Interfacial bond strength of glass fibre reinforced cement composites

Vekey, R. C. de; Majumdar, A.J.

doi:10.1007/bf00554638

Cited by 24 publications

(7 citation statements)

References 3 publications

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“…The S/ Ca against Al/Ca plot further confirms the fine intermixture of CH and C-S-H. This is contrary to the previously reported studies on OPC/GRC [6,18,19]; most of which stated that the composition of the precipitated …”

Section: Aged Petrographic Samplescontrasting

confidence: 64%

“…OPC matrix GRC demonstrates significant reductions in tensile strength and ductility as time develops, particularly in humid environments [1,2]. The degradation is normally associated with fibre corrosion by the high alkalinity within the matrix [3][4][5] and/or loss of fibre flexibility by the precipitation of CH within and around glass fibre strands [2,3,6]. Therefore efforts have been directed towards the study of modified matrix formulations with markedly reduced alkalinity and/or propensity to precipitate calcium hydroxide.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure of interface between fibre and matrix in 10-year aged GRC modified by calcium sulfoaluminate cement

Song

Purnell

Richardson

2015

Cement and Concrete Research

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a b s t r a c tTime-dependent property changes in glass fibre reinforced cement (GRC) mainly result from a combination of the alkalinity of the matrix and densification of the matrix (e.g. due to calcium hydroxide precipitation) within and around the glass fibre strands. The microstructure of the interface between matrix and fibres in GRC has a significant impact on its durability. This paper describes a study of two GRC formulations (with OPC, and OPC plus calcium sulfoaluminate based matrices) aged for 10 years at 25°C. Thin-section petrography (TSP) and SEM are used to compare the microstructure of both polished surfaces and fractured surfaces. The aged OPC/ GRC demonstrates significantly brittle behaviour with substantial densification of C-S-H/CH intermixture occurring around glass fibres. In contrary, the aged composite made with the OPC plus calcium sulfoaluminate shows greatly retained toughness, accompanied by considerably flexible interfacial and interfilamentary areas around the glass fibres.

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Section: Aged Petrographic Samplescontrasting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Microstructure of interface between fibre and matrix in 10-year aged GRC modified by calcium sulfoaluminate cement

Song

Purnell

Richardson

2015

Cement and Concrete Research

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“…However, if the adhesion is not so durable and if any voids appear between the fiber and the matrix, these voids may act as initial fracture sites in the composite and facilitate the breakdown of the material [19]. Given this, durable adhesion between the fiber and the matrix is significant for the mechanical performance and the longevity of restoration in dental applications [20].…”

Section: Adhesion Between Fiber and Matrixmentioning

confidence: 99%

E-Glass Fiber Reinforced Composites in Dental Applications

Zhang

Matinlinna

2011

Silicon

155

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Fiber reinforced composites (FRCs) are more and more widely applied in dentistry to substitute for metallic restorations: periodontal splints, fixed partial dentures, endodontic posts, orthodontic appliances, and some other indirect restorations. In general in FRCs, the fiber reinforcement provides the composite structure with better biomechanical performance due to their superior properties in tension and flexure. Nowadays, the E-glass fiber is most frequently used because of its chemical resistance and relatively low cost. Growing interest is being paid to enhance its clinical performance. Moreover, various techniques are utilized to reinforce the adhesion between the fiber and the matrix. Oral conditions set special requirements and challenges for the clinical applications of FRCs. The biomechanical properties of dental materials are of high importance in dentistry, and given this, there is on-going scientific interest to develop E-glass fiber reinforced composite systems. FRCs are generally biocompatible and their toxicity is not a concern.

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“…fracture, which indicates that the fiber and the matrix cannot be easily separated. The detailed mechanism of the interfacial bonding in glass-cement composites has been intensively studied, [1][2][3][4][5][6][7] and it is generally agreed that the corrosive alkali environment during the cement curing is the main reason that causes strong interfacial bonding. The alkali corrosion causes not only strong interfacial bonding but also degradation of the filament.…”

Section: (4) Sem Observationsmentioning

confidence: 99%

“…The chemical factor is that the glass fibers are, more or less, subjected to alkali attack in moist cement environments and lose some of their tensile strength. 1 The physical cause of GFRC aging may result from the tendency of the cement hydration products, especially calcium hydroxides, to fill spaces between the cement and the fibers and form strong bonding between them, 6,7 which results in embrittlement.…”

Section: Introductionmentioning

confidence: 99%

Carbon‐Coated‐Glass‐Fiber‐Reinforced Cement Composites: I, Fiber Pushout and Interfacial Properties

Huang

Zhu

Cong

et al. 1997

Journal of the American Ceramic Society

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Interfacial mechanical properties of carbon-coated-S-glassfiber-reinforced cement were characterized by a fiber pushout technique. The pushout experiments were conducted on model composites, where the S-glass monofilaments with and without carbon coating were unidirectionally embedded in ordinary portland cement. Interfacial properties, including bonding strength, frictional stress, residual stress, and fracture energy, were extracted from the previously developed progressive debonding model. The composite with a carbon interface exhibited a weaker interfacial bonding strength and frictional stress than did the composite without a carbon interface. The interfacial fracture energy of the composite with a carbon interface was 7.9 J/m 2 , as compared to 47.6 J/m 2 for the composite without a carbon interface. The composite with the carbon interface exhibited a smaller residual clamping stress (18 MPa), in comparison to that for the composite without a carbon interface (69 MPa). Scanning electron microscopy observations indicated that the filament without a carbon coating was significantly attacked by the alkaline environment and was strongly bonded onto the matrix, whereas the filament with a carbon coating remained intact under the same curing conditions. These studies suggest that carbon coating provides the glass fiber with significantly improved corrosion resistance to alkali in the cement environment.

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Interfacial bond strength of glass fibre reinforced cement composites

Cited by 24 publications

References 3 publications

Microstructure of interface between fibre and matrix in 10-year aged GRC modified by calcium sulfoaluminate cement

Microstructure of interface between fibre and matrix in 10-year aged GRC modified by calcium sulfoaluminate cement

E-Glass Fiber Reinforced Composites in Dental Applications

Carbon‐Coated‐Glass‐Fiber‐Reinforced Cement Composites: I, Fiber Pushout and Interfacial Properties

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