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| Avtorstvo: |
Jana ŠELIH // 1.08 Objavljeno predavanje na znanstveni konferenci
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| Leto: |
1996 |
| Citat: |
GERBEC, Boštjan, ŠELIH, Jana. Chemical attack resistance of polymer modified
mortar exposed to a sea water. V: Third CANMET/ACI international conference
on concrete in marine environment, St. Andrews by-the-Sea New Brunswick,
Canada, August 4 - 9, 1996. Supplementary papers. Detroit: American
Concrete Institute, 1996, str. 221-238. |
| Povzetek: |
A part of a wide study
directed to the behaviour of polymer modified mortars exposed to several
aggressive media is presented. Chemical attack resistance of polymer
modified mortar was evaluated by a modified Koch-Steinegger test. The mortar
prisms were cured in lime water for 21 days, and then immersed in three
different aggressive liquids, namely sea water, 4,4% sodium sulfate solution,
and 3% ammonium sulfate solution. A reference set of samples was immersed
in distilled water. Flexural and compressive strength was measured after 14,
28 and 56 days of exposure to the aggressive liquid, and visual rating of
surfaces of samples was also conducted at these times. Two different types
of cement were used, namely, normal portland cement and sulfate resistant
cement. The polymer added was buthadien-styren based, and added in water
dispersion form. Water to cement ratio varied from 0.37 to 0.41 in order to
achieve equal plasticity for all types of mortar tested. The results
obtained show that all types of mortar tested are resistant to chemical
attack in sea water. Polmer modified mortar performs better than the
reference mortar with no added polymer when sulfate resistant cement is
used. Further, all mortar samples investigated exhibit no resistance to
ammonium sulfate attack
Članek predstavlja del širše zastavljene
študije obnašanja s polimeri modificiranih malt. Odpornost na korozijo smo
ocenili s pomočjo modificiranega Koch-Steineggerjevega testa, kot agresivne
medije pa smo izbrali natrijev in amonijev sulfat ter morsko vodo. Po 14, 28
in 56 dneh izpostavljenosti agresivnemu mediju smo merili upogibno in tlačno
trdnost, ter na podlagi teh meritev smo določili odpornostni koeficient.
Prizme so bile narejene z Portland in sulfatno odpornim cementom.
Uporabljeni polimer je butadienstirenskega tipa, vodocementno razmerje pa se
giblje med 0.37 in 0.41. Rezultati kažejo, da so vsi preskušeni vzorci malte
odporni na korozijo morske vode. V primeru, ko smo uporabili sulfatno
odporen cement, je dodatek polimer izboljšal odpornost. Vsi preskušeni
vzorci so bili neodporni na korozijo amonijevega sulfata |
| Tipologija: |
1.08 Objavljeno predavanje na znanstveni konferenci |
| COBISS ID |
125031 Polni zapis iz sistema COBISS |
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Vpisal 2001/08/08 19:56
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