In the present MC 2010 the propagation period, addressing degradation processes, was not included said due to the lack of data to allow for a sound validation. However, taking account of the propagation period is essential for the assessment of existing reinforced concrete structures. In addition, considering the propagation period is relevant for the probabilistic definition of the service life, as a certain amount of degradation should be produced to result in a condition not fulfilling the design requirements. Regarding reinforcement corrosion, in the present work the model of Tuutti is generalized to nonconstant corrosion rates by considering a sequence of periods with each having a constant corrosion rate. Possible models for the calculation of the time to cracking are commented, together with the consideration of a possible limit state related to damage level. Regarding other of deterioration processes related to the concrete material itself, attempts to model these have been very limited and much less attention has been paid to characterize their rate. These processes include: alkali‐silica reaction or sulfate attack, acid or leaching by pure waters and frost attack. In the present article, such attacks are modeled through an initiation period followed by a propagation period. Their rate of deterioration can either be considered constant or also as a sequence of shorter consecutive linear time periods.

中文翻译：

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传播周期建模和极限降解状态

在当前的MC 2010中，由于缺乏用于声音验证的数据，因此未包括解决退化过程的传播时间。但是，考虑传播时间对于评估现有的钢筋混凝土结构至关重要。另外，考虑到传播周期与使用寿命的概率定义有关，因为应该产生一定程度的退化以导致不满足设计要求的条件。关于钢筋腐蚀，在当前工作中，通过考虑一系列具有恒定腐蚀速率的周期，将Tuutti模型推广到非恒定腐蚀速率。评论了计算破裂时间的可能模型，以及与损坏程度有关的可能极限状态的考虑。关于与混凝土材料本身有关的其他劣化过程，对它们进行建模的尝试非常有限，并且很少注意表征其速率。这些过程包括：碱硅石反应或硫酸盐侵蚀，酸或纯水浸出和霜冻侵蚀。在本文中，通过发起阶段和传播阶段对这种攻击进行建模。它们的恶化速率可以被认为是恒定的，或者也可以看作是较短的连续线性时间周期的序列。这些过程包括：碱硅石反应或硫酸盐侵蚀，酸或纯水浸出和霜冻侵蚀。在本文中，通过发起阶段和传播阶段对这种攻击进行建模。它们的恶化速率可以被认为是恒定的，或者也可以看作是较短的连续线性时间周期的序列。这些过程包括：碱硅石反应或硫酸盐侵蚀，酸或纯水浸出和霜冻侵蚀。在本文中，通过发起阶段和传播阶段对这种攻击进行建模。它们的恶化速率可以被认为是恒定的，或者也可以看作是较短的连续线性时间周期的序列。