Your browser does not allow JavaScript!
JavaScript is necessary for the proper functioning of this website. Please enable JavaScript or use a modern browser.
|
|
SLO
|
ENG
|
Cookies and privacy
DKUM
EPF - Faculty of Business and Economics
FE - Faculty of Energy Technology
FERI - Faculty of Electrical Engineering and Computer Science
FF - Faculty of Arts
FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
FKBV - Faculty of Agriculture and Life Sciences
FKKT - Faculty of Chemistry and Chemical Engineering
FL - Faculty of Logistic
FNM - Faculty of Natural Sciences and Mathematics
FOV - Faculty of Organizational Sciences in Kranj
FS - Faculty of Mechanical Engineering
FT - Faculty of Tourism
FVV - Faculty of Criminal Justice and Security
FZV - Faculty of Health Sciences
MF - Faculty of Medicine
PEF - Faculty of Education
PF - Faculty of Law
UKM - University of Maribor Library
UM - University of Maribor
UZUM - University of Maribor Press
COBISS
Faculty of Business and Economic, Maribor
Faculty of Agriculture and Life Sciences, Maribor
Faculty of Logistics, Celje, Krško
Faculty of Organizational Sciences, Kranj
Faculty of Criminal Justice and Security, Ljubljana
Faculty of Health Sciences
Library of Technical Faculties, Maribor
Faculty of Medicine, Maribor
Miklošič Library FPNM, Maribor
Faculty of Law, Maribor
University of Maribor Library
Bigger font
|
Smaller font
Introduction
Search
Browsing
Upload document
For students
For employees
Statistics
Login
First page
>
Show document
Show document
Title:
Utrjanje betona z zakasnelo tvorbo etringita
Authors:
ID
Lubej, Samo
(Author)
ID
Anžel, Ivan
(Mentor)
More about this mentor...
ID
Kosec, Ladislav
(Comentor)
Files:
DR_Lubej_Samo_2012.pdf
(26,01 MB)
MD5: B51D36653A5D1CC225411AD0450493FE
PID:
20.500.12556/dkum/2f0c3dac-d23d-47b2-8a03-29757ebb8295
Language:
Slovenian
Work type:
Dissertation
Organization:
FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
Abstract:
Zakasnela tvorba etringita (Delayed Ettringite Formation - DEF) je kemična reakcija z dokazano škodljivim vplivom na hidratizirani beton. Kristali ki pri tej kemični reakciji nastanejo lahko povzročijo nastanek razpok. Pozitivne spremembe prostornine, ki je posledica nastalih produktov prav tako poveča pritiske na stene razpok in poroznih mestih. Zaradi rasti kristalov etringita ima lahko mlad hidratizirani beton višje trdnosti, kar pa navadno pomeni spremljajoč pojav nastanek razpok in razpad betona. V disertaciji smo raziskali možnosti kako izkoristiti pozitivne volumensko spremembo, ki je posledica DEF za izboljšanje trdnostnih lastnosti drobno zrnatega betona.. Ugotovili smo, da z dodajanjem aeranta in zelo kratkim časom vibriranja betona dosežemo takšno strukturo betona, kjer zračni mehurčki v hidratiziranem betonu predstavljajo nukleacijska mesta. Zakasnela tvorba etringita je z razpršenimi zračnimi mehurčki, ki so nastali od aeranta kontrolirana. Rast kristalov etringita ne povzroči hitrega povečanja trdnosti in razapada betona temveč v fazi stabilizacije strukture doprinese 6% povečanje tlačne trdnosti ob minimalnem znižanju gostote hidratiziranega drobno zrnatega betona.
Keywords:
Zakasnela tvorba etringita (DEF)
,
kontrolirana DEF
,
kristali etringita
,
aerirani beton
,
utrjanje
Place of publishing:
Maribor
Publisher:
[S. Lubej]
Year of publishing:
2011
PID:
20.500.12556/DKUM-22543
UDC:
691.332.5:666.972(043.3)
COBISS.SI-ID:
15902742
NUK URN:
URN:SI:UM:DK:SBNXQZTE
Publication date in DKUM:
11.04.2012
Views:
3568
Downloads:
318
Metadata:
Categories:
KTFMB - FG
Cite this work
Plain text
BibTeX
EndNote XML
EndNote/Refer
RIS
ABNT
ACM Ref
AMA
APA
Chicago 17th Author-Date
Harvard
IEEE
ISO 690
MLA
Vancouver
:
LUBEJ, Samo, 2011,
Utrjanje betona z zakasnelo tvorbo etringita
[online]. Doctoral dissertation. Maribor : S. Lubej. [Accessed 22 January 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=22543
Copy citation
Average score:
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
(0 votes)
Your score:
Voting is allowed only for
logged in
users.
Share:
Similar works from our repository:
Uporaba službenih psov policije
Službeni pes policije - oblika policijske dejavnosti
Šolanje in uporaba službenih psov v pravosodni policiji
Uporaba službenih psov pri preprečevanju nasilja
Uporaba psov na zasebnem ozemlju, v zasebnem varovanju in pri policiji
Similar works from other repositories:
Razvoj uporabe psov v oboroženih silah skozi zgodovino vojskovanja in današnja izkoriščenost njihovega potenciala v Slovenski vojski
Pasji potrošniki - družne živali v potrošni družbi
Etičnost družbenih odnosov do rejnih živali
Development of Cika cattle breed
Application of multivariate principal component analysis to morphological characterization of indigenous goats in SOuthern Nigeria
Hover the mouse pointer over a document title to show the abstract or click on the title to get all document metadata.
Secondary language
Language:
English
Title:
STRENGTH IMPROVEMENT WITH DELAYED ETTRINGITE FORMATION
Abstract:
Delayed ettringite formation (DEF) is a chemical reaction with proven damaging effects on hydrated concrete. Ettringite crystals can cause cracks and their widening due to pressure on crack walls caused by the positive volume difference in the reaction. Concrete may show improvements in strength at early ages but further growth of cracks causes widening and spreading of these cracks through the concrete structure. In this study, a potential to utilise the positive volume difference in DEF in order to improve mechanical properties of hydrated fine grained concrete is investigated. Finely dispersed crystallization nuclei achieved by adding air-entraining agent (AEA) and short vibration of specimens is presented as the main prerequisite for such improvements. The study presents the method and mechanism for obtaining the required crystallisation nuclei. Controlling long-term DEF by providing AEA-induced crystallisation nuclei prevented excessive and rapid initial strength improvements, and resulted in a 6% increase of compressive strength of fine grained concrete with only marginally lower density.
Keywords:
Delayed Ettringite Formation (DEF)
,
controlled DEF
,
ettringite crystals
,
aerated concrete
,
strength improvement
Comments
Leave comment
You must
log in
to leave a comment.
Comments (0)
0 - 0 / 0
There are no comments!
Back