Structural Changes of C-S-H Phase During Leaching Alteration

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  • Yamamoto Takeshi
    （財）電力中央研究所 地球工学研究所 バックエンド研究センター
  • Hironaga Michihiko
    （財）電力中央研究所 地球工学研究所 バックエンド研究センター

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Other Title
  • 溶脱変質に伴うＣ‐Ｓ‐Ｈ相の構造変化
  • 溶脱変質に伴うC-S-H相の構造変化
  • ヨウ ダツヘンシツ ニ トモナウ C S Hソウ ノ コウゾウ ヘンカ

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Description

During leaching alteration of hardened cementitious materials, Ca/Si ratio of C-S-H phase will decrease following the disappearance of calcium hydroxide (CH). Though the progression rate of CH alteration front and decreasing rate of Ca/Si ratio in C-S-H phase depend on the type of cementitious material, chain structure of Si tetrahedron in C-S-H phase will extend with increasing Q2/Q1 signal ratio in 29Si-NMR analysis, regardless of the type of cement. When the leaching alteration of C-S-H progressed further to 1.0 in Ca/Si ratio, Q3 signal which indicates the status of three-directional bonding of the Si tetrahedron with other Si had generated. Granular substance with 10 to 30 nm diameter which was thought to be the unit of C-S-H phase would shrink during the leaching alteration with forming minor pore in C-S-H phase.

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