Ionic conductive and photocatalytic properties of cementitious materials: calcium silicate hydrate and calcium aluminoferrite

Nagao, Masahiro; Kobayashi, Kazuyo; Jin, Yongcheng; Maruyama, Isao; Hibino, Takashi

doi:10.1039/d0ta04866f

Cited by 14 publications

(10 citation statements)

References 49 publications

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“…33-0306). 10 The crystalline phase was identified as brownmillerite (C 4 AF; JCPDS: no. 71-0667) 10 on the basis of the peaks at 2 θ = 33.317°, 33.718°, 43.909°, and 46.889° corresponding to the crystal planes (002), (141), (161), and (202).…”

Section: Resultsmentioning

confidence: 99%

“…The above phenomenon causes significant environment pollution and represents a serious waste of resources. It has been reported that CSH prepared by pure elements are major charge carriers, 10 mainly hydroxide ions as basic O–H groups present in the mesopores. More than that, CSH possess a large specific surface area.…”

Section: Introductionmentioning

confidence: 99%

“…The diffraction peaks at 2y = 29.3551, 32.0531, and 50.0771 could be indexed as the characteristic crystal plane of calcium silicate hydrate (CSH; JCPDS: no. 33-0306) 10. The crystalline phase was identified as brownmillerite (C 4 AF; JCPDS: no.…”

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confidence: 99%

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Section: Resultsmentioning

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Section: Introductionmentioning

confidence: 99%

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“…While, keeping in mind that the separator in a supercapacitor should be an ionic conductive material, besides being porous, the ionic conductivity of the hardened concrete/cement paste [66] can be improved by incorporating additional alkaline materials/salts. As the water/cement ratio controls the porosity of concrete/cement paste, the desired porosity for high ionic movement in the supercapacitor applications can be optimized.…”

Section: Use Of Construction Materials As Supercapacitorsmentioning

confidence: 99%

Construction Building Materials as a Potential for Structural Supercapacitor Applications

Basha

Shah

Ahmad

et al. 2022

The Chemical Record

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Emerging demands to achieve zero carbon emissions and develop renewable energy resources necessitate the development of appropriate energy storage systems. To achieve this, several alternatives to conventional energy storage devices, such as Li‐ion batteries or capacitors to more sustainable and scalable energy storage systems, are being explored. Supercapacitors, possess unique characteristics that include high power, long life, and environmental‐friendly design. They may be used to bridge the energy‐power gap between typical capacitors and fuel cells/batteries. Recently, structural supercapacitors being capable of storing electrochemical energy besides bearing mechanical load have caught the attention of researchers. As such, efforts have been made worldwide to study both the fundamental and applied aspects of structural supercapacitors. Further, the possibility of using construction materials for interdisciplinary applications is being studied because they are relatively cheap and easily available. Thus, construction materials can be considered as potential candidates for the development of structural supercapacitors. Herein an overview on the use of construction materials, such as Portland cement concrete, geopolymer concrete, and bricks, as a component of structural supercapacitors has been presented.

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“…When water content increases, the ion transfer is facilitated due to the high Table 7 Calculation process for the degree of carbonation. ion conductivity of dissolved calcium silicate hydrate (Nagao et al 2020), and thus, the mortar resistance decreases ( Fig. 12) and corrosion rate increases (Fig.…”

Section: Correlation Between Water Content Mortar Resistance and Comentioning

confidence: 99%

Novel Accelerated Test Method for RH Dependency of Steel Corrosion in Carbonated Mortar

Cheng

Maruyama

Yuqi

2021

ACT

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Degradation of reinforced concrete (RC) structures can occur through the carbonation-induced corrosion of reinforcing bars, and this process is a major concern for the durability of RC buildings. Structures located in relatively humid inland environments are especially vulnerable. Therefore, it is important to clarify how relative humidity (RH) affects steel corrosion rates in carbonated concrete. In this study, a novel accelerated test method is presented, which shortens the experimental duration and simplifies the experimental method. A miniaturized specimen was created with 20 × 20 × 40 mm 3 dimensions and an effective carbonation depth of only 5 mm. The corrosion rate of rebar in the small mortar specimens was studied at different equilibrium RH conditions, which were controlled using saturated salt solutions. The accelerated carbonation process was found to be much faster than in traditional concrete experiments. Finally, the relationship between water content (as a function of RH) and corrosion rate showed that the corrosion rate of rebar in carbonated mortar has a strong dependency on RH. The relationship between the mortar resistance and the corrosion rate indicated that the corrosion process of rebar in carbonated mortar is under resistive control when RH above 80%, and under anodic control when RH below 80%.

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Ionic conductive and photocatalytic properties of cementitious materials: calcium silicate hydrate and calcium aluminoferrite

Abstract: Ion conductivity of C-S-H and photocatalytic activity of C4AF for the stability of concrete structures and the functionality of concrete surfaces.

Cited by 14 publications

References 49 publications

Reuse of steel slag as a photocatalyst for tetracycline degradation: mechanism of oxygen vacancies

Reuse of steel slag as a photocatalyst for tetracycline degradation: mechanism of oxygen vacancies

Construction Building Materials as a Potential for Structural Supercapacitor Applications

Novel Accelerated Test Method for RH Dependency of Steel Corrosion in Carbonated Mortar

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