Analysis of the behavior of ultra high performance concrete at early age |
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| Affiliation: | 1. Department of Civil and Environmental Engineering, Northwestern University, 2145 Sheridan Rd. A120, Evanston, IL, 60208, USA;2. Christian Doppler Laboratory LiCRoFast, Department of Civil Engineering and Natural Hazards, University of Natural Resources and Life Sciences (BOKU), Vienna, Austria;3. Department of Architecture and Civil Engineering, Shanghai Normal University, 100 Haisi Rd. Fengxian District, Shanghai, PR China;4. Department of Civil and Environmental Engineering, Northwestern University, 2145 Sheridan Rd. A123, Evanston, IL, 60208, USA;1. Institute of Infrastructure, Engineering, Sustainable and Management (IIESM), UiTM Shah Alam, Selangor, Malaysia;2. Faculty of Civil Engineering, Universiti Teknologi MARA (UiTM), Shah Alam, Selangor, Malaysia;1. Christian Doppler Laboratory, University of Natural Resources and Life Sciences, Vienna, Austria;2. Dept. of Civil and Environmental Engineering, Politecnico di Milano, Milan, Italy;3. Dept. of Mechanics, Faculty of Civil Engineering, Czech Technical University in Prague, Czech Republic;1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, PR China;2. Department of the Built Environment, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands;1. Division of Construction Computation, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam;2. Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam;3. Faculty of Civil and Environmental Engineering, Institute of Structural Engineering, University of Kassel, Kurt-Wolters-Straβe 3, 34125 Kassel, Germany |
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| Abstract: | Ultra high performance concretes (UHPCs) are cementitious composite materials with high level of performance characterized by high compressive strength, high tensile strength and superior durability. These are reached by a low water-to-binder ratio, optimized aggregate size distribution, thermal activation, and fiber reinforcement. In the past couple of decades, more and more UHPCs have been developed and found their ways into practice. Thus, the demand for computational models capable of describing and predicting relevant aging phenomena to assist design and planning is increasing. This paper presents the early age experimental characterization as well as the results of subsequent simulations of a typical UHPC matrix. Performed and simulated tests include unconfined compression, splitting (Brazilian), and three-point-bending tests. The computational framework is constructed by coupling a hygro-thermo-chemical (HTC) theory and a comprehensive mesoscale discrete model with formulated aging functions. The HTC component allows taking into account various types of curing conditions with varying temperature and relative humidity and predicting the level of concrete aging. The mechanical component, the Lattice Discrete Particle Model (LDPM), permits the simulation of the failure behavior of concrete at the length scale of major heterogeneities. The aging functions relate the mesoscale LDPM mechanical properties in terms of aging degree, defined in this work as the ratio between the quasi-static elastic modulus at a certain age and its asymptotic value. The obtained results provide insights into UHPC early age mechanisms yielding a computational model for the analysis of aging UHPC structures. |
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| Keywords: | UHPC Lattice discrete particle model Early age Hygro-thermo-chemical model |
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