考虑龄期影响的水利工程混凝土耐久性演化研究

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中图分类号：TQ178 文献标志码：A文章编号：1001-5922（2026）03-0677-04

Study on durability evolution of hydraulic engineering concrete considering the influence of age

FENG Qinglan （Hebei Province Cangzhou Bohai New Area Huanghua City Agriculture and Rural Development Bureau，Huanghua O611OO，Hebei China）

Abstract：To quantify the influence of ageonthedurabilityof hydraulic engineering concrete，a multi-age test scheme was designed and implemented inthisstudy，and asystematicexperimental analysis was conductedon indicators icluding compressive strength，chloride ion difusion coeffcient，carbonation depth and freeze-thaw cycles. Theresults showed that with the extension of age，the compressive strength ofconcrete increased significantly，while its permeabilityand deterioration sensitivity decreased remarkably.Among them，thechloride ion difusioncoefficient of the specimens at 18O d age decreased by 63.2% and the dynamic elastic modulus attenuation rate reduced by 66.7% compared with the 7 d group.Structural detection indicated that the decrease in porosity，the narrowing of theinterfacial transition zone（ITZ）width and the increase in the proportion of gel pores were the core mechanisms for the improvement of concrete performance.An age-diffusion index model was established based on the measured data，with the prediction deviation controlled within 4.7% .Thisstudy verifies the important value of extending the wet curing age in improving the servicestabilityof hydraulic engineering concrete，and provides theoretical support for durability design and optimization of curing strategies.

Key words： water conservancy project ;concrete durability;ageing effect;chloride ion difusion;maintenance strategy水利工程混凝土在长期服役中承受水流冲刷、 盐蚀侵蚀及冻融循环等多重作用，其耐久性直接决定工程寿命与运行安全。（剩余6445字）