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Engineering Properties of Alkali Activated Materials Produced from Thu Duc Water Plant Waste Sludge, Fly Ash, and Alkaline Activator by Semi-dry Pressing Method

Nguyen Hoc Thang, Dang Thanh Phong, Pham Minh Tan, Le Van Quang


Alkali activated material is a product manufactured to serve the needs of construction. The
production of alkali activated material has many advantages compared to other traditional baked
materials. The product is not heated at high temperature, so it saves energy and reduces the amount
of waste impacting negatively to ecology system and human life. The raw materials for production of
alkali activated materials are re-used from other industrial solid wastes such as fly ash, bottom ash,
blast furnace slag, red mud, and others. The alkali activated materials are formed in many different
methods such as pouring the fresh mortar paste into the mould or press the powder mixtures at high
pressure. In addition, the raw materials are mixed with the binders to increase the mechanical
strength of the product. This study produced the alkali activated material using industrial solid wastes
such as waste sludge from Thu Duc water plant, Ho Chi Minh City and fly ash from Vinh Tan coalfired
thermal power plant, Binh Thuan province as raw materials. The raw materials were prepared
and mixed with alkaline activator and pressed at 25 kN pressure to form the bricks. The products of
unburnt brick have engineering properties meet the requirements of unburnt construction bricks in the


Alkali activated material, engineering properties, fly ash, pollution, water plant waste sludge

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