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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
(Institut za rudarstvo i metalurgiju, Bor, 2014)
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 ...