Predicting carbonation in early-aged cracked concrete
Predicting carbonation in early-aged cracked concrete
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DOI：
10.1016/j.cemconres.2005.12.019
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发表时间：
2006-05-01
影响因子：
11.4
通讯作者：
Park, Chan-Kyu
中科院分区：
文献类型：
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作者：
Song, Ha-Won;Kwon, Seung-Jun;Park, Chan-Kyu
开裂混凝土中的碳化被认为是加速钢筋混凝土结构钢筋锈蚀的主要劣化因素之一。对于耐久混凝土结构，有必要通过对早期混凝土结构进行抗裂评估来控制混凝土中的裂缝，但早期混凝土往往不可避免地会出现裂缝。这些裂缝成为CO2渗入混凝土内部的主要途径，从而加速了裂缝混凝土的碳化。在本研究中，为了同时考虑孔隙水在完好混凝土和裂缝混凝土中的扩散，提出了一种早期裂缝混凝土碳化预测的分析方法。然后，采用多组分水化热模型和微孔结构形成模型进行有限元分析，研究了早期混凝土碳化过程中的扩散特性。利用推导出的扩散系数，考虑溶解二氧化碳的反应，模拟了完好混凝土和有裂缝混凝土的碳化行为。最后，对3种不同水灰比(45%、55%和65%)、不同裂缝宽度的裂缝混凝土进行了数值计算，并与试验结果进行了比较。(C)2005爱思唯尔有限公司。保留所有权利。
Carbonation in cracked concrete is considered as one of major deteriorations accelerating steel corrosion in reinforced concrete structures. For durable concrete structures, it is necessary to control crack in concrete through crack resistance evaluation for early-aged concrete structures, but often unavoidable cracks in early-aged concrete may occur. These cracks become a main path for CO2 penetration inside concrete so that the carbonation is accelerated in cracked concrete.In this study, an analytical technique for carbonation prediction in early-aged cracked concrete was developed for considering both CO2 diffusion of pore water in sound concrete and in cracked concrete. Then, characteristics of diffusivity on the carbonation in early-aged concrete are studied through finite element analysis implemented with the so-called multi-component hydration heat model and micro-pore structure formation model. The carbonation behaviour in sound concrete and cracked concrete are also simulated by using the derived diffusivity with consideration of reaction with dissolved CO2. Finally, numerical results obtained for cracked concrete made with 3 different W/C ratios (45%, 55%, and 65%) with different crack widths were compared with experimental results. (C) 2005 Elsevier Ltd. All rights reserved.