In the road maintenance work, we need to investigate the original road, in order to ensure that the use of cold recycling machine road maintenance work smoothly. Let's take you to have a look at it.
1. Old road survey
Cold recycling technology is suitable for most of the old asphalt concrete road repair and reconstruction projects. First of all, a detailed investigation of the old road is needed, mainly including the following contents:
1. To investigate the old road structure and repair and reconstruction over the years to understand the pavement diseases, including deformation, cracks, edge damage, etc.
2. In order to analyze the damage condition and bearing capacity of the old road by deflection detection, the necessity of cold recycling of old road base is determined.
3. In order to determine the thickness of the old road structure layer and the engineering characteristics of each layer material, core drilling and sampling are carried out for the old road structure 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著而密切的关系。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 think that the performance of cold recycled layer has a significant and close relationship with the gradation of mixture. If the content of particles above 4.75mm in old materials is too low (< 40%), it is necessary to add new aggregates with partial gradation; if the content of particles above 4.75mm in old materials is too high (> 80%), it will lead to fine materials (especially < 0.6mm) In order to form a well graded skeleton dense structure and improve the strength of the mixture, it is necessary to add some graded fine aggregate into the cold recycled mixture due to insufficient filling of voids and low strength of the mixture. But this will undoubtedly increase the cost of cold regeneration structure layer, which needs to be compared with the new structure layer before implementation.
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