基于早龄期超声测试的堆石混凝土工程质量检测  

Construction Quality Assessment of Rock Filled Concrete Based on Early Age Ultrasonic Wave Test

作　　者：商峰[1] 周虎[2] SHANG Feng;ZHOU Hu(State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Department of Hydraulic Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038 [2]清华大学水利水电工程系,北京100084

出　　处：《建筑材料学报》2022年第2期214-220,共7页Journal of Building Materials

基　　金：“十三五”国家重点研发计划项目(2018YFC0406903);中国水电水利规划设计研究总院科研专项(DJ-ZDXM-2017-03);中国水利水电科学研究院科研专项(SS0145B122017,SS0145B462019)。

摘　　要：从早龄期开始采用超声波对大尺寸自密实混凝土和堆石混凝土进行了对比测试,并基于黏弹性介质波动理论从纵波波速测量结果中分离出材料的黏性特征参数,用于分析堆石混凝土的浇筑状态,评价堆石混凝土的施工质量.结果表明:由于堆石混凝土内部结构复杂,仅依靠代表性体积单元的超声波速均值和变异系数难以对堆石混凝土的浇筑质量做出可靠的评价,因而需要进行高密度的分层检测;应用材料的黏性特征参数进行分析判断时,有可能采用较少的测线完成检测,这在工程实践中是更具有应用价值的方法.应用早龄期超声测试的方法有助于克服由于代表性单元尺寸过大给堆石混凝土工程质量评价带来的困难.Ultrasonic wave tests were applied on the large size specimen made of self-compacting concrete and rock filled concrete since the early age.Based on the viscoelastic medium wave theory,the viscosity parameter was separated from P-wave velocity test data and used for the assessment of work ability of the fresh rock filled concrete and hardened state of the rock filled concrete.It can be concluded that due to the complexity of the inner structure of rock filled concrete,the average P-wave velocity and the coefficient of variation of the representative element volume can hardly be used for the construction quality assessment;the high density layered detection has to be applied.Comparatively,much less detection will be enough based on the viscosity parameters separated from the P-wave data.The test of early age ultrasonic wave would be helpful to overcome the difficulties brought by the excessive size of the representative element volume in rock filled concrete.

关 键 词：堆石混凝土 自密实混凝土 黏弹性介质波动理论 超声检测 

分 类 号：TB553[理学—物理]