The disposal of hazardous waste cathode ray tubes (CRTs) has become a major environmental concern due to obsolescence of old monitors and their high lead content. Utilizing waste CRT glass to substitute river sand to fabricate eco-friendly ultra-high performance concrete (UHPC) is an appealing recycling and resource conservation option. The superior mechanical properties of eco-friendly UHPC at static loads suggest its potential application in key infrastructures. However, key infrastructures have a high risk of exposing to extreme loads, and the dynamic performance of eco-friendly UHPC under high strain rates is insufficient to withstand extreme loads, impeding its wide application. In this study, the environmental and economic implications of eco-friendly UHPC were evaluated by life cycle assessment and toxicity characteristic leaching procedure. The feasibility of using silane coupling agent (SCA) modified steel fibers to enhance dynamic performance of eco-friendly UHPC was investigated. Results show that recycling waste CRT glass through eco-friendly UHPC significantly reduces the energy consumption, CO₂ emissions, human toxicity potential and disposal cost. SCA modified steel fibers are effective in improving peak toughness and energy absorption capacity of eco-friendly UHPC, implying better resistance to dynamic loads. The behind mechanism is the steel fiber-matrix interfacial bond is enhanced by SCA, thus absorbing more energy and delaying interfacial debonding. SCA modification approach can improve the recovery efficiency of waste CRT glass and promote the environmental performance of UHPC. The findings contribute to direct recycling of waste CRT glass and conservation of natural resource with enormous environmental and economic benefits.

由于旧显示器的过时和其高铅含量，危险废物阴极射线管（CRT）的处置已成为主要的环境问题。利用CRT废玻璃代替河砂来制造环保的超高性能混凝土（UHPC）是一种有吸引力的回收和资源节约方案。环保UHPC在静态载荷下的优越机械性能表明其在关键基础设施中的潜在应用。但是，关键的基础设施极有可能承受极端负荷，而环保型UHPC在高应变率下的动态性能不足以承受极端负荷，从而阻碍了其广泛应用。在这项研究中，通过生命周期评估和毒性特征浸出程序评估了生态友好型超高分子量聚乙烯对环境和经济的影响。研究了使用硅烷偶联剂（SCA）改性钢纤维增强生态友好型UHPC的动态性能的可行性。结果表明，通过环保的UHPC回收废CRT玻璃可以显着降低能耗₂排放，人体潜在毒性和处置成本。SCA改性钢纤维可有效提高环保型UHPC的峰值韧性和能量吸收能力，这意味着对动态载荷的抵抗力更强。背后的机理是，SCA增强了钢纤维-基体的界面结合，从而吸收了更多的能量并延迟了界面的剥离。SCA改性方法可以提高废旧CRT玻璃的回收效率，并提高UHPC的环保性能。这些发现有助于废旧CRT玻璃的直接回收利用和自然资源的保护，具有巨大的环境和经济效益。