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"Suorahankinta perustuu hankintalain 40 - 41 \u00a7:iin. ",
"",
"Vahanen Rakennusfysiikka Oy on perehtynyt jo useiden vuosien ajan siltojen betonikansien ja rakennusten betonirakenteiden kosteudenmittauksiin sek\u00e4 absoluuttisen- ett\u00e4 suhteellisen kosteuden mittausmenetelmill\u00e4.",
"",
"Nyky\u00e4\u00e4n siltakansilla betonin kosteuspitoisuus mitataan ennen tiivistysaineen tai vedeneristysten asennusta absoluuttisen kosteudenmittausmenetelm\u00e4ll\u00e4 (VTT 2650-17).",
"",
"Silloilla tekemiss\u00e4 tutkimuksissa on kosteusmittausmenetelm\u00e4n\u00e4 k\u00e4ytetty n\u00e4ytepalamittausmenetelm\u00e4\u00e4, joka ei ole riippuvainen mittausolosuhteista.",
"",
"Sami Niemi, Vahanen Rakennusfysiikka Oy, on ollut laatimassa RT-ohjekorttia RT 14-10984 sek\u00e4 muutenkin ollut aktiivisesti mukana kosteusmittausohjeiden kehitt\u00e4misess\u00e4 talonrakennuspuolella.",
"",
"Betonin eri kosteusmittausmenetelmien k\u00e4ytt\u00f6\u00e4 siltakansilla on tutkittu Jarmo Julkun DI-ty\u00f6ss\u00e4 (2016, Betonisen siltakannen epoksitiivistyksen laadunhallinta) sek\u00e4 kentt\u00e4tutkimuksissa vuonna 2018 (Tutkimusselostus, Rautatie- ja maantiesiltakansien kosteusmittauksien tutkiminen, vertailu ja kehitt\u00e4minen, 5.7.2018, Vahanen Rakennusfysiikka Oy). ",
"",
"Ty\u00f6n tavoitteena on:",
"\u00b7 Vertailla lis\u00e4\u00e4 eri kosteusmittausmenetelmi\u00e4: painoprosenttikosteusmit-tausmenetelm\u00e4 (VTT 2650-17) ja suhteellisen kosteuden mittaus (RT14-10984 v.2010)",
"\u00b7 Tarkastella edellisess\u00e4 tutkimuksessa (Tutkimusselostus 5.7.2018) suhteellisen kosteudenmittausmenetelm\u00e4lle ehdotettujen mittaussyvyyksien (rakenteen pinta 0-10 mm sek\u00e4 pintaosa 30 mm) riitt\u00e4vyytt\u00e4 kosteuspitoisuuksien arvioimiseksi ennen tiivistysaineen asentamista.",
"o Tarkentaa kosteusmittaussyvyydet ja tavoitekosteusarvot suhteellisen",
"kosteuden mittauksille.",
"\u00b7 Tarkastella eri tasaantumisl\u00e4mp\u00f6tilojen vaikutusta kosteusmittausn\u00e4ytteist\u00e4 otettavien suhteellisen kosteuden arvoihin.",
"\u00b7 Arvioida tutkittavien siltakansien kuivumista kohteisiin asennettavien olo-suhdemittalaitteiden avulla.",
"",
"Palvelusta saatava hy\u00f6ty kohdistuu hankintayksik\u00f6n lis\u00e4ksi siltojen korjaus- ja rakentamisurakoitsijoiden sek\u00e4 vedeneristysurakoitsijoiden hy\u00f6dyksi ja toiminnassa k\u00e4ytett\u00e4v\u00e4ksi. Hy\u00f6tyj\u00e4 on mm.:",
"\u2022\tvaihtoehtoinen tapa mitata siltakansien kosteutta",
"\u2022\talustavien tutkimusten mukaisesti suhteellisen kosteuden mittaus on tarkempi mittausmenetelm\u00e4 kuin absoluuttisen kosteuden mittaus",
"\u2022\ttarkemmilla mittauksilla ja mittaustuloksilla siltakansien mahdollista kuplimisongelmaa voidaan v\u00e4hent\u00e4\u00e4",
"\u2022\tsuhteellisen kosteuden mittaushenkil\u00f6it\u00e4 on koulutettu paljon.",
"",
"V\u00e4yl\u00e4virasto haluaa selvitt\u00e4\u00e4 kattavammilla tutkimuksilla suhteellisen kos-teusmittausmenetelm\u00e4n ottamista vaihtoehtoiseksi kosteusmittausmenetelm\u00e4ksi siltakansilla.",
"",
"Koska Vahanen Rakennusfysiikka Oy on tehnyt jo alustavaa tutkimusty\u00f6t\u00e4 siltakansien kosteudenmittausmenetelmist\u00e4, on luontevaa jatkaa tutkimusta Vahanen Rakennusfysiikka Oy:n kanssa. ",
""
]
}
},
"departmentId": "92f02d60-8628-4fd3-9116-08d7af8a4be8",
"isPrivateSmallValueProcurement": false,
"dateCreated": "2020-02-28T08:24:25.9160079",
"dateModified": "2020-03-10T08:16:05.0475785"
}