Microstructural alteration of alkali activated slag mortars depend on exposed high temperature level

Türker, Hakan; Balçıkanlı, Müzeyyen; Durmuş, İbrahim Halil; Özbay, Erdoğan; Erdemir, Mustafa

doi:10.1016/j.conbuildmat.2015.12.070

Cited by 135 publications

(41 citation statements)

References 42 publications

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“…This result is similar to study of Türker, H.T. et al [ 26 ] about the ambient cured mortar sample. According to Türker, H.T.…”

Section: Resultssupporting

confidence: 92%

“…Moreover, the fire performance of AAS mortar cured in two different regimes (ambient and heat curing condition) with exposure temperatures from 200 to 800 °C was investigated by Türker, H.T. et al [ 26 ]. The results illustrated that the strength of ambient curing specimens at 200 °C increased approximately 20% when compared to reference specimens, while a strength decrease was observed in heat curing mortar.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Activator Na2O Concentration on Residual Strengths of Alkali-Activated Slag Mortar upon Exposure to Elevated Temperatures

Tran

Kwon

2018

Materials

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The mechanical strength variation of ambient cured Alkali-activated mortar (AAS) upon exposure to elevated temperatures from 200 to 1200 °C was studied in this article. Slag was activated by the combination of sodium silicate liquid (Na2SiO3) and sodium hydroxide (NaOH) with different Na2O concentrations of 4%, 6%, 8%, and 10% by slag weight. Mechanical properties comprising compressive strength, flexural strength, and tensile strength before and after exposure were measured. Thermogravimetric analysis (Thermogravimetric analysis (TGA) and Derivative thermogravimetric (DTG)), X-ray diffraction (XRD), scanning electron microscope (SEM), and energy-dispersive X-ray spectroscopy (EDS) were also used for strength alteration explanation. The results indicated that Na2O concentration influence on strength variation of AAS mortar was observed clearly at temperature range from ambient temperature to 200 °C. The melting alteration of AAS mortar after exposed to 1200 °C was highly dependent on concentrations of Na2O.

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“…This result is similar to study of Türker, H.T. et al [ 26 ] about the ambient cured mortar sample. According to Türker, H.T.…”

Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Influence of Activator Na2O Concentration on Residual Strengths of Alkali-Activated Slag Mortar upon Exposure to Elevated Temperatures

Tran

Kwon

2018

Materials

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“…Geopolymer composites have been produced with different types of particles with the aim of modifying their microstructural, mechanical, and thermal properties. Nanopowders of carbon, α‐alumina and mullite nanosilica, cordierite, zircon, quartz and illite clay mineral, refractory particles ground electrical porcelain, hollow ceramic microspheres, chamotte, river sand and vermiculite have been incorporated into geopolymers. The incorporation of α‐Al 2 O 3 in high volumes increases the compressive strength of the geopolymer and the incorporation of 10.5 wt% chamotte particles into geopolymer pastes based on metakaolin decreases the crystallization temperature of the leucite and increases the flexural strength of the composite …”

Section: Introductionmentioning

confidence: 99%

Mechanical and microstructural analysis of geopolymer composites based on metakaolin and recycled silica

Villaquirán-Caicedo

Gutiérrez

2018

J Am Ceram Soc

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This paper evaluated mechanical and thermal stability of alkali‐activated materials obtained from metakaolin and alternative silica sources, such as rice husk ash (RHA) and silica fume (SF), and were reinforced with recycled ceramic particles (RP) obtained by grinding bricks. Specimens were produced, and after 7 days of curing, they were exposed to temperatures between 300 and 1200°C to determine the influence that different percentages of RP had on the mechanical behavior and microstructure of the produced composites. The results showed a reduction in the linear contraction by 10.22% with 20 wt% RP and that the reinforcing materials improved the mechanical performance of the geopolymers after exposure to high temperatures; the compressive strengths reached 137.7 (±11.4) MPa after being exposed to 1200°C for the matrix based on RHA and 180.6 (±19.15) MPa after being reinforced with 20 wt% RP. The improvement was mainly due to densification and the formation of crystalline products such as leucite, kalsilite, and mullite.

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“…Quartz (SiO 2 ) and calcium oxide (CaO) are the main phases [35]. The amorphous hump displayed in the XRD analysis of the GGBFS indicates that a large amount of glass is present [36].…”

Section: Mineralogical Characterization Of Solid Materialsmentioning

confidence: 99%

Reuse of waste bricks: a new generation of geopolymer bricks

et al. 2019

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In this study, the potential for reuse of waste brick (WB) by alkaline activation in a new geopolymer brick was examined. The effect of the incorporation of ground granulate blast furnace slag (GGBFS), the molarity of sodium hydroxide (NaOH) and the silicate to sodium hydroxide ratio (Na 2 SiO 3 /NaOH) on the mechanical properties of the final product was investigated. The manufacturing of geopolymer bricks was carried out by mixing WBs, GGBFS, sand with a solution of hydroxide and sodium silicate. The samples were prepared according to different formulations. The optimal compressive strength obtained is 89.91 MPa, for a GGBFS/WB ratio of 80/20, an 8 M molarity of NaOH and a silicate/hydroxide ratio of 2/1. This study shows an effective feasibility for the recovery and recycling of industrial waste into a valuable product for the construction sector. This recycling method can bring environmental and economic benefits by using it as an alternative material to fired brick in construction. Given the results obtained, it will be interesting to study the environmental and economic impact as well as the durability properties of these geopolymer bricks. Graphical abstractKeywords Geopolymer · Recovery of waste bricks · GGBFS · Reuse · Alkaline activation · Compressive strength

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Microstructural alteration of alkali activated slag mortars depend on exposed high temperature level

Cited by 135 publications

References 42 publications

Influence of Activator Na2O Concentration on Residual Strengths of Alkali-Activated Slag Mortar upon Exposure to Elevated Temperatures

Influence of Activator Na2O Concentration on Residual Strengths of Alkali-Activated Slag Mortar upon Exposure to Elevated Temperatures

Mechanical and microstructural analysis of geopolymer composites based on metakaolin and recycled silica

Reuse of waste bricks: a new generation of geopolymer bricks

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