ABSTRACT Recently, interest in the use of solid residues to partially replace some of the concrete components has grown. In this regard, this work evaluated the effect of surface treatment of post-consumer polypropylene flakes (as partial sand replacement by 10% volume) with surfactant in order to promote a better interaction with the cementitious mass and to improve its mechanical properties and durability. PP samples were treated with two different surfactants TS1 (nonionic) and TS2 (common detergent) (evaluating content and time). PP flakes with and without treatment were characterized by contact angle test, and the concrete samples were characterized by mechanical and durability tests. Results of the contact angle analysis showed that PP with TS2 presented greater wettability with increasing surfactant concentration and sample immersion time (0.2% and 20 s). The samples with the addition of treated PP showed an increase of 16% in the compressive strength and of 8.9% in stiffness and a decrease of 24% in the void index and of 44.9% in the water absorption, when compared to the untreated samples. Results showed that the treatment with the TS2 surfactant contributed to the improvement of the analysed properties. Graphical Abstract

中文翻译：

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消费后PP作为砂的部分替代品：表面处理PP与表面活性剂对混凝土性能的影响

摘要 最近，人们对使用固体残留物部分替代某些混凝土部件的兴趣日益浓厚。在这方面，这项工作评估了用表面活性剂对消费后的聚丙烯薄片（作为部分砂替代 10% 体积）进行表面处理的效果，以促进与胶结物质更好的相互作用并提高其机械性能和耐久性。PP 样品用两种不同的表面活性剂 TS1（非离子）和 TS2（普通洗涤剂）（评估含量和时间）处理。处理和未处理的 PP 薄片通过接触角测试进行表征，混凝土样品通过机械和耐久性测试进行表征。接触角分析结果表明，随着表面活性剂浓度和样品浸泡时间（0.2% 和 20 秒）的增加，含有 TS2 的 PP 表现出更大的润湿性。与未处理的样品相比，添加处理过的 PP 的样品的抗压强度增加了 16%，刚度增加了 8.9%，空隙指数减少了 24%，吸水率减少了 44.9%。结果表明，用 TS2 表面活性剂处理有助于改善所分析的性能。图形概要 结果表明，用 TS2 表面活性剂处理有助于改善所分析的性能。图形概要 结果表明，用 TS2 表面活性剂处理有助于改善所分析的性能。图形概要