[1]张云升,孙伟,陈树东,等.弯拉应力作用下粉煤灰混凝土的1D和2D碳化[J].东南大学学报(自然科学版),2007,37(1):118-122.[doi:10.3969/j.issn.1001-0505.2007.01.025]
 Zhang Yunsheng,Sun Wei,Chen Shudong,et al.1D and 2D carbonation of fly ash concrete under flexural stress[J].Journal of Southeast University (Natural Science Edition),2007,37(1):118-122.[doi:10.3969/j.issn.1001-0505.2007.01.025]
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弯拉应力作用下粉煤灰混凝土的1D和2D碳化()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
37
期数:
2007年第1期
页码:
118-122
栏目:
材料科学与工程
出版日期:
2007-01-20

文章信息/Info

Title:
1D and 2D carbonation of fly ash concrete under flexural stress
作者:
张云升 孙伟 陈树东 郭飞 赵庆新
东南大学材料科学与工程学院, 南京 211189
Author(s):
Zhang Yunsheng Sun Wei Chen Shudong Guo Fei Zhao Qingxin
School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
关键词:
粉煤灰 混凝土 应力 碳化 二维
Keywords:
fly ash concrete stress carbonation 2 dimensions
分类号:
TU528
DOI:
10.3969/j.issn.1001-0505.2007.01.025
摘要:
首先建立了弯拉应力作用下混凝土的1D和2D碳化测试方法,在此基础上系统研究了粉煤灰混凝土在弯拉应力水平分别为0.0,0.20,0.35,0.50,0.65,0.80作用下1D和2D碳化深度的依时变化规律,并探讨了粉煤灰掺量(0%,10%,20%,40%,60%,质量分数)、粉煤灰种类(Ⅰ,Ⅱ级)、水胶比(0.3,0.35,0.4,质量比)、胶凝材料用量(458,380 kg/m3)、养护龄期(28,90 d)5个重要因素对处于弯曲应力状态下的粉煤灰混凝土1D和2D碳化深度的影响规律.另外,还将不同弯拉应力水平(σS)下的碳化试验结果与同条件下无应力状态下的碳化进行了定量比较,发现弯拉应力水平对碳化存在明显的加速作用,为量化该交互作用提出了应力加速因子(KσS)概念,研究表明KσSσS的增加而变大,符合指数函数KσS=1+kσCS.
Abstract:
A method used to measure the carbonation depth at 1 and 2 dimensional(1D, 2D)CO2 flow of concrete under flexural stress is developed in this paper. Using this method, 1D and 2D stress-carbonation depth at different carbonation age were systematically investigated for fly ash concretes made of different cement replacement percentage by fly ash(0%, 10%, 20%, 40%, 60%), different types of fly ash(grade Ⅰ, grade Ⅱ),different water to binder ratios(0.3, 0.35, 0.4), different amount of binders(458, 380 kg/m3), and different curing ages(28, 90 d). In addition, a comparison was made between stress-carbonation and no stress-carbonation testing results. A carbonation accelerating effect caused by external flexural stress can obviously be observed through the comparison. In order to quantify the stress accelerating effect, stress accelerating factor(KσS)is proposed. The relationship between KσSand σS(external stress-to-ultimate stress ratio)is given, which is in agreement with exponential function KσS=1+kσCS.

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备注/Memo

备注/Memo:
基金项目: 江苏省自然科学基金资助项目(BK2006555)、交通部西部交通科技重点资助项目(2006ZB12)、江苏省重大工程资助项目(STDQ-04HT20SY-010).
作者简介: 张云升(1974—),男,博士,副教授,zhangys279@163.com.
更新日期/Last Update: 2007-01-20