Fabrication of Lightweight Aggregates from FRP Waste
Lightweight aggregates were prepared from ground FRP waste, which had been decomposed in N2 gas or air, mixed with clay as a binder and CaCO3 as a foaming agent, and fired at temperatures between 800°C and 950°C in air. The fabrication of the lightweight
aggregates was found to depend on the amount of char, CaCO3, and the firing temperature. At all temperatures, the samples prepared from the FRP waste that had been decomposed in N2 gas did not yield pore structure required for lightweight aggregates due to a relatively
large amount of char. However, the sample containing a small amount of char prepared from the FRP waste that had been decomposed in air showed well-developed closed pores at 900°C and 950°C. The addition of 5 wt% CaCO3 resulted in the most uniform pore structure. As the
amount of CaCO3 or the firing temperature was increased, the pore size and its distribution became larger and broadened.