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蓝   洋1  ,  谢开仲2 ,  潘   峰3

 

( 1 .  广西路桥工程集团有限公司 ，南宁 530000 ;  2.  广西大学 土木建筑工程学院 ，南宁 530004 ;

3 .  广西长兴工程建设有限公司 ，南宁 530000)

摘   要 ：为提升隧道衬砌用再生混凝土的综合性能 ，在 30% 再生粗骨料替代率下 ，采用正交试验法系统研究了粉煤灰掺量 、玄武岩纤维掺量与长度 、水胶比等因素对混凝土力学与耐久性能的影响。结果表明：粉煤灰掺量 25% 、玄武岩纤维掺量 0. 20% 、纤维长度 12 mm 、水胶比 0. 35 的配合比综合性能最优 ，28 d 抗压强度和抗拉强度最高 ；水胶比为影响再生混凝土性能的最主要因素 ；在冻融 －硫酸盐耦合环境下 ，粉煤灰掺量为 15% 、玄武岩纤维掺量为 0. 1% 、纤维长度为 6 mm 、水胶比 0. 35 时的再生混凝土的力学保持率更优。研究表明 ，粉煤灰与玄武岩纤维的协同掺入可显著提升再生混凝土的力学与耐久性能 ，为其在寒冷与侵蚀环境下的隧道结构中推广提供技术支撑。

关键词：再生混凝土 ；粉煤灰 ；玄武岩纤维 ；力学性能 ；冻融－硫酸盐耦合作用 ；耐久性

中图分类号：U454           

文献标志码：A           

文章编号： 1005- 8249   (2025)  04- 0051- 06

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .04.010

 

LAN Yang1  ,  XIE Kaizhong2 ,  PAN Feng3

( 1 . Guangxi Road and Bridge Engineering Group Co . , Ltd. , Nanning 530000 , China;

2. School of Civil Engineering and Architecture , Guangxi University , Nanning 530004 , China;

3 . Guangxi Changxing Engineering Construction Co . , Ltd. , Nanning 530000 , China)

Abstract : To enhance the overall performance of recycled concrete used in tunnel linings , an orthogonal experimental method was employed under a 30% recycled coarse aggregate replacement rate to systematically investigate the effects of fly ash content , basalt fiber content and length , and water - binder ratio on the mechanical and durability properties of the concrete . The results indicate that the optimal overall performance was achieved with a mix of 25% fly ash , 0. 20% basalt fiber , 12 mm fiber length , and a water - binder ratio of 0. 35 , yielding the highest 28 - day compressive and tensile strengths . The water - binder ratio was identified as the most influential factor. Under coupled freeze - thaw and sulfate attack conditions , the mix with 15% fly ash , 0. 10% basalt fiber , 6 mm fiber length , and a water - binder ratio of 0. 35 exhibited superior strength retention. The study demonstrates that the synergistic incorporation of fly ash and basalt fibers can significantly improve the mechanical and durability properties of recycled concrete , providing technical support for its application in tunnel structures exposed to cold and aggressive environments .

Key words : recycled concrete; fly ash; basalt fiber; mechanical properties; freeze - thaw and sulfate coupling; durability

基金项目：广西重点研发项目（ 桂科 AB18050013) 。

作者简介：蓝   洋  (1978—) ,   男 ，本科 ，高级工程师 ，研究方向：道路工程。

通信作者：谢开仲  (1974—) ,  博士 ，教授 ，研究方向： 土木建筑。

收稿日期：2025 - 05 - 12