The Friction and Dilatancy Angle of Recycled Concrete Aggregate

3rd World Multidisciplinary Civil Engineering, Architecture, Urban Planning Symposium

土木建筑工程;文学

Gluchowski, Andrzej^1 ; Miturski, Maciej^2 ; Sas, Wojciech^1

Warsaw University of Life Sciences, Faculty of Civil and Environmental Engineering, Water Centre - Laboratory, Nowoursynowska 166 ST, Warsaw

02-787, Poland^1

Warsaw University of Life Sciences, Faculty of Civil and Environmental Engineering, Department of Geotechnical Engineering, Nowoursynowska 166 ST, Warsaw

02-787, Poland^2

关键词: Construction and demolition;    Direct shear test;    Moisture conditions;    Physical and mechanical properties;    Recycled concrete aggregates;    Recycled materials;    Road engineering;    Standard test condition (STC);   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/471/4/042023/pdf
DOI  :  10.1088/1757-899X/471/4/042023

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

Recycled Concrete Aggregate (RCA) is a construction and demolition material, which in unbound state can be placed as subbase in road structures. Over last decades there was many investigations which highlighted physical and mechanical properties of this material. Nevertheless, successful application of RCA still needs more tests. For sustainable development of road engineering, utilization of recycled material is essential. In this article direct shear tests were performed to characterize mechanical properties of RCA. Direct shear tests were conducted with and without modification by adding metal frames to shear cubic shaped box with length of side equal 250mm. Material used in this paper was RCA in gradation with lead to recognize it as sandy gravel. Tests were performed for various moisture content material compacted with to respect of normal energy in Proctor method. Tests shows differences between direct shear with and without metal frames. For RCA tested in standard test conditions friction angle differs between 32.4° to 65.1°. Modification of test equipment results in friction angle equal 38.7° to 41.5°. Both tests indicated impact of moisture conditions during compaction. In this study, dilation angle analysis was also performed. Dilation angle values were in range from 5° to 10°. Brittle nature of RCA results in low value of the dilatancy index.