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http://dx.doi.org/10.17576/jsm-2019-4811-24
Thermal Effect on
Mechanical Characteristics of Drinking Water Sludge Brick Incorporated with
Rice Husk Ash
(Kesan Suhu terhadap
Cirian Mekanik Bata Sisa Rawatan Air Campuran Abu Sekam Padi)
ZULFAHMI ALI RAHMAN*, NOR MAISALHAH MOHD SALEH, WAN MOHD RAZI IDRIS
& TUKIMAT LIHAN
Center for Earth
Sciences and Environment, Faculty of Science and Technology, Universiti
Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia
Diserahkan:
21 Mac 2019/Diterima: 15 Ogos 2019
ABSTRACT
Brick is among the
important construction materials and commonly manufactured from mixtures of
clay or sand, lime and cement. Due to limited natural resources for raw
materials and highly demand for brick in construction industry have gradually
increased the market price of each unit. Therefore, alternative sources are
required such utilization of drinking water sludge (DWS)
and rice husk ash (RHA) are potentially used as base
and/or incorporated materials for manufacturing alternative brick. In this
study, the brick samples which had been developed from mixtures of DWS and RHA (D80 brick) were subjected to different firing temperatures of
300oC and 500oC. The results of this study
were compared to that of unfired brick and bricks which developed from 100% DWS content
(D100 brick). The result also shows the volume shrinkage significantly
increased at firing temperature of 500oC and was more apparently
affected the D100 brick if compared to that of D80 brick. As firing
temperatures were increased, the density of both brick samples decreased with
D100 brick more prominent than D80 brick. The effect of temperature on the
water absorption and compressive strength clearly increased especially for the
D80 bricks, respectively. The effect of temperature is closely related to the
presence of rice husk ash as this organic matter destroyed at high firing
temperature of 500oC. The results obtained in this study
suggested that firing temperature can modify and enhance the studied mechanical
characteristics.
Keywords: Brick;
compressive strength; shrinkage; sludge; temperature
ABSTRAK
Bata adalah antara
bahan binaan yang penting dan sering dihasilkan daripada campuran liat atau
pasir, kapur dan simen. Akibat daripada terhadnya sumber semula jadi sebagai
bahan mentah dan permintaan yang tinggi bagi bata di dalam industri pembinaan
menyebabkan peningkatan harga pasaran setiap unit bata. Oleh itu, sumber
alternatif diperlukan seperti penggunaan sisa perawatan air minuman (DWS)
dan abu sekam padi (RHA) adalah berpotensi digunakan
sebagai asas dan/atau bahan tambahan bagi penghasilan bata alternatif tersebut.
Kajian ini menggunakan sampel bata yang dihasilkan daripada campuran DWS dan RHA (D80) telah dibakar pada suhu 300oC
dan 500oC. Hasil kajian ini dibandingkan dengan bata tanpa bakar
dan bata yang dihasilkan daripada 100% kandungan DWS (D100).
Hasil kajian juga menunjukkan pengecutan isi padu meningkat dengan suhu bakaran
500ºC dan kesannya lebih ketara terhadap bata D100 berbanding bata D80. Kesan
suhu terhadap penyerap air dan kekuatan mampatan masing-masing jelas meningkat
bagi bata D80. Kesan suhu sangat berkait terhadap kehadiran abu sekam padi
memandangkan bahan organik ini musnah pada suhu yang tinggi 500oC.
Hasil daripada kajian ini mencadangkan bahawa suhu bakaran boleh mengubah suai
dan meningkatkan cirian mekanik yang dikaji.
Kata kunci: Bata;
kekuatan mampatan; pengecutan; sisa; suhu
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*Pengarang untuk surat-menyurat; email: zarah1970@ukm.edu.my
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