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Four different compositions of ultra-high performance concrete (UHPC) have been created for this study, while W/C ratio varied from 0.25 to 0.33. Amount of cement, quartz sand and super plasticizer has been maintained constant (at 735 kg/m 3 , 962 kg/m 3 and 36.76 l respectively). Glass powder and silica fume were used as binder. Optimal fineness of glass powder was selected by Chapelle test. In this study different combinations of silica fume, glass powder and quartz powder as microfiller were used. Compressive strength up to 160 MPa was obtained. The main aim of experiment was to create relationships between w/c ratio and compressive strength and to find optimal composition of UHPC. Test methods such as: slump, dynamic viscosity, density, and compressive strength were used. In experiment glass powder was successfully utilized in UHPC.

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Additive of glass powder was successfully utilized in ultra-high performance concrete (UHPC) mixture. During experiment was found, that glass powder can be used instead of silica fume (SF), without decrease of mechanical properties and microstructure can be significantly increased. In experiment 100 % of quartz powder was substituted by glass powder. Quantitative and qualitative XRD analysis revealed, that glass powder improves hydration of Portland cement and in such way additional compressive strength up to 40 MPa can be gained. Designed mixtures were blended with laboratory mixer Eirich R02T and later with industrial mixer HPGM 1125. In new UHPC mixture was incorporated different amount of steel fibres. Flexural strength was increased about 5 times from 6.7 MPa to 36.2 MPa.

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