Sains Malaysiana 48(11)(2019): 2541–2549

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

Received: 21 March 2019/Accepted: 15 August 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 300°C and 500°C. 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 500°C 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 500°C. 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 300°C dan 500°C. 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 500°C 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 500°C. 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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*Corresponding author; email: zarah1970@ukm.edu.my