Microstructural changes in white Portland cement paste under the first drying process evaluated by WAXS, SAXS, and USAXS

Ippei Maruyama; Naoki Sakamoto; Kunio Matsui; Go Igarashi

doi:10.1016/j.cemconres.2016.10.002

Microstructural changes in white Portland cement paste under the first drying process evaluated by WAXS, SAXS, and USAXS

Ippei Maruyama, Naoki Sakamoto, Kunio Matsui, Go Igarashi

ENG - Architecture and Building Science

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

Meso- and micro-scale structural changes in matured hardened cement paste dried slowly for 1.5 years at different relative humidities (RHs) are evaluated by small-angle X-ray scattering profiles covering a q range of 0.017 nm^{− 1}–30 nm^{− 1} with a fractal disc-shaped particle analysis and Guinier approximation. The fractal disc-shaped particle analysis revealed that calcium–silicate–hydrate (C–S–H) agglomerations are very thin (~ 2.5 nm) and of relatively large width (~ 35 nm) under high RH conditions. However, the agglomerations are segmented (in width) into ~ 10 nm below an RH of 40%. The Guinier approximation found the possibility that the scattering profiles in the range of 2 nm^{− 1}–8 nm^{− 1} correspond to a spacing between C–S–H monolayers and it showed stepwise changes at 40%–50% RH. The stepwise behavior of the distance between C–S–H monolayers may explain a kink in water vapor desorption at around 40% RH.

Original language	English
Pages (from-to)	24-32
Number of pages	9
Journal	Cement and Concrete Research
Volume	91
DOIs	https://doi.org/10.1016/j.cemconres.2016.10.002
Publication status	Published - 2017 Jan 1

Keywords

Adsorption (C)
Calcium–silicate–hydrate (C–S–H) (B)
Drying (A)
Microstructure (B)
Small-angle X-ray scattering (B)

ASJC Scopus subject areas

Building and Construction
Materials Science(all)

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@article{a38bfac626dd4a8291e63defe52335dc,

title = "Microstructural changes in white Portland cement paste under the first drying process evaluated by WAXS, SAXS, and USAXS",

abstract = "Meso- and micro-scale structural changes in matured hardened cement paste dried slowly for 1.5 years at different relative humidities (RHs) are evaluated by small-angle X-ray scattering profiles covering a q range of 0.017 nm− 1–30 nm− 1 with a fractal disc-shaped particle analysis and Guinier approximation. The fractal disc-shaped particle analysis revealed that calcium–silicate–hydrate (C–S–H) agglomerations are very thin (~ 2.5 nm) and of relatively large width (~ 35 nm) under high RH conditions. However, the agglomerations are segmented (in width) into ~ 10 nm below an RH of 40%. The Guinier approximation found the possibility that the scattering profiles in the range of 2 nm− 1–8 nm− 1 correspond to a spacing between C–S–H monolayers and it showed stepwise changes at 40%–50% RH. The stepwise behavior of the distance between C–S–H monolayers may explain a kink in water vapor desorption at around 40% RH.",

keywords = "Adsorption (C), Calcium–silicate–hydrate (C–S–H) (B), Drying (A), Microstructure (B), Small-angle X-ray scattering (B)",

author = "Ippei Maruyama and Naoki Sakamoto and Kunio Matsui and Go Igarashi",

note = "Funding Information: Some parts of this study have been carried out as a part of the Japanese Nuclear Regulation Authority NRA project for advanced aging management technical evaluation of concrete structures in nuclear power plants and JSPS KAKENHI project (Grant Number 15H04077 ). The measurements of the water vapor sorption isotherms were conducted by Mr. Daichi Hashimoto (Master course student, Nagoya University) to whom the authors would like to express their gratitude. The USAXS, SAXS and WAXS measurements were carried out at SPring-8 BL08B2 with the proposal number 2013B3306, 2014A3306 and 2014B3306. ",

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doi = "10.1016/j.cemconres.2016.10.002",

language = "English",

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journal = "Cement and Concrete Research",

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T1 - Microstructural changes in white Portland cement paste under the first drying process evaluated by WAXS, SAXS, and USAXS

AU - Maruyama, Ippei

AU - Sakamoto, Naoki

AU - Matsui, Kunio

AU - Igarashi, Go

N1 - Funding Information: Some parts of this study have been carried out as a part of the Japanese Nuclear Regulation Authority NRA project for advanced aging management technical evaluation of concrete structures in nuclear power plants and JSPS KAKENHI project (Grant Number 15H04077 ). The measurements of the water vapor sorption isotherms were conducted by Mr. Daichi Hashimoto (Master course student, Nagoya University) to whom the authors would like to express their gratitude. The USAXS, SAXS and WAXS measurements were carried out at SPring-8 BL08B2 with the proposal number 2013B3306, 2014A3306 and 2014B3306.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Meso- and micro-scale structural changes in matured hardened cement paste dried slowly for 1.5 years at different relative humidities (RHs) are evaluated by small-angle X-ray scattering profiles covering a q range of 0.017 nm− 1–30 nm− 1 with a fractal disc-shaped particle analysis and Guinier approximation. The fractal disc-shaped particle analysis revealed that calcium–silicate–hydrate (C–S–H) agglomerations are very thin (~ 2.5 nm) and of relatively large width (~ 35 nm) under high RH conditions. However, the agglomerations are segmented (in width) into ~ 10 nm below an RH of 40%. The Guinier approximation found the possibility that the scattering profiles in the range of 2 nm− 1–8 nm− 1 correspond to a spacing between C–S–H monolayers and it showed stepwise changes at 40%–50% RH. The stepwise behavior of the distance between C–S–H monolayers may explain a kink in water vapor desorption at around 40% RH.

AB - Meso- and micro-scale structural changes in matured hardened cement paste dried slowly for 1.5 years at different relative humidities (RHs) are evaluated by small-angle X-ray scattering profiles covering a q range of 0.017 nm− 1–30 nm− 1 with a fractal disc-shaped particle analysis and Guinier approximation. The fractal disc-shaped particle analysis revealed that calcium–silicate–hydrate (C–S–H) agglomerations are very thin (~ 2.5 nm) and of relatively large width (~ 35 nm) under high RH conditions. However, the agglomerations are segmented (in width) into ~ 10 nm below an RH of 40%. The Guinier approximation found the possibility that the scattering profiles in the range of 2 nm− 1–8 nm− 1 correspond to a spacing between C–S–H monolayers and it showed stepwise changes at 40%–50% RH. The stepwise behavior of the distance between C–S–H monolayers may explain a kink in water vapor desorption at around 40% RH.

KW - Adsorption (C)

KW - Calcium–silicate–hydrate (C–S–H) (B)

KW - Drying (A)

KW - Microstructure (B)

KW - Small-angle X-ray scattering (B)

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