Reusing fly ash in glass fibre reinforced cement: A new generation of high-quality GRC composites

Payá, J.; Bonilla, M.; Borrachero, M.V.; Monzó, J.; Peris-Mora, E.; Lalinde, Luis Felipe

doi:10.1016/j.wasman.2007.03.014

Cited by 17 publications

(15 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This ageing can nullify the positive effects of glass fibers undergoing from a ductile to a brittle material. Different strategies for improving the durability of GRC have been attempted by modifying the fibers and/or by altering the alkalinity of the matrix [7][8][9]. All these improvements have been evaluated by mechanical tests after accelerated ageing.…”

Section: Introductionmentioning

confidence: 99%

Nondestructive Monitoring of Ageing of Alkali Resistant Glass Fiber Reinforced Cement (GRC)

et al. 2013

Self Cite

View full text Add to dashboard Cite

Glass fiber reinforced cement (GRC) is a composite material made of portland cement mortar and alkali resistant (AR) fibers. AR fibers are added to portland cement to give the material additional flexural strength and toughness.However ageing deteriorates the fibers and as a result the improvement in the mechanical properties resulted from the fiber addition disappears as the structure becomes old. The aim of this paper is monitoring GRC ageing by nondestructive evaluation (NDE) techniques. Two different NDE techniques -1) nonlinear impact resonant acoustic spectroscopy analysis and 2) propagating ultrasonic guided waves -are used for this purpose. Both techniques revealed a reduction of the nonlinear behavior in the GRC material with ageing. Specimens are then loaded to failure to obtain their strength and stiffness. Compared to the un-aged specimens the aged specimens are found to exhibit more linear behavior, have more stiffness but less toughness. Finally, undisturbed fragments on the fracture surface form mechanical tests are inspected under the electron microscope, to understand the fundamental mechanisms that cause the change in the GRC behavior with ageing.Keywords: Glass Fiber Reinforced Cement, Material Ageing, Ultrasonic Guided Waves, Nonlinear Impact Resonant Acoustic Spectroscopy, Nondestructive Evaluation. IntroductionAlkali resistant glass fiber reinforced portland cement is a cement-based composite material that has higher flexural strength and toughness than plain cement [1]. However, GRC undergoes a rapid ageing process especially in humid and alkaline environment (pH>12). This ageing can nullify the positive effects of glass fibers undergoing from a ductile to a brittle material. Different strategies for improving the durability of GRC have been attempted by modifying the fibers and/or by altering the alkalinity of the matrix [7][8][9]. All these improvements have been evaluated by mechanical tests after accelerated ageing. Accelerated ageing tests have been broadly accepted for testing the durability of GRC. They can be classified as i) Deemed to satisfy tests, (EN 1170-8 [10]) where the GRC specimens are exposed to severe conditions, and ii) predictive accelerated ageing tests [11] that are commonly used to predict the service life of the material, in real weather conditions. For example, Purnell et al. [2] established that GRC soaked for 1 day in water at 55ºC, corresponds to 100 days of exposure to the real weather conditions in the United Kingdom. However, it should be noted that the correspondence between the accelerated ageing tests and the real aging conditions is still being investigated, especially when different matrix compositions are to be compared [11][12]. Typically the ageing process has been assessed by mechanical testing or by strand in cement (SIC) tests [13][14]. The aim of this work is to assess the ageing process in GRC by two nondestructive testing techniques -1) resonance frequency tests at different impact energy levels called Nonlinear Impact Resonance Acousti...

show abstract

Section: Introductionmentioning

confidence: 99%

Nondestructive Monitoring of Ageing of Alkali Resistant Glass Fiber Reinforced Cement (GRC)

et al. 2013

Self Cite

View full text Add to dashboard Cite

show abstract

“…Cem-FIL Star, a metakaolin-containing GRC, exhibits much improved tensile strength and ductility in accelerated ageing tests. Other recent studies have proven that silica fume and fly ash also have a beneficial effect on the behaviour of glass-fibre reinforced concrete (20,21).…”

Section: Introductionmentioning

confidence: 96%

“…El GRC fabricado con una adición de metacaolín se denomina Cem-FIL Star y muestra una mejora considerable de la resistencia a tracción y de la ductilidad en ensayos realizados sobre material envejecido mediante métodos acelerados. Estudios recientes afirman también que el humo de sílice y las cenizas volantes tienen una influencia positiva en el comportamiento de los morteros reforzados con fibras de vidrio (20,21).…”

Section: Introductionunclassified

El efecto del humo de sílice y el metacaolín en el proceso de envejecimiento de los morteros de cemento reforzados con fibras de vidrio (GRC)

Enfedaque¹,

Paradela²,

Sánchez‐Gálvez³

2010

Mater. construcc.

View full text Add to dashboard Cite

“…These modifications of the matrix have resulted in an improvement of the fibre-matrix interface, partially inhibiting fibre degradation due to the reduction of the pH level and the Ca(OH) 2 content [7][8][9][10]. Thus the mechanical properties of the GRC specimens are improved significantly.…”

mentioning

confidence: 99%

“…Thus the mechanical properties of the GRC specimens are improved significantly. Usually, the characterization of this kind of cement composite is carried out through conventional techniques such as x-ray diffraction, thermogravimetry, and mechanical tests [10,11].…”

mentioning

confidence: 99%

Ultrasonic characterization of GRC with high percentage of fly ash substitution

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

Reusing fly ash in glass fibre reinforced cement: A new generation of high-quality GRC composites

Cited by 17 publications

References 5 publications

Nondestructive Monitoring of Ageing of Alkali Resistant Glass Fiber Reinforced Cement (GRC)

Nondestructive Monitoring of Ageing of Alkali Resistant Glass Fiber Reinforced Cement (GRC)

El efecto del humo de sílice y el metacaolín en el proceso de envejecimiento de los morteros de cemento reforzados con fibras de vidrio (GRC)

Ultrasonic characterization of GRC with high percentage of fly ash substitution

Contact Info

Product

Resources

About