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Titolo:
Microscopic analysis of 50% axially strained cementitious materials
Autore:
Song, HW; Kim, JHJ; Choi, JH; Byun, KJ;
Indirizzi:
Yonsei Univ, Dept Civil Engn, Seoul 120749, South Korea Yonsei Univ Seoul South Korea 120749 vil Engn, Seoul 120749, South Korea Sejong Univ, Dept Civil & Environm Engn, Seoul 4600364, South Korea SejongUniv Seoul South Korea 4600364 m Engn, Seoul 4600364, South Korea
Titolo Testata:
CEMENT AND CONCRETE RESEARCH
fascicolo: 8, volume: 31, anno: 2001,
pagine: 1191 - 1202
SICI:
0008-8846(200108)31:8<1191:MAO5AS>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONCRETE;
Keywords:
confined cementitious materials; tube-squash test; microscopic behavior; hydration; microstructure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Song, HW Yonsei Univ, Dept Civil Engn, Shinchon Dong 134, Seoul 120749, South Korea Yonsei Univ Shinchon Dong 134 Seoul South Korea 120749 uth Korea
Citazione:
H.W. Song et al., "Microscopic analysis of 50% axially strained cementitious materials", CEM CONCR R, 31(8), 2001, pp. 1191-1202

Abstract

The microscopic behavior of 50% axially strained cementitious materials isstudied. The microscopic behavior of concrete under the triaxial stress condition must be fully understood to explain the additional concrete ductility that comes from lateral confinement and a microstructural mechanism which has been subjected to extreme strain. The so-called "tube-squash" test was used to achieve 50% axial strain and over 70 degrees of shear angle change in a concrete under extremely high pressure, without visible cracks. Then, microscopic analysis focusing on hydration and the microstructure of a 50% axially strained cement paste were performed on cored-out deformed and virgin (undeformed) cement paste specimens; the first specimen was 40 days old and the second one was 1 year old, Field emission scanning electronic microscope (FESEM) analysis was performed to compare the microstructures of the 40-day-old and 1-year-old specimens applied with finite strain. On the 1-year-old specimens, X-ray diffractometer (XRD), energy dispersive X-ray spectrometer (EDS), and differential thermal analysis/thermo-gravity (DTA/TG) analyses were also performed to study the change of hydration and microstructures due to 50% axial strain. The results and implications from these various analyses are discussed. (C), 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/10/20 alle ore 02:32:53