Relationships Between Transformation of Cement Hydrates and Meso-scale Mechanical Characteristics of Mortar Deteriorated by Sulfate Attack
硫酸劣化したモルタルのセメント水和組織の変質と準微視的力学的性質との関係
In this study, meso-scale thin mortar specimens were immersed in a sulfuric acid solution for 60 days and then subjected to three-point bending tests and shear tests to clarify the mechanical behaviors of mortar in containing cement hydrates transubstantiated under sulfate attack. In particular, tensile behaviors, namely elastic modulus, tensile strength and fracture energy, and shear strength, were determined from the load-displacement curves using back analysis and shear tests, respectively. Following the mechanical tests, chemical analyses were also carried out to clarify how the amount of hydrates, which were quantities of CH and C-S-H, the existence of precipitates, porosity and pore volume distribution affect mechanical characteristics. As a result, it was found that the relationships between physico-chemical properties and elastic modulus and tensile strength differ from the relationships between physico-chemical properties and fracture energy and shear strength. Furthermore, the applicability of the proposed model based on the relationships between porosity and strength was verified through comparison of the calculated and experimental results.硫酸溶液を用いたモルタルの薄片供試体による最大60日間における浸漬実験を行った。その目的は，浸漬後に曲げ試験およびせん断試験を行うことで，硫酸劣化によりセメント水和組織が変質した薄片供試体における力学的性質の挙動を抽出することにある。本研究において，曲げ試験から得られる荷重変位曲線から逆解析により引張特性（弾性係数，引張強度，破壊エネルギー，引張軟化曲線）を同定し，同一試験体を用いてせん断試験を行うことでせん断強度を測定した。加えて，物理的性質として力学試験後の薄片供試体の水和物量（CH，C-S-H），析出物，空隙率，細孔径分布を測定することで，物理的性質と力学的性質の変化を関連付けた。最終的に，硫酸劣化による物理的性質の変化が力学的性質に及ぼす影響は，弾性係数と引張強度および破壊エネルギーとせん断強度とで異なることを明らかにした。さらに，空隙と強度の関係に基づく既往の提案モデルの適用性を評価した。
- Record URL:
- Summary URL:
-
Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/13404733
-
Authors:
- Miura, Taito
- Sato, Yasuhiko
- Nakamura, Hikaru
- Publication Date: 2015
Language
- English
- Japanese
Media Info
- Media Type: Digital/other
- Features: Figures; Photos; References; Tables;
- Pagination: pp 1-9
-
Serial:
- Concrete Research and Technology
- Volume: 26
- Issue Number: 0
- Publisher: Japan Concrete Institute
- ISSN: 1340-4733
- EISSN: 2186-2745
- Serial URL: https://www.jstage.jst.go.jp/browse/crt/-char/en
-
Publication flags:
Open Access (libre)
Subject/Index Terms
- TRT Terms: Bending; Cement; Hydrates; Mortar; Porosity; Shear strength; Shear tests; Sulfates
- Subject Areas: Highways; Materials; Pavements; I32: Concrete; I52: Construction of Pavements and Surfacings;
Filing Info
- Accession Number: 01564601
- Record Type: Publication
- Source Agency: Japan Science and Technology Agency (JST)
- Files: TRIS, JSTAGE
- Created Date: May 26 2015 4:12PM