Effects of recycled CRT glass fine aggregate size and content on mechanical and damping properties of concrete

This paper investigates the influences of the content and particle size of recycled cathode ray tube (CRT) glass on the damping ratio of the CRT glass concrete by free vibration attenuation method. The density, water absorption, strength, and elastic modulus were also evaluated. The results show that the water absorption, elastic modulus, compressive strength and tensile strength decreased monotonously with CRT glass content, while the CRT glass content had a limited impact on the damping ratio. In general, hardened density, water absorption and damping ratio would decrease when the maximum particle size reduces from 4.75 mm to 0.60 mm, while the compressive strength, tensile strength and elastic modulus would increase. However, an unexpected decrease in the compressive strength and increase in the damping ratio of CRT glass concrete comes out when the maximum particle size decreases from 1.18 mm to 0.60 mm. The tensile strength of CRT glass concrete is underestimated by most of the existing concrete specifications when using compressive strength to estimate tensile strength. These specifications provide a conservative estimation that allows for the safe application of recycled CRT glass concrete in engineering designs.