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Taking the self-compacting concrete pouring of steel shell immersed tubes in Shenzhen-Zhongshan Channel as the research background, the workability of the self-compacting concrete mix ratio was verified by the single-bin scale model test, and the location and cause of the defects during the concrete pouring were grasped. The ratio of defect area and volume, the maximum / average defect depth, the main defect distribution and other parameters of the top surface of the concrete pouring were tested by using two-level grayscale processing method and the stone powder filling method, the larger defects are often concentrated near the blanking opening and the back of the top stiffener, which provides data support for the subsequent construction of the steel shell immersed tube self-compacting concrete. [ABSTRACT FROM AUTHOR]

In the process of ocean engineering construction, considering the rainfall is frequent at engineering field, there isn't enough long time to dry the coral sand, so the coral sand is half dry when used. Studying the performance of half-dry coral sand which under the natural conditions is very useful for mixing coral sand concrete, reducing construction cost and has high research significance and application value. The test results show that the coral sand early water absorption speed is very fast, 2 h water absorption rate reached 2.5 %, water absorption speed gradually slow down after 10 h, 48 h water absorption rate reached 6.4 %, water absorption rate has an obvious turning point at 8 h when water absorption rate is 5.3 % at 8 h, is 83 % of 48 h water absorption rate. Select feature water absorption rate 4 % to 6 % as additional water consumption, and determine the total water/cement ratio and pure water/cement ratio are reasonable, can reflect the reality of the coral sand concrete pure water/ cement ratio, pre-wetting can significantly improve the coral sand concrete working performance and mechanical properties. [ABSTRACT FROM AUTHOR]

Technical innovation represents an enterprise's core competitiveness. It's the source of power for sustainable development of the enterprise. The research, application and promotion of new technology, new material, new equipment and new process will improve a construction enterprise's productivity, core competitiveness on market and economic benefit. This article introduces the methods for patent development in construction engineering, such as enumerating of hope points, integrated innovation, and integration of technologies, with an aim to provide effective methods for construction enterprises to develop patents. [ABSTRACT FROM AUTHOR]