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For the concretes subjected to sulphate corrosion the use of the H II/A-S cement type is recommended. To improve the behaviour of these concretes to aggressive sulphate and magnesia corrosion, the use of the fly ash admixture collected by wet process for replacing the fine part of the aggregate is proposed. Because this type of corrosion is manifesting by expansion the analysis was conducted by measuring the dimensional modifications. In the Laboratory of the Faculty of Civil Engineering and Building Services of Iasi, an experimental program was conducted in order to assess the dimensional modification of the some samples prepared by concrete mixes based on belitic cements of type H II/A-S and embedding fly ash subjected to a combined sulphate and magnesia corrosion process using a mixed solution of Na2SO4 and MgSO4 having certain concentrations. The prismatic concrete samples were preserved in distilled water and in the combined solution, and then after 28 and 90 days their dimensions were measured by the Graff device. In this paper is presented the behaviour of the concretes in the first life time and, as further research other samples will be tested for longer time.

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