引气剂掺量对非饱和水工混凝土毛细吸水饱和度影响  

Influence of Air-entraining Agent Content on Capillary Water Absorption Saturation of Unsaturated Hydraulic Concrete

作　　者：周彧婕 黄耀英[1] 徐佰林 方晨 ZHOU Yu-jie;HUANG Yao-ying;XU Bai-lin;FANG Chen(College of Hydraulic&Environmental Engineering,China Three Gorges University,Yichang 443002,Hubei Province,China;Hubei Institute of Water Resources Survey and Design,Wuhan 430070,Hubei Province,China)

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]湖北省水利水电规划勘测设计院有限公司,湖北武汉430070

出　　处：《中国农村水利水电》2025年第2期173-179,187,共8页China Rural Water and Hydropower

基　　金：国家自然科学基金重点项目(52239009);国家自然科学基金项目(52179135)。

摘　　要：为探究引气剂掺量对非饱和水工混凝土毛细吸水饱和度影响,采用上吸法和侧吸法,开展了低温环境下不同引气剂掺量(质量分数分别为0■,2.50■,3.75■,5.00■,6.25■)的非饱和水工混凝土毛细吸水试验,进而研究了引气剂掺量对混凝土孔隙率、抗压强度及毛细吸水饱和度的影响,最后建立了耦合不同吸水深度和不同引气剂掺量共同作用下的非饱和水工混凝土毛细吸水饱和度预测模型。研究结果表明:随着引气剂掺量增加,水工混凝土孔隙率呈线性增大,抗压强度略呈上凸曲线减小,饱和度逐渐下降,且饱和度和吸水深度呈指数关系,上吸法、侧吸法混凝土饱和度和引气剂掺量分别呈线性关系和二次函数关系;进而基于分离变量模型建立了非饱和引气水工混凝土毛细吸水饱和度预测模型,分析表明,新模型可较好预测不同吸水深度和不同引气剂掺量共同作用下的非饱和水工混凝土毛细吸水饱和度分布规律。In order to investigate the effect of air-entraining agent dosage on the capillary water absorption saturation of unsaturated hydraulic concrete,the capillary water absorption test of unsaturated hydraulic concrete with different air-entraining agent dosage(mass fractions of 0■,2.50■,3.75■,5.00■,6.25■,respectively)was carried out in a low-temperature environment,by using infiltration absorption and horizontal absorption methods.Then the effect of air-entraining agent dosage on concrete porosity,compressive strength,and capillary water absorption saturation was studied.And finally a prediction model for the capillary water absorption saturation of unsaturated hydraulic concrete coupled with different depths of water absorption and different air-entraining agent contents was established.The results show that:with the increase of air-entraining agent dosage,the porosity of hydraulic concrete increases linearly,the compressive strength decreases slightly with an upward convex curve,and the saturation degree decreases gradually.The saturation degree and water absorption depth were exponentially related.The saturation degree of concrete and air-entraining agent admixture of the infiltration absorption and horizontal absorption methods were linearly and quadratically related,respectively.Then a prediction model of capillary water absorption saturation of unsaturated air-entraining hydraulic concrete was established based on the separation of variables model.And the analysis shows that the new model can better predict the distribution law of capillary water absorption saturation of unsaturated hydraulic concrete under the joint action of different water absorption depths and different air-entraining agent mixing amounts.

关 键 词：引气剂掺量 非饱和水工混凝土 饱和度 毛细吸水 预测模型 

分 类 号：TV431[水利工程—水工结构工程]