Asphalt Plant Pavement Distress reason appeared analysis

In recent years the quality of asphalt road as a focus on investment in national infrastructure, local secondary roads, highway, highways, urban roads and other construction projects and a lot of money and limited in the road structure layer thickness design, materials, use of respects the principle of economic resilience, and changes in the volume of traffic, age, etc., and do not focus on. Limited bitumen production scale compliance, can not meet the needs of the domestic construction scale. This makes the inferior part of the asphalt mix of highway construction market, leaving a hidden danger to the road.
Through the layer of oil, the impact of oil on the surface of the adhesive layer in order to make asphalt road base has between itself and asphalt plant pavement layers with good binding, sprinkled through a number of layers of oil and sticky layer of oil is very necessary, However, the construction of which is generally transparent layer of oil by 1.2kg / m2, is mostly due to the current highway flyash cement stabilized graded gravel or crushed stone, permeability than the poor, plus partial extrusion flatness somewhat less , often through the layer of oil product nest phenomenon.
In recent years, due to climatic factors that affect global warming. Temperatures generally increase erratic weather, winter warming continuous high temperature in summer time to grow, whether such weather conditions continue to be test of time, as the temperature increases, leading to softening point is unfit to be lower grade, it is worth considering.
Asphalt concrete mixer design problems of asphalt concrete mixer design according to specifications should go through four stages, namely the target mix design phase, the design phase of the production mix, production mix and test validation phase test shop mix stage, the stage must achieve the purpose of the requirements are clear. During the construction, some two to three units of compression stages, some simply empirically construction, therefore, the presence of a large deviation from the theoretical and practical terms, leading to the presence of the intrinsic quality of asphalt concrete deficiencies, on the other hand, due to the the current national situation caused by the low price plus highway shorter duration, gravel quarry is not standardized, mostly by individual enterprises bear flooring, yard scattered, outdated equipment, material homogeneity and stability are large differences, although most of the units are sampled before the start of the screening analysis done to meet the requirements, but also to detect and to adjust the mixing ratio in the construction machinery process, but because of changes, big differences can not do very accurate, Whetstone than gradation are changing, which is a cause of some common diseases pavement.
Control of asphalt concrete mixing asphalt concrete mixing temperature control temperature control from the perspective of the more stringent specifications for petroleum asphalt mixing factory temperature requirements at 120 ℃ ~ 165 ℃, and in fact some of the construction unit in the mixing temperature control is not so rigorous, high low is very unstable, and some asphalt concrete measurement site pulled nearly 180 ℃, and sometimes less than 110 ℃, the temperature is too high may result in deterioration of asphalt, not sticky asphalt concrete loose, the temperature is too low, the asphalt mix material mixing uneven impact gradation, which also contributed to the local loose asphalt or other diseases sometimes a reason.
Paving asphalt concrete paving of asphalt concrete is relatively large domestic issues, in general two extremes, on the one hand, the requirements of highway paving paving equipment such as full-face or 2000 ABG, on the other hand individually City Department of Transportation or paving equipment used over the past 60 to 70 years of the 20th century, the surface is too narrow, there is no automatic leveling system, complete with the feeling of their experience of the operator for the construction, in fact some of the supervising engineer for two-way highway four-lane highway paving requires full-face, only takes into account the cross slope is easy to understand and eliminate the vertical seams evils are obvious. First, since the section width paving, asphalt from the middle to the sides of the hinge wheel transport inevitably produce segregation due to the large distance, such segregation has changed through the asphalt mix concrete production. Secondly, since the hot flat sides of the cantilever long yearned for a slave, with the increase in the number of paving deformation, but also have a greater impact on the pavement cross slope control. In addition, due to the full-face pavers require larger mixing capabilities, When the mixing station is small, easy to cause the paver open when stopping, so paving the temperature is too low. Impact on the pavement behind the paver is also larger, more vertical and horizontal seaming problems, especially rolling restrictions, is not easy to control all the rolling process is completed within a rolling temperature regulatory requirements, the degree of compaction of asphalt concrete hard reach.