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New fresh concrete chemical admixture for tunnel lining design in the extreme winter conditions

Novi hemijski dodatak svežem betonu za izvođenje tunelske obloge u ekstremnim zimskim uslovima

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2014
167.pdf (1.640Mb)
Authors
Kostić, Srđan
Vasović, Dejan
Okrajnov-Bajić, Ruža
Article (Published version)
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Abstract
A new type of calcium-nitrate and urea-based chemical admixture is proposed, in order to maintain the compressive strength of fresh concrete exposed to very low temperatures (below to - 250C), including a sudden transition to positive temperatures at an early age. The applied admixture has no negative effect on compressive strength of specimens cured in water at 200C. When it is cured under three different frost regimes, concrete specimens with admixture show over three times higher compressive strength, in comparison to specimens without admixture. The implications of such improved concrete composition are discussed in reference to the tunnel lining design.
U radu se predlaže novi tip hemijskog dodatka betonu na bazi kalcijum-nitrata i uree, sa ciljem održavanja čvrstoće na pritisak svežeg betona izloženog vrlo niskim temperaturama (do -250C), uključujući i uticaj iznenadnih velikih temperaturnih amplituda (prelaze od negativnih ka pozitivnim temperaturama). Primenjeni dodatak ne utiče nepovoljno na čvrstoću na pritisak uzoraka betona negovanih u izotermalnim uslovima na temperaturi od 200C. Kada se svež beton izloži uticaju različitih režima mraza, uzorci sa dodatkom pokazuju gotovo tri puta veću pritisnu čvrstoću u poređenju sa uzorcima bez dodatka. Primena betona sa predloženim aditivom u praksi razmatra se u odnosu na postojanost i stabilnost tunelske obloge sa prskanim betonom.
Keywords:
frost protection / compressive strength / anti-freezing admixture / tunnel lining / zaštita od mraza / čvrstoća na pritisak / dodatak protiv zamrzavanja / obloga tunela
Source:
Mining and Metallurgy Engineering Bor, 2014, 2, 13-32
Publisher:
  • Institut za rudarstvo i metalurgiju, Bor
Projects:
  • Magmatism and geodynamics of the Balkan Peninsula from Mesozoic to present day: significance for the formation of metallic and non-metallic mineral deposits (RS-176016)

DOI: 10.5937/mmeb1402013k

ISSN: 2334-8836

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URI
http://raf.arh.bg.ac.rs/handle/123456789/169
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  • Publikacije istraživača / Researchers' publications
Institution
Arhitektonski fakultet

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