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

Villaquirán-Caicedo, Mónica A.; Gutiérrez, Ruby Mejía de

doi:10.1111/jace.16208

Cited by 14 publications

(5 citation statements)

References 59 publications

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“…The slight reductions can be ascribed to the release of water from the polycondensation of Si─OH and Al─OH groups and low content of kaolinite that could be dehydroxylated and transformed into reactive MK. Aforesaid temperature ranges in TGA/DTA results were in line with the studies in the literature 56–58 …”

Section: Resultssupporting

confidence: 89%

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Engineering performance of reinforced lightweight geopolymer concrete beams produced by ambient curing

Öztürk

2021

Structural Concrete

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The use of lightweight concrete can provide specific advantages that are favoring for mitigating seismic risk in building design. On the other hand, a significant reduction of carbon footprint could be possible through the use of geopolymer concrete. However, geopolymer concrete is mostly assessed through small specimens without reinforcement elements. This paper aims to couple the advantage of lightweight mixtures and ambient-cured geopolymerization in reinforced beams. To do this, engineering performance of reinforced lightweight geopolymer concrete was extensively investigated with different aspects. In mixtures, pumice and volcanic tuff aggregates were used with an appropriate gradation. Flexural strength, deflection capacities, initial stiffness, ductility, and energy dissipation capacity of reinforced geopolymer beams were investigated with the proposed configuration. Compressive strength and unit weight of the developed mixtures were also evaluated to meet design requirements for lightweight concrete. Results indicated that certain engineering properties (energy dissipation capacity and initial stiffness) of developed lightweight geopolymer concrete were considerably comparable with lightweight Portland cement-based concrete. Although compressive strength and unit weight of the developed geopolymer mixtures were satisfying, microstructural analysis indicated a weak bonding behavior between paste and lightweight aggregates.

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Section: Resultssupporting

confidence: 89%

“…Aforesaid temperature ranges in TGA/DTA results were in line with the studies in the literature. [56][57][58]…”

Section: Microstructural Analysismentioning

confidence: 99%

Engineering performance of reinforced lightweight geopolymer concrete beams produced by ambient curing

Öztürk

2021

Structural Concrete

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“…A mixture of a commercial potassium silicate (SiO 2 = 26.38%, K 2 O = 13.06%, H 2 O = 60.56%), analytical grade potassium hydroxide (KOH), and water was used as an alkaline activator. The cementitious material was formulated using the following molar ratios of oxides, as determined by previous studies: SiO 2 /Al 2 O 3 = 2.5 and K 2 O/SiO 2 = 0.28 [38,39]. To produce the geopolymer composite with photocatalytic and antibacterial properties, titanium oxide (TiO 2 ) and copper oxide (CuO) particles were added.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of the Antibacterial Activity of a Geopolymer Mortar Based on Metakaolin Supplemented with TiO2 and CuO Particles Using Glass Waste as Fine Aggregate

et al. 2020

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Metakaolin-based geopolymer cements were produced by alkaline activation with a potassium hydroxide and potassium silicate solution. To produce the geopolymer composites, 10 wt.% titanium oxide (TiO 2 ) and 5 wt.% copper oxide (CuO) nanoparticles were used. The geopolymer mortar was prepared using glass waste as fine aggregate. The raw materials and materials produced were characterized by X-ray diffraction, electron microscopy, and Fourier-transform infrared spectroscopy techniques. Likewise, the geopolymer samples were characterized to determine their physical properties, including their density, porosity, and absorption. The photocatalytic activity of the materials was evaluated by activating the nanoparticles in a chamber with UV-Vis light during 24 h; then, different tests were performed to determine the growth inhibition of Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa bacteria in nutrient agar for times of up to 24 h. The study results showed that a geopolymer mortar containing glass waste as fine aggregate (GP-G) exhibited a water absorption 56.73% lower than that of the reference geopolymer paste without glass (GP). Likewise, glass particles allowed the material to have a smoother and more homogeneous surface. The pore volume and density of the GP-G were 37.97% lower and 40.36% higher, respectively, than those of the GP. The study with bacteria showed that, after 24 h in the culture media, the GP-G mortars exhibited a high inhibition capacity for the growth of P. aeruginosa from solutions of 10 −4 mL and in solutions of 10 −6 mL for E. coli and S. aureus. These results indicate the possibility of generating antibacterial surfaces by applying geopolymer composite.

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“…Geopolymers are considered as materials that can replace Portland cement in some applications and their advantages include obtaining at low temperatures, acceptable compressive strength at short curing ages, good chemical and high temperatures resistances, as well as potential reduction of CO2 emissions (7,19,(21)(22)(23)(24)(25)(26). However, there are few studies on the use of geopolymer paste that may have potential applications as construction materials with thermal and acoustic insulation capacity.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, physical and thermoacoustic properties of lightweight composite geopolymers

Villaquirán-Caicedo

Perea

Ruiz

et al. 2021

inycomp

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This research evaluates the physical and mechanical properties of particulate composites, produced from geopolymer paste with the incorporation of different organic type wastes as expanded polystyrene (EP), corkwood (CK), tire rubber (RB); in percentages by volume of 2, 4, and 6%. Metakaolin was used as a precursor of the geopolymer produced by alkali activation from NaOH and sodium silicate. The geopolymer composites were cured at room temperature. Properties as density, porosity, absorption, compressive strength, thermal conductivity, and acoustic behavior were evaluated. As complementary techniques, light and scanning electron microscopy were used. It was observed that the high alkalinity of the geopolymer mixture causes deterioration of the CK particles. Composites with the incorporation of 4% of the EP and RB particles reported compressive strength of 32 and 45 MPa at 28 days, and apparent density of 1853 and 1922 kg/m3, respectively, which represents a reduction of 6.08% and 2.58% in comparison to the GP reference. The thermal conductivity for composites with 4% of EP and RB was 0.316 and 0.344 W/m.K and the sound absorption coefficient was evaluated at frequencies of 500 Hz, 0.70, and 0.50 respectively. The evaluated performance properties show the feasibility of using 4% of EP and RB for the manufacture of geopolymer composites for applications in thermal and sound insulating panels.

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

Cited by 14 publications

References 59 publications

Engineering performance of reinforced lightweight geopolymer concrete beams produced by ambient curing

Engineering performance of reinforced lightweight geopolymer concrete beams produced by ambient curing

Evaluation of the Antibacterial Activity of a Geopolymer Mortar Based on Metakaolin Supplemented with TiO2 and CuO Particles Using Glass Waste as Fine Aggregate

Mechanical, physical and thermoacoustic properties of lightweight composite geopolymers

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