magistrsko delo
Povzetek
V magistrski nalogi je predstavljena priprava injekcijskih mešanic na osnovi dolomitnega polnila z
različnimi mineralnimi vezivi za injektiranje kulturnozgodovinskih objektov. Pripravili in testirali smo
injekcijske mešanice, ki so kompatibilne s sestavinami kamnitih zidov kulturne dediščine. Magistrska
naloga je eksperimentalne narave in je v celoti zasnovana v obliki različnih preiskav svežih in strjenih
injekcijskih mešanic na cilindričnih preizkušancih in standardnih prizmah. Injekcijske mešanice smo
pripravili na osnovi hidratiziranega apna, apna z dodatkom tufa ter apna z dodatkom cementa. Kot
polnilo smo uporabili dolomitno moko. Ustreznost sveže injekcijske mešanice smo preverili na
podlagi testov pretočnosti in izločanja vode. Izkazalo se je, da le apneno – cementni mešanici ustrezata
kriterijema, pri ostalih pa smo imeli težavo s prekomernim izločanjem vode. V različnih časovnih
obdobjih (35, 70 in 105 dni) smo na cilindričnih preizkušancih in standardnih prizmah izvajali
preiskave strjenih injekcijskih mešanic. Prizme smo izpostavili različnim pogojem staranja na zraku,
pri povišani temperaturi v NaOH raztopini in v zaprtih plastičnih posodah. Na osnovi rezultatov tlačne
in upogibne trdnosti prizem smo sklepali, da se je razvila alkalno-karbonatna reakcija med dolomitnim
polnilom in mineralnim vezivom na vzorcih izpostavljenih NaOH raztopini. Najvišje vrednosti tlačne
in upogibne trdnosti smo dobili na apneno – cementnih vzorcih. Na valjih in prizmah smo s
fenolftaleinskim testom spremljali stopnjo karbonatizacije, ki je bila najbolj intenzivna na prizmah. V
jedru valjev je zaradi omejenega dotoka zraka za časa staranja preskušancev, potek karbonatizacije
dolgotrajen. Dejstvo je, da pri injektiranju apnenih mešanic, le-te imajo pomanjkljivost počasnega
strjevanja v zaprtih prostorih ter manjše trdnostne karakteristike v primerjavi s čistimi cementnimi
mešanicami. V tem kontekstu, apneno-cementne mešanice imajo določeni potencial. Namen
opravljenih raziskav je postaviti osnovo za nadaljnje raziskave apnenih injekcijskih mešanic na osnovi
hidratiziranega apna in dolomitnega polnila.
Ključne besede
gradbeništvo;magistrska dela;apnene injekcijske mešanice;injektiranje;dolomitna moka;preiskave injekcijskih mešanic;
Podatki
Jezik: |
Slovenski jezik |
Leto izida: |
2015 |
Tipologija: |
2.09 - Magistrsko delo |
Organizacija: |
UL FGG - Fakulteta za gradbeništvo in geodezijo |
Založnik: |
[K. Rojc] |
UDK: |
691.53:022.2:(043.3) |
COBISS: |
7156577
|
Št. ogledov: |
1792 |
Št. prenosov: |
574 |
Ocena: |
0 (0 glasov) |
Metapodatki: |
|
Ostali podatki
Sekundarni jezik: |
Angleški jezik |
Sekundarni naslov: |
The preparation of injection grouts based on dolomite filler for stone masonry walls |
Sekundarni povzetek: |
The objective of the presented master's thesis is the preparation of grout mixtures on the basis of
dolomite filling with different mineral binders for the grouting of cultural and historic heritage
buildings. Grout mixtures, which are compatible with the ingredients of existing stone walls of
heritage objects were prepared and tested. The master's thesis serves experimental purposes and is
fully based on different investigations of fresh and hardened injection mixtures on cylindrical test
objects and standard prisms. The prepared grout mixtures were based on hydrated lime, lime with
added tuff as well as lime and cement. Dolomite flour was used as filling material. The adequacy of
the fresh injection mixture was tested according to flow properties and water release. It has been
proven that only the lime and cement mixture conforms both criteria, whereas other mixtures showed
excessive water release. Hardened injection mixtures were tested on cylindrical test objects and
standard prisms in different time frames (35, 70 and 105 days). The prisms were exposed to different
ageing conditions on air, at elevated temperature in the NaOH solution and in closed plastic
containers. According to the results of compressive and tensile strength testing, it can be assumed that
alkali-carbonate reaction developed between the dolomite filling and the mineral binder on test
subjects exposed in the environment of NaOH solution. The highest levels of compressive and tensile
strength were achieved using the lime-cement test objects. The phenolphthalein test on cylinders and
prisms was used to determine the level of carbonization, which was the most intensive on prisms. Due
to the limited air intake during the ageing of test specimens, the process of carbonization in the core of
the cylinder is a long-term one. The fact is that when injecting the lime mixtures, their weak point is
that the process of solidifying in closed spaces is slow and that their obtained strengths are lower
compared to the pure cement mixtures. However, the lime-cement mixtures have a certain potential.
The purpose of conducted research is to prepare the solid grounds for further research of lime injection
mixtures on the basis of hydrated lime and dolomite filling. |
Sekundarne ključne besede: |
civil engineering;master of science thesis;lime-based injection grouts;grouting;dolomite flour;tests of injection grouts; |
Vrsta datoteke: |
application/pdf |
Vrsta dela (COBISS): |
Magistrsko delo/naloga |
Komentar na gradivo: |
Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo |
Strani: |
XVI, 83 str. |
ID: |
8890240 |