Durability performances of wollastonite, tremolite and basalt fiber-reinforced metakaolin geopolymer composites under sulfate and chloride attack

Ren, Daming; Yan, Chunjie; Duan, Ping; Zhang, Zuhua; Li, Lingyao; Yan, Zhongyun

doi:10.1016/j.conbuildmat.2016.12.103

Cited by 140 publications

(50 citation statements)

References 38 publications

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“…Because of the expanded products formed as a result of the combination of calcium and sulfate, cracks and porous structures in the high calcium containing materials based geopolymers occur. In previous studies, the reason for the excellent resistance of the geopolymer materials against sulfate has been attributed to the low Ca content in the source materials and to more stable cross‐linked aluminosilicate polymer structures . When the strength reductions of geopolymer concrete samples immersed in salt and sulfate solutions compared, salt solutions resulted in less strength loss in samples.…”

Section: Resultsmentioning

confidence: 99%

“…These reductions are in good agreement with literature and could be explained as follows. Ren et al reported that as the concentration of sodium chloride solutions increased, the compressive strength of the samples decreased. They pointed out that mineral admixtures increase the compressive strength of the geopolymer against salt attack.…”

Section: Resultsmentioning

confidence: 99%

“…Sodium hydroxide interacting with sodium sulfate negatively affected the compressive strength of geopolymer by filtering through geopolymer concrete . Ren et al stated that as the concentration of sodium sulfate solutions increased, the compressive strength of the samples decreased. They indicated that the mineral admixtures increased the compressive strength of the geopolymer against sulfate attacks.…”

Section: Resultsmentioning

confidence: 99%

“…All SEM images indicated that calcium silicate hydrate gels were dispersed intensively and evenly. When the sulfate and chloride ions in the solution enter into the geopolymer sample, they form expanded products and crystals that cause cracking and high porosity in the microstructure of the geopolymer sample …”

Section: Resultsmentioning

confidence: 99%

“…Yusuf produced geopolymer mortar samples by activating palm oil fuel ash and ground steel slag with sodium hydroxide and sodium silicate. Ren et al produced samples metakaolin based geopolymer added wollastonite, tremolite, and short basalt fiber composition at different rates. Kwasny et al produced solid clay based geopolymer mortar samples with two different compressive strengths (37.5 and 60 MPa).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of sulfate and salt resistance of ferrochrome slag and blast furnace slag‐based geopolymer concretes

Özcan

Karakoç

2019

Structural Concrete

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In this study, mechanical, visual, and microstructure changes of geopolymer concrete exposed to sulfate and salt effects were investigated. Elazı g ferrochrome slag (EFS) and blast furnace slag (BFS)-based geopolymer concretes which completed curing time were immersed in 5% sodium sulfate (Na 2 SO 4 ), magnesium sulfate (MgSO 4 ), sodium chloride (NaCl), and magnesium chloride (MgCl 2 ) solutions for 12 weeks. The compressive strength values, ultrasonic pulse velocities, visual inspections, weight, and length changes of the samples were determined in this investigation. In addition, scanning electron microscopy was performed for the microstructure analysis of the samples removed from the solutions. Sulfate solutions had a more negative effect on the samples than salt solutions. As the EFS ratio in the mixture increases, the loss rate in the strength of the samples exposed to sulfate and salt solutions decreased. While samples exposed to sodium chloride, sodium sulfate, and magnesium sulfate solutions occurred weight gain, samples exposed to magnesium chloride occurred weight loss. The samples in salt solutions shrank, while the samples in sulfate solutions expanded. No deterioration occurred on the surfaces of the samples exposed to the solutions for 12 weeks. K E Y W O R D S blast furnace slag, chemical resistance, ferrochrome slag, geopolymer concrete, salt effect, sulfate effect

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evaluation of sulfate and salt resistance of ferrochrome slag and blast furnace slag‐based geopolymer concretes

Özcan

Karakoç

2019

Structural Concrete

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Mechanical properties and durability of fiber reinforced geopolymer composites: A review on recent progress

Qin,

Yan,

Zhou

et al. 2023

Engineering Reports

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Geopolymer concrete has similar mechanical properties to ordinary Portland cement (OPC) concrete, and even better properties in high temperature, high corrosion environment. However, geopolymer still has the disadvantages of large shrinkage and high brittleness, which greatly limit its application. Fiber reinforcement is widely used in various geopolymer systems to overcome the brittleness issue, but still retains the high strength. Over the past 10 years, great progress has been made in the research of fiber reinforced geopolymers in the aspect of toughening efficiency and durability improvement. Many studies have been conducted on fiber reinforced geopolymers, but there are still few systematic summaries on the addition of inorganic fibers and organic fibers to geopolymers. What is more there are many novel studies such as the application of geopolymers to 3D printing and the new concept of fiber factor have not been reviewed. In this paper, inorganic fibers, natural fibers and synthetic fibers in geopolymers are briefly reviewed, and their specific effects on geopolymers' compressive, flexural, tensile strength, fracture toughness, shear strength and durability such as shrinkage, chemical resistance, freeze–thaw resistance are reviewed. The current understanding of bonding mechanism and fiber‐geopolymer interface are also discussed, and related knowledge gaps and future work challenges are correspondingly pointed out.

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Development of fungal biocomposites for construction applications

Brudny,

Łach,

Kozub

et al. 2024

Materialwissenschaft Werkst

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Mycelium materials represent a new class of environmentally friendly materials for structural applications that can grow on low‐cost organic waste while achieving satisfactory thermal or acoustic insulation properties. The aim of this study is to grow a biocomposite of mycelium on flax tows and then use it as a reinforcement with a geopolymer matrix. To achieve this, three species of mycelium were selected, a culture process was carried out, and then samples of the composite were synthesized with a geopolymer matrix. To determine the utility in terms of structural applications, the density, compressive strength, and thermal conductivity of the samples were tested. Scanning electron microscope images were also taken to observe the microstructure. The results indicate that it is possible to produce a mycelium composite with a geopolymer matrix. A lower density was achieved for all samples than for the geopolymer without reinforcement. The coefficient of thermal conductivity was reduced only for the sample with one of the mycelia. The compressive strength for biocomposites was between 12.1 MPa–14.2 MPa, this value is enough for some engineering applications.

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Durability performances of wollastonite, tremolite and basalt fiber-reinforced metakaolin geopolymer composites under sulfate and chloride attack

Cited by 140 publications

References 38 publications

Evaluation of sulfate and salt resistance of ferrochrome slag and blast furnace slag‐based geopolymer concretes

Evaluation of sulfate and salt resistance of ferrochrome slag and blast furnace slag‐based geopolymer concretes

Mechanical properties and durability of fiber reinforced geopolymer composites: A review on recent progress

Development of fungal biocomposites for construction applications

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