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Effect of curing on the physical and mechanical properties of cold-recycled bituminous mixtures

机译：固化对冷再生沥青混合物的物理和机械性能的影响

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摘要

Cold recycling of bituminous pavements is an effective way to reduce cost of pavement maintenance. Depending on composition, cold-recycled mixtures with a wide range of mechanical properties can be produced. However, regardless of composition, a distinctive feature of cold-recycled mixtures is the requirement for a curing period to develop the long-term mechanical properties. The main objective of this study was to characterize the curing process of cold-recycled mixtures by analysing the rate at which mixture properties evolve over time and their value in the long-term cured state. The study was focused on two mixtures with a fixed dosage of bituminous emulsion (3.3%) and two cement dosages (1% and 2.5%). Moisture loss by evaporation, ITS and ITSM were measured over time (100 days), considering two curing temperatures (25 ℃ and 40 ℃). The evolution of such properties was modelled using two asymptotic regression models. Results showed that the Michaelis-Menten model effectively describes the evolution of material properties over time, the relation between water loss and mechanical properties and the relation between ITSM and ITS. Cement dosage had an important impact on the long-term values of material properties, whereas curing temperature mainly influenced the rate of curing.
机译：沥青路面的冷回收是降低路面维护成本的有效方法。根据成分，可以生产出具有广泛机械性能的冷再生混合物。然而，不管组成如何，冷再生混合物的显着特征是要求固化时间以开发长期的机械性能。这项研究的主要目的是通过分析混合物性能随时间变化的速率及其在长期固化状态下的价值来表征冷再生混合物的固化过程。该研究集中于两种混合物，其中沥青乳液的剂量固定（3.3％），水泥剂量的两种（1％和2.5％）。考虑到两个固化温度（25℃和40℃），随时间（100天）测量了蒸发，ITS和ITSM引起的水分损失。使用两个渐近回归模型对此类属性的演化进行建模。结果表明，Michaelis-Menten模型有效地描述了材料特性随时间的演变，失水与力学性能之间的关系以及ITSM和ITS之间的关系。水泥用量对材料性能的长期值具有重要影响，而固化温度主要影响固化速率。

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