Study on real-time construction quality monitoring of storehouse surfaces for RCC dams

Implementation of Online Reverse Auctions: Comparison of Czech and Slovak Construction Industry

“…It is therefore crucial that ORA are applied primarily for such purchases where the subject of delivery can be well controlled and monitored during the execution of the delivery. Proper site monitoring is considered a fundamental activity contributing to the minimization of the rate of defects in construction projects (Leung et al, 2008) and requires timely collection and extensive analysis of data on construction processes (Liu et al, 2015). From this viewpoint, the performance of construction works under technical supervision ensured by the investor seems to be appropriate situation for ORA; on the other hand, the delivery of project documentation or the purchase of products based primarily on the utilization of mental skills (consultancy etc.)…”

Experimental study on real-time control of roller compacted concrete dam compaction quality using unit compaction energy indices

“…Typically, the real-time dam compaction quality monitoring system proposed by Zhong et al [14,15] could monitor the compaction passes, roller velocity, compacted thickness, compacted elevation and exciting force state in real time during dam construction, which has been successfully applied to the construction quality control of the Ludila, Longkaikou, and Fengman RCC dams in China. Based on the real-time monitoring system, Liu et al [16] established the compactness model for the core wall dam using real-time monitored compaction parameters and material gradation as independent variables.…”

“…The compaction quality monitoring system [14,15] provides a practical solution for monitoring and collecting compaction parameters. Normally, a GPS antenna is installed on top of the cab to collect the dynamic coordinates of rollers, and the real-time monitoring system subsequently uses the coordinates to calculate and display the compaction pass, roller velocity, and compacted layer thickness in real time; an accelerometer is fixed on the axle of the drum to measure the real-time drum acceleration during the compaction process [23], and the vibrating frequency and vibrating amplitude are automatically read thereafter from the spectral analysis program in the controller.…”

“…The compaction parameters in the verification samples were collected by the real-time compaction quality monitoring system [14,15], which has been popularly applied in the quality control of RCC dams. The compacted density was measured using a nuclear densimeter device, and the vibratory roller used in the project was BOMAG 202AD-4, the technical data of which are shown on the BOMAG website [21].…”

Evaluation of compaction quality of earth-rock dam based on bacterial foraging-support vector regression algorithm

“…Liu Yvxi etc. [9], taking the climatic conditions of construction and integrating climatic data and compaction data, establish multiple linear regression model for compaction quality evaluation. The above researchers applied traditional method a Corresponding author: jiajun_2014_bs@tju.edu.cn to establish the compaction quality prediction model, although they can guide the constructors to a certain extent, the reliability of their assessment outcomes is not enough due to the poor accuracy.…”