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

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 negati...

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Bibliographic Details
Published in:Mining and Metallurgy Engineering Bor (Online) 2014-01, Vol.2014 (2), p.13-32
Main Authors: Kostić Srđan, Vasović Dejan, Okrajnov-Bajić Ruža
Format: Article
Language:English
Subjects:
anti-freezing admixture
compressive strength
frost protection
tunnel lining
Online Access:Get full text
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Summary: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.
ISSN:2334-8836
2406-1395
DOI:10.5937/mmeb1402013k