When carrying out road maintenance, we need to investigate the original road to ensure the smooth progress of road maintenance with cold recycling machine.
1. Old road survey
The cold recycling technology is suitable for the overhaul and reconstruction of most old asphalt concrete roads. First, a detailed survey of the old road is required, mainly including the following contents:
1. Investigate the old road structure and the repair and reconstruction over the years to understand the pavement diseases, including deformation, cracks, edge damage, etc.
2. The deflection of the old road is detected to analyze the damage condition and bearing capacity of the old road, and determine the necessity of reusing the old road base for cold regeneration.
3. Core drilling and sampling shall be conducted for the structural layer of the old road to determine the thickness of the structural layer of the old road and the engineering characteristics of the materials of each layer.
2. Material composition design
通过试验分析，我们认为冷再生层的性能与混合料级配有着显着而密切的关系。如若旧料中4.75mm以上的粒料含量过低(<40%)，则需加入部分级配的新骨料；若旧料中4.75mm 以上的粒料含量过高(>80%)，则会导致细料(特别是<0.6mm 的集料)对空隙的填充不足，混合料强度偏低，则需在冷再生混合料中加入部分级配的细集料，以便形成具有良好级配的骨架密实结构，提高混合料的强度。但这无疑都会提高冷再生结构层的造价，需与新建的结构层进行经济比较以后再实施。
Through the test and analysis, we believe that the performance of the cold recycled layer has a significant and close relationship with the mixture gradation. If the content of aggregate above 4.75mm in the old material is too low (< 40%), it is necessary to add some graded new aggregate; If the content of granular materials above 4.75mm in the old materials is too high (> 80%), it will lead to insufficient filling of voids by fine materials (especially aggregates < 0.6mm) and low strength of the mixture. Therefore, it is necessary to add some graded fine aggregates to the cold recycled mixture to form a skeleton dense structure with good gradation and improve the strength of the mixture. However, this will undoubtedly increase the cost of the cold regeneration structural layer, which will be implemented after economic comparison with the new structural layer.
The above is the detailed introduction of the cold regenerator rental for you. I hope it will help you. If you have any questions, please contact us. We will provide you with services with a professional attitude https://www.sddhfjx.com