Study on Specific Surface Area of Hydration Products in Hardened Cement Paste

Suda, Yuya; Tsuchida, Shiori; Saeki, Tatsuhiko

doi:10.14250/cement.65.103

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…Therefore, we measured not only hardened cement paste but also synthesized hydrates to confirm the validity of the physical properties in this study. C-S-H gel (C/S = 1.7), C-A-H gel (C/A = 1.0), AH 3 gel, ettringite, and monosulfate were synthesized by referring to the literature (Nakamura et al 1999;Sato 1989;Morioka 2000;Suda et al 2011). Ca(OH) 2 (CH) was a special-grade reagent.…”

Section: Measuring the Hardness Of The Hydratesmentioning

confidence: 99%

Examination of Strength Model for the Cementitious Material Containing Aluminous Cement

Mori

Itoh

Takahashi

et al. 2016

ACT

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This study examined the compressive strength model for cementitious material based on the Portland cement -aluminous cement-anhydrite system, which considers the physical properties of the hydrate and phase composition. The volume fraction of each hydrate and the hardness of the synthesized hydrate measured by nanoindentation were used to determine the calculation formula of σ 0 of the Ryshkewitch model. The formula for calculating the k value using the volume fraction of each hydrate was also suggested. In the range of this study, the difference in the compressive strength of this system could be arranged by the Ryshkewitch model using the σ 0 and the k values calculated by the suggested calculation formulas.

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Section: Measuring the Hardness Of The Hydratesmentioning

confidence: 99%

Examination of Strength Model for the Cementitious Material Containing Aluminous Cement

Mori

Itoh

Takahashi

et al. 2016

ACT

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“…The structure of the Ms and the physical properties of the C-S-H, such as density and specific surface area, also change with the drying conditions (Baquerizo et al 2014;Suda et al 2011). Therefore, it is possible that the secondary ettringite formation is affected by both the drying conditions and the physical properties of the hydration products.…”

Section: Introductionmentioning

confidence: 99%

Effects of Pre-Drying and Coexisting Materials on Secondary Ettringite Formation

Sato

Saito

Shinagawa

et al. 2018

ACT

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The expansion of cement paste can occur as a result of secondary ettringite formation due to attack by sulfates. It has been proposed that this expansion is affected by coexisting hydration products such as calcium-silicate-hydrates (C-S-H), although the mechanism has not yet been clarified. Drying conditions may also influence secondary ettringite formation because the structure of the monosulfate is changed. The present study experimentally examined the effects of monosulfate pre-drying conditions and coexisting materials on secondary ettringite formation. Synthesized monosulfate samples dried under varying conditions and with coexisting materials such as C-S-H were mixed with a sodium sulfate solution, and the amount of secondary ettringite was found to increase following drying under 0% or 11% relative humidity. The secondary ettringite proportion was also markedly increased by the presence of C-S-H, regardless of the pre-drying conditions, and calcium-aluminate-silicate-hydrates (C-A-S-H) containing four-coordinate Al were formed in these samples. It is evident that ettringite is likely to form from four-coordinate Al, and that C-S-H promotes secondary ettringite formation because it transitions six-coordinate Al derived from the monosulfate to four-coordinate Al by substituting Al in the Si chains.

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Surface area development of Portland cement paste during hydration: Direct comparison with 1H NMR relaxometry and water vapor/nitrogen sorption

Kurihara

Maruyama

2022

Cement and Concrete Research

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Study on Specific Surface Area of Hydration Products in Hardened Cement Paste

Cited by 5 publications

References 2 publications

Examination of Strength Model for the Cementitious Material Containing Aluminous Cement

Examination of Strength Model for the Cementitious Material Containing Aluminous Cement

Effects of Pre-Drying and Coexisting Materials on Secondary Ettringite Formation

Surface area development of Portland cement paste during hydration: Direct comparison with 1H NMR relaxometry and water vapor/nitrogen sorption

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