Utilizing recycled cathode ray tube funnel glass sand as river sand replacement in the high-density concrete

The rapid advance in the electronics industry has led to the disposal problem related to the cathode ray tube (CRT) glass waste. In this study, the Ordinary Portland cement (OPC) of 15% was replaced by fly ash to mitigate the potential of alkali–silica reaction (ASR) expansion, the crushed nitric acid-treated CRT funnel glass sand (TCF) was used to replace river sand fine aggregate of 0%, 25%, 50%, 75% in the high-density concrete. The fresh, mechanical properties of the high-density concrete containing TCF glass sand were studied, the alkali–silica reaction (ASR) of the mortar and drying shrinkage of the concrete were also evaluated. The test results showed that the use of TCF glass sand improved the fresh properties of the concrete, but reduced the mechanical properties of the concrete. Furthermore, at the drying period of 56 days, all concrete mixtures had an acceptable drying shrinkage value below 0.075%. ASR expansion values of the mortar with TCF glass sand were found to be below the limit of 0.1% at tested age of 14 days. Preliminary results obtained from this study had demonstrated that the CRT funnel glass (an original hazardous material) can be treated, processed and reutilized for the production of the high-density concrete.