Rigid stress absorbing layer for reflection crack prevention of composite pavement and preparation method of rigid stress absorbing layer

Abstract

The invention relates to a rigid stress absorbing layer for preventing reflection cracks of a composite pavement. The rigid stress absorbing layer is made of a high-ductility cement-based composite material. The high-ductility cement-based composite material is prepared from the following raw materials in parts by mass: 300 to 350 parts of cement, 800 to 1000 parts of fly ash, 20 to 150 parts of silica fume, 40 to 100 parts of microbeads, 400 to 600 parts of river sand, 300 to 450 parts of water, 3 to 4 parts of an additive and 10 to 30 parts of polyvinyl alcohol fiber. The invention further relates to a preparation method of the rigid stress absorbing layer for preventing the reflection cracks of the composite pavement. The PVA fiber in the rigid stress absorption layer plays a bridging role, so that the material has good ductility, cannot crack rapidly under the load effect and effectively absorbs the stress at the joint of the concrete slab on the bottom layer, and the stress absorption layer with high crack resistance and good anti-reversion performance is provided for the composite pavement.

Description

technical field [0001] The invention relates to the field of pavement materials, in particular to a rigid stress absorbing layer for composite pavement anti-reflection cracks, and a preparation method for a composite pavement rigid stress absorbing layer for anti-reflection cracks. Background technique [0002] In the early 1970s, a large number of concrete pavements in my country began to be built and put into use. However, with the increasing traffic volume and the continuous rolling of heavy vehicles, the original concrete pavement began to be damaged to varying degrees, resulting in a rapid decline in pavement performance. In order to effectively deal with pavement diseases, the old concrete pavement needs to be reconstructed, so the composite pavement has also ushered in the rapid development. This type of pavement is mainly to add asphalt mixture surface layer on the old cement concrete pavement. The composite pavement has the advantages of high overall stiffness, goo...

AI Technical Summary

Problems solved by technology

Composite pavement has the advantages of high overall rigidity, good stability, and good driving comfort. However, due to the influence of vehicle load and temperature load, cracks are prone to occur in the upper layer of asphalt. Among them, reflection cracks are the most prominent, and reflection cracks continue to expand and damage the structure. Internally, it seriously affects the service life of the composite pavement

For the main problem of reflective cracks, only thickening the asphalt layer cannot effectively prevent the occurrence of reflective cracks, and the anti-reflection effect achieved by laying traditional pavement interlayer materials such as geotextiles and glass fiber grids is not obvious

[0003] Composite pavement structures are mostly used on national expressway arterial roads with large traffic volume and heavy transportation tasks. Road maintenance is difficult and takes a long time. Road enclosure may be required, which seriously affects normal traffic and causes large-scale traffic jams.

Images