o:1664 Uticaj dodatka fino samlevenog recikliranog stakla od katodnih cevi na svojstva cementnog maltera i betona Effect of addition of finely milled recycled glass obtained from cathode tubes on the properties of cement mortar and concrete : doctoral dissertation sr In the experimental part of the dissertation, the potential of usage of finely milled CRT glass (<0,063 μm) in making mortar and concrete is tested and analyzed. Eight mortar and concrete mixtures each have been made. Pulverized glass is used to replace a share of cement, the replacement percentage in both composites being: 5%, 10%, 15%, 20% and 35%, by mass. The adopted upper limit for replacement of cement with glass is in accordance with the maximum share of other mineral admixtures in CEM II cement. Also, two batches of mortars and concretes were made with addition of 5% and 10% of CRT to total amount of cement. A comprehensive testing of properties of fresh cement composites modified in this manner has been conducted, as well as of mechanical strengths, rheological characteristics and durability. Among other things, durability tests included: freeze/thaw resistance and freeze/thaw resistance with deicing salt, water impermeability, sulphate attack and leaching tests. Also, a SEM and EDS analysis of mortar and concrete samples is conducted. The analysis and processing of the results helped form the conclusions regarding potential of usage of CRT glass for making mortar and concrete, and assess durability of these modified cement composites. Finely milled cathode ray tube glass is puzzolanically active and does not cause alkali-silicate reaction. In mortars, CRT glass can be used for replacement up to 20% without causing any considerable decline of compressive or flexural strengths, while mortar retains its integrity under freeze/thaw conditions. Addition of glass up to 10% in relation to the total amount of cement in mortar improves physical-mechanical properties. Mechanical strengths of concrete with a share of cement replaced with CRT up to 15% are improved. Durability of concrete with the same share of replacement is not compromised. is The replacement of 20% by mass can be considered the upper limit for replacement of a share of cement with glass in concrete mixes, whereby the mechanical strengths of concrete are negligibly degraded, while durability in terms of action of freeze/thaw with deicing salt is questionable. The results the leaching test of concrete with CRT glass confirm that these concretes do not present an environmental challenge. Biografija autora: list 271;Bibliografija: listovi 212-223. Datum odbrane: 26.02.2020. Civil engineering materials and Concrete technology 16905737 91552101 7536 91552100 16905737 2020-08-24T17:18:02.053Z 45 no 46 mentor Dušan 1988- Grdić 2019 63 mentor Nenad 1982- Ristić 2019 63 član komisije Gordana 1961- Topličić Ćurčić 2019 63 član komisije Vlastimir 1957- Radonjanin 2019 63 član komisije Mirjana 1958- Malešev 2019 63 član komisije Dimitrije 1967- Zakić 2019 V, 271 list 52626407 http://phaidrabg.bg.ac.rs/o:1664 no yes 4 2020-08-24T17:18:02.320Z 70 katodno staklo, malteri, betoni, mehaničke čvrstoće, trajnost,ekologija, životna sredina cathode ray tube glass, mortars, concretes, mechanical properties,durability, environment 691:620.1(043.3)691.555:004.353.253(043.3)691.3:004.353.253(043.3) T 002, T 150, T 152 1738 18A01 2019