دانلود رایگان مقاله لاتین مدل سازی عددی مواد از سایت الزویر
عنوان فارسی مقاله:
مدل سازی عددی مواد مبتنی بر سیمان متخلخل توسط پلیمر ابر جاذب
عنوان انگلیسی مقاله:
Numerical modelling of porous cement-based materials by superabsorbent polymers
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
The design of porous cement-based materials establishes a challenge to obtain light materials while maintaining high technical performance. Superabsorbent polymers (SAP) can bring great flexibility to the design of porous cement-based materials, allowing to tailor the pore structures thanks to a basic knowledge of the absorbency of the polymer. The specific morphology of the resultant pores has a high potential of improving the mechanical performance of low density cement-based materials. Nevertheless, the design of these materials, as with other composite materials, requires a costly experimental development plan in order to establish the dosages that will provide the required material properties. In this process, the use of micromechanical models can complement the experimental tasks predicting the final properties of the heterogeneous material, thus reducing the required experimental effort in favour of the development of the material. Continuum micromechanical models offer a framework to analyse the behaviour of heterogeneous materials. The underlying idea behind continuum micromechanics is that it is possible to separate aheterogeneous material into phases with on-average constant material properties. According to this concept, the main goal of micromechanics is predicting the response of a heterogeneous material on the basis of the geometries, volume fractions and properties of the individual phases (homogenisation). These models can be roughly classified as analytical or numerical (computational). From a theoretical perspective, analytical micromechanical models are based on important assumptions and simplifications that limit their applicability to simple material systems. Other analytical approaches are based on mathematical regressions over empirical data, therefore having a less meaningful physical background. In order to overcome part of these limitations, the computational approaches are feasible alternative tools to be used in the design of composite materials. They allow to analyse more complex morphologies and to model non-linear constituents behaviour while providing a simpler way to account for localized deformation and failure mechanisms [1]. One of the most commonly used computational approaches is based on the Finite Element Method (FEM), where a representative volume element (RVE) is built reproducing the morphology of the constituents and the appropriate material models assigned to each phase [2–5] . The prediction of the homogenised material behaviour is obtained subjecting this RVE to a load state, normally under pure uniaxial tensile or compression load or shear load. Theaccuracy of this prediction will depend on the exactitude of the modelled morphology, material model considered for each constituent, boundary conditions and mesh size. Analytical and numerical micromechanical models have been applied to the prediction of the effective properties of different types of composites (mainly metallic and plastic composites), including cement-based materials as described below.
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کلمات کلیدی:
Self-sealing cement-based materials using superabsorbent polymers www.rilem.org/gene/main.php?base=500218&id_publication=78&id_papier... by HXD Lee - 2010 - Cited by 23 - Related articles Abstract: Superabsorbent polymers (SAP) have the potential to be used as an admixture to enhance the self-sealing of cracks in cement-based materials such ... Self-sealing of cracks in cement-based materials using ... www.imperial.ac.uk/structural-engineering/...materials/superabsorbent-polymers/ Self-sealing of cracks in cement-based materials using superabsorbent polymers. H.X.D. Lee, H.S. Wong & N.R. Buenfeld. Concrete in service tends to crack as ... Numerical modelling of porous cement-based materials by ... www.european-coatings.com/...materials.../Numerical-modelling-of-porous-cement-base... Oct 12, 2016 - The development of new cementitious materials raises new ... One of the potential applications of superabsorbent polymers (SAP) is to deliver ... Numerical modelling of porous cement-based materials by ... - DTU Orbit orbit.dtu.dk/.../numerical-modelling-of-porous-cementbased-materials-by-superabsor... One of the potential applications of superabsorbent polymers (SAP) is to deliver ... interesting for the development of porous cement-based materials with high ... [PDF]Water-entrained cement-based materials by superabsorbent polymers ... orbit.dtu.dk/.../2010_Int.%20RILEM%20Conf.%20Lyngby,%20Denmark%20LPE-2.... by LP Esteves - Cited by 8 - Related articles Jan 29, 2017 - Water-entrained cement-based materials by superabsorbent polymers: On the fundamentals…. Paper presented at International RILEM ... Self-Healing Phenomena in Cement-Based Materials: State-of-the-Art ... https://books.google.com/books?isbn=9400766246 Mario de Rooij, Kim Van Tittelboom, Nele De Belie - 2013 - Technology & Engineering 324–325 (2011) Dennis Lee, H.X., Wong, H.S., Buenfeld, N.: Self-sealing cement-based materials using superabsorbent polymers. In: Jensen, O.M., Hasholt, ... Use of Superabsorbent Polymers in Concrete - CiteSeerX citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.939.7070&rep=rep1&type... by OM Jensen - 2013 - Cited by 41 - Related articles Its presence in hardened concrete influences strength ... offered by the use of superabsorbent polymers (SAPs) for .... structure of cementitious materials. During ...
