摘要
为研究轴压荷载作用下混凝土的抗碳化性能,利用自主设计的装置,对普通混凝土以及掺量为30%的粉煤灰混凝土进行轴压荷载-碳化耦合试验。基于试验数据,建立了考虑多因素影响的混凝土碳化深度预测模型,定量地分析了不同应力比下轴压荷载对混凝土碳化深度的影响。结果表明:相同条件下,随着碳化龄期的增长,混凝土碳化深度也在增加,但增长速率会逐渐下降;不同应力比对混凝土抗碳化性能影响也不尽相同,应力比为0.3时混凝土的抗碳化性能最优,应力比为0.6时抗碳化性能最差;相同环境条件下粉煤灰混凝土的抗碳化性能普遍弱于普通混凝土;碳化模型预测值与试验值相对误差小于3%,二者较为吻合。该碳化模型可用于预测混凝土在轴压荷载作用下的碳化深度,为后续不同材料混凝土结构的寿命预测提供参考依据。
In order to inv estigate the carbonation resistance of concrete under axial compression loading,two-factor coupled axial compression loading-carbonation test was carried out on original Portland concrete and fly ash concrete with 30% admixture using an in-house designed apparatus.According to the experimental data,a prediction model of the carbonation depth of concrete is established,which takes into account the influence of multiple factors.The results show that under the same conditions,the carbonation depth of concrete increases with the increase of carbonation age,but the growth rate decreases gradually.Different stress ratios have different effects on the anti-carbonization performance of concrete.Concrete has the best anti-carbonization performance when the stress ratio is 0.3 and the worst when the stress ratio is 0.6.Under the same environmental conditions,the anti-carbonization performance of fly ash concrete is generally weaker than that of ordinary Portland concrete.The relative error between the predicted and experimental values of the carbonation model is less than 3%,and the two are in good agreement.The carbonation model can not only be used to predict the carbonation depth of concrete under axial compressive load but also provide a reference for future life prediction of concrete structures with different materials.
作者
韩文宇
逯静洲
肖瑛
黄毓
孔政宇
HAN Wenyu;LU Jingzhou;XIAO Ying;HUANG Yu;KONG Zhengyu(School of Civil Engineering,Yantai University,Yantai 264005,China)
出处
《混凝土》
CAS
北大核心
2022年第9期99-102,110,共5页
Concrete
基金
国家自然科学基金资助项目(51978596)。
关键词
混凝土
粉煤灰
轴压荷载-碳化耦合
应力比
碳化深度预测
concrete
fly ash
coupling effect of axial compression loading and carbonation
stress ratio
prediction of carbonation depth
