Abstract: 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. By their application, the use of cement and
production costs may be reduced. The scheduled program of laboratory tests included
preparation of six batches of concrete mixtures with addition of glass meal and / or
chalcedonite dust. Mineral dust is a waste product obtained from crushed aggregate mining,
with grain size below 0,063μm. The main ingredient of chalcedonite dust is silica. Glass meal
used in the study is a material with very fine grain size, less than 65μm. This particle size is
present in 60% - 90% of the sample. Additives were used to replace cement in concrete mixes
in an amount of 15% and 25%. The amount of aggregate was left unchanged. The study used
Portland cement CEM I 42.5R. Concrete mixes were prepared with a constant rate w / s = 0.4.
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. compressive strength, water absorption
and capillarity. Additives used in the laboratory tests significantly affect the compressive
strength. The largest decrease in compressive strength of concrete samples was recorded for
samples with 50% substitutes of cement additives. This decrease is 34.35%. The smallest
decrease in compressive strength was noted in concrete with the addition of 15% of
chalcedonite dust or 15% glass meal, it amounts to an average of 15%. The study of absorption
shows that all concrete with the addition of chalcedonite dust and glass meal gained a
percentage weight increase between 2.7 ÷ 3.1% for the test batches. This is a very good result,
which is probably due to grout sealing. In capillary action for the test batches, the percentage
weight gains of samples ranges from 4.6% to 5.1%. However, the reference concrete obtained
the lowest water absorption as compared to other batches
DOI 
Web of Science