A study on electrical conductivity of chemosynthetic Al2O3–2SiO2 geoploymer materials

Cui, Xuemin; Zheng, Guangjian; Yaocong, Han; Su, Feng; Zhou, Ji

doi:10.1016/j.jpowsour.2008.03.021

Cited by 102 publications

(50 citation statements)

References 12 publications

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“…The FA geopolymer paste with an L/A ratio of 0.4 gives the highest level of electrical conductivity up to 10 3 S/cm comparing with lower values around 910 4 , 710 4 , and 510 4 S/cm of geopolymer pastes with the L/A ratios of 0.6, 0.5, and 0.7, respectively. It has been reported that a material with an ionic electrical conductivity higher than the level of 10 6 S/cm is expected to be suitable for being developed as a fast ionic conductor [9].…”

Section: Electrical Properties Of Geopolymer Pastesmentioning

confidence: 99%

“…Usually, the accustomed viewpoint is that alkali metal ions play a charge-balancing role or are actively bonded to the matrix. Hence, the typical geopolymer composition is usually expressed as nM 2 OAl 2 O 3 xSiO 2 yH 2 O (M is an alkali metal element such as Li, Na, or K) [9].…”

Section: Introductionmentioning

confidence: 99%

“…The geopolymeric material is easy to synthesize and is close to the zeolitic-like material due to the similar molecular structure, but it contains mainly amorphous phase. Cui et al [9] reported that the synthesized geopolymer possessed a high electrical conductivity of 1.510 6 S/cm at room temperature. Such a high level of electrical conductivity is expected to play an important role in fast ionic conduction used for solid-state batteries and electrochemical sensors.…”

Section: Introductionmentioning

confidence: 99%

“…Water molecules and hydroxide contained in geopolymer materials are the most important factors influencing their electrical conductivity and dielectric property at room temperature [9]. Free alkali metal ions are also expected to play a role in the electrical properties of geopolymer materials.…”

Section: Introductionmentioning

confidence: 99%

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Electrical conductivity and dielectric property of fly ash geopolymer pastes

Hanjitsuwan

Chindaprasirt

Pimraksa

2011

Int J Miner Metall Mater

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The electrical conductivity and dielectric property of fly ash geopolymer pastes in a frequency range of 100 Hz-10 MHz were studied. The effects of the liquid alkali solution to ash ratios (L/A) were analyzed. The mineralogical compositions and microstructures of fly ash geopolymer materials were also investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The 10 mol sodium hydroxide solution and sodium silicate solution at a sodium silicate-to-sodium hydroxide ratio of 1.0 were used in making geopolymer pastes. The pastes were cured at 40C. It is found that the electrical conductivity and dielectric constant are dependent on the frequency range and L/A ratios. The conductivity increases but the dielectric constant decreases with increasing frequency.

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Section: Electrical Properties Of Geopolymer Pastesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electrical conductivity and dielectric property of fly ash geopolymer pastes

Hanjitsuwan

Chindaprasirt

Pimraksa

2011

Int J Miner Metall Mater

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“…It is believed that Na+ ion mobility within geopolymers is strongly supported by moisture that resides in the pore solution. Geopolymers can thus exhibit an electrolytic conductivity that depends on measurands that impede or encourage Na+ ion mobility, such as strain, temperature, moisture and other contaminant ions [18].…”

Section: Fly Ash Geopolymersmentioning

confidence: 99%

Smart cements: repairs and sensors for concrete assets

Biondi

Perry

Vlachakis

et al. 2018

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2018

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Smart cements offer a unique opportunity to unify our approach to the remote monitoring and repair of concrete assets. Here, we present our latest progress in manufacturing and testing smart cement sensor-repairs based on fly ash geopolymers -a novel class of cement-like binders that cure to a strong, chemically resistant, electrically conductive shell. Since chloride and moisture are two of the leading causes of degradation of reinforced concrete, we are proposing a technology that is able to monitor chloride ingress into concretes at different levels of moisture. The main task of the work was to manufacture geopolymer binders for concrete specimens, and to cure them at ambient temperatures. We have studied how practical considerations, such as the concrete substrate's maturity, can affect how or whether smart cements can be applied, thus understanding the main limitations of the technology. By using electrical impedance measurements, we aim to demonstrate that geopolymer skin layers can provide high resolution monitoring of chloride contamination at different levels of moisture. Here we present results which show that smart cements are sensitive to changes in humidity of the surrounding environment. Our goal is to develop a robust and field-worthy technology which unifies civil monitoring and maintenance. This goal is of key national importance to the US and many countries within Europe, who now face an ageing population of reinforced concrete bridges, tunnels and support structures.

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Inorganic Polymers (Geopolymers)

MacKenzie

2017

Encyclopedia of Polymer Science and Technology

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Geopolymers are ceramic-like inorganic polymers produced at low temperature, generally below 100 °C. They consist of chains or networks of mineral molecules linked with covalent bonds. The raw materials are mainly minerals of geological origin, hence the name "geopolymer". They comprise several molecular units for example: silico-oxide (Na,K)-(-Si-O-Si-O-) for (Na,K)-poly(silicate) or (Na,K)-poly(siloxonate), silico-aluminate (Na,K)-(-Si-O-Al-O) for (Na,K)poly(sialate), ferro-silico-aluminate (Na,K)-(-Fe-O-Si-O-Al-O-) or (Na,K)-poly(ferro-sialate), alumino-phosphate (-Al-O-P-O-) for poly(alumino-phosphate), formed in a geopolymerization process. We focus here on the reactivity of calcined kaolinite, an aluminosilicate oxide Si 2 O 5 Al 2 O 2 , metakaolin, which led to the discovery of geopolymers 40 years ago. A distinction is made between two synthesis routes: alkaline medium (Na+, K+, Li+, Ca++, Cs+ and the like) and acidic milieu (phosphoric acid, organic carboxylic acids). The alkaline route is the most important, so far. NMR spectroscopy provides data on the molecular structure and polymeric character. The geopolymerization mechanism starts with polycondensation of oligomers into small ribbon-like molecules. This intermediary stage involves several Si-OH groups together with H 2 O molecules. It is referred to as NASH or KASH by some cement scientists and generalized to the final geopolymer structure. The poly(sialate) final structure consists of well-polymerized individual elementary nanoparticles of 5 to 40 nm in size.

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A study on electrical conductivity of chemosynthetic Al2O3–2SiO2 geoploymer materials

Cited by 102 publications

References 12 publications

Electrical conductivity and dielectric property of fly ash geopolymer pastes

Electrical conductivity and dielectric property of fly ash geopolymer pastes

Smart cements: repairs and sensors for concrete assets

Inorganic Polymers (Geopolymers)

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