冻融循环作用下路基再生混凝土的力学性能及能量演化规律研究
Study on mechanical properties and energy evolution of roadbed recycled concrete under freeze-thaw cycles
关键词：
路基再生混凝土；冻融循环；围压；三轴试验；力学性能；能量演化；模型
Key words：
Roadbed recycled concrete; Freeze-thaw cycle; Confining pressure; Triaxial test; Mechanical property; Energy evolution; Model
刊期：
2026年第2期
DOI：
10.19761/j.1000-4637.24100555
文章编号：
基金项目：
中南大学中央高校基本科研业务费专项资金项目（No.2018zzts734）。
作者：
孙宝昌1，郭春志2，*，陈兆志3，刘泽霖4
单位：
1.国家能源投资集团有限责任公司，北京 100088；2.中国船级社质量认证有限公司北京分公司，北京 100007；3.北京云星宇交通科技股份有限公司，北京 100070；4.中南大学，湖南 长沙 410083
摘要
摘 要：对不同冻融循环次数（0、10、20、30、40次）后的再生混凝土试件，开展了不同围压（0、3、6、9、12 MPa）下的常规三轴荷载试验。结果表明：再生混凝土试件应力-应变曲线初始压密阶段的应变与冻融循环次数呈正相关关系，与围压呈负相关关系，而塑性屈服阶段的应变分别与围压、冻融循环次数呈正相关关系；随着围压的增大，再生混凝土的抗压强度、轴向峰值应变、弹性模量均增大，而泊松比未表现出统一的变化规律；随着冻融循环次数的增加，再生混凝土的抗压强度、弹性模量均降低，轴向峰值应变逐渐增大，泊松比未呈现统一变化规律；适量增大围压可有效提升试件从加载至破坏的总能量，而冻融循环次数的增加对总能量的影响基本呈现先增后降的规律；当围压为0时，随着冻融循环次数的增加，再生混凝土试件峰值应力前的弹性能占比减小，所建立的冻融循环作用后再生混凝土劣化系数模型的精度较高。
Abstract： Conventional triaxial loading tests were conducted on recycled concrete specimens subjected to various freeze-thaw cycle counts (0, 10, 20, 30, 40 times) under different confining pressures (0, 3, 6, 9, 12 MPa). The results show that the strain in the initial consolidation stage of the stress-strain curve of recycled concrete specimens is positively correlated with the freeze-thaw cycle counts and negatively correlated with the confining pressure. While the strain in the plastic yielding stage is positively correlated with the confining pressure and the freeze-thaw cycle counts, respectively. As confining pressure increases, the compressive strength, axial peak strain, and elastic modulus of recycled concrete all increase, while the Poisson′s ratio exhibits no consistent variation pattern. With the increase of freeze-thaw cycle counts, the compressive strength and elastic modulus of recycled concrete decrease, while the axial peak strain gradually increases, and the Poisson′s ratio shows no consistent variation pattern. Properly increasing confining pressure effectively enhances the total energy absorbed by specimens from loading to failure, while the effect of increasing freeze-thaw cycle counts on total energy generally follows a pattern of first increasing then decreasing. When confining pressure is 0, the proportion of elastic energy before peak stress in recycled concrete specimens gradually decreases with increasing freeze-thaw cycle counts, and the degradation coefficient model of recycled concrete after freeze-thaw cycles demonstrates high accuracy.
结论
（1）再生混凝土应力-应变曲线的压密阶段应变与冻融循环次数呈正相关关系，与围压呈负相关关系；塑性屈服阶段的应变分别与围压、冻融循环次数呈正相关关系。围压增大和冻融循环次数增加会明显减缓试件峰后破坏阶段应力递减速率，且二者均会使再生混凝土试件的延性转化趋势更明显。
（2）随着围压的增大，再生混凝土的抗压强度、轴向峰值应变及弹性模量均呈现增大趋势；随着冻融循环次数的增加，再生混凝土的抗压强度和弹性模量均逐渐降低，轴向峰值应变逐渐增大；泊松比在上述2种工况下均无统一变化规律。
（3）随着围压的增大，压密阶段持续时长逐渐变短，而随着冻融循环次数的增加，该阶段逐渐变长；适量增大围压可有效提升试件从加载至破坏的总能量，而冻融循环次数的增加对总能量的影响基本呈现出先增后降的规律。
（4）当围压为0时，随着冻融循环次数的增加，再生混凝土试件峰值应力前的弹性能占比逐渐减小，耗散能占比逐渐增大；基于冻融循环次数建立的再生混凝土劣化系数模型具有较高的精度。
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引用本文
孙宝昌,郭春志,陈兆志,等.冻融循环作用下路基再生混凝土的力学性能及能量演化规律研究[J].混凝土与水泥制品,2026(2):69-75.
SUN B C,GUO C Z,CHEN Z Z,et al.Study on mechanical properties and energy evolution of roadbed recycled concrete under freeze-thaw cycles[J].China Concrete and Cement Products,2026(2):69-75.
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