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渗透性结晶材料对再生骨料及再生骨料混凝土力学性能和孔隙率性能的影响

Effect of Permeable Crystalline Materials on the Mechanical and Porosity Property of Recycled Aggregate and Recycled Aggregate Concrete.

作者信息

Li Pengfei, Gan Wenhao, Yao Guoyou, Huang Qiao, Zhao Renming

机构信息

College of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China.

Suzhou Guardex New Material Technology Co., Ltd., Suzhou 210500, China.

出版信息

Materials (Basel). 2023 Jun 26;16(13):4596. doi: 10.3390/ma16134596.

DOI:10.3390/ma16134596
PMID:37444910
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10342667/
Abstract

This study investigates the potential of permeable crystalline materials to improve the properties of recycled aggregates and recycled aggregate concrete (RAC). The use of recycled aggregates in concrete production has gained increasing attention due to environmental and economic benefits. However, the lower quality and poorer durability of recycled aggregates limit their wider application. In this study, three types of recycled aggregates were treated with permeable crystalline materials, and their water absorption and crushing index were compared before and after modification. RAC was then produced using modified recycled aggregates with different substitution rates, and their mechanical properties were evaluated. To investigate the mechanism of permeable crystalline materials modification, the microstructure of the modified RAC was observed using nuclear magnetic resonance and scanning electron microscopy. The results demonstrated that the permeable crystalline materials treatment effectively reduced the water absorption and crushing index of the recycled aggregates. The compressive strength of modified RAC also improved, with a higher modification time leading to higher strength. Furthermore, the pore distribution and microstructural denseness of the modified recycled aggregates and RAC were enhanced, as revealed by the microstructural observations. These findings suggest that permeable crystalline materials modification is a promising method for improving the properties of recycled aggregates and RAC, which could contribute to the sustainable development of the construction industry.

摘要

本研究探讨了渗透性结晶材料改善再生骨料及再生骨料混凝土（RAC）性能的潜力。由于环境和经济效益，再生骨料在混凝土生产中的应用越来越受到关注。然而，再生骨料质量较低且耐久性较差限制了其更广泛的应用。在本研究中，对三种类型的再生骨料进行了渗透性结晶材料处理，并比较了改性前后它们的吸水率和压碎指标。然后使用不同替代率的改性再生骨料制备RAC，并评估其力学性能。为了研究渗透性结晶材料改性的机理，利用核磁共振和扫描电子显微镜观察了改性RAC的微观结构。结果表明，渗透性结晶材料处理有效地降低了再生骨料的吸水率和压碎指标。改性RAC的抗压强度也有所提高，改性时间越长强度越高。此外，微观结构观察表明，改性再生骨料和RAC的孔隙分布和微观结构致密性得到了改善。这些发现表明，渗透性结晶材料改性是改善再生骨料和RAC性能的一种有前景的方法，这有助于建筑业的可持续发展。

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