support the results of the deterioration of mechanical properties upon exposure to accelerated ageing environment.

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Section: Effect Of Accelerated Ageing On Mechanical Propertiesmentioning

confidence: 99%

Influence of accelerated ageing on the physico-mechanical properties of alkali-treated industrial hemp fibre reinforced poly(lactic acid) (PLA) composites

Islam

Pickering

Foreman³

2010

Polymer Degradation and Stability

137

View full text Add to dashboard Cite

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“…When viscosity increases generally there will be a tendency of formation of voids and also from the same image we can also observe the random orientation of the fiber [23,24]. After comparing the two images we come to conclusion that adding more clay leads to agglomeration as a result which causes microvoids which at as a stress concentration factors which facilitates shear yielding in the system and therefore ultimately strength would be going down [16,17]. Fig.3 shows the TGA analysis of the two different clay loaded samples such as 3wt.% and 5wt.%, and also it was noticed that for 5wt.% clay loading thermal stability was increase from 352°C-356°C.…”

Section: Resultsmentioning

confidence: 99%

Development of <i>Sansevieria trifasciata</i> - Carbon Fiber Reinforced Polymer Hybrid Nanocomposites

Raghava

Kumar

Murthy³

et al. 2015

ILCPA

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This paper presents studies on experimental values of tensile strength properties of hybrid nanocomposites were studied and compared with theoretical values. It was observed that, experimental strengths were fallen shorter than the theoretical values. Nanocomposites were fabricated by filling MMT nanoclay by weight ratio and reinforced with short sansevieria trifasciata (STF) and short carbon fibre (CF) by randomly orientation. Organically modified montmorillonite clay filled with different proportions viz.0, 1, 3 and 5 wt.% dispersed into the vinyester matrix modified system by hand lay-up technique. Natural fiber was treated by NaOH solution was brought significant performance. Tensile strength was found maximum when clay content was Clay 3wt%. In the fracture surfaces of samples were analysed by SEM analysis, in which it was observed that, increased clay viscosity played vital role in bringing the performance as the viscosity of the mixture made difficult to flow the resin. Thermal stability was significantly improved for the 5wt% sample due to the high content of silicate particles and carbon fibre content.

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“…Then mould surfaces were sprayed with polyvinylalcohol in order to retain the shape of the casting after it is being cured while it is being taken out from the oven. A layer of modified epoxy was poured into the mould upon which CF was stacked randomly by parts [20]. Then the SD was mixed well with epoxy using mechanical stirrer until it mixture for no air bubbles.…”

Section: Specimen Preparationmentioning

confidence: 99%

Utilisation of CF/Sawdust Reinforced Epoxy Hybrid Composites on Mechanical Properties

Kumar

Chowdary

Balaji

et al. 2015

ILCPA

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This paper presents the performance of short carbon fibre (CF) reinforced and filled with sawdust (SD) hybrid epoxy composites were evaluated. The results showed that hybridisation of carbon fibre and sawdust was in similarity to EP/CF hybrid composites. Effect of fibre orientation in matrix and the analysis and fracture surface was undertaken. The mechanical properties of injection moulded, chopped carbon fibre/sawdust/epoxy hybrid composites were investigated by considering the effect of hybridisation by these two fillers. It was observed that the tensile, flexural, and impact properties of the filled epoxy were higher than those of unfilled epoxy. The effect of filler on epoxy matrix subjected to the tensile strength and modulus was studied and compared with the rule of hybrid mixtures. The effect of filler on epoxy matrix subjected to the tensile strength and modulus was studied and compared with the rule of mixture. The actual results are marginally low as compared with the values obtained by the rule of hybrid mixtures (RoHM).

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Accelerated aging tests for evaluations of durability performance of FRP reinforcing bars for concrete structures

Cited by 436 publications

References 9 publications

Influence of accelerated ageing on the physico-mechanical properties of alkali-treated industrial hemp fibre reinforced poly(lactic acid) (PLA) composites

Influence of accelerated ageing on the physico-mechanical properties of alkali-treated industrial hemp fibre reinforced poly(lactic acid) (PLA) composites

Development of <i>Sansevieria trifasciata</i> - Carbon Fiber Reinforced Polymer Hybrid Nanocomposites

Utilisation of CF/Sawdust Reinforced Epoxy Hybrid Composites on Mechanical Properties

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