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Journal Articles

Emulsification of low viscosity oil in alkali-activated materials

Reeb, C.*; Davy, C. A.*; Pierlot, C.*; Bertin, M.*; Cantarel, V.; Lambertin, D.*

Cement and Concrete Research, 162, p.106963_1 - 106963_16, 2022/12

 Times Cited Count:8 Percentile:61.14(Construction & Building Technology)

Journal Articles

Effect of magnesium silicate hydrate (M-S-H) formation on the local atomic arrangements and mechanical properties of calcium silicate hydrate (C-S-H); In situ X-ray scattering study

Kim, G.*; Im, S.*; Jee, H.*; Suh, H.*; Cho, S.*; Kanematsu, Manabu*; Morooka, Satoshi; Koyama, Taku*; Nishio, Yuhei*; Machida, Akihiko*; et al.

Cement and Concrete Research, 159, p.106869_1 - 106869_17, 2022/09

 Times Cited Count:22 Percentile:89.36(Construction & Building Technology)

Journal Articles

Solidification and stabilization of strontium and chloride ions in thermally treated calcium aluminate cement modified with or without sodium polyphosphate

Irisawa, Keita; Namiki, Masahiro*; Taniguchi, Takumi; Garcia-Lodeiro, I.*; Kinoshita, Hajime*

Cement and Concrete Research, 156, p.106758_1 - 106758_8, 2022/06

 Times Cited Count:8 Percentile:56.17(Construction & Building Technology)

Cementation of aqueous radioactive waste contaminated with a significant $$^{90}$$Sr is challenging, and utilization of calcium aluminate cement (CAC) modified with sodium polyphosphate (CAP) is interesting. The present study investigated solidification and stabilization of Sr$$^{2+}$$ and Cl$$^{-}$$ ions in CAC and CAP cured in open system at 90$$^{circ}$$C and in closed system at 20$$^{circ}$$C. A leaching test showed that Sr$$^{2+}$$ ion could be stabilized more effectively in the CAP than in the CAC. On the other hand, the CAC cured at 20$$^{circ}$$C had the best stabilization for Cl$$^{-}$$ ion among the samples. Friedel's salt formed in the CAC may have contributed to the immobilization of Cl$$^{-}$$ ion. Although the stabilization of Cl$$^{-}$$ ion by CAP was less effective than CAC, it was significantly improved by the thermal treatment. The results may suggest that Cl$$^{-}$$ ion in the CAP was incorporated in the poorly crystalline apatite structure.

Journal Articles

Water permeability of geopolymers emulsified with oil

Planel, B.*; Davy, C. A.*; Adler, P. M.*; Hauss, G.*; Bertin, M.*; Cantarel, V.; Lambertin, D.*

Cement and Concrete Research, 135, p.106108_1 - 106108_14, 2020/09

 Times Cited Count:11 Percentile:45.63(Construction & Building Technology)

Journal Articles

Influence of mixing solution on characteristics of calcium aluminate cement modified with sodium polyphosphate

Irisawa, Keita; Garcia-Lodeiro, I.*; Kinoshita, Hajime*

Cement and Concrete Research, 128, p.105951_1 - 105951_7, 2020/02

 Times Cited Count:10 Percentile:38.71(Construction & Building Technology)

This study investigated characteristics of a calcium aluminate cement modified with a phosphate (CAP) by changing an amount and concentration of mixing solution with sodium polyphosphate. When the amount of mixing solution was increased with a constant amount of sodium polyphosphate, an enhanced consumption of monocalcium aluminate was observed compared with gehlenite in calcium aluminate cement (CAC). Formation of gibbsite, Al(OH)$$_{3}$$, was also increased as a hydration product in the CAP and the possible reduction of water in the amorphous gel phase. When the amount of mixing solution was increased with a constant concentration of sodium polyphosphate, the enhanced consumption of monocalcium aluminate was not observed. Neither gibbsite nor any other crystalline hydration products were identified in this series. In addition, unreacted sodium polyphosphate remained in the system. The increased formation of gibbsite and the possible reduction of water from the amorphous gel phase appears to contribute to the improvement of the microstructure in the products.

Journal Articles

Reduction of water content in calcium aluminate cement with/out phosphate modification for alternative cementation technique

Garcia-Lodeiro, I.*; Irisawa, Keita; Jin, F.*; Meguro, Yoshihiro; Kinoshita, Hajime*

Cement and Concrete Research, 109, p.243 - 253, 2018/07

 Times Cited Count:29 Percentile:68.41(Construction & Building Technology)

Journal Articles

Calcium silicate hydrate (C-S-H) gel solubility data and a discrete solid phase model at 25$$^{circ}$$C based on two binary non-ideal solid solutions

Walker, C.; Suto, Shunkichi; Oda, Chie; Mihara, Morihiro; Honda, Akira

Cement and Concrete Research, 79, p.1 - 30, 2016/01

 Times Cited Count:78 Percentile:90.93(Construction & Building Technology)

Modeling the solubility behavior of calcium silicate hydrate (C-S-H) gel is important to make quantitative predictions of the degradation of hydrated ordinary Portland cement (OPC) based materials. Experimental C-S-H gel solubility data have been compiled from the literature, critically evaluated and supplemented with new data from the current study for molar Ca/Si ratios = 0.2-0.83. All these data have been used to derive a discrete solid phase (DSP) type C-S-H gel solubility model based on two binary non-ideal solid solutions in aqueous solution(SSAS). Features of the DSP type C-S-H gel solubility model include satisfactory predictions of pH values and Ca and Si concentrations for all molar Ca/Si ratios = 2.7 $$rightarrow$$ 0 in the C-S-H system, portlandite (CH) for Ca/Si ratios $$>$$ 1.65, congruent dissolution at Ca/Si ratios = 0.85, and amorphous silica (SiO$$_{2 (rm am)}$$) for Ca/Si ratios $$<$$ 0.55 as identified in the current study by IR spectroscopy.

Journal Articles

Modeling of diffusive mass transport in micropores in cement based materials

Yamaguchi, Tetsuji; Negishi, Kumi*; Hoshino, Seiichi; Tanaka, Tadao

Cement and Concrete Research, 39(12), p.1149 - 1155, 2009/12

 Times Cited Count:29 Percentile:64.22(Construction & Building Technology)

In order to predict long-term leaching behavior of cement constituents in safety assessments of radioactive waste disposal, we modeled diffusive mass transport in micropores cement based materials. Based on available knowledge on the pore structure, we developed a transport porosity model that enables us to estimate effective porosity available for diffusion (transport porosity) in cement based materials. We microscopically examined the pore structure of hardened cement pastes to partially verify the model. Effective diffusivities of tritiated water in hardened cement pastes were also obtained experimentally, and were shown to be proportional to the estimated transport porosity. We successfully modeled the effective diffusivity in cement based materials consistent with previously acknowledged pore diffusion model.

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