Tests on prism out of ultra-high-performance fiber reinforced concrete (UHPFRC) were performed in order to further clear up the size effect, i.e. the strength decrease with increasing depth for axial tension and flexure as well as for combined bending and axial forces. Further aim was to investigate the influence of the prism shape, i.e. the width to height ratio b/h. The tests were carried out with Ductal? from Lafarge with an average compressive strength of fcyl,m = 211 MPa as well as with Duracrete Plus from Schwenk Zement with fcyl,m = 169 MPa. For axial tension the elastic limits as well as the maximum tensile stresses exhibited a clear decrease with increasing depth from 25 to 100 mm. These values also decreased with increasing ratio b/h from 1 to 3 and 5 of the prisms. For pure bending of prisms from h = 25 to 150 mm the elastic limits as well as the maximum bending stresses (the bending tensile strengths) decreased with increasing depths. The width to height ratio b/h had no influence on the elastic limit of the flexural tensile stress but the bending tensile strengths decreased with increasing ratio b/h from 1 to 5
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