Influence of SiC Sludge on the Microstructure of Geopolymers

Lin, Kae‐Long; Lo, Kang‐Wei; Cheng, Ta‐Wui; Lin, Wei‐Ting; Lin, Yang

doi:10.3390/ma13092203

Cited by 7 publications

(15 citation statements)

References 27 publications

(36 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Microstructural research shows a typical morphology for reinforced geopolymers with fibers [ 43 , 44 , 45 ]. Short fibers are regularly dispersed in all volumes of the matrix and are consistent with them.…”

Section: Resultsmentioning

confidence: 99%

Development and Characterization of Lightweight Geopolymer Composite Reinforced with Hybrid Carbon and Steel Fibers

et al. 2021

View full text Add to dashboard Cite

The aim of this paper is to analyze the influence of hybrid fiber reinforcement on the properties of a lightweight fly ash-based geopolymer. The matrix includes the ratio of fly ash and microspheres at 1:1. Carbon and steel fibers have been chosen due to their high mechanical properties as reinforcement. Short steel fibers (SFs) and/or carbon fibers (CFs) were used as reinforcement in the following proportions: 2.0% wt. CFs, 1.5% wt. CFs and 0.5% wt. SFs, 1.0% wt. CFs and 1.0% wt. SFs, 0.5% wt. CFs and 1.5% wt. SFs and 2.0% wt. SFs. Hybrid reinforcement of geopolymer composites was used to obtain optimal strength properties, i.e., compressive strength due to steel fiber and bending strength due to carbon fibers. Additionally, reference samples consisting of the geopolymer matrix material itself. After the production of geopolymer composites, their density was examined, and the structure (using scanning electron microscopy) and mechanical properties (i.e., bending and compressive strength) in relation to the type and amount of reinforcement. In addition, to determine the thermal insulation properties of the geopolymer matrix, its thermal conductivity coefficient was determined. The results show that the addition of fiber improved compressive and bending strength. The best compressive strength is obtained for a steel fiber-reinforced composite (2.0% wt.). The best bending strength is obtained for the hybrid reinforced composite: 1.5% wt. CFs and 0.5% wt. SFs. The geopolymer composite is characterized by low thermal conductivity (0.18–0.22 W/m ∙ K) at low density (0.89–0.93 g/cm3).

show abstract

Section: Resultsmentioning

confidence: 99%

Development and Characterization of Lightweight Geopolymer Composite Reinforced with Hybrid Carbon and Steel Fibers

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The mechanical properties of the three specimens were evaluated and expressed. Finally, the samples were analyzed at appropriate curing times by DTA/TG and 29 Si MAS NMR analyses. The heat evolution in the geopolymerization reactions, such as dissolution, polymerization, and condensation, were characterized by an isothermal conduction calorimeter (Calmetrix I-CAL 2000 HPC, Boston, MA, USA) conducted at a constant temperature of 30 ± 0.02 • C for 168 h, according to ASTM C1702.…”

Section: Methodsmentioning

confidence: 99%

Section: Si Nmr Spectra and Deconvolutions Of Geopolymers With Sic Sl...mentioning

confidence: 99%

“…To further validate the evolution of chemical reactions in geopolymerization with SiC sludge, 29 Si NMR analyses were conducted on the geopolymer samples. The 29 Si NMR spectra analysis enables the short-range ordering and molecular structure in the geopolymerization reaction to be determined [25]. In the initial stage, geopolymerization involved the release of the silicate derivatives (Q 1 , Q 2 , and Q 3 ) in the solution by alkaline activation.…”

Section: Si Nmr Spectra and Deconvolutions Of Geopolymers With Sic Sl...mentioning

confidence: 99%

“…Figure 4 displays the 29 Si NMR spectra and deconvolutions of SiC sludge geopolymers with 28 days of curing. After 28 days of curing, the spectra of 0.8NS0SCS revealed a high percentage of Q 4 (3Al), thus indicating a high initial level of aluminosilicate.…”

Section: Si Nmr Spectra and Deconvolutions Of Geopolymers With Sic Sl...mentioning

confidence: 99%

See 2 more Smart Citations

Utilization of Silicon Carbide Sludge as Metakaolin-Based Geopolymer Materials

Lin

Cheng

et al. 2020

Sustainability

Self Cite

View full text Add to dashboard Cite

The recycling of SiC sludge material is crucial for resource reutilization and environmental protection. In the current study, the effect of the mass ratio between the Na2SiO3 and sodium hydroxide (NaOH) solutions (NS/SS ratio) and the effect of SiC sludge on metakaolin geopolymers was comprehensively investigated to determine the underlying performance of the geopolymerization system. During thermal evolution, the second exothermic peak of 1.6NS10SCS (NS/SS ratio: 1.6, 10% SiC sludge) showed a heat evolution value of 990.6 W/g, which was the highest among other geopolymers. Additionally, the 1.6NS10SCS sample after 28 days of curing showed the highest flexural strength (6.42 MPa), compared to that of the others, and the DTA/TG (differential thermal analysis/thermogravimetry) results showed that the weight loss percentage increased to 14.62% from 400 to 750 °C. For the 29Si nuclear magnetic resonance deconvolution, 1.6NS10SCS exhibited high fractions of Q4(3Al) (33.63%), Q4(2Al) (23.92%), and Q4(1Al) (9.70%). Thus, the geopolymer with the optimal SiC-sludge replacement level and NS/SS ratio contained more macropores and geopolymer gels, which benefit structural development. The experimental results indicated that SiC-sludge can potentially serve as a partial replacement for metakaolin and exhibited favorable mechanic characteristics.

show abstract

Environmental degradation of foamed geopolymers

Korniejenko

Figiela

Kozub

et al. 2022

Continuum Mech. Thermodyn.

View full text Add to dashboard Cite

Modern materials used in civil engineering should fulfill the numerous of requirements connected building standards, but not only. They should also be ecological and durable. Geopolymers are characterized by very good mechanical properties, high resistance against acids, chlorides and sulfates, high thermal resistance, and other properties confirmed by previous research. There is still a few amount of research connected with resistance, this materials for different environmental conditions, especially a lack of investigation connected with foamed geopolymers in this area. The main objective of the article is to analyze the possibilities of the development of new foamed geopolymer composites to increase durability, especially against degradation in corrosive water environments. This paper presents the influence on the mechanical properties of foamed geopolymer composites on the water environment. As raw materials, fly ash from the coal power plant ‘Skawina’ (located in: Skawina, Lesser Poland, Poland) and metakaolin (Czech Republic) were used. The chemical composition of the fly ash is typical for class F. Additionally, the composites were reinforced by flax fiber. Solid and foam samples were prepared. As a foaming agent, hydrogen peroxide (H$$_{2}$$ 2 O$$_{2})$$ 2 ) was applied. The following research methods were applied: compressive strength, flexural strength, porosity measurements, water absorption in fresh and salt water. The results show that, however, environmental conditions have a significant influence on the mechanical properties of geopolymer composites; the geopolymer composites can be successfully produced with the addition of natural fibers and have good strength parameters even after long-term use (materials were tested after 360 days).

show abstract

Influence of SiC Sludge on the Microstructure of Geopolymers

Cited by 7 publications

References 27 publications

Development and Characterization of Lightweight Geopolymer Composite Reinforced with Hybrid Carbon and Steel Fibers

Development and Characterization of Lightweight Geopolymer Composite Reinforced with Hybrid Carbon and Steel Fibers

Utilization of Silicon Carbide Sludge as Metakaolin-Based Geopolymer Materials

Environmental degradation of foamed geopolymers

Contact Info

Product

Resources

About