Recycled CRT Funnel Glass as Coarse Aggregate and Fine Aggregate in the Radiation Protection Concrete

Abstract

In recent decades, high-tech electrical equipment has drastically proliferated instead of Cathode Ray Tube (CRT), making CRT funnel glass potential hazardous solid waste. Due to a relatively high level of lead, CRT funnel glass could be used as a potential material for the production of anti-radioactive concrete. In our study the CRT funnel glass , which was separated as aggregate in the concrete, was reduced to 4.75-25 mm (coarse aggregates) and less 4.75 mm (fine aggregates) in the production of anti-radioactive concrete. Mixes containing 0%, 20%, 40% , 60%, 80% and 100% (volume percentage) of CRT funnel glass to replace fine aggregate and coarse aggregate (respectively or simultaneously)) were prepared. The influence of the size, shape and replacement percentage of aggregates on workability, compressive strength and radiation shielding performance were determined. It was found that the replacement of natural aggregate with recycled CRT glass considerably improved the slump and radiation shielding performance but reduced compressive strength. The optimum percentage of waste funnel glass used as fine aggregate and coarse aggregate was 40%. The results clearly showed that the CRT funnel glass performed a significant enhancement in radiation shielding properties.

Impact of glass granular replacement as a coarse aggregate on the compressive strength of a concrete mixture; Normalaization and Modeling

“…Slump is one of these tests done for the concrete as an indication of the workability, based on the definition the water content in the mix composition will play an important role in affecting the slump value. As expressed in Figure 2 (Tian et al, 2016, Nassar and Soroushian., 2013, Gerges et al, 2018, Keryou et al, 2014, in concrete when part or all the aggregate will be replaced by waste glass which has the same gradation of the coarse aggregate the value of the slump will be affected and decrease compared to the control sample, because due to the high irregularity in the waste glass granular the void between particles will be filled with cement pastes which cause to the use of the all water content in the mix and decrease the slump value as in the Gerges et al, 2018, while in Tian et al, 2016 since part of the cement will be replaced by the pozzolanic material which reduces in the hydration reaction cause the increase in the water availability in the mix which cause the increase in the slump value. The most affected parameter on the density of concrete is the density of coarse aggregate, when the coarse aggregate is replaced by another material (Waste glass granular) with the same gradation of coarse aggregate but with lower density will decrease the density of concrete and the rate of decrease depending on the density of used waste glass (Nassar andSoroushian., 2013, Keryou et al, 2014)…”