Approach of an elevated criterion for frost resistance of concrete according to Estonian practice in concrete industryLiisma, EneliNordic Concrete Research : proceedings of XXIII Nordic Concrete Research Symposium : Aalborg, Denmark, 21-23 August, 20172017 / p. 153-156 : ill Damaging formula of the frost resistant concrete with poor quality of coarse limestone aggregateLiisma, Eneli; Raado, Lembi-MerikeJournal of civil engineering and architecture2015 / p. 598-603 : ill