Vol.8, No 4, 2010 pp. 413 - 423
UDC 691.322+691.54:691.32:539.41(045)=111
DOI: 10.2298/FUACE1004413G
CONCRETE AGGREGATE AND CEMENT MASS CONTENT EFFECTS ON COMPRESSIVE STRENGTH
Zoran Grdić, Gordana Topličić Ćurčić, Nikola Stojić
Faculty of Civil Engineering and Architecture, University of Niš, Serbia
E-mail: zoran.grdic@gaf.ni.ac.rs
The mass content of aggregate (ma) and of cement (mc) of concrete comprise coefficient calculated as ma/mc. Some methods used for designing of concrete mixtures take into consideration this coefficient. In this paper, concrete mixtures were prepared so that mass of cement, water cement factor and granulometric composition have been varied. Values of the coefficient ma/mc in experimental research ranged between 7,20 in concrete mixtures mixed with 250 kg of cement to 3,60 in concrete mixtures mixed with 500 kg per 1m3. From the aspect of compressive strength of concrete, it has been established that optimum values of the coefficient ma/mc depend on the granulometric composition and water cement factor. At higher water cement factors, larger values of ma/mc coefficient are required to achieve the maximum strength under the given conditions.
Key words: aggregate mass, cement mass, concrete compressive strength.
UTICAJ MASENOG UČEŠĆA AGREGATA I CEMENTA U BETONU NA ČVRSTOĆU PRI PRITISKU
Pod masenim učešćem agregata (ma) i cementa (mc) u betonu podrazumeva se koeficijent koji se izračunava kao ma / mc. Neke metode koje se koriste za projektovanje sastava betonskih mešavina uzimaju u obzir ovaj koeficijent. U ovom radu betonske mešavine su spravljene tako da je varirana masa cementa, vodocementni faktor i granulometrijski sastav. Vrednosti koeficijenta ma/mc u eksperimentalnom istraživanju kretale su se od 7,20 kod betonskih mešavina spravljanih sa 250 kg cementa do 3,60 kod betona koji su spravljani sa količinom cementa od 500 kg po 1m3. Posmatrano sa aspekta čvrstoće pri priitsku betona, utvrđeno je da optimalne vrednosti koeficijenta ma/mc zavise od granulometrijskog sastava i vodocementnog faktora. Pri većim vodocementnim faktorima potrebne su veće vrednosti koeficijenta ma/mc da bi se pod datim uslovima ostvarile maksimalne čvrstoće.
Ključne reči: masa agregata, masa cementa, čvrstoća pri pritisku betona