Kinetics of processes modeling corrosion of glass fibers mixed into concrete

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46356088%3A_____%2F17%3AN0000029" target="_blank" >RIV/46356088:_____/17:N0000029 - isvavai.cz</a>

Alternative codes found

RIV/60461373:22310/17:43913967

Result on the web

<a href="http://dx.doi.org/10.13168/cs.2017.0012" target="_blank" >http://dx.doi.org/10.13168/cs.2017.0012</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.13168/cs.2017.0012" target="_blank" >10.13168/cs.2017.0012</a>

Result language

angličtina

Original language name

Kinetics of processes modeling corrosion of glass fibers mixed into concrete

Original language description

The presented work involved model corrosion tests of silicazirconia glass fibers with two different types of lubrication (Anti-Crack HD with dispersible lubrication and Anti-Crack HP with non-dispersible lubrication). Also the corrosion tests of fibers with lubrication removed by firing was studied. All types of fibers were leached in alkaline solutions (Ca(OH)2 with pH 12.7, KOH with pH 12.7 and 14) at temperature of 80°C for 7 - 42 days. Changes in corrosion solutions composition and in glass surface were measured and characterized (AAS, ICP-OES and SEM-EDS, XRF, XRD resp.). The leaching results were similar for both types of fibers with or without lubrication. After leaching in the Ca(OH) 2 (pH 12.7), the fibers were covered with calcium precipitates. On fibers with lubrication the precipitate contained mainly crystalline calcium carbonate and calcium hydroxide, while on fibers with removed lubrication the precipitate also contained silicate. After the calciumcontaining precipitates were removed with an acid solution, pitting corrosion was visible on fibers with lubrication while fibers without lubrication were covered with a corrosion layer without a significant change in the surface composition. The fibers practically did not dissolve in that environment. In KOH (pH 12.7) the fibers slightly dissolved but without visible precipitates, the composition of all types of fibers did not substantially changed In KOH (pH 14) the fibers dissolved more significantly. On the surface of the fibers a ZrO2 and silica containing corrosion layer was formed. The time dependences of dissolved glass components indicates the incongruent dissolution of the fibers with selective leaching of sodium ions or congruent dissolution followed by precipitation of SiO2, or SiO2 with calcium ions from the solution. It is likely that both the created precipitates (calcium or calcium-silica) and the developed corrosion layers (silica - zirconia) may operate as a barrier which slows down further corrosion of glass fibers.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

—

OECD FORD branch

20401 - Chemical engineering (plants, products)

Project

<a href="/en/project/GA14-20856S" target="_blank" >GA14-20856S: The kinetics of corrosion processes and corrosion media transport in advanced ultra-high performance concretes (UHPC)</a><br>

Continuities

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Ceramics - Silikaty

ISSN

0862-5468

e-ISSN

—

Volume of the periodical

61

Issue of the periodical within the volume

2

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

9

Pages from-to

163-171

UT code for WoS article

—

EID of the result in the Scopus database

2-s2.0-85018514791