Samozgoščevalni in vibrirani betoni z apnenčevo moko

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Language:	Slovenian
Year of publishing:	2008
Source:	Ljubljana
Typology:	2.08 - Doctoral Dissertation
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[D. Duh]
UDC:	691.215+691.32(043.3)
COBISS:	4231009
Views:	1974
Downloads:	477
Average score:	0 (0 votes)
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Secondary language:	English
Secondary title:	Self-compacting and vibrated concretes with limestone powder
Secondary abstract:	The thesis is divided into two connected parts. The first part deals with design, mixing and characteristics of self-compacting concrete (SCC) and vibrated concrete with limestone powder. In the framework of SCC mixture design extensive tests on cement pastes, mortars and concrete mixtures with different mineral additions and chemical admixtures were done. Characteristics of fresh and hardened concrete were obtained with standard and non-standard methods on »macro« and »micro« level. The microscopical analysis showed some essential differences in microstructure of the discussed concretes, which gave a good explanation for the observed behaviours. Further on, analytical models for the evolution of mechanical properties of SCC with limestone powder were developed. In the scope of durability of SCC and vibrated concrete with limestone powder the main focus was on salt frost scaling and sulfate attack. The second part of the thesis presents linear and planar stereological approach to computer assisted determination of air void characteristics in hardened concrete. Original solutions for some significant missing links and mathematical problems in this research area were proposed and successfully integrated in the developed computer applications, called LMAir and PMAir, for linear and planar analysis of air void system in hardened concrete, respectively. A true physical background of the Powers spacing factor was studied as well, according to which an outline for upgraded formula was proposed.
Secondary keywords:	self-compacting concrete;limestone powder;mix design;analytical models;mechanical properties;durability;microscopical analysis;stereology;automation;Powers spacing factor;
URN:	http://www.dlib.si/?urn=URN:NBN:SI:doc-YQXUIJ21
File type:	application/pdf
Type (COBISS):	Dissertation
Thesis comment:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages:	XXXII, 200 str., pril.
Type (ePrints):	thesis
Title (ePrints):	Self-compacting and vibrated concretes with limestone powder
Keywords (ePrints):	samozgoščevalni beton;apnenčeva moka;projektiranje;analitični modeli;mehanske lastnosti;obstojnost;mikroskopska analiza;stereologija;avtomatizacija;Powersov faktor oddaljenosti
Keywords (ePrints, secondary language):	self-compacting concrete;limestone powder;mix design;analytical models;mechanical properties;durability;microscopical analysis;stereology;automation;Powers spacing factor
Abstract (ePrints):	Doktorska disertacija je vsebinsko razdeljena na dva med seboj povezana dela. Prvi del je posvečen projektiranju, zamešanju in lastnostim samozgoščevalnih (SCC) in vibriranih betonov z apnenčevo moko. V okviru projektiranja SCC mešanic so bile izvedene številne preiskave na cementnih pastah, maltah in na betonskih mešanicah z različnimi vrstami mineralnih in kemijskih dodatkov. Lastnosti betonov v svežem in v strjenem stanju so bile določene s standardnimi in nestandardnimi metodami na »makro« in na »mikro« ravni. Mikroskopske analize so pokazale nekatere bistvene razlike v mikrostrukturi obravnavanih betonov, ki dobro razlagajo opaženo obnašanje materiala na »makro« nivoju. Izdelani so bili analitični modeli za časovne razvoje mehanskih lastnosti SCC z apnenčevo moko. V okviru obstojnostnih karakteristik SCC in vibriranih betonov z apnenčevo moko je bil poudarek na odpornosti površine betona proti zmrzovanju in tajanju v prisotnosti talilnih soli in na odpornosti betona proti sulfatni koroziji. Drugi del disertacije obravnava linijski in planarni stereološki pristop k avtomatizaciji metode za ugotavljanje značilnosti zračnih por v strjenem betonu. Predstavljene so izvirne rešitve za pomembne detajle in matematične probleme na tem področju, na podlagi katerih smo izdelali računalniški aplikaciji LMAir in PMAir za avtomatsko izvedbo te stereološke metode. Predstavljena je tudi študija pravega fizikalnega ozadja Powersovega faktorja oddaljenosti in smernice za »posodobljeno« formulo tega stereološkega parametra, ki bi zajela tudi kvaliteto cementnega kamna v betonu. UVODNE STRANI IV BIBLIOGRAPHIC-DOCUMENTALISTIC INFORMATION UDC 691.215+691.32(043.3) Author David
Abstract (ePrints, secondary language):	The thesis is divided into two connected parts. The first part deals with design, mixing and characteristics of self-compacting concrete (SCC) and vibrated concrete with limestone powder. In the framework of SCC mixture design extensive tests on cement pastes, mortars and concrete mixtures with different mineral additions and chemical admixtures were done. Characteristics of fresh and hardened concrete were obtained with standard and non-standard methods on »macro« and »micro« level. The microscopical analysis showed some essential differences in microstructure of the discussed concretes, which gave a good explanation for the observed behaviours. Further on, analytical models for the evolution of mechanical properties of SCC with limestone powder were developed. In the scope of durability of SCC and vibrated concrete with limestone powder the main focus was on salt frost scaling and sulfate attack. The second part of the thesis presents linear and planar stereological approach to computer assisted determination of air void characteristics in hardened concrete. Original solutions for some significant missing links and mathematical problems in this research area were proposed and successfully integrated in the developed computer applications, called LMAir and PMAir, for linear and planar analysis of air void system in hardened concrete, respectively. A true physical background of the Powers spacing factor was studied as well, according to which an outline for upgraded formula was proposed.
Keywords (ePrints, secondary language):	self-compacting concrete;limestone powder;mix design;analytical models;mechanical properties;durability;microscopical analysis;stereology;automation;Powers spacing factor
ID:	8311035