Karakteristike asfaltnih mešavina sa agregatom od recikliranog betona
Properties of Asphalt Concrete Mixtures with Recycled PCC Aggregate.
Doktorand
Radević, Aleksandar V.Mentor
Mladenović, GoranČlanovi komisije
Topličić-Ćurčić, GordanaZakić, Dimitrije
Savić, Aleksandar
Metapodaci
Prikaz svih podataka o disertacijiSažetak
U cilju implementacije i promocije održivog razvoja u oblasti graditeljstva,
sprovedena su obimna eksperimentalna ispitivanja kako karakteristika recikliranog
agregata (RCA), tako i karakteristika asfaltnih mešavina sa delimičnom zamenom
prirodnog agregata recikliranim. Reciklirani agregat koji je korišćen u istraživanju
dobijen je drobljenjem originalnog cementnog betona klase čvrstoće C35/45.
U cilju poboljšanja kvaliteta recikliranog agregata, krupan RCA (d>4 mm) je
izložen tretmanima hlorovodoničnom kiselinom (potapanjem u 0.1 mol/dm3 HCl) i
ubrzanoj karbonatizaciji (koncentraciji CO2 od 4%). Pomenutim tretmanima su u
manjoj meri poboljšane karakteristike RCA, pa su dalja ispitivanja uticaja RCA na
karakteristike asfalt betona sprovedena samo za netretirani RCA.
Eksperimentalnim ispitivanjima je obuhvaćeno 10 asfaltnih mešavina. Osim
kontrolne mešavine, formirane su tri grupe mešavina sa delimičnom zamenom sitnog
(0/4 mm), krupnog (4/22.5 mm) i sitnog i krupnog (0/22.5 mm) prirodno...g agregata
recikliranim. Svaku grupu su činile mešavine sa tri različita sadržaja RCA: 15%, 30% i
45%. Projektovane su asfaltne mešavine za noseći sloj kolovozne konstrukcije AC 22
BASE sa ciljanim sadržajem šupljina ispunjenih vazduhom od 5.2%.
Glavni deo eksperimentalnog rada je obuhvatio ispitivanje modula krutosti i
otpornosti asfalntih mešavina na dejstvo vode, trajnu deformaciju, zamor i niske
temperature. Dobijeni rezultati su pokazali da je moguća primena kompletnog RCA (i
sitan i krupan agregat); da mešavine sa RCA imaju istu ili bolju otpornost na zamor u
odnosu na kontrolnu mešavinu; i da je maksimalna količina RCA u manjoj meri
ograničena otpornošću na niske temperature.
Na osnovu analize dobijenih rezultata razvijena je metodologija za upotrebu
RCA kao delimične zamene prirodnog agregata i date su preporuke za dalja istraživanja.
As a part of the implementation and promotion of sustainable construction
development, large experimental research was conducted. This research included testing
of the recycled concrete aggregate (RCA) and properties of asphalt mixtures in which
this aggregate was applied as a partial replacement of the natural aggregate. Recycled
concrete aggregate used in the conducted experiments was obtained by crushing of the
original cement concrete (strength class C35/45).
In order to improve it's quality, coarse RCA was exposed to the treatments with
hydrochloric acid (by pre-soaking into 0.1 mol/dm3 HCl) and carbon dioxide
(accelerated carbonation with 4% concentration of CO2). Mentioned treatments induced
improvements in the properties of RCA, to a lesser extent. Therefore, only untreated
RCA was used as a partial replacement of the natural aggregate in production of asphalt
mixtures.
Experimental research was conducted on the 10 different asphalt mixtures. Three
groups of mixtures with RCA w...ere tested in addition to the control mixture. In the first
group, only fine aggregate (0/4 mm) was replaced by RCA; in the second group, the
replacement was applied only to coarse aggregate (4/22.4 mm), while the third group
included mixtures in which both fine and coarse aggregate were replaced by RCA. Each
group included three different contents of RCA: 15%, 30%, and 45%. All asphalt
mixtures were designed for the base course AC 22 BASE, targeting 5.2% of air
entrained voids.
Main part of the experiment consisted of different asphalt mixture’s testing, such
as measurements of: the stiffness modulus, resistance to water, permanent deformation,
fatigue and low temperatures. Obtained results show that application of the total (both
fine and coarse) RCA is possible as mixtures with RCA expressed equal or improved
fatigue resistance when compared to the referent mixture. Still, the amount of the RCA
used should be limited according to its low temperatures resistance.
Methodology for the RCA application, when it is used as a partial replacement
of the natural aggregate in asphalt mixtures, was developed based on the presented
results, together with guidelines for the future research.
Fakultet:
Универзитет у Београду, Грађевински факултетDatum odbrane:
19-06-2017Projekti:
- Istraživanje stanja i metoda unapređenja građevinskih konstrukcija sa aspekta upotrebljivosti, nosivosti, ekonomičnosti i održavanja (RS-MESTD-Technological Development (TD or TR)-36048)