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研究不同粉煤灰掺量(0%、20%、40%、60%)下高性能混凝土经快速冻融试验后的碳化现象;定义冻融循环作用下混凝土碳化判定新准则;采用图像处理技术定量分析不同粉煤灰掺量、不同冻融破坏程度对碳化的影响规律。试验表明:经冻融破坏后混凝土碳化现象和传统碳化现象有所不同,碳化深度测试法已不能表征其新特征,而碳化面积法能较好阐述混凝土冻融破坏后的碳化规律;冻融破坏后的碳化面积与粉煤灰掺量呈二次抛物线关系;碳化面积与冻融破坏程度服呈线性相关;混凝土冻融循环作用下的碳化研究对冻融地区混凝土结构耐久性和寿命预测具有现实意义。
The carbonation phenomenon of high performance concrete with different fly ash contents (0%, 20%, 40%, 60%) was studied after rapid freezing and thawing. The new criterion of carbonation judgment of concrete under the action of freeze-thaw cycle was defined. The image processing technology Quantitative analysis of different fly ash content, different degrees of freeze-thaw damage on carbonation. The results show that the carbonation phenomenon of concrete after freezing and thawing is different from the traditional carbonation phenomenon. The carbonation depth test method can not characterize the new features. However, the carbonation area method can well describe the carbonation rules of concrete after freeze-thaw failure. The area after carbonization and the content of fly ash showed a quadratic parabola relationship; carbonation area and the degree of freeze-thaw damage is linearly correlated; carbonation under the effect of freeze-thaw cycles of concrete structure durability and life prediction in the freeze-thaw area of a reality significance.