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首页> 外文期刊>Chimie Nouvelle >Increasing the Durability of Asphalt Mixtures by Hydrated Lime Addition: How Does it Work?
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Increasing the Durability of Asphalt Mixtures by Hydrated Lime Addition: How Does it Work?

机译：通过添加水合石灰来提高沥青混合料的耐久性：它如何起作用？

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The tough winters of the past two years have shown how damaging they can be to the road network. Hydrated lime is clearly a good candidate in order to limit the detrimental effect of moisture and repeated freeze-thaw cycles on asphalt mixtures.Hydrated lime has been known as an additive for asphalt mixtures from their very beginning. It experienced a strong interest during the 1970s in the USA, when moisture damage and frost became some of the most pressing pavement failure modes of the time.Given its extensive use in the past 40 years, hydrated lime has been seen to be more than a moisture damage additive: It reduces chemical ageing of the bitumen and stiffens the mastic more than normal mineral filler above room temperature. All these properties impact durability and hydrated lime is now seen has an additive to increase asphalt mixture durability.This article is a literature review on the fundamentals of hydrated lime effect. The reasons why it is so effective lie in the strong interactions between aggregate and bitumen, and a combination of 4 effects, two on the aggregate and two on the bitumen.Hydrated lime modifies the surface properties of aggregate, allowing for the development of a surface composition and roughness more favourable to bitumen adhesion. Then, hydrated lime can treat the existing clayey particles adhering to the aggregate surface, inhibiting their detrimental effect on the mixture. Also, hydrated lime reacts chemically with the acids of the bitumen, which in turns slows down the age hardening kinetics and neutralizes the effect of the "bad" adhesion promoters originally present inside the bitumen, enhancing the moisture resistance of the mixture. Finally, the high porosity of hydrated lime explains its stiffening effect above room temperature.
机译：过去两年的严冬证明了它们对道路网络的危害。熟石灰显然是减少水分和重复冻融循环对沥青混合料有害影响的理想选择。熟石灰从一开始就被认为是沥青混合料的添加剂。在1970年代美国引起了浓厚的兴趣，当时湿气损害和霜冻成为当时最紧迫的路面破坏模式。鉴于在过去40年中的广泛使用，熟石灰已被广泛应用。湿气破坏添加剂：在室温下，它比普通的矿物填充剂更能减少沥青的化学老化并增强乳香。所有这些特性都会影响耐久性，现在可以看到熟石灰具有增加沥青混合料耐久性的添加剂。本文是有关熟石灰作用基础的文献综述。它如此有效的原因在于骨料和沥青之间的强相互作用，以及四种作用的组合，两种作用在骨料上，两种作用在沥青上。熟石灰改变了骨料的表面性质，使表面得以发展组成和粗糙度更有利于沥青的附着力。然后，熟石灰可以处理粘附在骨料表面上的现有黏土颗粒，从而抑制它们对混合物的有害作用。而且，熟石灰与沥青的酸发生化学反应，继而减慢了老化硬化动力学并中和了最初存在于沥青内部的“不良”粘合促进剂的作用，从而增强了混合物的耐湿性。最后，熟石灰的高孔隙度说明了其在室温以上的硬化作用。

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