The most important step of building a new airport is site selection. Before selecting the new airport site, Airport planners should study many factors and rank the various sites. In fact, airport site selection is a complex multi-objective optimization problem, which involves a variety of factors. Taking “the civil airport construction and management requirements” as a foundation, the paper has screened and expanded the influence factors of selecting the civil airport site and constructed site appraisal system, and put forward the DAGF model,which constructed Evaluation System by improved Delphi method, obtained weighted matrix by AHP, analyzed experts score by gray correlation and got evaluation findings by Fuzzy evaluating. Meanwhile the paper has compiled the procedure of the computation process with MATLAB. Finally the research results has been applied to the selecting site of the second Capital airport in practice and obtained the satisfactory result. Therefore the paper constructed the comprehensive evaluation model, which provides the effective method for selecting the civil airport site, and makes the site selection more scientific, more reasonable and simpler. It has the extremely important reference significance and the instructional function to select the optimal airport site.
Green high performance alkali-activated slag pavement concrete(ASC) was prepared by adding Na2SiO3 and NaOH complex activator in slag. Physical, mechanical performance and durability of ASC were studied by workability, strength, hydrostatics and chlorin ion penetrability, fast freeze-thaw cycle tests and abrasion resistance tests. The results show that slump of ASC exceeds 160mm, fluidity and workability is excellent. 28d compressive and flexural trength of AAC are 91.9MPa and 8.5MPa, 7d compressive and flexural strength are 84.8MPa and 7.6MPa, which belongs to high–early strenth concrete. And its impermeability rank exceeds S40, chlorin ion impermeability is excellent, 6h eletricity is 1751~1894 coulomb, and its anti-frozen rank exceeds F300, which can meet the anti-frozen requirements in frore area. Depth of abrade slot is 0.45~0.96mm, abrasion resistance of ASC is 4.99, so its physical, mechanical performance and durability are superior to traditional portland concrete.
Green high performance alkali-slag concrete(ASC) was prepared by adding Na2SiO3 and NaOH complex activator in slag. Physical, mechanical and drying shrinkage performance of ASC were studied by workability, strength and drying shrinkage tests. The results show that slump of ASC exceeds 160mm, fluidity and workability is excellent. 28d compressive strength and flexural trength of ASC are 90MPa and 8.36MPa, 7d strength are 83.7MPa and 7.47MPa, which belongs to high–early strenth. drying shrinkage of ASC are ratherish bigger than portland concrete(PC) anytime, but correspond to PC at later period from 28d, anyhow ASC belonged to low deformation concrete but with ratherish bigger early deformation, therefore early keep should be reinforced. drying shrinkage of ASC increase with dosage of slag anytime, but don’t increase with ratio of activator solution to slag linearly. And a suited logarithm prediction model of ASC was established, which can predict the drying shrinkage of ASC.
Abstract. The rheologic action of the soft rock-soil could be accelerated by the dynamic load, which induces catastrophe instability failure and more geo-technical engineering accidents and geologic disasters. Marine deposit soft-soil in Xiamen region is taken as the test sample, of which the rheological dynamics characteristics are tested under the dynamic load by adopting the dynamic rheological tri-axial device; the failure process of the accelerating rheological catastrophe is analyzed based on the catastrophe theory. The research shows that such different changing stages as decelerating rheology, relatively stable rheology and accelerating rheology are manifested under the process of the different amplitude dynamic load, and the catastrophe way in the accelerating rheological process is the gradual failure instability. The research results is of important and theoretical significance in revealing the dynamic rheological characteristics of the soft rock-soil, exploring the accelerating rheological failure process and conditions of catastrophe instability; they are also of important and practical significance in improving and ameliorating the indicator-monitoring system and technical method for the geo-technical geological disaster, enhancing the forecast scientific and accuracy.
Airport flying area construction is a complex dynamic process. Its typical features including: complex construction process, large construction area, underground pipe trench interwoven and so on. Traditional construction schedule management of airport flying area is based on Gantt charts and network diagrams, which is generated before the construction, not supporting real-time updates. A preliminary exploration of BIM-based schedule management in airport flying area engineering is conducted. Using Civil3D,Revit, Navisworks and MS Project software, the construction image progress model can be established. Manager also can achieve laying on the type of runway, the number of layers, daily progress charts and updates, and to achieve global control so as to improve management efficiency and management quality.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.