Page 53 - Abstract book - TJSSF-2020

Thailand – Japan Student Science Fair 2020 (TJ-SSF 2020)
“Seeding Innovations through Fostering Thailand – Japan Youth Friendship”

Efficiency of concrete materials made with waste foundry sand
treated with fungi

Nobtham Jirajarus , Phutanate Pisutsin , Sarunwich Juntramin
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Advisor: Pattaraya Klintong
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Mahidol Wittayanusorn School
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Abstract
Nowadays, solid waste is the critical problem in the world. Waste foundry sand (WFS) is one of the
most common waste generated by metal casting industries. Due to high cost and lack of land filling
space, Waste foundry sand is one such material which can be used as an alternative to natural sand in
concrete. This study aimed to evaluate the effects of fungal treated WFS on concrete properties. A total
of 10 fungi were isolate from area of Mahidol Wittayanusorn School. They were analyzed for acid
production. The result showed that isolate I9 was the best acid producer. The identification results found
that isolate I9 was belonged to genus Aspergillus by colony and morphological features. Fungal
inoculums (2%) were used for the treatment of WFS for 10 days. Fungal treated WFS and untreated
WFS were utilized for the production of concrete cubes (15x15x15 cm) mixtures with a substitution
rate of 0,10 and 20% by volume. The efficiency of concrete was evaluated through compressive strength
property. The test results showed that the compressive strength of the concrete made with fungal treated
and untreated WFS (10% and 20%) was relatively equal to the control concrete. Therefore, WFS with
a substitution rate of 20% can be effectively used as partial replacement of sand in concrete production,
however, concrete containing fungal (Aspergillus sp.) treated WFS (10% and 20%) didn’t show the
increase in compressive strength as compared to concrete made with untreated WFS. From the test
results, it is suggested that further studies are necessary to seek other appropriate fungal strains and
suitable conditions treatment for waste foundry sand.

Keywords: Waste foundry sand, Fungi, Concrete

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