不同拉应力水平下循环再生细骨料混凝土碳化行为研究  

Recycled fine aggregate concrete carbonation behavior research under different tensile stress

作　　者：封金财[1] 高燕蓉 朱平华[1] 

机构地区：[1]常州大学土木工程系,江苏常州213164

出　　处：《混凝土》2015年第11期56-60,共5页Concrete

基　　金：国家自然科学基金项目(51278073);江苏省六大人才高峰项目;江苏省产学研联合创新资金--前瞻性联合研究项目(BY2013024-17)

摘　　要：为探讨以废弃再生混凝土为骨料制备结构用循环再生混凝土的可行性,试验研究了不同拉应力水平下二次循环再生细骨料混凝土的碳化性能。结果表明:中应力水平有利于增大二次循环再生细骨料混凝土的碳化抗力,当应力水平取66%破坏荷载时,碳化深度将达到最低值;高应力水平则明显加速二次循环再生细骨料混凝土碳化;随着循环再生细骨料取代率的增大,二次循环再生细骨料混凝土的平均碳化深度呈增加趋势。基于Fick定律,建立了考虑应力水平与循环再生细骨料取代率影响的碳化深度预测模型,试验结果与预测模型计算结果吻合较好。To explore the feasibility of recycled concrete for structure made by waste concretes, secondary circulated recycled fine ag- gregate concretes were used as the research object toanalyzeabout recycled fine aggregate concrete carbonation performance under dif- ferent levels of tensile stress by a series of tests.It turned out that,compared to the higher stress level thatsecondary stress level could im- prove the recycled concrete carbonation resistance appropriately, moreover the higher stress level significantly accelerated the recycled concrete carbonation ; Indeed, the carbonation value would reach the minimum if the stress level of recycled fine aggregate concrete were at 66%of the breaking load from the angel of carbonation resistance ;With the increase of recycled fine aggregate rate, average of recy- cled concrete carbonation depth performed a trend of increase. At last, the carbonation model was established by using stress level, re- placement ratio and carbonization time as the independent variable factor, experimental results and the prediction model calculation re- suits were in good agreement.

关 键 词：再生混凝土 循环再生细骨料 碳化 应力水平 取代率 

分 类 号：TU528.01[建筑科学—建筑技术科学]