Surface modification stands out as a promising solution for augmenting interface bonding of cement-based materials incorporating recycled plastic waste as a substitution for natural aggregates. In this work, plasma treatment was employed for surface modification, and the compressive strength of fabricated mortar with plasma-treated PET particles was improved by approximately 9% after a 28-day curing. Atomistic simulations of pull-out behavior for hybrid PET/C–S–H models have revealed that functional groups introduced on the PET surface can mainly influence PET viscoelasticity during interface failure. Hydroxyl groups primarily increase force for interface failure, whereas carboxyl and formyl groups bolster energy dissipation by rendering PET more resistant to plastic deformation. Especially, the carboxyl group exhibits the most pronounced enhancement effect, characterized by a low strain softening coefficient but a high hardening coefficient. The estimated quantitative impact of functional group types from our multiscale analysis provides a foundation for optimizing parameters in PET surface modification.

中文翻译：

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通过等离子体处理的 PET 骨料提高水泥基复合材料的抗压强度：深入了解界面力学

表面改性是一种很有前途的解决方案，可增强水泥基材料的界面粘合，其中掺入回收塑料废物作为天然骨料的替代品。在这项工作中，采用等离子体处理进行表面改性，经过等离子体处理的PET颗粒制备的砂浆在固化28天后，其抗压强度提高了约9%。对混合 PET/C-S-H 模型拉拔行为的原子模拟表明，PET 表面引入的官能团主要影响界面失效期间 PET 的粘弹性。羟基主要增加界面破坏的力，而羧基和甲酰基则通过使 PET 更能抵抗塑性变形来增强能量耗散。尤其是羧基表现出最显着的增强作用，其特点是应变软化系数低，但硬化系数高。我们的多尺度分析中估计的官能团类型的定量影响为优化 PET 表面改性参数奠定了基础。