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泡沫沥青就地冷再生的技术

来源:http://www.tclqgc.com/ 日期:2024-06-07 发布人:

冷再生材料的性质与传统道路材料不完全相同,因而对成形的要求也不完全相同。冷再生材料按再生剂大致可以区分为两类:无机再生剂和沥青再生剂,沥青再生时往往加入少量水泥以提高其抗水损坏能力。常用的无机再生剂是水泥,其他还有二灰、水泥粉煤灰等。无机稳定冷再生一般按照传统的半刚性材料进行成形和养生。常温下进行重型击实试验或者振动击实试验,在20℃或者25℃下养生7天。

The properties of cold recycled materials are not completely the same as traditional road materials, so the requirements for forming are also not completely the same. Cold recycled materials can be roughly divided into two categories based on rejuvenators: inorganic rejuvenators and asphalt rejuvenators. During asphalt regeneration, a small amount of cement is often added to improve its resistance to water damage. The commonly used inorganic rejuvenator is cement, and there are other types such as fly ash and cement fly ash. Inorganic stable cold regeneration is generally formed and cured using traditional semi-rigid materials. Conduct heavy compaction test or vibration compaction test at room temperature, and maintain for 7 days at 20 ℃ or 25 ℃.

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通过含水量-强度关系确定佳含水量。沥青稳定剂冷再生时的情况比较复杂,尚无统一方法。冷再生材料组成设计方法常见的方法是用击实法确定佳液体量,用马歇尔稳定度、干劈裂强度、湿劈裂强度中的一个或几个达到优来确定沥青用量。

Determine the optimal moisture content through the relationship between moisture content and strength. The situation during cold regeneration of asphalt stabilizers is quite complex, and there is no unified method yet. The common method for designing the composition of cold recycled materials is to use the compaction method to determine the optimal liquid volume, and to use one or more of Marshall stability, dry splitting strength, and wet splitting strength to determine the optimal asphalt dosage.

热拌沥青混合料层+冷再生层+旧有基层。旧有基层一般是砂砾基层。目前国内的冷再生道路其中使用较多的结构有热拌沥青混合料层+再生层+半刚性层和热拌沥青混合料层+再生层。随着我国大量的路面进入维修期,路面冷再生技术会得到更广泛的使用。文章总结了国内外再生的技术要点。国内对冷再生前评价尚无专门的评价方法,需要进一步研究;冷再生材料开始一般作为基层使用,目前逐步作为下面层使用;在我国冷再生施工中,水泥作为再生剂较多其实验方法已经较为统一,主要的参考传统的半刚性材料;而沥青作为再生剂的冷再生实验方法还不统一,需要进一步研究确定合理的实验方法。

Hot mix asphalt mixture layer+cold recycled layer+existing base layer. The old base layer is usually a gravel base layer. At present, the structures commonly used in cold recycled roads in China include hot mix asphalt mixture layer+recycled layer+semi-rigid layer and hot mix asphalt mixture layer+recycled layer. With a large number of road surfaces entering the maintenance period in our country, cold pavement regeneration technology will be more widely used. The article summarizes the technical points of regeneration both domestically and internationally. There is currently no specialized evaluation method for cold regeneration in China, and further research is needed; Cold recycled materials are generally used as base layers and are gradually being used as lower layers; In China's cold recycling construction, cement is widely used as a rejuvenator, and its experimental methods have become relatively uniform, mainly referring to traditional semi-rigid materials; The experimental method for cold regeneration of asphalt as a rejuvenator is not yet unified, and further research is needed to determine a reasonable experimental method.

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冷再生材料的性质与传统道路材料不完全相同,因而对成形的要求也不完全相同。冷再生材料按再生剂大致可以区分为两类:无机再生剂和沥青再生剂,沥青再生时往往加入少量水泥以提高其抗水损坏能...

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