Akademik Veri Yönetim Sistemi
International Conference on Engineering, Natural Sciences, and Technological Developments (ICENSTED 2024), Balıkesir, Türkiye, 19 - 21 Temmuz 2024, ss.989-995
The aim of this study is to comprehensively
experimentally investigate the acid and sulfate resistance of concrete produced
using recycled aggregates. For this purpose, recycled aggregates at the ratios
of 0%, 10%, 25% and 50% by volume were used as fine and coarse aggregates in
concrete production instead of natural aggregates. In order to determine the
acid and sulfate resistance of concrete, the samples were kept in 5% H2SO4
and Na2SO4 solutions for 7 and 28 days, and then weight
loss, compressive strength loss and visual evaluations were made. In addition,
comparisons were made by not using recycled aggregate in control concretes. The highest
weight losses as a result of acid attack were obtained in concrete produced
using 50% recycled aggregate. While the compressive strength loss of the
control concrete after 7 days (C/7) acid attack was 4.17%, this loss in the 50%
recycled aggregate concrete (RA50/7) increased approximately 8 times and became
35.74%. As the acid exposure duration increased from 7 days to 28 days,
compressive strength losses occurred at higher levels in all groups. There was
no weight loss in all concretes after sulfate attack, instead there was a
slight increase in weight. As the recycled aggregate ratio and the number
of days increased, the compressive strength losses experienced by concretes
after sulfate attack also increased. The damage conditions obtained as a
result of visual evaluation of concrete with 50% recycled aggregate after acid
attack and sulfate attack were parallel to other results. As a result
of comprehensive experimental studies, it has been determined that the sulfate
resistance of concrete produced with recycled aggregates is better than acid.