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舒   亮^1,2 , 王晓磊^1,2 , 刘历波^1,2 , 李彦苍¹ , 周宏峰³

 

(1. 河北工程大学 土木工程学院 , 邯郸   056038; 2. 邯郸市城市地下空间工程技术创新中心 , 邯郸    056038;

3. 承德中天建设工程检测试验有限公司 , 承德   067000)

摘  要: 针对我国北方盐渍地区建筑结构常年遭受盐类侵蚀和冻融循环多重作用而劣化等问题 , 利用粉煤灰和煤矸石替代部分普通混凝土中的水泥和粗骨料 , 制备粉煤灰煤矸石混凝土 。从混凝土冻融外貌形态 、质量损失 、动弹性模量变化三方面探究其损伤规律 , 在清水 、硫酸盐 、复合盐三种介质环境中建立了以动弹性模量为损伤变量的煤矸石混凝土冻融损伤模型 , 并对其抗盐冻耐久性进行评价 。结果表明 : 在三种不同介质环境中 ,复合盐对混凝土的冻融损伤最大 , 其中粉煤灰煤矸石混凝土抗盐冻表现最佳 , 250 次盐冻循环后才到达破坏临界值 , 质量损失率大于 5% , 相对动弹性模量下降了 48. 5% ; 粉煤灰煤矸石混凝土具有良好的抗盐冻性能 , 粉煤灰的掺入对其抗冻性能的提升效果显著 , 在单一盐类冻融侵蚀环境下 , 抗冻等级能达到 F250, 在复合盐溶液盐冻情况下为 F200; 拟合的方程和建立的冻融损伤模型能较好反映其真实冻融损伤情况 。研究成果为探究粉煤灰煤矸石混凝土在盐侵蚀与冻融双重作用下的性能退化提供了理论依据和试验参考。

关键词: 煤矸石 ; 冻融循环 ; 盐冻耦合 ; 质量损失 ; 相对动弹性模量 ; 冻融损伤模型

中图分类号: TU528      文献标志码: A      文章编号: 1005-8249 (2026) 04-0001-08

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 04. 001

 

Study on the Salt-Frost Resistance of Fly Ash-Coal Gangue Concrete

under Complex Erosive Environments

SHU Liang^1,2 , WANG Xiaolei^1,2 , LIU Libo^1,2 , LI Yancang¹ , ZHOU Hongfeng³

(1. College of Civil Engineering Hebei University of Engineering, Handan 056038, China;

2. Urban Underground Space Engineering Technology Innovation Center in Handan City, Handan 056038, China;

3. Chengde Zhongtian Construction Engineering Testing and Experimentation Co. , Ltd. , Chengde 067000, China) 

Abstract : In response to the problem of deterioration of building structures in saline alkali areas in northern China due to salt erosion and multiple freeze-thaw cycles, fly ash and coal gangue were used to replace some of the cement and coarse aggregates in ordinary concrete to prepare fly ash coal gangue concrete. The damage law of the concrete was explored from three aspects: freeze-thaw appearance, quality loss, and dynamic elastic modulus changes.  A freeze -thaw damage model of coal gangue concrete with dynamic elastic modulus as the damage variable was established in three media environments: clean water, sulfate, and composite salt. A quadraticequation was used to fit the experimental data, and the fitting results were good. The salt frost durability of the concrete was evaluated. The results indicate that in three different medium environments, composite salt has the greatest impact on the freeze-thaw damage of concrete. Among them, fly ash-gangue concrete exhibits the best performance in resisting salt and frost. It only reaches the damage threshold after 250 cycles of salt and frost, with a mass loss rate of more than 5% and a relative dynamic elastic modulus decrease of 48. 5% ; Fly ash and coal gangue concrete have good salt and frost resistance, and the addition of fly ash can improve its frost resistance. In clear water and sulfate freeze-thaw environments, the frost resistance level can reach F250, and in composite salt solution salt and frost conditions, it is F200; The fitted equation and the established freeze-thaw damage model can better reflect its true freeze-thaw damage situation, and the research results can provide reference for its durability design in complex environments.

Key words: coal gangue; freeze-thaw cycle; salt freeze coupling; mass loss; relative dynamic elastic modulus; freeze-thaw damage model