High-elasto-viscosity stress absorbing layer and top facing construction process thereof

Abstract

The invention belongs to the technical field of road and bridge maintenance and discloses a high-elasto-viscosity stress absorbing layer and a top facing construction process thereof. The high-elasto-viscosity stress absorbing layer is arranged between an old cement concrete pavement and an overlay above the old cement concrete pavement, and composed of polymer modified asphalt, limestone, fine river sand and aggregate chips. The top facing construction process of the high elasto-viscosity stress absorbing layer comprises three steps in order: designing the mixing proportion of the high-elasto-viscosity stress absorbing layer; determining the plane position, and performing preparation before construction; and mixing a polymer modified asphalt-concrete mixed material, transporting, paving and rolling. The high-elasto-viscosity stress absorbing layer has the powerful stress absorption capacity, high caking capacity and excellent waterproofness, and is capable of generating a delaying effect on cracks of a polymer modified asphalt-concrete surface layer due to stress concentration, and therefore, the anti-rutting performance of a pavement is greatly improved, and the water damage of a base layer as pavement water seepage enters the base layer also can be prevented.

Description

technical field [0001] The invention relates to the technical field of road and bridge maintenance, in particular to a high elastic-viscosity stress-absorbing layer and its overlay construction technology. Background technique [0002] From the 1970s to the early 1990s, some provinces in my country (such as Hubei, Hunan, Guangxi, Jiangxi, Anhui and other provinces) built a large number of cement concrete roads. In recent years, with the increase in traffic volume, overloading With the increase of vehicles, various diseases such as broken boards, cracks, mud pumping, uneven subsidence, pitting, pits and so on appear on the cement concrete pavement to varying degrees, which greatly reduces the use function of the pavement. After a certain period of operation, the cement concrete pavement has entered a large-scale maintenance period. Especially in areas with hot summer and cold winter and abundant rainfall, the highway pavement has to bear greater temperature stress damage and ...

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Problems solved by technology

[0002] From the 1970s to the early 1990s, some provinces in my country (such as Hubei, Hunan, Guangxi, Jiangxi, Anhui and other provinces) built a large number of cement concrete roads. In recent years, with the increase in traffic volume, overloading With the increase of vehicles, the cement concrete pavement has various diseases such as broken boards, cracks, mud, uneven subsidence, pockmarks, pits and so on, which greatly reduces the use function of the pavement

[0004] However, the asphalt layer on the old cement pavement involves two types of pavement structures: rigid and flexible, and the material properties are significantly different. The cracks, missteps, voids and joints of the old cement pavement will make the corresponding position of the overlay layer easy to appear. Reflective cracks, the appearance of reflective cracks will seriously shorten the service life of the asphalt concrete surface

The early overlay layer can reduce the settlement by increasing the thickness of the overlay layer, and the thinner asphalt layer cannot prevent reflection cracks. However, after practice in Jiangsu Ningtong Consolidation and other road sections, it is found that cracks appear after 3 to 5 years of use

In addition, excessively thickening the asphalt layer has many disadvantages, such as limiting the increase in project cost, affecting traffic safety, and difficult to guarantee high temperature stability, etc.

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