diplomska naloga
Povzetek
Diplomsko delo je zajemalo preiskave svežega in strjenega lahkovgradljivega betona različnih
sestav z enakim vodo-vezivnim razmerjem. Preiskovali smo štiri različne mešanice betonov,
ki so se medsebojno razlikovale po vrsti agregata in/ali veziva. Vsi betoni so bili pripravljeni
z uporabo kemijskega dodatka – superplastifikatorja nove generacije. V preiskave smo
vključili dve vrsti drobljenega karbonatnega agregata, Portland cement ter mineralni dodatek,
elektrofiltrski pepel, ki je nadomestil 20 % cementa v vezivu.
V prvem delu preiskav smo vplive agregatov in mineralnega dodatka preverjali preko
reoloških lastnosti svežih betonskih mešanic v časovnem intervalu ene ure po končanem
mešanju. S posedom in razlezom smo preskušali konsistenco svežega betona, s porozimetrom
pa vsebnost por v mešanici. Z reometrom smo določili napetost na meji tečenja in plastično
viskoznost mešanic.
Drugi del preiskav je bil namenjen določanju mehanskih lastnosti. Na strjenih vzorcih betona
smo po 3-eh, 28-ih in 90-ih dneh določali njihove tlačne trdnosti, module elastičnosti in
odpornost proti prodoru vode. Nazadnje smo, s pomočjo rezultatov preiskav, primerjali
omenjene karakteristike ter ocenili vplive različnih vrst agregata in uporabljenega
mineralnega dodatka na karakteristike svežega in strjenega b
Ključne besede
gradbeništvo;diplomska dela;UNI;lahkovgradljiv beton;vrsta agregata;elektrofiltrski pepel;obdelavnost betonana;trdnost betona;elastični model betona;vodoprepustnost betona;slv;
Podatki
Jezik: |
Slovenski jezik |
Leto izida: |
2012 |
Tipologija: |
2.11 - Diplomsko delo |
Organizacija: |
UL FGG - Fakulteta za gradbeništvo in geodezijo |
Založnik: |
[A. Lešnik] |
UDK: |
66.018:691.3(043.2) |
COBISS: |
6050657
|
Št. ogledov: |
3442 |
Št. prenosov: |
605 |
Ocena: |
0 (0 glasov) |
Metapodatki: |
|
Ostali podatki
Sekundarni jezik: |
Angleški jezik |
Sekundarni naslov: |
Influence of aggregate and mineral additive type on the rheological and mechanical properties of highly flowable concrete |
Sekundarni povzetek: |
This thesis deals with the properties of fresh and hardened highly flowable concrete of various
compositions with the same water-binder ratio. We examined four different concrete mixtures
which differed by the type of aggregate and/or binder. All concrete mixtures were prepared
with a polycarboxylate superplasticizer. We studied the influence of two types of crushed
carbonate aggregate, i.e. Portland cement CEM I and mineral additive fly ash, with witch we
replaced 20 % of the Portland cement in the binder.
In the first part of the study we tested the influences of the type of aggregates and mineral
additive through rheological properties of fresh concrete mixtures in the period of one hour
after mixing. Using slump test and flow table test we estimated the consistency of fresh
concrete. We used porosimeter to determine the amount of air bubbles in concrete and
rheometer to measure yield stress value and plastic viscosity of the concrete mixtures.
In the second part of the study we determined mechanical properties. Using samples of
hardened concrete, we evaluated its compressive strength, modulus of elasticity and resistance
to penetration of water after 3, 28 and 90 days. The results of the study were used to compare
the above mentioned properties and to evaluate the influences of various types of aggregates
and mineral additive on the properties of fresh and hardened concrete. |
Sekundarne ključne besede: |
graduation thesis;civil engineering;highly flowable concrete;aggregate type;fly ash;workability of concrete;compressive strengtht of concrete;modulus of elasticity of concrete;permeability of concrete; |
Vrsta datoteke: |
application/pdf |
Vrsta dela (COBISS): |
Diplomsko delo |
Komentar na gradivo: |
Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo |
Strani: |
XIII, 71 str. |
ID: |
8714284 |