不同砂率及骨料粒径对塑性混凝土断裂韧度的影响  

Effects of different sand rates and aggregate sizes on fracture toughness of plastic concrete

作　　者：刘国豪 甘磊[1] 刘玉 吴志刚 李健 齐建飞 许翼飞 LIU Guohao;GAN Lei;LIU Yu;WU Zhigang;LI Jian;QI Jianfei;XU Yifei(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;China Anneng Group Second Engineering Bureau Co.,Ltd.,Nanchang 330000,China;Qingdao Water Conservancy Survey and Design Institute Co.,Ltd.,Qingdao 266100,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]中国安能集团第二工程局有限公司,江西南昌330000 [3]青岛市水利勘测设计研究院有限公司,山东青岛266100

出　　处：《水利水电科技进展》2024年第3期39-44,87,共7页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金项目(52379123);河海大学优秀研究生学位论文培育项目(422003467);中国安能集团自筹科技项目(823166816)。

摘　　要：为研究不同砂率和骨料粒径对塑性混凝土断裂韧度的影响,开展了塑性混凝土力学性能测试和三点弯曲切口梁断裂试验,分析了不同配合比塑性混凝土物理力学韧度和表观形态,揭示了不同砂率和骨料粒径塑性混凝土断裂韧度的演化规律。结果表明:不同砂率和骨料粒径下的塑性混凝土强度和断裂韧度变化过程差异明显,随着砂率由45%增大至85%,塑性混凝土强度和断裂韧度在骨料粒径为0~5 mm时均下降明显,5~10 mm时均呈上升趋势,但断裂韧度上升幅度较低;骨料粒径为10~20 mm时,试件强度的变化规律与5~10 mm时相似,总体呈上升趋势,随着砂率由45%增大至85%时断裂韧度先下降后上升;同一配合比条件下塑性混凝土强度、特征荷载和断裂韧度随骨料粒径变化的变化规律较一致。To investigate the effects of different sand rates and aggregate sizes on the fracture toughness of plastic concrete,mechanical property tests and three-point bending notched beam fracture tests were conducted to analyze the physical and mechanical properties and apparent morphology of plastic concrete with different mix ratios.The evolution of fracture toughness of plastic concrete with different sand rates and aggregate sizes was revealed.The results show that the strength and fracture toughness of plastic concrete with different sand rates and aggregate sizes vary significantly.With an increase in the sand content from 45%to 85%,the strength and fracture toughness of plastic concrete exhibit a noticeable decline and an upward trend for aggregate particle sizes in the range of 0 to 5 mm and 5 to 10 mm,respectively,but the variation in fracture toughness is comparatively lower.For aggregate particle sizes ranging from 10 to 20 mm,the specimen strength variation law is comparable to that observed for particle sizes between 5 and 10 mm,with a general upward tendency.With an increase in the sand content from 45%to 85%,the fracture toughness first decreases and then increases.The changes in strength,characteristic load,and fracture toughness of plastic concrete under the same mix ratio conditions are relatively consistent with the variation of aggregate particle size.

关 键 词：塑性混凝土 砂率 骨料粒径 抗压强度 抗拉强度 断裂韧度 

分 类 号：TV41[水利工程—水工结构工程]