نوع مقاله : مقاله پژوهشی
نویسندگان
1 استاد، دانشکده مهندسی عمران، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران
2 گروه مهندسی عمران، واحد سمنان، دانشگاه آزاد اسلامی، سمنان، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Concrete pavements are commonly used in some areas of airfields such as aprons. Repairing these pavements is costly and time-consuming, and it also disrupts flight operations. The use of concrete block pavement is a more suitable option at aprons. Fewer studies have been done on this type of pavement in the airfields than on roads. For further studies, the performance of this pavement was examined by making a 3D model and a test track with dimensions of 2m×2m. This sample was composed of subgrade, subbase, base and Cement-Treated Base(CTB) layers, with 15cm thickness, for each layer, bedding sand with 3cm thickness and a Unipave-shape (zig-zag) concrete block pavers with 8cm thickness and herringbone pattern. Then their quality was controlled, based on Federal Aviation Administration(FAA) regulation. At the next step, Plate Load Test (PLT), was conducted on this sample. For this purpose, a setup including a concrete foundation and a reaction beam was built. For the first time in related research, several 3D models of concrete block with all its angles and corners representing their actual dimensions were made using ABAQUS software. Then the force-deflection curve, as a guidance chart was presented. The 3D model analysis result showed that the elastic modulus of the concrete block surface could be taken into account at 2000 MPa to achieve the most coordination between finite element analysis and PLT results. Also the Pull-Out test results showed that using Portland cement in the jointing sand improved its performance against the Pull-Out force by about 2 times as the sample with lime in the jointing sand mixture.
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