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Vpliv kemijskih in mineralnih dodatkov na reološke lastnosti svežih cementnih malt : diplomska naloga
Merlin, Gregor (Author), Bokan-Bosiljkov, Violeta (Mentor) More about this mentor... This link opens in a new window, Hočevar, Andraž (Thesis defence commission member), Lopatič, Jože (Thesis defence commission member)

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Abstract
Glavni namen diplomskega dela je bil preučiti vpliv kemijskih in mineralnih dodatkov na reološke lastnosti sveže cementne malte, tako imenovane malte CEM. Recepture maltnih mešanic smo pripravili na podlagi betonskih mešanic, z uporabo metode betonu ekvivalentne malte (metoda CEM). Meritve smo izvajali v Konstrukcijsko-prometnem laboratoriju Fakultete za gradbeništvo in geodezijo Univerze v Ljubljani. Reološke parametre smo merili z reometrom ConTec Viscometer 5, ter z vzporednimi meritvami razleza malte na stresalni mizici. Zamešali in testirali smo 26 različnih mešanic, ki jih lahko razvrstimo v 8 skupin. Vse mešanice so vsebovale agregat, cement in vodo. Mešanice se razlikujejo po vsebnosti kemijskih in mineralnih dodatkov, vrsti cementa in vodocementnem razmerju. Mineralni dodatki, s katerimi smo zamenjali del cementa, so bili mikrosilika, tuf in mleta granulirana plavžna žlindra. Kemijska dodatka, ki smo ju uporabili v študiji, sta bila superplastifikator in aerant. Uporabili smo tudi dva različna cementa. Rezultate meritev smo prikazali v obliki reografov in grafikonov, ki prikazujejo odvisnost strižne napetosti na meji tečenja ali razleza malte od deleža posamezne sestavine, katere vpliv smo ugotavljali. Preiskave smo izvajali takoj po zamešanju malte ter po preteku 20 min, 40 min in 60 min.

Language:Slovenian
Keywords:gradbeništvo, diplomska dela, SOG, reološke lastnosti svežih cementnih malt, vpliv dodatkov, vodocementno razmerje, razlez, reometer ConTec Viscometer 5, strižna napetost na meji tečenja, plastična viskoznost
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2016
Publisher:[G. Merlin]
Number of pages:XI, 60 str., [12] str. pril.
UDC:532.135:691.54(043.2)
COBISS.SI-ID:7741025 Link is opened in a new window
Views:762
Downloads:372
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Secondary language

Language:English
Title:Influence of chemical and mineral admixtures on rheological properties of fresh cement mortars
Abstract:
The main purpose of the thesis was study of influence of chemical admixtures and mineral additives on the rheological properties of fresh cement mortar, so called CEM mortar. Composition of particular mortar mixture was determined from composition of relevant concrete mixture, by concrete equivalent mortar method (CEM method). All the measurements were performed in laboratory of the Faculty of Civil and Geodetic Engineering of University of Ljubljana. The rheological parameters were measured using a rheometer ConTec Viscometer 5 and by parallel measurements of mortar flow value on flow table. Research on the concrete, comparison between concrete and mortar mixtures and evaluation of CEM method were carried out within the thesis and doctoral dissertation. 26 different mortar compositions, which can be classified into 8 groups, were mixed and tested. All mixtures contained aggregate, cement and water. The mixtures differ by the content of chemical admixtures and mineral additives, type of cement and water to cement ratio. Mineral additives, which replaced part of the cement, were microsilica, tuff and ground granulated blast furnace slag. Chemical admixtures used in the study were superplasticizer and air entraining agent. We used also two different type of cement. Test results are presented in reographs and graphs that show relationship between yield value or flow value and content of studied mortar constituent. The tests were carried out immediately after the mixing of mortar was completed and 20 min, 40 min and 60 min after the mixing completion.

Keywords:graduation thesis, civil engineering, Rheological properties of fresh cement mortars, admixtures influence, water-to-cement ratio, spread, Rheometer ConTec Viscometer 5, yield value, plastic viscosity

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