J 2007

ETTRINGITE AND THAUMASITE FORMATION CONDITIONS IN CONCRETE STRUCTURES

GREGEROVÁ, Miroslava

Basic information

Original name

ETTRINGITE AND THAUMASITE FORMATION CONDITIONS IN CONCRETE STRUCTURES

Name in Czech

Podmínky vzniku ettringitu a thaumasitu v betonových konstrukcích

Authors

GREGEROVÁ, Miroslava ORCID (203 Czech Republic, guarantor)

Edition

Acta Geologica Universitatis Comenianae, Bratislava, Universita Comenianae, 2007, 1335-2830

Other information

Language

English

Type of outcome

Article in a journal

Field of Study

10500 1.5. Earth and related environmental sciences

Country of publisher

Czech Republic

Confidentiality degree

is not subject to a state or trade secret

RIV identification code

RIV/00216224:14310/07:00024839

Organization unit

Faculty of Science

Keywords in English

Thaumasite;ettringite;concrete; degradation;petrography;aggregate
Changed: 24/7/2008 08:55, doc. RNDr. Miroslava Gregerová, CSc.

Abstract

V originále

The significance of specific analytical study of cementitious materials (matrix and filling material) becomes very interesting and important during several last years. This study is focused on mineral composition of matrix in concrete, and in particular on petrographic character of aggregates. Aggregates of these samples can be divided into different groups, which mean that aggregates were formed in different geological environments or they were artificially prepared. In several samples was verified that ASR reaction precedes sulphate reaction. Because phthanites (Paleozoic silica rock) and porcelanites were observed in aggregates it had to be verified formation of ASR reaction products. Results were obtained from study of highway concrete, colcrete, expanded-clay concrete and reinforced concrete from a historical bridge structure. In samples of highway and reinforced concrete thaumasite and ettringite were observed, while in lightweight concrete only ettringite occurred. On several occasions the effect of biocorrosion in sulphate formation in concrete could also be proved.

Links

GA103/00/0607, research and development project
Name: Transport solí pórovou strukturou betonu a podmínky vzniku eflorescentů na jeho povrchu
Investor: Czech Science Foundation, Salt transport in the porous structure of concrete and conditions of efflorescence formation on its surface
GA103/02/0990, research and development project
Name: Výzkum vlivu nesilových účinků a agresivního prostředí na stárnutí historických staveb se zvláštním zaměřením na Karlův most v Praze
Investor: Czech Science Foundation, Research into non-force effects and aggressive environment affecting the ageing of historical structures with special emphasis on Charles bridge in Prague