2019, Vol. 6, No. 3. - go to content...

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DOI: 10.15862/27SATS319 (https://doi.org/10.15862/27SATS319)

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Eroshkina N.A., Chamurliev M.Yu., Korovkin M.O. Sulfuric acid corrosion of geopolymer concrete with mineral additives from wastes. Russian Journal of Transport Engineering. 2019; 6(3). Available at: https://t-s.today/PDF/27SATS319.pdf (in Russian). DOI: 10.15862/27SATS319

Sulfuric acid corrosion of geopolymer concrete with mineral additives from wastes

Eroshkina Nadezhda Alexandrovna
Penza state university of architecture and construction, Penza, Russia
E-mail: n_eroshkina@mail.ru

Chamurliev Mikhail Yurievich
Penza state university of architecture and construction, Penza, Russia
E-mail: super.mikami@yandex.ru

Korovkin Mark Olimpievich
Penza state university of architecture and construction, Penza, Russia
E-mail: m_korovkin@mail.ru

Abstract. The effect of mineral additives such as crushed ash and individual building demolition waste on the corrosion resistance of geopolymer concrete based on screening the crushed granite and blast furnace slag in an environment of sulfuric acid solutions was studied. The corrosion resistance of concrete was evaluated by the kinetics of reducing the mass and strength of samples in sulfuric acid solutions with a concentration of 2,5 and 5 % for 10 days. It was shown that replacing 50 % of granite powder with ground crushed bricks or ash significantly increases the corrosion resistance of geopolymer materials. It was established that due to the formation of poorly soluble products of the interaction of sulfuric acid and concrete in the pores of a geopolymer stone, an interface is formed between the undestructed material and the zone subjected to destructive processes, which impedes the penetration of the corrosive medium into the material. The study also conducted comparative studies of the corrosion resistance of Portland cement concrete with various water-cement ratios. The research results showed that under the influence of sulfuric acid in Portland cement concrete this border does not form and a rapid loss of mass and strength occurs in the samples. The established feature of the process of destruction of geopolymer concrete in a solution of sulfuric acid is the reason for its higher resistance in comparison with cement concrete.

Keywords: geopolymer; sulfuric acid corrosion; corrosion mechanism; screening of granite crushing; slag; fly ash; concrete scrap; crushed bricks; Portland cement

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