Thin-layer hood face structure for cement concrete bridge deck pavement modification and construction method thereof

Abstract

The invention discloses a thin-layer hood face structure for cement concrete bridge deck pavement modification. The thin-layer hood face structure is a combined structure which is composed of two lower rubber asphalt macadam seal layers and an upper sand-grain-type ultrathin asphalt concrete wearing layer, and the two rubber asphalt macadam seal layers are embedded and squeezed with each other; the nominal maximum particle size of sand-grain-type ultrathin asphalt concrete is 6.7 cm, and the thickness is not larger than 2.0 cm. The invention further discloses a construction method of the hoodface structure. The construction method comprises the steps of firstly, conducting fine milling on original cement concrete bridge deck pavement, wherein the milling depth is 5 mm; after cleaning is thorough, scattering the first rubber asphalt macadam seal layer, after rubber wheels grind the first rubber asphalt macadam seal layer, scattering the second rubber asphalt macadam seal layer, and after grinding, the sand-grain-type ultrathin asphalt concrete is paved and grinded on the second rubber asphalt macadam seal layer. Compared with the prior art, the thin-layer hood face structure has the advantages of being high in bonding strength, resisting to cracking and slide, and having small increased dead loads and low cost.

Description

technical field [0001] The invention relates to the technical field of bridge deck pavement construction, in particular to a thin-layer overlay structure used for cement concrete bridge deck pavement reconstruction and a construction method thereof. Background technique [0002] The cement concrete bridges built in the early days are usually paved with cement concrete. With the gradual improvement of people's requirements for road driving quality, the shortcomings of cement concrete bridge deck pavement are loud noise and poor driving comfort. It is the general trend to transform the surface pavement into an asphalt concrete structure (commonly known as "white to black"). [0003] The "white to black" cement concrete bridge deck pavement generally adopts the overlay scheme of directly adding asphalt concrete, but the conventional asphalt concrete with a nominal particle size of 13.2mm needs to be paved with at least 4cm, and thicker asphalt concrete The structure will signi...

AI Technical Summary

Problems solved by technology

[0003] The "white to black" cement concrete bridge deck pavement generally adopts the overlay scheme of directly adding asphalt concrete, but the conventional asphalt concrete with a nominal particle size of 13.2mm needs to be paved with at least 4cm, and thicker asphalt concrete The structure will significantly increase the dead load of the bridge, resulting in the potential safety hazard of structural instability in the later use of the bridge. Therefore, it is urgent to develop an ultra-thin overlay structure for cement concrete bridge deck pavement reconstruction

Existing studies have shown that ultra-thin asphalt concrete can produce obvious economic and social benefits when applied to cement concrete bridge deck pavement reconstruction, but it also faces insufficient surface anti-slip, weak bonding between layers, and cannot solve reflection cracks The problem

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