再生骨料界面改性对高强混凝土性能的影响研究

作者：叶冕

作者简介：

叶冕，工程师，E⁃mail:243891921@ qq. com

作者单位：

深圳市建工集团股份有限公司，广东深圳 518000

摘要：

为了提高再生骨料在高强混凝土中的应用性能，研究了 2 种改性方法（水泥浆涂层处理和地质聚合物浆料处理）对再生骨料性能的影响，以及改性后再生骨料在高强混凝土中的宏观性能和微观结构变化。通过工作性能、力学性能、孔隙结构和微观结构的测试，探讨不同改性方法对再生骨料高强混凝土性能的提升效果。研究结果表明，水泥浆和地质聚合物浆料改性均显著改善了骨料与水泥基体之间的界面结合力，尤其是地质聚合物浆料，其生成的硅铝酸盐凝胶形成了致密的凝胶结构，进一步增强了混凝土的微观密实性和力学性能，在 100%替代天然骨料时，地质聚合物改性再生骨料混凝土坍落度为 220mm,抗压强度为 95MPa,渗透孔隙率低于 15%.

关键词：混凝土；再生骨料；水泥浆；地质聚合物浆料；微观结构

English：

To improve the performance of recycled aggregates in high⁃strength concrete, this paperinvestigates the effects of two modification methods （ cement paste treatment and geopolymer pastetreatment） on the properties of recycled aggregates, as well as the macroscopic performance andmicrostructural changes of modified recycled aggregates in high⁃strength concrete. Through testing ofworkability, mechanical properties, pore structure, and microstructure, the enhancement effect of differentmodification methods on the performance of recycled aggregate⁃based high⁃strength concrete was explored.The results show that both cement paste and geopolymer paste modifications significantly improve theinterface bonding between aggregates and cement matrix,with geopolymer paste treatment exhibiting a morepronounced effect. The silica⁃aluminate gel formed by geopolymer modification creates a dense gelstructure, further enhancing the microstructural compactness and mechanical properties of concrete. When100% of natural aggregates are replaced, the geopolymer⁃modified recycled aggregate concrete exhibits aslump of 220mm, compressive strength of 95MPa, and permeable porosity lower than 15%.

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混凝土 > 2026年 第卷 第04期