Wpływ nanokrzemionki na mrozoodporność zapraw z cementu z dodatkiem popiołu lotnego, dojrzewających w warunkach korozyjnych, w różnych temperaturach

• Autorzy: Zhang Yan , Liu Huaqing , Tong Ruiming , Ren Jun

Warianty tytułu

EN

Effect of nano silica on freeze-thaw resistance of cement-fly ash mortars, cured in corrosive condition at different temperature

• Języki publikacji: PL EN

Abstrakty

PL

W Chinach buduje się dużą ilość wież betonowych na liniach do przesyłu bardzo wysokich napięć, z których wiele przecina zamarzające płaskowyże, a betonowy fundament wieży energetycznej narażony jest na zamarzanie i rozmrażanie, co zmniejsza jego wytrzymałość. W pracy badano zaprawy wykonane z cementu, popiołu lotnego i nanokrzemionki, które dojrzewały w roztworze siarczanów i chlorków przez 90 dni. Badano wytrzymałość, odporność na mróz, strukturę porów, strefę przejściową oraz wpływ dodatku nanokrzemionki na te właściwości. Wyniki badań pokazały, że dodatek nanokrzemionki poprawia odporność na mróz, a ten efekt można wyjaśnić poprawą struktury porów i zmniejszeniem porowatości strefy przejściowej z kruszywem. Przechowywanie betonu w roztworze agresywnym siarczanowo-chlorkowym ma niekorzystny wpływ na odporność na mróz, a powstawanie Aft, powodujące ekspansje może powodować powstawanie spękań betonu. Te wyniki uzasadniają ograniczenie wykonywania fundamentów betonowych wież do okresu letniego na zamarzających płaskowyżach, co zapewni ich lepsze właściwości.

EN

In China, a large amount of electric transmission towers has been built across plateau frozen soil, where the foundation concrete serves under freeze-thaw and erosion condition, and consequently, the durability faces the tough challenges. In this study, the mortars were prepared based on cement, fly ash, and nano silica [NS], which were cured in chloride-sulfate solution for 90 days. The compressive strength, freeze-thaw resistance, pore structure, interfacial transition zone, and hydration products was investigated, and the improvement in freeze-thaw resistance by addition of NS was discussed. The results show that addition of NS can improve the freeze-thaw resistance, and increase in curing temperature can also show improvement in freeze-thaw resistance. This effect can be explained by refine the pore structure and densify the microstructure of ITZ with the addition of NS. Furthermore, negative effect on freeze-thaw resistance can be found that being cured under chloride-sulfate condition, the formation of AFt would cause the volume expansion and cracking of concrete. Such results suggest that in the plateau frozen soil, it is better to cast concrete in summer, which would benefit the strength development of concrete and promote the freeze-thaw resistance.

Słowa kluczowe

PL

zamrażanie-odmrażanie; nanokrzemionka; popiół lotny; hydratacja; ekspansja

EN

freeze-thaw; nanosilica; fly ash; hydration; volume expansion

• Wydawca: Fundacja Cement, Wapno, Beton
• Czasopismo: Cement Wapno Beton
• Rocznik: 2019
• Tom: R. 22/84, nr 2
• Strony: 137--153
• Opis fizyczny: Bibliogr. 46 poz., il., tab.

Twórcy

autor

Zhang Yan

• China Electric Power Research Institute, Beijing, China

autor

Liu Huaqing

• China Electric Power Research Institute, Beijing, China

autor

Tong Ruiming

• China Electric Power Research Institute, Beijing, China

autor

Ren Jun

• China Electric Power Research Institute, Beijing, China
• State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, China

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).