龄期对水工碾压混凝土物理力学性能影响试验研究  

Experimental study on the influence of age on the physical and mechanical properties of hydraulic roller-compacted concrete

作　　者：徐巧巧 李洪艳 XU Qiaoqiao;LI Hongyan(Shenzhen Shenshui Water Consulting Co.,Ltd.,Shenzen 518024,China;China Gezhouba Group No.2 Engineering Co.,Ltd.,Chengdu 610091,China)

机构地区：[1]深圳市深水水务咨询有限公司,广东深圳518024 [2]中国葛洲坝集团第二工程有限公司,四川成都610091

出　　处：《水利建设与管理》2023年第12期38-43,共6页Water Conservancy Construction and Management

摘　　要：为探究龄期对水工碾压混凝土物理力学特性的影响,分别在7d、28d、90d、180d对二级配碾压混凝土开展抗压强度、抗拉强度、干缩率、徐变以及绝热温升等试验。结果表明:抗压强度、抗拉强度和干缩率均随着龄期增长呈现先增大后平稳的趋势,加载方式的不同会导致劈拉强度和轴拉强度存在差异;抗压弹性模量随龄期增长呈现对数函数增长,但随着龄期延长,弹强比呈指数式降低,表明其抗裂性能逐渐增强;徐变随着持荷时间的增加非均匀增大,但随试件龄期增长而减小;绝热温升曲线前期迅速抬升,后期逐渐趋于稳定,主要受到水化反应进程和速率的控制。此研究成果可为水工碾压混凝土配合比优化、性能改善提供参考。In order to investigate the influence of age on the physical and mechanical properties of hydraulic compacted concrete,tests on compressive strength,tensile strength,dry shrinkage,creep,and adiabatic temperature rise were carried out at 7 days,28 days,90 days,and 180 days respectively on the secondary gradation compacted concrete.The results show that compressive strength,tensile strength,and drying shrinkage initially increase and then stabilize with increasing age.Different loading modes result in differences in split tensile strength and axial tensile strength.Compressive elastic modulus increase logarithmically with age,while the modulus of elasticity decreases exponentially with age,indicating an enhancement in crack resistance over time.Creep increases unevenly with the duration of loading but decreases with specimen age.The early stages of the adiabatic temperature rise curve exhibits a rapid increase,followed by a gradual stabilization,primarily controlled by the hydration reaction process and rate.These research findings can serve as a reference for optimizing the mix design and improving the performance of hydraulic roller-compacted concrete.

关 键 词：碾压混凝土 龄期 力学特性 变形特性 绝热温升 

分 类 号：TV431.1[水利工程—水工结构工程]