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2 2022

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Production and characterization of natural clay‑free green building brick materials using water treatment sludge and oak wood ash

Harja Maria, Gencel Osman, Sari Ahmet, Sutcu Mucahit, Erdogmus Ertugrul, Hekimoglu Gokhan

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 2

art. no. e79, 1--14

The experimental study investigates the feasibility of using two extensively waste (wastewater treatment sludge and oak wood ash) as raw materials in the manufacture of clay-free bricks. The wastes were characterized by particle-size distribution, chemical composition (EDX), X-ray diffraction (XRD), thermal analysis, and scanning electron microscopy (SEM). The oak wood ash replaced the water treatment sludge in different amounts (10-30 wt.%) in brick manufacture. The properties of clay-free green building brick were compared with the conventional bricks (obtained by standard methods). The properties depended of waste proportion. The 30 wt.% oak wood ash content achieved increase apparent porosity, with direct effect over water absorption and decreasing compressive strength. By replacing the water treatment sludge with oak wood ash, the CaO content increased, with negative effect over efflorescence on the surface; however, for 30 wt.% oak wood ash is below the imposed limits. Amounts of heavy metals in the leachates of fired samples are observed below the specified limits of the EPA (Environment Protection Authority). Additionally, the clay-free green bricks showed properties similar to the commercial bricks and improved thermal conductivity. The bricks containing 80 wt.% wastewater treatment sludge and 20 wt.% oak wood ash fulfilled standard requirements for clay masonry materials.

Manufacturing of fred bricks derived from wastes: utilization of water treatment sludge and concrete demolition waste

Gencel Osman, Kizinievic Olga, Erdogmus Ertugrul, Kizinievic Viktor, Sutcu Mucahit, Munoz Pedro

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 2

art. no. e78, 1--16

The treatment of wastewater certainly contributes to reduce water pollution on environment, but it also generates large amounts of water treatment sludge (WTS) which must be further treated to reduce potential health risks and environmental impacts. However, from a circular economy approach, WTS should be considered as a byproduct which can replace natural raw materials for construction industry. Moreover, this sector is urged to reduce its CO2 footprint which is mainly produced by the embodied impact of construction materials during the initial and final phase, in a life cycle assessment perspective. For these reasons, this paper assesses WTS for replacing natural clay in brick industry and it also evaluates the impact of adding concrete waste (CW) to the blend for improving technological properties of the so-made bricks. Thus, bricks containing sludge and CW (i.e. from 0 to 20%) have been successfully manufactured by firing at 1000°C and tested. It was observed that water absorption and apparent porosity values increase while bulk density, compressive strength and thermal conductivity values decrease by depending on the increment in CW content. The bulk density of the fired bricks having 5-20 wt% CW content ranged from 1.72 to 2.10 g/cm3 , compressive strength ranged from 8.9 to 20.2 MPa, water absorption from 7.9 to 17.5% and thermal conductivity from 0.889 to 0.659 W/m K. Because of these reasons, it is concluded that this novel brick made by WTS and CW can be properly manufactured at industrial scale, shows good performance and reduces environmental issues of both brick industry and water treatment plants.