Thermal behaviour of inorganic geopolymers and composites derived from sodium polysialate

Barbosa, Valeria F.F.; MacKenzie, Kenneth J.D.

doi:10.1016/s0025-5408(02)01022-x

Cited by 470 publications

(285 citation statements)

References 7 publications

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“…In an effort to limit the environmental impact of concrete materials, there is increasing interest in the development an environmental-friendly material. As an outstanding candidate, geopolymer can provide comparable performance to traditional cementitious binders in a range of applications, but with the added advantage of significantly reduced greenhouse emissions [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/Cr_pReinforced Geopolymer Composites

Yuan

Jia

2017

MATEC Web Conf.

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Abstract. In this study, a series stainless steel mesh/Cr p reinforced geopolymer composites with different Si/Al molar ratio (N) were designed and prepared, where N = 1.75, 2 and 2.25, respectively. The effect of Si/Al molar ratio in the geopolymer matrix on mechanical properties and fracture behavior of the geopolymer composites were investigated. The microstructure of geopolymer became more compact when Si/Al increased from 1.75 to 2, which was beneficial to the improvement of geopolymer's mechanical properties. And continuing to rise to 2.25 for Si/Al, the completely curing of geopolymer composites required more time compared with lower Si/Al, which can be attributed to the different microstructure and chemical composition caused by the different Si/Al. The optimum Si/Al molar ratio was about 2 at which the composites samples present the best mechanical properties with the flexure strength of 115.3 MPa and elastic modulus of 11.0 GPa, respectively. The results of fracture behavior suggested that geopolymer composites with N is 2.25 displayed the behavior characteristics of metal materials, which can be attributed to a poor integrated condition in interface between reinforcements and geopolymer matrix.

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Section: Introductionmentioning

confidence: 99%

The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/Cr_pReinforced Geopolymer Composites

Yuan

Jia

2017

MATEC Web Conf.

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“…In particular, the broad bands at about 3435 cm −1 and 1630 cm −1 are due to O-H stretching and bending modes of absorbed molecular water while the band at 1040 cm −1 is due to Si-O stretching and that at about 460 cm −1 is due to Si-O bending vibration. Finally, the bands in the region 800-600 cm −1 are associated to Si-O-Al vibrations [39][40][41][42][43].…”

Section: Ft-ir Analysismentioning

confidence: 99%

Geopolymer Composites for Potential Applications in Cultural Heritage

Ricciotti

Molino

Roviello³

et al. 2017

Environments

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Abstract:A new class of geopolymer composites, as materials alternative to traditional binders, was synthesized and its potentialities as restoration material in Cultural Heritage has been explored. This material has been prepared through a co-reticulation reaction in mild conditions of a metakaolin-based geopolymer inorganic matrix and a commercial epoxy resin. The freshly prepared slurry displays a consistency, workability and thixotropic behavior that make it suitable to be spread on different substrates in restoration, repair and reinforcement actions, even on walls and ceilings. Applicability and compatibility tests on tuff and concrete substrates were carried out and the microstructure of the samples in correspondence of the transition zone was analyzed by means of scanning electron microscope (SEM) observations and energy dispersive spectroscopy (EDS) mapping. Our studies pointed out the formation of a continuous phase between the geopolymer composite and tuff and concrete substrates, highlighting a high compatibility of the geopolymer binder with different kinds of materials. These features indicate a large potential for applications of these materials in Cultural Heritage.

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“…Heat resistant properties of metakaoline based GPs were investigated and its thermal stability upto 1200-1400°C was reported. Heat resistant properties of alkali activated fly ash were investigated by several workers [10][11][12][13][14][15] and geopolymeric paste indicated high shrinkage as well as large changes in compressive strength at elevated temperature in the range 800-1200°C. To improve thermal resistance, alternate GSMs such as mine tailings, waste ceramics were tried and satisfactory thermo stable geopolymeric paste was obtained [16][17].…”

Section: Introductionmentioning

confidence: 99%

Fire Related Temperature Resistance of Fly Ash Based Geopolymer Mortar

et al. 2017

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Abstract. The study presented in this paper is on the effect of heat treatment on fly ash based geopolymer mortar synthesized from fly ash (Class F -Low lime) using alkaline binary activator solution containing sodium hydroxide (18 M) and sodium silicate solution (MR 2.0), cured at 80oC for 24 h. 7 days aged specimen heated at elevated temperature (200°C, 400°C, 600°C and 800°C) for the sustained period of 2hrs. The TGA/DTA analysis and thermal conductivity measurement as per ASTM C113 were carried out besides the compressive strengths. The thermal stability of the fly ash mortar at elevated temperature was found to be high as reflected in the observed value of f800°C/f30°C being more than 1 and this ratio was raised to about 1.3 with the addition of 2% Zirconium di oxide (ZrO 2 ). No visible cracks were found on the specimens with and without ZrO 2 when 800°C was sustained for 4 hrs in smaller specimens of size: 50 mm diameter x 100 mm height and in also bigger size specimens: 22 cm x 11 cm x 7 cm) specimens. TGA/DTA analysis of the geopolymer paste showed that the retention of mass was around 90%. The addition of ZrO2 improved thermal resistance. The micro structure of the matrix found to be intact even at elevated temperature that was evident from the FESEM studies.

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Thermal behaviour of inorganic geopolymers and composites derived from sodium polysialate

Cited by 470 publications

References 7 publications

The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/Cr_pReinforced Geopolymer Composites

The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/Cr_pReinforced Geopolymer Composites

Geopolymer Composites for Potential Applications in Cultural Heritage

Fire Related Temperature Resistance of Fly Ash Based Geopolymer Mortar

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Thermal behaviour of inorganic geopolymers and composites derived from sodium polysialate

Cited by 470 publications

References 7 publications

The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/CrpReinforced Geopolymer Composites

The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/CrpReinforced Geopolymer Composites

Geopolymer Composites for Potential Applications in Cultural Heritage

Fire Related Temperature Resistance of Fly Ash Based Geopolymer Mortar

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Product

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The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/Cr_pReinforced Geopolymer Composites

The Effect of Si/Al on Mechanical Properties and Fracture Behavior of Stainless Steel Mesh/Cr_pReinforced Geopolymer Composites