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高理想^1 ,  张海燕²

 

( 1. 雄安宣武医院 , 雄安新区   070001 ;  2.  石家庄市政设计研究院有限责任公司 ,  石家庄   050000)

摘  要 :  针对透水混凝土因其多孔结构而存在力学强度不足及使用寿命有限的问题 。采用粉煤灰  ( FA) 、玻璃粉  ( GP)  部分取代水泥制备透水混凝土 ,  系统分析了 FA 、GP 掺量对透水混凝土的密度 、连通孔隙率 、透水系数 、抗压强度 、弯拉强度的影响规律 , 并采用 SEM 对微观形貌变化进行了观测 。结果表明 :  随 FA 、GP 掺量增加 , 透水混凝土的密度逐渐上升 , 连通孔隙率 、透水系数相应下降 ;  FA 和 GP 的早期龄期火山灰效应弱 ,  在长龄期水化过程中生成更多 C-S-H 凝胶 , 显著增强了力学强度 , 90 d 抗压与弯拉强度随 FA 掺量增加先增大后减小  (15%掺量最佳) 、随 GP 掺量增加而增大 ,  掺 GP 增强效果优于 FA ;  综合分析表明 ,  FA 、GP 可在仅小幅度降低透水性能的前提下 , 有效提升透水混凝土力学强度 。研究结果可为透水混凝土的配合比优化提供理论参考。

关键词 : 粉煤灰 ; 玻璃粉 ; 透水混凝土 ; 透水能力 ; 力学强度 ; 微观形貌

中图分类号 : TU528           文献标志码 : A           文章编号 :  1005- 8249  (2026)  03-0013-07

DOI :10. 19860/j. cnki. issn1005- 8249. 2026. 03. 003

GAO Lixiang¹ , ZHANG Haiyan²

( 1. Xiong ’an Xuanwu Hospital ,  Xiong ’an New Area 070001 ,  China;

2. Shijiazhuang Municipal Design and Research Institute Co. , Ltd. ,  Shijiazhuang 050000 ,  China)

Abstract :  To address the issues of insufficient mechanical strength and limited service life inherent in permeable concrete due to its porous structure , fly ash ( FA) and glass powder ( GP) were partially substituted for cement in its preparation.   A systematic analysis was conducted  on  the  influence  of  FA  and  GP  content  on  the  density ,  connected  porosity ,  permeability coefficient , compressive strength , and flexural strength of the permeable concrete.   Additionally ,  SEM was employed to observe changes in microstructure morphology.   Results indicate that as  FA and  GP  content increases , the density of permeable concrete gradually rises while connected porosity and permeability coefficient correspondingly decrease.   The early-age pozzolanic effect of FA and GP was weak , but during the long - age hydration process , increased C- S- H gel formation significantly enhanced mechanical strength.   At 90 days , compressive and flexural  strengths first increased then decreased with increasing FA content  ( with  15% being optimal) , while  GP  content  increases both compressive and flexural strength , with GP  exhibiting  superior strengthening effects compared to FA.   Comprehensive  analysis  indicates  that FA and GP  can  effectively enhance the mechanical  strength of  permeable concrete with only a slight reduction in permeability.   These  findings  provide theoretical  guidance for optimizing the mix design of permeable concrete.

Key words :  fly ash; glass powder; permeable concrete ; water permeability; mechanical strength; microscopic morphology