Samozgoščevalni in vibrirani betoni z apnenčevo moko

Povzetek

Ključne besede

Podatki

Jezik:	Slovenski jezik
Leto izida:	2008
Izvor:	Ljubljana
Tipologija:	2.08 - Doktorska disertacija
Organizacija:	UL FGG - Fakulteta za gradbeništvo in geodezijo
Založnik:	[D. Duh]
UDK:	691.215+691.32(043.3)
COBISS:	4231009
Št. ogledov:	1974
Št. prenosov:	477
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Self-compacting and vibrated concretes with limestone powder
Sekundarni povzetek:	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.
Sekundarne ključne besede:	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
Vrsta datoteke:	application/pdf
Vrsta dela (COBISS):	Doktorska disertacija
Komentar na gradivo:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Strani:	XXXII, 200 str., pril.
Vrsta dela (ePrints):	thesis
Naslov (ePrints):	Self-compacting and vibrated concretes with limestone powder
Ključne besede (ePrints):	samozgoščevalni beton;apnenčeva moka;projektiranje;analitični modeli;mehanske lastnosti;obstojnost;mikroskopska analiza;stereologija;avtomatizacija;Powersov faktor oddaljenosti
Ključne besede (ePrints, sekundarni jezik):	self-compacting concrete;limestone powder;mix design;analytical models;mechanical properties;durability;microscopical analysis;stereology;automation;Powers spacing factor
Povzetek (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
Povzetek (ePrints, sekundarni jezik):	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.
Ključne besede (ePrints, sekundarni jezik):	self-compacting concrete;limestone powder;mix design;analytical models;mechanical properties;durability;microscopical analysis;stereology;automation;Powers spacing factor
ID:	8311035