![]() The largest decrease in compressive strength of concrete samples was recorded for samples with 50% substitutes of cement additives. Additives used in the laboratory tests significantly affect the compressive strength. compressive strength, water absorption and capillarity. The aim of the study was to identify the effect of the addition of chalcedonite dust and / or glass meal on the parameters of hardened concrete, i.e. Concrete mixes were prepared with a constant rate w / s = 0.4. The study used Portland cement CEM I 42.5R. The amount of aggregate was left unchanged. Additives were used to replace cement in concrete mixes in an amount of 15% and 25%. This particle size is present in 60% - 90% of the sample. Glass meal used in the study is a material with very fine grain size, less than 65μm. The main ingredient of chalcedonite dust is silica. Mineral dust is a waste product obtained from crushed aggregate mining, with grain size below 0,063μm. The scheduled program of laboratory tests included preparation of six batches of concrete mixtures with addition of glass meal and / or chalcedonite dust. ![]() By their application, the use of cement and production costs may be reduced. Additives used for production of concrete mixtures affect the rheological properties and parameters of hardened concrete, including compressive strength, water resistance, durability and shrinkage of hardened concrete.
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