Studies on the reuse of waste printed circuit board as an additive for cement mortar.
The recent development in electronic industries has generated a drastic increase in production of printed circuit boards (PCB). Accordingly, the amount of waste PCB from electronic productions and waste electronics and its environmental impact such as soil and groundwater contamination have become a great concern. This study aims to propose a method for reuse of waste PCB as an additive for cement mortar. Although the expansibility of waste PCB powder finer than 0.08 mm in water was observed to be greater than 2.0%, the maximum expansion rates in water for 0.08 to approximately 0.15 and 0.15 to approximately 0.30 mm sized PCB powders were less than 2.0%, which satisfied the necessary condition as an alternative additive for cement mortar in place of sand. The difference in the compressive strength of standard mortar and waste PCB added mortar was observed to be less than 10% and their difference was expected to be smaller after prolonged aging. The durability of waste PCB added cement mortar was also examined through dry/wet conditioning cyclic tests and acidic/alkaline conditioning tests. From the tests, both weight and compressive strength of cement mortar were observed to be recovered with aging. The leaching test for heavy metals from waste PCB added mortar showed that no heavy metal ions such as copper, lead, or cadmium were detected in the leachate, which resulted from fixation effect of the cement hydrates.
Ban
Bong-Chan
BC
Department of Material Science and Metallurgical Engineering, Sunchon National University, Sunchon, Korea.
Song
Jong-Yoon
JY
Lim
Joong-Yeon
JY
Wang
Soo-Kyoon
SK
An
Kwang-Guk
KG
Kim
Dong-Su
DS
D002484:Cementation; D019245:Compressive Strength; D003247:Conservation of Natural Resources; D004581:Electronics; D007220:Industrial Waste; D019216:Metals, Heavy / Q000032:analysis; D010316:Particle Size; D018505:Waste Management / Q000379:methods*
D007220:Industrial Waste; D019216:Metals, Heavy