Cold-pressed fly ash geopolymers: effect of formulation on mechanical and morphological characteristics

Shee-Ween, Ong; Cheng-Yong, Heah; Yun-Ming, Liew; Abdullah, Mohd Mustafa Al Bakri; Ngee, Ho Li; Chan, Lynette Wei Ling; Wan-En, Ooi; Jaya, Nur Ain; Yong-Sing, Ng

doi:10.1016/j.jmrt.2021.09.084

Cited by 24 publications

(3 citation statements)

References 45 publications

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“…In most of the studies, the A/P is more than 0.4., and this has also been verified by the histogram mentioned in Appendix A. A lower activator value means there are unreacted precursor particles, and if the dosage of the activator is higher, then there will be congestion in the paste and the strength will be reduced [14,15]. Similarly, another parameter that influences the strength of the geopolymer is the SS/SH ratio.…”

Section: Introductionmentioning

confidence: 64%

“…Very interesting results were obtained with a low DS content (20% DS): the strength was reduced by more than 50% (26.5 to 12.2 MPa) by increasing the SS/SH from 1.5 to 2.5. The reduction in the strength was due to the congestion of large amounts of SiO 2 and Na + in the matrix, which resist the geo-polymerization process [15]. However, for the case using 60% DS, the strength was increased from 19.6 MPa to 26.3 MPa by increasing SS/SH from 1.5 to 2.5, respectively.…”

Section: Incorporation Of Dune Sandmentioning

confidence: 98%

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Enhancing Strength and Quantifying Sustainability of Building Blocks Manufactured by Geopolymerization

Mawra,

Rashid,

Irfan-ul-Hassan

et al. 2024

Materials

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Enhancing the strength of fly ash (FA)-based geopolymer by increasing the alkaline activator content is a costly and unsustainable technique. Therefore, this work was designed to reduce the activator by employing the pressured catalysis (PC) technique, coupled with the use of minerals that have filler and occupying effects. The main objective was to enhance the strength of the mix with a lower alkaline-to-precursor (A/P) ratio and create a sustainable, load-bearing building block from it. Initially, the compressive strength of the FA-based geopolymer was investigated experimentally by varying sodium silicate to sodium hydroxide and A/P ratios with ambient and hot curing. Afterward, PC was applied to the optimized proportion of constituents, and a significant increase in strength (9.6 to 20.0 Mpa) was observed at a 0.25 A/P ratio. By adding clay and dune sand (DS), the compressive strength was 19.5 and 40.4 Mpa at an A/P of 0.25 and 0.16, respectively. The strength gain mechanism was evaluated at the molecular and micro levels by conducting FTIR and SEM analyses. The environmental and economic indices and strength indicated the high sustainability of DS-based geopolymers compared to analogous blocks. The environmental and economic benefits of 23.9% reduced CO2 emissions and 24.2% less cost were provided by the DS-based block compared to the FA–clay-based block. A DS-based geopolymer obtains strength at a low A/P due to its occupying effect and results in sustainable building blocks.

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Section: Introductionmentioning

confidence: 64%

Section: Incorporation Of Dune Sandmentioning

confidence: 98%

Enhancing Strength and Quantifying Sustainability of Building Blocks Manufactured by Geopolymerization

Mawra,

Rashid,

Irfan-ul-Hassan

et al. 2024

Materials

View full text Add to dashboard Cite

show abstract

“…The bulk density (B, g/cm 3 ) and apparent porosity (P, %) of geopolymer were calculated according ASTM C20-00 (2010) by equations ( 1) and ( 2) [25]. All data for compressive strength, porosity, and density from three sample experiments (n = 3) were represented as mean value and standard deviation.…”

Section: Testing and Analysis Methodsmentioning

confidence: 99%

Effect of Nano-Zirconia Addition on Mechanical Properties of Metakaolin-Based Geopolymer

Saukani¹,

Lisdawati²,

Irawan³

et al. 2022

Preprint

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Geopolymer is an emerging material alternative to Portland cement and has potential as a refractory material. Adding filler in geopolymer material is a strategy to increase the advantages of its physical and mechanical properties. It has been previously reported that adding nanoparticles can increase the compressive strength value, but there is no reported interaction between nanoparticles and geopolymer during the geopolymerization process. This study aims to study the effect of adding nano-zirconia fillers on the physical and mechanical changes of metakaolin-based geopolymers with nano-zirconia fillers. The geopolymer paste was prepared with 100 g of metakaolin as the base material and added with variations of nano-zirconia 2gr, 5gr, 10 gr, and 15 gr. Further characterization was carried out by XRD, FTIR, SEM-EDX, and DTA-TG. This study showed that the compressive strength of the MZr05 sample increased significantly by 58.7% compared to the control sample. The test results of the structure and functional groups did not lead to any new compounds formed in the geopolymerization reaction. Therefore, the interaction of metakaolin geopolymer with nano-zirconia only creates an interfacial bonding.

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Strength and durability properties of alkali-activated concrete comprising glass fibers

Arunachelam¹,

Chellapandian²,

Maheswaran

et al. 2023

Advanced Fiber-Reinforced Alkali-Activated Composites

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Cold-pressed fly ash geopolymers: effect of formulation on mechanical and morphological characteristics

Cited by 24 publications

References 45 publications

Enhancing Strength and Quantifying Sustainability of Building Blocks Manufactured by Geopolymerization

Enhancing Strength and Quantifying Sustainability of Building Blocks Manufactured by Geopolymerization

Effect of Nano-Zirconia Addition on Mechanical Properties of Metakaolin-Based Geopolymer

Strength and durability properties of alkali-activated concrete comprising glass fibers

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