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冷再生技术存在的问题和发展方向

来源:https://www.sddhfjx.com/ 日期:2024-03-10

1、再生层有关的材料强度。材料强度可采取间接法测定,即对取自于再生机后面的混合料试样进行各种试验;或者采用直接法测定,即钻芯取样测定实际强度。由于在完工和钻芯之间有段难以避免的时间延长,而采用再生机后的材料试样进行室内试验,其结果相对较快。

1. The material strength related to the regeneration layer. The material strength can be measured indirectly by conducting various tests on the mixed material samples taken from behind the regeneration machine; Alternatively, the direct method can be used, which involves taking samples from the drill core to determine the actual strength. Due to an unavoidable time delay between completion and core drilling, the results of indoor testing using recycled material samples are relatively fast.

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2、压实后材料的干密度。由于再生后材料的组成和颗粒尺寸往往存在变异性,干密度因而存在变异性,那么以干密度的百分比作为现场密实度的测量是十分困难的。在短的路段内,干密度变化5%是正常的,应该确定每个测试点具体的干密度。这需要在现场实验室付出大量的工作。

2. The dry density of the compacted material. Due to the variability in the composition and particle size of recycled materials, there is variability in the maximum dry density. Therefore, it is very difficult to measure the on-site density as a percentage of the maximum dry density. It is normal for the maximum dry density to change by 5% in short road sections, and the specific maximum dry density for each test point should be determined. This requires a lot of work in the on-site laboratory.

3、完工层的厚度。完工层的厚度可通过在再生层上开挖小测试孔来检查(如在完工后立即进行比较理想)。另外,可等材料达到一定的强度后,从再生层钻取150mm直径的芯样来测定厚度,这通常需要在28d后进行。

3. The thickness of the finished layer. The thickness of the completed layer can be checked by excavating small test holes on the recycled layer (ideal if done immediately after completion). In addition, after the material reaches a certain strength, a 150mm diameter core sample can be drilled from the regeneration layer to determine the thickness, which usually needs to be carried out after 28 days.

虽然冷再生技术可以全部利用旧沥青层,但从根本上说,这种利用只是简单的利用,并没有充分利用旧沥青材料,因此,泡沫沥青改性及提高混合料的性能,使再生回收沥青混合料达到作为磨耗层的标准是今后努力的方向。

Although the cold recycling technology can make full use of the old asphalt layer, fundamentally speaking, this kind of utilization is just a simple utilization, and does not make full use of the old asphalt materials. Therefore, foam asphalt modification and improving the performance of the mixture to make the recycled asphalt mixture meet the standards as a wearing course is the direction of future efforts.

总的说来,从节约能源和运输费用角度来看,采用泡沫沥青进行现场冷再生是目前沥青路面回收再利用比较合适的工艺方式。作为一项创新型实用技术,沥青路面冷再生极大程度地改变了我国沿用多年的传统的沥青路面维修方法。采用沥青路面冷再生技术,能够节约大量的沥青、砂石等原材料,同时有利于处理废料、保护环境。由于经济与的要求,尽可能多地利用现有路面材料进行公路养护维修和改造,是符合可持续发展要求的。在我国沥青路面维修养护工程量不断增加的今天,使用冷再生技术具有重要价值。

In general, from the perspective of saving energy and transportation costs, on-site cold recycling of foam asphalt is a more appropriate process for recycling of asphalt pavement. As an innovative and practical technology, cold regeneration of asphalt pavement has greatly changed the traditional asphalt pavement maintenance methods that have been used in China for many years. The use of asphalt pavement cold recycling technology can save a large amount of raw materials such as asphalt and sand, while also being beneficial for waste treatment and environmental protection. Due to economic and environmental requirements, it is in line with sustainable development requirements to make the most of existing pavement materials for highway maintenance, repair, and renovation. Today, with the increasing amount of asphalt pavement maintenance and repair work in China, the use of cold recycling technology is of great value.

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