摘要
首先建立了2D和3D碳化测试方法,在此基础上系统研究了粉煤灰混凝土在加速碳化试验中2D和3D碳化深度的依时变化规律,探讨了粉煤灰掺量(0%,10%,20%,40%,60%)、粉煤灰种类(Ⅰ级、Ⅱ级)、水胶质量比(0.3,0.35,0.4)、胶凝材料用量(458,380kg/m3)、养护龄期(28,90d)5个重要因素对粉煤灰混凝土2D和3D碳化深度的影响规律.另外,还将2D和3D碳化试验结果与同条件下1D碳化进行了定量比较,发现2D和3D碳化明显存在交互作用,为量化该交互作用提出了2D和3D碳化交互系数概念,并给出了2D和3D碳化交互系数随时间变化的数学表达式.以期为准确预测实际混凝土结构在真实状态下碳化寿命提供科学依据.
A method used to measure the carbonation depth at 2 and 3 dimensional （2D, 3D） CO2 flow is developed in this paper. Using this method, 2D and 3D carbonation depth at different carbonation age are systematically investigated for concretes with different fly ash percentage （0%, 10%, 20%, 40%, 60% ）, types of fly ash （ grade Ⅰ, grade Ⅱ ）, water to binder ratios （ 0. 3, 0. 35, 0. 4）, amount of binders （458, 380 kg/m^3 ） , and curing ages （28, 90 d）. In addition, a comparison is made with 1D carbonation testing results. An interaction effect caused by 2D and 3D carbonation can obviously be observed through the comparison. In order to quantify the interaction effect, 2D and 3D carbonation interaction coefficients are proposed in this paper. Finally, the changes of 2D and 3D carbonation interaction coefficients with time are given. The above research provides an insight into the carbonation attack on the edge and comer reinforcing bars of concrete structures in the field of civil engineering.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第4期562-567,共6页
Journal of Southeast University：Natural Science Edition
基金
江苏省重大工程资助项目(STDQ-04HT20SY-010)
南京水利科学研究院开放流动研究基金资助项目(Yk90508)
武汉理工大学硅酸盐材料工程教育部重点实验室开放基金资助项目(SYSJJ2004-02)
关键词
粉煤灰
混凝土
碳化
二维
三维
交互作用
fly ash
concrete
carbonation
2 dimension （2D）
3 dimension （3D）
interaction
