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为了对新建混凝土结构进行碳化耐久性评估,采用无损检测方法对新建隧道混凝土结构保护层密实度和厚度进行了检测,并基于混凝土碳化速度和超声波传播速度之间的线性关系,提出一种用来对新建混凝土结构进行概率碳化寿命评估的方法,并使用该方法对2个隧道混凝土结构进行了概率碳化寿命评估.结果表明:在环境条件及对CO2结合能力基本相同的条件下,2个隧道概率碳化寿命相差较大,其中隧道A的概率碳化寿命均值为94.0%,各标段最大离差为11.6%;隧道B的概率碳化寿命均值为82.3%,各标段最大离差为27.0%.由评估结果分析可知,施工技术水平的不同造成2个新建隧道混凝土结构保护层质量分布出现离散性,从而最终导致2个隧道概率碳化寿命评估结果出现差异.
In order to evaluate the durability of the newly constructed concrete structure, the densification and thickness of the protective layer of the newly constructed tunnel structure were tested by non-destructive testing method. Based on the linear relationship between the carbonization velocity of the concrete and the ultrasonic propagation velocity, The method of estimating the life of probabilistic carbonization of newly constructed concrete structures was carried out and the lifetime of two tunnel concrete structures was evaluated by using this method.The results showed that under the condition of the same environmental conditions and the same CO2 binding capacity, The carbonation lifetimes are quite different, with the average of the probability carbonation lifetimes of tunnel A being 94.0% and the maximum deviation of each segment being 11.6%. The mean carbonation life of tunnel B is 82.3% and the maximum deviation of each segment is 27.0%. According to the analysis of the assessment results, the difference in construction technology results in the discrete distribution of the mass distribution of the protective layer of the two new tunnel concrete structures, which eventually leads to differences in the assessment results of the probability of carbonation of the two tunnels.