Carbonation Reaction of Calcium Silicate Hydrates by Hydrothermal Synthesis at 150°C in OPC-γ-Ca&lt;sub&gt;2&lt;/sub&gt;SiO&lt;sub&gt;4&lt;/sub&gt;-α-Quartz Systems

Saito, Tsuyoshi; Sakai, Etsuo; Morioka, Minoru; Daimon, Masaki

doi:10.3151/jact.5.333

Cited by 14 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e gaps between porosity of noncarbonated and carbonated samples were more obvious as the replacement ratio increases. Vaterite formed by the carbonation of c-C 2 S is denser than calcite and aragonite (vaterite: 2.645 g/cm 3 , calcite: 2.711 g/cm 3 , and aragonite: 2.944 g/cm 3 ) [42].…”

Section: Tga Analysismentioning

confidence: 96%

Improvement in Carbonation Resistance of Portland Cement Mortar Incorporating γ-Dicalcium Silicate

Chen

Lee

Cho

et al. 2019

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

In this study, γ-dicalcium silicate (γ-C2S) was incorporated into ordinary Portland cement (OPC) to sequester CO2 to enhance the carbonation resistance of cement-based composite materials. γ-C2S can react with CO2 rapidly to form vaterite and high dense SiO2 gel which could block the pores off and then inhibit further diffusion of CO2 into the system. Cement mortar specimens containing 0%, 5%, 10%, 20%, and 40% γ-C2S as cement replacement were prepared. After water curing for 28 days followed by curing in an environmental chamber for 28 days, the specimens were then exposed to an accelerated carbonation with 5% CO2 concentration for 28 days. The carbonation depth of the cement mortar with a low replacement rate (5% and 10%) was lower than that of the OPC mortar at all ages due to the sequestration of CO2 by γ-C2S. However, the cement mortar with a high replacement rate (20% and 40%) showed less carbonation resistance due to the dilution effect of γ-C2S replacement and increase in initial porosity caused by nonhydraulic characteristic of γ-C2S.

show abstract

Section: Tga Analysismentioning

confidence: 96%

Improvement in Carbonation Resistance of Portland Cement Mortar Incorporating γ-Dicalcium Silicate

Chen

Lee

Cho

et al. 2019

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

show abstract

“…5) Moreover, Saito further reported that, the residual γ -C2S after autoclave curing reacts with CO2 during accelerated carbonation curing in OPC-γ -C2S-α -Quartz systems. 6) This material design for high durability of cementitious materials containing γ -C2S presented by Saito 6) and Yumoto 7) is shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

“…The autoclave curing process formulated the generation of large amount of 1.1nm tobermorite in the hardened cement matrix. 8) And then, accelerated carbonation curing formed the vaterite at the surface of specimen leading to the surface densification. The densification of the surface prevented the penetration of chloride ions.…”

Section: Introductionmentioning

confidence: 99%

Corrosion of Steel Bars in Autoclaved Concrete Pile Containing γ-2CaO·SiO2 with an Accelerated Carbonation Curing Submerged in the Real Marine Environment

Saphouvong

Saito

Otsuki

et al. 2012

J. Soc. Mat. Sci., Japan

Self Cite

View full text Add to dashboard Cite

This paper presents a set of the investigation of corrosion of steel bars in autoclaved concrete pile containing γ -2CaO ·SiO2 (γ -C2S) with carbonation curing. OPC, γ -C2S, and fine silica powder were used as the binders; the replacement ratio of OPC by γ -C2S was 0%, 40%, and 80% by mass. Autoclaved concrete pile after carbonation was submerged in real marine environment at Kurihama Bay for two years. After immersion, visual observation of steel bars was conducted to confirm the corrosion state of steel inside the concrete pile. Furthermore, to evaluate the corrosion of steel bars -weight loss, corrosion current density, and anodic polarization curve were measured ; various corrosion substances also were measured to evaluate the permeability of corrosion factors. In addition, cement past sample with same mixed proportion and curing condition was made for explaining the permeable characteristics of corrosion substances. As the results, the steel bars in the 80% γ -C2S replacement ratio did not corrode while steel bars in the other mixed proportions had corroded. The weight loss of steel bar in the 80% γ -C2S replacement ratio after carbonation reduced by 39% and corrosion current density reduced more than 95% compared with the 0% γ -C2S replacement ratio. Furthermore, the corrosion substances in concrete pile -carbonation depth, total chloride ion content, and oxygen diffusion rate, reduced significantly at the 80% replacement ratio of γ -C2S. Based on the overall results of this study, we suggest that, when using γ -C2S with an autoclave curing, accelerated carbonation curing is able to do to densify the concrete surface preventing the steel from corrosion for the long-term exposure.Key words : γ-2CaO ·SiO2

show abstract

Carbonation characteristics of γ-dicalcium silicate for low-carbon building material

Liu

Wang

et al. 2018

Construction and Building Materials

132

View full text Add to dashboard Cite

Carbonation Reaction of Calcium Silicate Hydrates by Hydrothermal Synthesis at 150°C in OPC-γ-Ca<sub>2</sub>SiO<sub>4</sub>-α-Quartz Systems

Cited by 14 publications

References 4 publications

Improvement in Carbonation Resistance of Portland Cement Mortar Incorporating γ-Dicalcium Silicate

Improvement in Carbonation Resistance of Portland Cement Mortar Incorporating γ-Dicalcium Silicate

Corrosion of Steel Bars in Autoclaved Concrete Pile Containing γ-2CaO·SiO2 with an Accelerated Carbonation Curing Submerged in the Real Marine Environment

Carbonation characteristics of γ-dicalcium silicate for low-carbon building material

Contact Info

Product

Resources

About