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Title:MERJENJE NOTRANJIH DEFORMACIJ V CEMENTNIH MALTAH
Authors:ID Fister, Tadej (Author)
ID IVANIČ, Andrej (Mentor) More about this mentor... New window
Files:.pdf VS_Fister_Tadej_2009.pdf (2,04 MB)
MD5: 56F9E7B57607D23DD5880D7FF858A0C6
PID: 20.500.12556/dkum/61753ab7-e2c6-4b12-85f2-72942372c029
 
Language:Slovenian
Work type:Undergraduate thesis
Organization:FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
Abstract:V okviru diplomske naloge je bil razvit in izdelan merilec za merjenje volumenskih deformacij v cementni malti. Merilec je omogočal začetek merjenja takoj po vgraditvi v togi brezšivni jekleni kalup valjaste oblike, torej je bilo omogočeno spremljanje razvoja deformacij, ki se razvijejo v prvih urah po zamešanju cementne malte. Meritve so bile opravljene na čisti cementni malti in na malti, kateri je bila dodana kontrolirana količina aeranta. Aerant je bil uporabljen kot sredstvo za nastanek ciljne mikrostrukture cementne malte. Potrjena je bila hipoteza, da stabilizirani zračni mehurčki nudijo neomejen prostor za neovirano in intenzivno rast kristalov CH in etringita na obodu mehurčka in povzročijo volumensko ekspanzijo cementne matrice v začetni fazi hidratacije, ki je bistveno večja, kot pa je ekspanzija malte brez aeranta. V kasnejši fazi hidratacije pa zračni mehurčki vplivajo na intenzivnejše krčenje. Tendenca izmerjenih rezultatov notranjih deformacij, tako ekspanzije kot tudi krčenja, se giblje v skladu z navedbami literature.
Keywords:cement, hidratacija, aerant, krčenje, ekspanzija
Place of publishing:Maribor
Publisher:[T. Fister]
Year of publishing:2009
PID:20.500.12556/DKUM-10581 New window
UDC:666.9.015.42(043.2)
COBISS.SI-ID:13696022 New window
NUK URN:URN:SI:UM:DK:ATC3KIAU
Publication date in DKUM:14.12.2009
Views:3145
Downloads:214
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FG
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Secondary language

Language:English
Title:MEASUREMENT OF INTERNAL DEFORMATIONS IN CEMENTITIOUS MORTARS
Abstract:In the presented diploma thesis the device for measurement of volumetric deformations on cementitious mortars was developed and manufactured. The device enabled starting the measurements immediately after casting of fresh mortars into rigid cylindrical steel molds, which gives a possibility of recording the early-age deformations. Two experimental mortar mixes were used: plain cement mortar and the mortar with addition of air entraining agent (AEA). The addition of AEA caused the formation of the microstructure with finely dispersed air bubbles forming an unlimited space for growth of CH crystals and ettringite. The formation of ettringite and CH crystals is considered as a principal cause of early-age expansion much higher on mortars with AEA. Subsequent shrinkage was found to be also more intense on mortars with AEA. The results of measurements performed in this study are in accordance with findings of literature.
Keywords:cement, hydration, air entraining agent, shrinkage, expansion


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