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Model of Chloride Penetration Concrete under the Drying and Wetting Cycles Coupled with Load

Author: PengZhi
Tutor: JinXianYu
School: Zhejiang University
Course: Structural Engineering
Keywords: Durability of Concrete Chloride ion Wet and dry cycle Load Theoretical model Moisture diffusion surface factor
CLC: TU528
Type: Master's thesis
Year: 2010
Downloads: 287
Quote: 3
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Abstract


The durability of concrete structures is the issue of universal concern of today's engineering community . Alternating wet and dry area of concrete by chloride ions serious erosion , chloride ion erosion model ignores past loads and inconsistent with the actual . In this paper, this problem of non- saturation concrete chloride ion erosion model , the surface of the concrete moisture diffusion factor and load the chloride ion erosion . Thesis research are: (1 ) starting from the basic physical processes , introduced the basic theory of diffusion and convection ; consider the role of concrete pore solution convection and chloride ion concentration diffusion coupled with chloride ions in non- saturated concrete transport model , and the finite difference method to solve the model calculations ; design test study of wet and dry cycle of the influence of chloride ion penetration test results good correlation with the model results . (2) , dried in a wet and dry cycle boundary conditions affected by the environment and is difficult to determine . Moisture diffusion surface factor is a key factor in the analysis of concrete humidity field drying process . This article introduced the two parameters of the moisture in the concrete surface pore area and pore diffusion coefficient derived the concrete humidity field boundary conditions ; simplified to the concrete surface moisture convection-diffusion incompressible fluid one-dimensional flat panel wall face of convective mass transfer problems, according to the quality Conservative peace siding face of the theory of convective mass concrete drying process, the moisture diffusion surface factor theoretical model , given the approximate solution of the model . The test results show that the theoretical models and experimental results are in good agreement . ( 3 ) analysis of the loading affect chloride ion erosion mechanism of concrete ; through to load concrete pore loads impact of the concrete average pore size and pore size distribution , the establishment of the chloride ion erosion loads concrete model . Finally , the design of concrete material under load chloride ion penetration test, analyze test results , test the theoretical model the same conclusion . This thesis has been the National Natural Science Foundation of China ( 50838008 ) , National Key Basic Development Program (2009CB623200), Ministry of Education, Fund for the Doctoral project ( 20070335087 ) funded .

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CLC: > Industrial Technology > Building Science > Building Materials > Non-metallic materials > Concrete and concrete products
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