Akademik Veri Yönetim Sistemi
The First International Cement Based Composites CEBACOM-2022, Erzurum, Türkiye, 29 - 30 Haziran 2022, cilt.1, sa.1, ss.89-95
Mechanical analyzes were carried out on the recycled concrete samples
obtained by preparing different mixtures of geopolymer powder,
metakaolin, aggregates and alkali activator as sodium silicate (Na2SO3)
and sodium hydroxide (NaOH) solution, which were formed by grinding
the geopolymer concrete samples prepared with certain temperature and
low curing times. In order to determine the contribution of metakaolin
and ground geopolymer powders to the mechanical properties of
geopolymer concrete, three different mixtures were prepared. In the
three mixtures, ground geopolymer powder of 33.8%, 29.6% and 25.4% by
volume, respectively, was used. In addition, metakaolin was used in
the three mixtures at a rate of 0%, 4.2% and 8.4% by volume,
respectively. The mixtures formed were kept in a curing environment at
45 and 75 ℃ for 8 hour, and mechanical properties (flexural and
compressive strength), capillary water absorption and dry unit weights
were determined by performing some experiments. The test results showed
that the highest compressive strength of the mixture in the curing
environment at 75 degrees was 46.3 MPa. The test results showed that
the lowest capillary water absorption (0.7 kg/m2) was in the mixtures
with the highest metakaolin content. In addition, it was shown that
the highest dry unit weight (2354 kg/m3) was obtained in the mixture
with the highest metakaolin content kept at 45 ℃. At the end of the
study, it has been suggested that recycled geopolymer powders and
metakaolin can be used together to make high strength concrete without
consuming too much natural resources and energy.