Self-cementing properties of crushed demolished concrete in unbound layers: results from triaxial tests and field tests |
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| Authors: | Arm M |
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| Institution: | 1. Thrombosis and Atherosclerosis Research Institute;2. McMaster University;1. School of Civil Engineering, Xi''an University of Architecture and Technology, Xi''an 710055, PR China;2. Highway School, Chang’an University, Xi’an, Shaanxi 710064, PR China;3. Department of Civil Engineering and Environmental Engineering, Rutgers, the State University of New Jersey, Piscataway, NJ 08854, USA;1. Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education (Harbin Institute of Technology), Harbin 150090, China;2. School of Civil Engineering, Harbin Institute of Technology, Heilongjiang, Harbin 150090, China;3. Tianjin University Research Institute of Architectural Design and Urban Planning, Tianjin 300073, China;1. College of Engineering and Science, Victoria University, Melbourne, Victoria 3011, Australia;2. Institute of Sustainable Industries & Liveable Cities,Victoria University, Melbourne, Victoria 3011, Australia;3. School of Engineering, RMIT University, Melbourne, Australia;1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China;2. Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN 37996, USA |
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| Abstract: | A 2-year study is underway to evaluate the expected growth in stiffness in layers of crushed concrete from demolished structures. This growth is said to be a result of self-cementing properties. The study consists of repeated load triaxial tests on manufactured specimens after different storing time together with falling weight deflectometer, FWD, measurements on test sections. Results so far show a clear increase with time in resilient modulus and in back-calculated layer modulus for all concrete materials. The increase is the largest in the first months and then diminishes. The field measurements show a more considerable growth in stiffness than the laboratory tests, with a doubled value two years after construction. Comparative investigations on natural aggregates, mostly crushed granite do not show any growth in stiffness, neither in the laboratory nor in the field. Consequences for the choice of design modulus are discussed. |
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