Akademik Veri Yönetim Sistemi
10th International Aegean Congress on Innovation Technologies & Engineering, İzmir, Türkiye, 5 - 07 Eylül 2024, cilt.1, sa.1, ss.352-363
As in the rest of the
world, the increase in population in our country has led to a rise in
multi-story buildings. In engineering applications, it is desired that
construction materials be as lightweight as possible. Due to their high thermal
and acoustic insulation properties, lightweight concretes are becoming
increasingly popular in the construction sector. Various aggregates and
additives are used to create lightweight concrete mixtures. Alongside natural
materials, clays that exhibit expansion properties due to thermal processing
are also utilized as aggregates. Additionally, waste materials such as silica
fume, fly ash, and blast furnace slag, which pose environmental problems, can
be added to the concrete mix to enhance its strength properties. This study
explores the potential of using expanded clay aggregate, an alternative
artificial aggregate, for lightweight building materials. Ankara/Akyurt clay
was expanded at temperatures of 1150 and 1200°C, with the best expansion ratio
of 6,2 achieved at 1200°C for 10 minutes. The bulk density of the Ankara-Akyurt
expanded clay aggregate was found to be 0,32 g/cm³. After the expansion
process, the feasibility of using the aggregate material in lightweight
construction materials with pumice obtained from the Kayseri/Tomarza region,
along with pozzolanic additives, was investigated. The 28-day bulk density,
uniaxial compressive strength, and ultrasonic pulse velocity of the prepared
lightweight concrete were measured. Pozzolans such as fly ash, silica fume, and
quartz sand were added to the lightweight concrete mixtures in proportions of
5%, 10%, 15%, and 20%. For mixtures containing pumice and expanded clay
aggregate with 15% silica fume as a pozzolan, the uniaxial compressive strength
was 125,12 kg/cm² (12.27 MPa). According to TS EN 206, this concrete falls into
the LC 12 / 13 lightweight concrete class. The insulation properties of the
Ankara-Akyurt expanded clay aggregate were also investigated, with an
ultrasonic pulse velocity of 2,28 km/s, which is below the 3,0 km/s threshold
for lightweight concrete as per TS 12504-4.