Experimental study on real-time control of roller compacted concrete dam compaction quality using unit compaction energy indices
Experimental study on real-time control of roller compacted concrete dam compaction quality using unit compaction energy indices
复制标题
DOI：
10.1016/j.conbuildmat.2015.08.048
复制
发表时间：
2015-10
影响因子：
7.4
通讯作者：
Donghai Liu;Z. Li;Jinlong Liu
中科院分区：
文献类型：
--
作者：
Donghai Liu;Z. Li;Jinlong Liu
振动压实是碾压混凝土区别于常规混凝土的显著特征，也是影响碾压混凝土施工质量的关键因素。碾压混凝土的压实是各压实参数综合作用的结果。单独考虑各施工参数，增加了施工控制的难度，不能保证施工质量。为此，提出了反映碾压混凝土压实参数综合效应的实时质量监测指标--单位压实能量（UCE），包括单位体积压实能量（UVCE）和单位面积压实能量（UACE），分别用于评价碾压混凝土基质和界面的压实质量。为研究UCE法预测碾压混凝土坝压实质量的方法，采用手动振动压路机进行了碾压混凝土三阶段室内压实试验。压实参数、UVCE/UACE和现场测量数据（例如，核水分密度、剪切强度）进行统计回归分析。建立了碾压混凝土基质密度回归模型和碾压混凝土界面抗剪强度回归模型，分别确定了UVCE和UACE的控制标准。此外，还开发了基于UCE的碾压混凝土现场质量实时监测系统，这是室内试验研究的后续实际应用，为碾压混凝土施工质量提供了保证。
Vibrating compaction is a marked feature distinguishing roller compacted concrete (RCC) from conventional concrete and is the key factor influencing RCC construction quality. The compaction of RCC results from the comprehensive effect of all compaction parameters. Considering every construction parameter separately would increase the difficulty of construction control and not guarantee construction quality. Therefore, real-time monitoring quality indices—namely, unit compaction energy (UCE), including unit volume compaction energy (UVCE) and unit area compaction energy (UACE), which reflect the comprehensive effect of compaction parameters—were proposed to evaluate the compaction quality of RCC matrix and interface, respectively. To investigate the UCE for predicting the compaction quality of an RCC dam, a three-part laboratory compaction experiment was conducted using a hand vibratory roller. Data on compaction parameters, UVCE/UACE and in situ measurements (e.g., nuclear moisture density, shear strength) were collected to perform statistical regression analyses. A density regression model of RCC matrix and a shear strength regression model of RCC interface were established to determine the control criteria of UVCE and UACE, respectively. Furthermore, a UCE-based real-time monitoring system was developed for field quality control, which is the subsequent practical application of the laboratory experimental study and will result in RCC construction quality assurance.