Searched for: subject%3A%22diffusion%22
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Li, Mingqi (author), Chen, Huisu (author), Lin, Jianjun (author)
Porous networks provide the main transport channels to the active media, which will damage the microstructure and then lead to a subsequent reduction in the strength, serviceability and aesthetic of porous materials. The connectivity of the porous network plays an essential role in the transport properties of these active media. In statistic...
conference paper 2021
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Zhao, Lixiao (author), Feng, Pan (author)
Chloride diffusion in concrete is one of the key parameters of durability design for structure. Existing methods of reducing the chloride diffusion such as decreasing water-cement ratio and adding mineral admixtures often lead to increase the risk of concrete cracking. In this study, we focused on mitigating the permeation of chloride ions in...
conference paper 2021
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Cao, Yuanzhang (author), Guo, Liping (author)
The chloride and sulfate exist together in real environment, no matter marine or salts lakes, and the ratio of the chloride to sulfate is varied. To precisely predict the concrete durability under real environment, this paper mainly investigated the influence of sulfate on chloride ions diffuse into hardened cement paste. The Minitab software...
conference paper 2021
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Kunz, Philipp (author), Mechtcherine, Viktor (author)
Strain-hardening cement-based composites (SHCC) are high-performance fiber-reinforced composites with promising durability properties due to their considerably enhanced crack control under tensile load conditions. The knowledge of the transport properties of such composites in cracked state are crucial for estimating their durability...
conference paper 2021
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Boutz, M.M.R. (author), Van Der Wegen, G.J.L. (author), Sarabèr, A.J. (author)
The time dependency of the chloride diffusion coefficient, the so-called ageing coefficient, of fly ash concrete has been investigated. The effect of origin of the fly ash as well as the origin and strength level of the cement combined with the fly ash, has been determined. Results obtained using the RCM-method on samples aged up to 5 years...
conference paper 2021
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Kamat, Ameya (author), Abbas, Yawar (author), Blagojević, Andrija (author), van Casteren, Toine (author), Walraven, Joost (author)
Service life of concrete infrastructure is severely compromised because of chloride-induced corrosion and measuring the chloride content is crucial to determine the remaining service life. DuraCrete provides a chloride ingress model based on Fick’s 2nd law. Although the diffusion coefficient is modelled as a time-dependent variable, the...
conference paper 2021
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Zhang, Jingxiao (author), Ma, Yuwei (author), Zheng, Jiazheng (author)
The widespread application of alkali-activated fly ash/slag (AAFS) concrete requires satisfaction of a series of performance criteria both from its early age properties (e.g. workability, strength) and long-term stability. In this study, long-term (till 180 days) natural chloride diffusion tests were conducted to evaluate the chloride diffusion...
conference paper 2021
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Zhang, H. (author), Schlangen, E. (author), Ge, Z. (author), Šavija, B. (author)
Properties of concrete are, to a large extent, dependent on the properties of its binding constituent, hydrated cement paste. Therefore, knowledge of properties of hydrated cement paste is crucial for predicting concrete behaviour. This paper presents an experimentally informed approach for modelling elastic and transport properties of cement...
conference paper 2021
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Zuo, Chenjia (author), Liu, Yu (author), Liu, Yanbo (author)
Transport of chlorides is one of the most critical factors determining the service life of concrete structures under ocean environments, and diffusion is usually regarded as the major mechanism for the transport of chloride ions into concrete. As chloride diffusivity is affected by temperature, most existing service life prediction models use...
conference paper 2021
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Zhao, Jiaqi (author), Fan, Zhihong (author), Xiong, Jianbo (author)
The error function solution of Fick’s second law assumes the constant surface chloride concentration, when it is used to calculate the apparent average chloride diffusion coefficient in concrete during the exposure period. However, the surface chloride concentration in concrete often vary with time. The purpose of this study is to investigate...
conference paper 2021
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Ferjaoui, Khalil (author), Georget, Fabien (author), Scrivener, Karen (author)
To reduce the CO2 footprint of construction materials, concrete producers blend their cement with Supplementary Cementitious Materials (SCMs). And even though such blended systems are eco-friendlier than the Ordinary Portland Cement (OPC), they are required to respect standards. In this context, understanding and predicting the durability of...
conference paper 2021
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Zhang, Zhidong (author), Angst, Ueli M. (author)
The structure of concrete, in particular the microstructure of the steel-concrete interface (SCI), can significantly affect corrosion of rebars. To support corrosion, oxygen needs to diffuse from the ambient environment to the steel surface. Meanwhile, corrosion products transport through the SCI and precipitate in concrete. Transport properties...
conference paper 2021
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Larm Teye, Alfred (author), Ahelegbey, Daniel Felix (author)
Following the 2007-08 Global Financial Crisis, there have been a growing research interest on the spatial interrelationships between house prices in many countries. This paper examines the spatio-temporal relationship between house prices in the twelve provinces of the Netherlands using a recently proposed econometric modelling technique called...
conference paper 2017
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Maruoka, D. (author), Nanko, M. (author)
Abstract only.
conference paper 2013
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Lees, T. (author), Sexton, M. (author)
The UK has set a target for a reduction in CO2 emissions by 80% by 2050 compared to 1990 levels. The domestic sector accounts for 25% of UK emissions from the generation of heat and electricity for homes. For this sector to move to a low-carbon path, it will need to transform the environmental performance of housing. The transformation will...
conference paper 2011
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Mlecnik, E. (author)
This study examines opportunities for the emergence of SME networks regarding highly energy-efficient housing, as well as the barriers they face. A theoretical innovation diffusion model is developed from the point-of-view of social and environmental entrepreneurship and sustainable consumption. The qualitative analysis reflects key elements...
conference paper 2011
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Zilahy, G. (author), Széchy, A. (author)
The chemical industry is considered as one of the most important sectors from an environmental point of view. As a result, many chemical companies have been at the forefront of both using innovative technologies and up-to-date environmental management practices. However, the sector faces an ever increasing pressure from its stakeholders and...
conference paper 2010
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Jing, H. (author), Li, C. (author), Zhou, B. (author)
In this paper, some five-point finite difference schemes for steady convection-diffusion problems are presented. To begin with, we use the finite volume method (FVM) to discretize the convection-diffusion equation. After that, we present two five-point difference schemes for the approximation of the first order derivatives on faces, one of which...
conference paper 2006
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Cnossen, J.M. (author), Bijl, H. (author), Gerritsma, M.I. (author), Koren, B. (author)
For goal-oriented model adaptation a model-error estimator is required to drive the adaptation process. In recent years publications have appeared on the dual-weighted residual (DWR) method in the application of model-error estimation in output functionals. In this paper we study the application of the DWR method for convection-diffusion...
conference paper 2006
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Van Veldhuizen, S. (author), Vuik, K. (author), Kleijn, C.R. (author)
In this study various numerical schemes for simulating 2D laminar reacting gas flows, as typically found in Chemical Vapor Deposition (CVD) reactors, are proposed and compared. These CVD systems are generally modeled by means of many stiffly coupled elementary gas phase reactions between a large number of reactants and intermediate species. The...
conference paper 2006
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