Characterization of Spherical Waste CRT Glass as Aggregates in Concrete
Hazardous cathode ray tube (CRT) glass waste has been used to partially or totally replace natural aggregates in concrete. It is an effective and environmentally friendly method of recycling the increasing number of discarded CRT in the electronic industry. However, little research has been made on other recycling methods, in particular, melting and annealing operations. The typical way is by crushing the CRT funnel glass and grading it to size less than 4.75 mm. The crushing operations have caused the formation of micro-cracks in the glass, led to high concentration of lead leaching. Therefore, this study aimed to investigate the properties of spherical CRT glass (GS) as coarse aggregate in concrete, which was shaped using the techniques melting and annealing. The results demonstrated that the GS is a stronger coarse aggregate than crushed CRT glass (GC) and natural aggregate. The annealing technique has managed to reduce the internal pressure of the glass and strengthens the glass product i.e. GS. Other than that, GS shows the lowest value of specific gravity, unit weight, and percentage absorption. In addition, the use of different morphological features of CRT glass as aggregates are found to be beneficial to concrete strength. The combination of 60% GS and 40% GC has made the coarse aggregates consisting of different shapes and sizes produce a more compacted concrete structure, which significantly lower the percentage reduction of compressive strength between the CRT concrete and the conventional concrete, at only 8.9% loss. The properties of GS are seen as an important step towards hazardous waste CRT glass recycling as a sustainable construction material.
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