Journal ArticleDOI
Hydration kinetics and microstructure development of Ultra-High Performance Concrete (UHPC) subjected to microwave pre-curing
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TLDR
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. read more
Citations
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Influence of different curing methods on the compressive strength of ultra-high-performance concrete: A comprehensive review
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.
Journal ArticleDOI
Absorption-desorption process of internal curing water in ultra-high performance concrete (UHPC) incorporating pumice: From relaxation theory to dynamic migration model
TL;DR: In this paper , the absorption-desorption process of internal curing water by pumice in ultra-high-performance concrete (UHPC) system based on relaxation theory is clarified.
Journal ArticleDOI
A low-carbon alkali activated slag based ultra-high performance concrete (UHPC): Reaction kinetics and microstructure development
TL;DR: In this article , a low-carbon alkali activated slag-based ultra-high performance concrete (A-UHPC) with ultra-low moisture content is developed, which can meet the requirement of high performance and low CO2 emission simultaneously.
Journal ArticleDOI
Multiple effects of particle size distribution modulus (q) and maximum aggregate size (Dmax) on the characteristics of Ultra-High Performance concrete (UHPC): Experiments and modeling
TL;DR: In this article , the multiple effect of typical parameters ( q value and D max ) on the properties of UHPC are clearly clarified based on mechanical property evaluation, wet packing density, low-field NMR and X-ray computed tomography (X-CT).
Journal ArticleDOI
Precise mix-design of Ultra-High Performance Concrete (UHPC) based on physicochemical packing method: From the perspective of cement hydration
TL;DR: In this article , a physicochemical packing method was adopted to optimize the mix-design of UHPC through establishing a new equivalent particle size distribution of hydrated cement by applying a multilayer spherical shell model.
References
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Journal ArticleDOI
Microwave processing: fundamentals and applications
Erik T. Thostenson,Tsu-Wei Chou +1 more
TL;DR: In this paper, the fundamentals of electromagnetic theory, dielectric response, and applications of microwave heating to materials processing, especially fiber composites, are reviewed in this article, and a knowledge of electromagnetic theories and dielectrics is essential to optimize the processing of materials through microwave heating.
Journal ArticleDOI
Microwave versus conventional sintering: A review of fundamentals, advantages and applications
Morteza Oghbaei,Omid Mirzaee +1 more
TL;DR: Microwave sintering has emerged as a new method for sinterding a variety of materials that has shown significant advantages against conventional sinterging procedures as mentioned in this paper. But microwave sinterings are not suitable for all materials.
Journal ArticleDOI
Microwave energy for mineral treatment processes—a brief review
TL;DR: In this article, a brief account of results generated from microwave-assisted mineral treatments tests is given, which demonstrate that microwave energy has potential in mineral treatment and metal recovery operations such as heating, drying, carbothermic reduction of oxide minerals, leaching, roasting/smelting, pretreatment of refractory gold ore and concentrate, spent carbon regeneration and waste management.
Journal ArticleDOI
A review on ultra high performance concrete: Part I. Raw materials and mixture design
TL;DR: In this article, the theoretical principles, raw materials, mixture design methods, and preparation techniques for UHPC are reviewed, including reduction in porosity, improvement in microstructure, enhancement in homogeneity, and increase in toughness.
Journal ArticleDOI
Optimization of ultra-high-performance concrete by the use of a packing model
F. de Larrard,Thierry Sedran +1 more
TL;DR: In this article, the authors presented two models allowing to predict the packing density of a particle mix, derived from the Mooney's suspension viscosity model, and made a selection of mixes with the help of the Solid Suspension Model, and tests are performed in order to verify that the mix obtained is definitely optimal.
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