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Abstract. During the last decades, the concrete industry has been widely developing in many ways such as the methods of pouring concrete in order to achieve high quality concrete and low cost. Two-stage concrete is characterised by a higher proportion of coarse aggregate therefore the variation in aggregate content influences significantly its mechanical properties. The mechanical characteristics of the two-stage concrete (TSC) in failure conditions are dissimilar from the ordinary ones. Behaviour of TSC in compression has been well documented, but there are little published data on its behaviour in tension and modulus of elasticity. This paper presents the results of experimental testing of one type of coarse aggregate and three different mix proportions of grout. It was found that the modulus of elasticity and splitting tensile strength of two-stage concrete is equivalent or higher than that of conventional concrete at the same compressive strength.

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