Investigation of cement based composites made with recycled rubber aggregate/Istrazivanje kompozita na bazi cementa spravljenih sa recikliranom gumom kao agregatom

• Published in: Hemijska industrija 2012-07, Vol.66 (4), p.609
• Main Authors: Jevtic, Dragica Lj, Zakic, Dimitrije M, Savic, Aleksandar R
• Format: Article
• Language: English
• Subjects: Analysis; Investigations; Mechanical properties; Rubber
• ISSN: 0367-598X
• DOI: 10.2298/HEMIND111203010J

The results of experimental investigations performed on cement based composites made with addition of recycled rubber as a partial replacement of natural river aggregate are presented in this paper. Different properties of cement based mortar were analyzed, both in fresh and in hardened state. The tested properties in the fresh state included density, consistency and volume of entrained air. In the hardened state, the following properties were tested: density, mechanical properties (compressive and flexural strength), modulus of elasticity, adhesion to concrete substrate, water absorption, freeze-thaw resistance and ultrasonic pulse velocity. The obtained results indicate that recycled rubber can be successfully applied as a partial replacement of natural river aggregate in cement based composites, in accordance with the sustainable development concept. The investigation showed that physical-mechanical properties of cementituous composites depend to a great extent on the percentage of replacement of natural river aggregate with recycled rubber, especially when the density, strength, adhesion and freeze-thaw resistance are concerned. The best results were obtained in the freeze-thaw resistance of such composites. Keywords: composite, recycled rubber, mortar, natural river aggregate, cement, physical-mechanical properties. U radu su prikazani rezultati sopstvenih eksperimentalnih istrazivanja sprovedenih na cementnim kompozitima spravljenim sa dodatkom reciklirane gume kao delimicnom zamenom sitnog recnog agregata. Analizirana su razlicita svojstva cementnih maltera kako u svezem, tako i u ocvrslom stanju. Od svojstava u svezem stanju ispitani su: zapreminska masa, konzistencija i sadrzaj uvucenog vazduha. U ocvrslom stanju, ispitana su sledeca svojstva: zapreminska masa, mehanicka svojstva (cvrstoca pri pritisku i pri savijanju), modul elasticnosti, athezija za betonsku podlogu, upijanje vode, otpornost na mraz i brzina prostiranja ultrazvuka. Dobijeni rezultati pokazali su da se reciklirana guma moze uspesno upotrebiti kao delimicna zamena za klasican (recni) agregat kod kompozita spravljenih na bazi cementa, u skladu sa konceptom odrzivog razvoja. Istrazivanje je pokazalo da od procenta zamene recnog agregata recikliranom gumom u velikoj meri zavise fizicko-mehanicka svojstva cementnih kompozita, a narocito zapreminska masa, cvrstoca, adhezija i otpornost na dejstvo mraza. Najbolji rezultati dobijeni su pri ispitivanju otpornosti na dejstvo mraza. Kljucne