Stress absorbing load bearing complex structure of high viscosity asphalt gap grading

Abstract

The invention belongs to the road engineering technical field, in particular to a stress absorbing load bearing complex structure of high viscosity asphalt gap grading. The lower layer of the complex structure layer is high viscosity asphalt gap thick grading mixture and the upper layer thereof is high viscosity asphalt gap semi-open mixture. The void fraction of the low layer mixture is 1%-4% and the low layer mixture comprises aggregate, stuffing, polymer fiber, and high viscosity modified asphalt. The void fraction of the upper layer mixture is 7%-13% and the upper layer mixture comprises aggregate, stuffing, lignin, polymer assorted fiber and high viscosity modified asphalt. The high viscosity modified asphalt used by the two mixtures comprises No. 90 matrix asphalt and defined amount additive agent. The aggregate more than 4.75 mm is coarse aggregate which is basalt, diabase and limestone. The stuffing is ground limestone powdered ore. The two mixtures are easily constructed. And the complex structure has good anti-shearing deformation performance and good resistance function for thermal contraction cracks and reflection cracks.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a stress-absorbing load-bearing composite structure used in road engineering, which specifically solves the problem of reflection cracks when an asphalt mixture surface layer is paved on an old cement concrete road surface. Background technique [0002] After a period of use, the cement pavement will be damaged to varying degrees. Adding asphalt concrete surface layer ("white plus black") on the cement concrete pavement can improve the use function of the cement pavement and improve the smoothness of the pavement, which is a common solution in engineering. However, the tensile effect caused by the shrinkage or displacement of the cement concrete slab in the horizontal direction, or the bending and tensile stress at the bottom of the surface layer, or the vertical shear stress at the joint (crack) of the cement slab under the action of traffic load, will Refl...

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Problems solved by technology

[0004] In recent years, there has been a treatment method of setting a reflective crack stress-absorbing structural layer between the cement concrete slab and the asphalt mixture surface, such as the "Strata" of an American company, but its own bearing capacity has been questioned

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