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Organska sintetična vlakna za ojačitev cementnih matric
Kotar, Mojca ; Malej-Kveder, Sonja ; Šušteršič, Jakob
Ojačitev krhkih cementnih matric z vlakni izboljša njihovo odpornost proti nateznim, upogibnim in udarnim obremenitvam. Za dober ojačitveni učinek morajo imeti vlakna čim boljše mehanske lastnosti ...(predvsem elastični modul) in dobro odpornost proti alkalnemu mediju cementne paste (pH 12,5 do 13). Raziskali smo alkalno odpornost in ojačitveno delovanje PA6, aramidnih, PP, PAN in PVA filamentnih prej.Vse preiskane filamentne preje so glede mehanskih lastnosti in alkalnih obstojnosti primerne za ojačitev cementnih matric. Po standardnem 28-dnevnem strjevanju dosegajo najboljše natezne mehanske lastnosti kompoziti z armiranimi filamentnimi prejami, po pospešenem staranju do starosti 4 in 65 let pa kompoziti s poliakrilnitrilnimi filamentnimi prejami. Ojačitveno delovanje ostalih filamentnih prej se s staranjem poslabša ne glede na ugotovljeno alkalno odpornost.
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