Crumb rubber concrete (CRC), a type of eco-friendly concrete materials, has attracted pronounced interest in the field of infrastructure construction and waste management. However, special attention should be paid to its permeability since it is an important indicator to determine its service life for building structures, especially in coastal regions. Present study discusses the feasibility of pozzolanic fillers to improve the ductility and impermeability of CRC. By incorporating fly ash (FA), silica fume (SF), and ground granulated blast furnace slag (GGBFS), fresh properties, mechanical strength and chloride resistance of CRC were evaluated. Results show that the fillers adopted enhance the toughness of CRC in terms of ductility index considering splitting-tensile and compressive strength, among which SF has the most positive effect. Micro-aggregate effect of FA particles, high active silica content of SF and more Friedel's salt formation are the main reasons for the improved impermeability of CRC. Radar charts are plotted to analyze the overall performance of CRC with fillers. Relative area values indicate that SF exhibits the most significant improvement in CRC performance, followed by GGBFS and FA.

中文翻译：

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提高橡胶粉混凝土延展性和抗渗性的填料

橡胶粉混凝土（CRC）是一种环保混凝土材料，引起了基础设施建设和废物管理领域的浓厚兴趣。但应特别关注其渗透性，因为它是决定建筑结构使用寿命的重要指标，特别是在沿海地区。本研究讨论了火山灰填料提高 CRC 延展性和抗渗性的可行性。通过掺入粉煤灰（FA）、硅粉（SF）和磨碎的粒状高炉矿渣（GGBFS），对CRC的新鲜性能、机械强度和抗氯化物进行了评估。结果表明，考虑到劈裂拉伸强度和压缩强度，所采用的填料在延展性指数方面提高了CRC的韧性，其中SF的效果最为积极。 FA颗粒的微聚集效应、SF活性二氧化硅含量高以及更多的弗里德尔盐形成是CRC抗渗性能提高的主要原因。绘制雷达图来分析带有填料的 CRC 的整体性能。相对面积值表明 SF 在 CRC 性能方面表现出最显着的改进，其次是 GGBFS 和 FA。