Geopolymer mortars based on natural zeolite

Nikolov, Aleksandar; Barbov, Borislav; Tacheva, Elena

doi:10.52215/rev.bgs.2021.82.3.25

Cited by 4 publications

(6 citation statements)

References 8 publications

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“…can make a direct contribution of portlandite content in the AAM systems. Likewise, an insignificant amount of calcite (CaCO3) in the AAMs systems was observed possibly due to the reaction of calcium species with the carbon dioxide from air in presence of an aqueous alkali activator [70,78]. Similarly, the presence of zeolite phase was expected in these types of AAM systems.…”

Section: Quantitative X-ray Diffraction (Qxrd) Analysis Of the Aams S...mentioning

confidence: 89%

“…The small band at about 1380 cm -1 was assigned to the nitrates that resulted from the preparation method of the calcium hydrolyzed nano-solutions [70]. A moderate intensity band occurred at 835 cm -1 , possibly corresponding to the Si-O bond symmetric stretching vibrations [78]. However, this vibration may have overlapped the signal at 830 cm -1 assigned to the bending mode of NO3 - [83,84].…”

Section: Ftir Characterization Of the Aams Systemsmentioning

confidence: 98%

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Production and Incorporation of Calcium Hydrolyzed Nano-particles in Alkali-Activated Mine Tailings

Perera-Mercado¹,

Zhang²,

Hedayat³

et al. 2023

Preprint

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This work presents the production and incorporation of calcium hydrolyzed nano-solutions at three concentrations (1, 2, and 3 wt.%) in alkali-activated gold mine tailings (MTs) from Arequipa, Perú. A first activator solution of sodium hydroxide (NaOH) at 10M was used. The calcium hy-drolyzed nano-solutions acted as a secondary activator and as additional calcium resource for the alkali-activated materials (AAMs) based on the low-calcium gold MTs. High-resolution trans-mission electron microscopy/energy-dispersive x-ray spectroscopy (HR-TEM/EDS) analyses were carried out to characterize the morphology, size, and structures of the calcium hydrolyzed na-noparticles. Fourier transform infrared (FTIR) analyses then were used to understand the chemical bonding interactions in the calcium hydrolyzed nanoparticles and in the AAMs. Scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS) and Quantitative X-ray diffraction (QXRD) were performed to study the structural, chemical, and phase compositions of the AAMs; uniaxial compressive tests evaluated the compressive strength of the reacted AAMs; and Nitrogen adsorption-desorption analyses measured the porosity changes at nanostructure level in the AAMs. The results indicate that each increase in the concentration of the calcium hydrolyzed nano-solution had a direct/proportional effect on the mechanical properties of the AAMs samples. The AAMs with 3 wt.% calcium-hydrolyzed nano-solution had the highest compressive strength value of 15.16 MPa, which represented an increase of 62% compared to the original system without nanoparticles and aged under the same conditions of 70°C for seven days. These results provide useful information about the positive effect of calcium-hydrolyzed nanoparticles on gold MTs and their conversion into sustainable building materials through alkali activation.

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Section: Quantitative X-ray Diffraction (Qxrd) Analysis Of the Aams S...mentioning

confidence: 89%

Section: Ftir Characterization Of the Aams Systemsmentioning

confidence: 98%

Production and Incorporation of Calcium Hydrolyzed Nano-particles in Alkali-Activated Mine Tailings

Perera-Mercado¹,

Zhang²,

Hedayat³

et al. 2023

Preprint

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“…Si-O-P-O-Si-O-Fe in acidic mediums. Consequently, iron-containing raw materials are emerging as promising precursors for geopolymers [40][41][42].…”

Section: Geopolymer Synthesismentioning

confidence: 99%

“…Other important ratios, such as M₂O/SiO₂, M₂O/Al₂O₃, and H₂O/M₂O, also play significant roles in geopolymerization. The SiO₂/Na₂O ratio, for instance, affects mechanical properties and microstructure, while the Na₂O/Al₂O₃ ratio influences the dissolution of silica and alumina species [39,42]. The M₂O/H₂O ratio impacts the dissolution of aluminum and silicate species, thus affecting compressive strength.…”

Section: Key Ratios In Geopolymer Formation and Propertiesmentioning

confidence: 99%

Geopolymer Cement in Pavement Applications: Bridging Sustainability and Performance

Ikotun,

Aderinto,

Madirisha

et al. 2024

Sustainability

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Sustainability and the quest for a more robust construction material cannot be divorced from each other. While Portland cement has revolutionized the construction sector, its environmental toll, particularly in greenhouse gas emissions and global warming, cannot be ignored. Addressing this dilemma requires embracing alternatives like geopolymer cement/geopolymer binder (GPC/GPB). Over the last few decades, considerable strides have been achieved in advancing GPC as a sustainable construction material, including its utilization in pavement construction. Despite these advances, gaps still exist in GPC optimal potential in pavement construction, as most studies have concentrated on specific attributes rather than on a comprehensive evaluation. To bridge this gap, this review adopts a novel, holistic approach by integrating environmental impacts with performance metrics. To set the stage, this review first delves into the geopolymer concept from a chemistry perspective, providing an essential broad overview for exploring GPC’s innovations and implications in pavement applications. The findings reveal that GPC not only significantly reduces greenhouse gas emissions and energy consumption compared to Portland cement but also enhances pavement performance. Further, GPC concrete pavement exhibits superior mechanical, durability, and thermal properties to ensure its long-term performance in pavement applications. However, challenges to GPC utilization as a pavement material include the variability of raw materials, the need for suitable hardeners, the lack of standardized codes and procedures, cost competitiveness, and limited field data. Despite these challenges, the process of geopolymerization presents GPC as a sustainable material for pavement construction, aligning with Sustainable Development Goals (SDGs) 3, 9, 11, and 12.

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“…The application of protective coatings to concrete surfaces is widely employed as a common method to prolong the lifespan of buildings and preserve the structural integrity of constructions within current engineering practices [9][10][11][12]. Geopolymer materials are a novel type of inorganic binder prepared through an alkali-silica/alumina reaction and are characterized by chemical resistance, strong adhesion, and environmental friendliness [13][14][15][16][17][18][19][20][21], making them highly applicable in the formulation of protective coatings for concrete surfaces. In recent decades, extensive research has been conducted on the practical application of geopolymer coatings [7,[22][23][24][25][26], with sagging identified as one of the significant issues encountered in current applications.…”

Section: Introductionmentioning

confidence: 99%

Improving Sag Resistance in Geopolymer Coatings Using Diatomite Filler: Effects on Rheological Properties and Early Hydration

Hu,

Jin,

Pang

et al. 2024

Materials

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The reduction in the rheological parameters and dissolution rate of precursors in geopolymer coatings during early hydration significantly contributes to sagging. This study aims to improve the sag resistance of these coatings by incorporating diatomite filler. Rheological testing was conducted to assess the impact of diatomite and its concentration on the yield stress, plastic viscosity, and thixotropy of the geopolymer coatings. The results indicated that diatomite’s large specific surface area and high reactivity have a significant influence on the rheological parameters and early dissolution rate of precursors. With a diatomite concentration of 1.1%, the coating exhibited a yield stress of 2.749 Pa and a plastic viscosity of 0.921 Pa·s, maintaining stability, homogeneity, and no sagging at a thickness of 600 μm. Furthermore, the highly active SiO2 in diatomite participates in the secondary hydration reaction of the geopolymer materials led to the formation of substantial C-(A)-S-H gel. This gel enhances internal interconnectivity within the coating, thereby improving its rheological and mechanical properties.

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Geopolymer mortars based on natural zeolite

Cited by 4 publications

References 8 publications

Production and Incorporation of Calcium Hydrolyzed Nano-particles in Alkali-Activated Mine Tailings

Production and Incorporation of Calcium Hydrolyzed Nano-particles in Alkali-Activated Mine Tailings

Geopolymer Cement in Pavement Applications: Bridging Sustainability and Performance

Improving Sag Resistance in Geopolymer Coatings Using Diatomite Filler: Effects on Rheological Properties and Early Hydration

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