Author
Yuan Yuan
Bio: Yuan Yuan is an academic researcher from Xi'an University of Architecture and Technology. The author has contributed to research in topics: Aggregate (composite) & Concrete recycling. The author has an hindex of 2, co-authored 11 publications receiving 19 citations.
Papers
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TL;DR: A comprehensive review of the scientific and technical achievements of microwave-assisted concrete treatment can be found in this article, where the theoretical fundamentals for the microwave assisted concrete heating process are investigated in detail, covering areas such as the microwave heating characteristics, governing equations, dielectric properties and multi-field coupling effects.
35 citations
TL;DR: In this paper, the authors investigated the fracture behavior of commonly used coarse aggregates: granite and basalt were investigated by microwave heating tests and found that basalt fracture occurred with more damage at higher power level.
11 citations
TL;DR: In this paper, the authors focus on crack propagation behavior and hence apply microwave heating technique in assisting rocks breakage and recycling coarse aggregate in waste concrete, which is highly promising in assisting rock breakage.
Abstract: Application of microwave heating technique is highly promising in assisting rocks breakage and recycling coarse aggregate in waste concrete. This work focus on crack propagation behavior and hence ...
8 citations
TL;DR: In this article, a multi-field model is established to simulate the microwave heating process of concrete specimen with single-particle aggregate by using of COMSOL multiphysics, which is verified by comparison with temperature from experiment.
Abstract: Due to the potential for significant process benefit, microwave assisted concrete recycling is highlighted by many scholars and engineers over the world recently. In this paper, a multi-field model is established to simulate the microwave heating process of concrete specimen with single-particle aggregate by using of COMSOL Multiphysics. The validation of this model is verified by comparison with temperature from experiment. Mechanical properties of aggregate-mortar interface during microwave heating process was experimentally investigated. Electric, temperature, stress field evolution and moisture transformation during microwave heating process are discussed in detail. Temperature and stress gradient at mortar-aggregate interface influenced by microwave heating power, frequency and duration are analyzed and graphically presented, which are the dominant factors to achieve the interface debonding. Based on the comparison between concrete absorbed energy and temperature variation, energy efficiency for microwave heating concrete is also briefly discussed. Results of this investigation could provide a multi-field understanding for the microwave treatment on concrete.
8 citations
TL;DR: In this article, a series of experiement is presented for microwave-assisted concrete liberation and aggregate recycling is highlighted by many research groups due to its efficient and effective recycling process.
Abstract: Microwave-assisted concrete liberation and aggregate recycling is highlighted by many research groups due to its efficient and effective recycling process. In this paper, a series of experi...
7 citations
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TL;DR: In this paper , the micro-structural characteristics of the loess specimens that are exposed to acetic acid or sodium sulfate, are studied using scanning electron microscopy, X-ray diffraction, and energy dispersive spectroscopy analyses.
Abstract: When exposed to chemicals, the micro-structural evolution of the loess and the impacts on the macro-mechanical properties are considered crucial for contaminated land reclamation. In this study, the micro-structural characteristics of the loess specimens that are exposed to acetic acid or sodium sulfate, are studied using scanning electron microscopy, X-ray diffraction, and energy dispersive spectroscopy analyses. Further, their macro-mechanical properties are determined by direct shear tests. The corrosion of the cement between particles under acetic acid environments and the salt-induced swelling under saline conditions play an important role in the micro-structural deterioration. The cohesion and friction angle for the wetted loess are about 16 kPa and 19° respectively, while for the acetic acid-contamianted loess, they reduce to 10 kPa and 15° respectively. They, for the sodium sulfate-contaminated loess, reduce further to below 10 kPa and 13° respectively. The macro-mechanical properties show good correspondence with the micro-structural deterioration.
38 citations
36 citations
TL;DR: In this article , the intrinsic effect of microwave pre-curing on the hydration kinetics and microstructure development of UHPFRCs is investigated. And the observed experimental results show that the microwave treatment can create a dense shell around the cured UHPC's periphery, which can resist the lateral deformation of the specimen and guarantee the excellent mechanical properties of the treated sample.
Abstract: This research aims to clarify the intrinsic effect of microwave pre-curing on the hydration kinetics and microstructure development of Ultra-High Performance Concrete (UHPC). Six hours after casting, the UHPC samples are subjected to microwave pre-curing for 60–240 s. Then, the macro and micro characteristics of the cured UHPC are evaluated. The observed experimental results show that the microwave treatment can create a dense shell around the cured UHPC's periphery, which can resist the lateral deformation of the specimen and guarantee the excellent mechanical properties of the treated sample. Moreover, when steel fibres are included into UHPC, the reflection and shielding effect of the 3D fibres network can significantly block the promotion effect of microwave on the strength development of UHPFRC. Additionally, due to the high energy of microwave, high polymerization hydration products and advanced pore structure (micro and meso scales) can be observed in the pre-cured UHPC.
25 citations
TL;DR: In this paper , a comprehensive study of the different effects of different curing methods on the strength development of normal concrete and UHPC is presented. But, it is not practical to specify the peak curing regimes for concrete or UHC since the best results need critical monitoring of curing parameters.
25 citations
TL;DR: In this article , the most commonly used curing regimes for AAMs are conducted in thermal or ambient temperature environments, adopted in the form of immersion of the AAM in water, ambient and high humidity, sealing, oven and, more recently, microwave curing.
23 citations