Engineering Properties of Mortars Incorporating Recycled Fibers from Waste Printed Circuit Boards

DOI: 10.14416/


  • Dhitivajra Siriwattanasanon Department of Civil Engineering, Faculty of Engineering, Thammasat University
  • Burachat Chatveera Department of Civil Engineering, Faculty of Engineering, Thammasat University
  • Gritsada Sua-iam Department of Civil Engineering, Faculty of Engineering, Rajamangala University of Technology Phra Nakhon
  • Nirat Yamoat Department of Civil and Environmental Engineering Technology, College of Industrial Technology, King Mongkut’s University of Technology North Bangkok


Mortars, Recycled fiber, Waste printed circuit board, Engineering properties, Thermal conductivity


The purpose of this research was to investigate the engineering properties of mortar incorporating recycled fibers from waste-printed circuit boards used as admixtures at varying ratios. The study examined the chemical composition and physical characteristics of the fibers, including particle size gradation, shape, and surface properties, using scanning electron microscopy. Additionally, the study evaluated the fresh and hardened properties of the mortar, such as initial flow, setting time, compressive strength, flexural strength, thermal properties, and heavy metal concentration. The results showed that the majority of recycled fibers from waste electronic circuit boards were cylindrical rods with a diameter of approximately 12-15 mm and lengths ranging from 30 to 200 mm. As the number of recycled fibers from waste printed circuit boards increased in the mortar, the initial flow and setting time increased, while the compressive strength, flexural strength, and thermal conductivity coefficient decreased. Mortars containing 20% recycled fibers from waste electronic circuit boards exhibited the highest compressive strength and flexural strength of 36.35 MPa and 15.66 MPa, respectively, after 28 days. Furthermore, the concentration of heavy metals in the mortar was within the standard specified by the National Environmental Board's notification.


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บทความวิจัย (Research article)