The effect of organic and inorganic fibres on the mechanical and thermal properties of aluminate activated geopolymers

Masi, Giulia; Rickard, William D.A.; Bignozzi, Maria Chiara

doi:10.1016/j.compositesb.2015.02.023

Cited by 147 publications

(73 citation statements)

References 40 publications

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“…This means that a possible increase in porosity du to fibre addition is overcome at later curing ages when the binder has hardened enough so the crack arrest effect of fibres become evident. This compressive strength reduction was also noticed by other authors working with fibre reinforced geopolymers [16,22]. Other authors [23] reported a decrease in the compressive strength in the mix compositions containing a fibre content above 0.5%.…”

Section: Compressive Strengthsupporting

confidence: 83%

Experimental and numerical investigations on the flexural performance of geopolymers reinforced with short hybrid polymeric fibres

Kheradmand

Mastali

Abdollahnejad

et al. 2017

Composites Part B: Engineering

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a b s t r a c tGeopolymers have much higher drying shrinkage than Portland cement based composites Shrinkage performance is an important property for reinforced concrete composites just because a high shrinkage performance is associated to cracking tendency that leads to future durability problems. This paper provides results experimental and numerical investigations of fly ash based geopolymeric mortars reinforced with short hybrid polymeric fibres (SHPF). The results show that SHPF improved the flexural performance, while reducing the compressive strength and flexural stiffness of geopolymeric mortars. The addition of 0.8% SHPF increased about two times the fracture energy and about 50% the tensile strength. The adopted constitutive model well-captured the flexural performance of the tested beams.

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Section: Compressive Strengthsupporting

confidence: 83%

Experimental and numerical investigations on the flexural performance of geopolymers reinforced with short hybrid polymeric fibres

Kheradmand

Mastali

Abdollahnejad

et al. 2017

Composites Part B: Engineering

View full text Add to dashboard Cite

show abstract

“…It has been reported that the tensile strength of carbon fibres decreased with increasing temperature and that after exposure to 500 °C, carbon fibres only retained 25% of their ambient temperature strength (58). Thus, the addition of CF had almost no influence on the flexural strength of geopolymers after exposure to 500 °C (54), similar similar behavior was found by Masi et al (59) using PVA fibres and by He et al (58). When compared with unreinforced matrix, G-CF and G-AF samples showed increased fracture work associated with higher loading capacities and steeper slopes.…”

Section: Physical and Mechanical Propertiessupporting

confidence: 77%

“…When compared with unreinforced matrix, G-CF and G-AF samples showed increased fracture work associated with higher loading capacities and steeper slopes. In the case of materials reinforced with ceramic fibers (G-AF), although the fibers have melting point of 1760 °C, these fibers being in contact with the alkaline medium react and loss of integrity occurs, creating a porous matrix as can be seen in the SEM images; Masi et al (59) found similar behavior for basalt fiber reinforced materials. Fibre-and fibreparticle-reinforced composites exhibited somewhat "plastic" type fractures.…”

Section: Physical and Mechanical Propertiesmentioning

confidence: 98%

A Novel MK-based Geopolymer Composite Activated with Rice Husk Ash and KOH: Performance at High Temperature

2017

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Geopolymers were produced using an environmentally friendly alkali activator (based on Rice Husk Ash and potassium hydroxide). Aluminosilicates particles, carbon and ceramic fibres were used as reinforcement materials. The effects of reinforcement materials on the flexural strength, linear-shrinkage, thermophysical properties and microstructure of the geopolymers at room and high temperature (1200 °C) were studied. The results indicated that the toughness of the composites is increased 110.4% for geopolymer reinforced by ceramic fibres (G-AF) at room temperature. The presence of particles improved the flexural behaviour 265% for geopolymer reinforced by carbon fibres and particles after exposure to 1200 ºC. Linear-shrinkage for geopolymer reinforced by ceramic fibres and particles and the geopolymer G-AF compared with reference sample (without fibres and particles) is improved by 27.88% and 7.88% respectively at 900 °C. The geopolymer materials developed in this work are porous materials with low thermal conductivity and good mechanical properties with potential thermal insulation applications for building applications.

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“…Various organic and inorganic fibres are also added to reinforce geopolymers to improve its fire resistance. Masi et al (2015) reported a study where poly vinyl alcohol (PVA) and basalt short fibres are added to fly ash based geopolymer activated by sodium hydroxide and sodium aluminate solutions. Results show better mechanical properties of basalt fibre reinforced geopolymer at elevated temperatures than its PVA fibre reinforced counterpart.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of Carbon and Basalt Fibres Reinforced Fly Ash Geopolymer at Elevated Temperatures

Shaikh

Haque

2018

Int J Concr Struct Mater

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This paper presents the behaviour of potassium activators synthesized fly ash geopolymer containing carbon and basalt fibre at ambient and elevated temperature. Six series of fly ash based geopolymer were cast where carbon and basalt fibre were added as 0.5, 1 and 1.5% by weight of fly ash. One extra control series without any fibre was also cast. Each series of samples were tested at ambient temperature and also heated at 200, 400, 600 and 800°C and thus a total of 35 series of samples were tested in this study. The result shows that the geopolymer containing 1 wt% basalt and 1 wt% carbon fibre exhibited better compressive strength, lower volumetric shrinkage and mass loss than other fibre contents. Among two fibres composites, the carbon fibre geopolymer exhibited better performance than its basalt fibre counterpart regardless of temperature. The microstructure of carbon fibre reinforced geopolymer composite is more compact containing fewer pores/voids than its basalt based counterpart at elevated temperatures. The results also support the fact that carbon fibre is better than basalt fibre at elevated temperature and showed better bonding with geopolymer at elevated temperature.

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The effect of organic and inorganic fibres on the mechanical and thermal properties of aluminate activated geopolymers

Cited by 147 publications

References 40 publications

Experimental and numerical investigations on the flexural performance of geopolymers reinforced with short hybrid polymeric fibres

Experimental and numerical investigations on the flexural performance of geopolymers reinforced with short hybrid polymeric fibres

A Novel MK-based Geopolymer Composite Activated with Rice Husk Ash and KOH: Performance at High Temperature

Behaviour of Carbon and Basalt Fibres Reinforced Fly Ash Geopolymer at Elevated Temperatures

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