Advanced Materials Research Vols. 250-253

Abstract: In view of the settlement of highway soft foundation, the paper proposes a method to predict soft foundation settlement based on BP neural network model, taking advantage of the strong non-linear mapping and learning ability of BP neural network. Then it is compared with the three-point method, obtaining some useful conclusions. Since the BP neural network model is directly based on real samples, it could avoid the mistakes due to factitiousness in the three-point method. It is proved that the BP neural network model is accurate and the settlement has least error.

Abstract: A soft rock is generally prohibited to be used as filling material for highway subgrade. A novel method for improving the performance of subgrade is proposed. Aiming at the large amount of highly weathered soft rock along Shiyan-Tianshui superhighway, the physical and mechanical properties of the natural soft rock is analyzed. Then the cement is mixed into the soft rock as filling material to better the subgrade performance.The field and indoor experiments showed that the maximum dry density and optimum water content increases when the cement content increases. By mixing the cement, the subgrade performance can be significantly improved.

Abstract: With the rapid development of highway construction and rehabilitation, more and more waste asphalt mixture is produced. The waste is under great environment pressure. The reuse of the waste is urgent. Foamed asphalt cold recycling is a solution. In this paper, the foaming abilities of different kinds of asphalts are tested and the best foaming asphalt is found out. Then, the RAP is evaluated. Finally, the properties of the cold recycling mixture are studied. As a comparison, two different gradations with different amount of RAP are designed and their performances are evaluated. By all these tests, it is illustrated that the cold recycled asphalt mixture with foamed asphalt can fulfill all the technical requirements. The foamed asphalt mixture began its first use in Beijing and exhibits well.

Abstract: Using aluminium sulphate (AS) and chitosan as the main coagulant and coagulant-aid respectively, the high algae-laden water was treated by coagulation /flocculation/sedimentation (C/F/S). When the dosage ranges of AS and chitosan were 35~45 mg/L and 0.4~0.7 mg/L respectively, the removal rates of turbidity, algae cells and TOC were all enhanced apparently compared with adding AS alone. Especially the effective removal of organic matters has a significant sense. The compound action of AS and chitosan can reduce dosage of aluminum salt coagulant for meeting the treatment requirements, which means reduction of residual aluminium in treated water. The algae flocs generated by coagulation aid of chitosan were larger and more compact and had a faster settling velocity. So the application of chitosan can bring better environmental and economic benefits in water treatment.

Abstract: Continuously increasing municipal renovation and roadbed excavation produced a considerable quantity of solid waste each year such us miscellaneous fill mixed with broken pavement fragments and brickbats, which resulted in a series of urban environment and soil resource issues. Comprehensive recycling technology for soil modification to attain the strength requirements of subgrade fillings from the related road construction codes is necessary and even urgent, since the usual soil replacement is not the economic and environment-friendly method. The field investigation and laboratorial tests hereby had been completed to confirm the application potentials of typical soil specimens selected from different locations. The experimental results indicate some of specimens can be reused as subgrade fillings in road construction immediately and others should be treated by soil amelioration. To further certify the practicality of this recycled technology and broaden its range of application, three typical reutilization and treatment techniques, cold recycling, soil solidification and dynamic consolidation are introduced into engineering projects.

Abstract: By studying log construction in Changbaishan area, this article sets to analyze the architectural characteristics of log construction in the process of adjusting to the regional characteristics in Northeast China and therefore, provides references for designing modern architecture with local features under the backdrop of economic and cultural globalization.

Abstract: As one assessment method of the water resources, Water Poverty Index has become an available tool in water resources management for it simply calculation process, comprehensive understanding of the results. This paper introduces the concept of the Water Poverty Index, and applies it at these districts of Yellow River Basin by using equal weightings methodology. During the process of calculating it, some component variables of the WPI have been improved and the data addressed standardization. The result shows that the water resources of Shandong is safe, Sichuan and Henan province is middling safe and low safe, while the WPI of the other six provinces is so low which reflects water resources shortage is very severe. The same time, this paper analysis the main reasons of water poverty, which provides the access to improve the water resource management in these districts.

Abstract: Dry-mixing self-compacting concrete (DSCC) is a kind of new concrete composite materialswhich based on self-compacting concrete vibration. DSCC was prepared with the cement, the coarse aggregate and sand of high strength and some cement replacement materials that had the better crack resistance. And it has the characteristics of filling performance, gap trafficability and anti- segregating like self-compacting concrete. The paper study on the basic mechanical properties and anti-carbonization ability of DSCC through concrete performance test, the results indicate that the basic mechanical properties and durability of DSCC better significantly than common concrete materials.

Abstract: Dynamic and static load testing for Dutou major Bridge was conducted. the test projects, the layout of measuring points and observation methods, test loadings, test methods, test results were presented, the test results showed that the strength and stiffness behavior of the bridge could meet the requirements of designation, the structure lied in a flexible working stage under test load.

Abstract: Caofeidian harbor is a large size deep-water harbor currently under construction in the eastern coast of north China. The construction began in 2003. Based on the measurements and analysis of the sediment samples collected from 2008 to 2010, the characteristics of suspended sediment concentration, suspended sediment and bed material grain diameter of the Caofeidian sea area with the progress of the engineering are presented. The measurements and analysis reveal that i) the suspended sediment concentration is low and decreases with the engineering progress; ii) the suspended sediment is very fine and becomes coarse in the deep-water channel; iii) the bed sediment in the east of Caofeidian foreland is much coarser than that in the west part.