Abstract:The recycled cathode ray tube (CRT) funnel glass was used as replacement of magnetite sand in the concrete, and its mass replacement rates were 0, 20%, 40% and 60%, respectively. The flowability, apparent density and mechanical properties of the radiation shielding concrete were investigated, while its γ-ray radiation shielding parameters such as linear and mass attenuation coefficients (μ and μ_m, respectively), thickness values of half-value layer (h_HVL) and tenth-value layer (h_TVL) were obtained by theoretical calculation, experiment and Monte-Carlo N-Particle (MCNP) simulation code. The experimental results show that the flowability of the concrete increases significantly, whilst its apparent density, compressive strength and static elastic modulus decrease slightly. The calculated, simulated and experimental μ_m, μ, h_HVL and h_TVL values of all concrete samples are very consistent at the same γ-ray photon energy, and it is feasible to use MCNP code to simulate γ-ray radiation shielding parameters of materials. The calculated results show that in a wide range of γ-ray photon energy, the μ_m value of the concrete with CRT funnel glass replacing magnetite sand is improved effectively, and its radiation shielding performances are the same as those of the control concrete (M-1). By comprehensively comparing the flowability, mechanical properties and γ-ray radiation shielding properties, the concrete samples with 20%-40% funnel glass as fine aggregate have good performances.

Key words: cathode ray tube; funnel glass; concrete; γ-ray; radiation shielding; mechanical properties; Monte-Carlo N-Particle simulation