Dubna Skala– Visnove, Slovakia
The D1 is a highway located in Slovakia which is a part of the transportation corridor nr. 5 belonging to the TEN (trans-European Network). The corridor 5 connects Ukraina to the Mediterranean sea arriving in Venice, in Rjeka through Zagreb and in Ploce through Sarajevo. The Slovakian part of the corridor 5 connects Ukraina to Vienna through Bratislava.
The tunnel is excavated in traditional system on 10 meter wide sections with double lining in shotcrete (class J2 and J3) and cast in situ secondary lining. The total amount of shotcrete for the jobsite is 200,000 m3 while cast in situ secondary lining is 170,000 m3 of concrete.
Due to geological condition – shotcrete is applied with both the strengths development classes J2 and J3, while for secondary lining concrete has been designed to reach 12 Mpa in 8 hours after casting.
For concrete and shotcrete production two batching plants are installed at the jobsite near the adits in Visnove and in Dubna Skala. Long open time (120 minutes) for shotcrete mixes was provided through the supply of Sika® ViscoCrete® SC 305 which is a PCE HRWR specially designed for shotcrete mixes with long slump life requirements, while the safe application in standard and difficult shotcreting operations was achieved with the use of Sigunit® L-5601 AF and Sigunit® L-53 AF. Secondary lining with fast strengths development was achieved with the use of Sika® ViscoCrete® 21.
Sika® Separol®-33 Universal
Sika® NB 1
Sika Elastomer FM 250
Sigunit® L-5601 AF
Sigunit® L-53 AF
Salini Impregilo / Duha