Kazakhstan bans use of Omsk refinery's bitumen in road construction

    Kazakhstan has banned the use of bitumen produced by the Omsk Oil Refinery (in Russia near the Kazakhstan border) for the construction of roads, Tengrinews.kz reports, citing the Ministry of Transport and Communications.     “KazDorNII (Kazakhstan Road R&D Institute) has made tests of the asphalt-concrete samples of bitumen of the major manufacturers...