EPP water-based epoxy primer + polymer modified asphalt fiber reinforced bridge deck waterproof layer construction technology

Background technique:

In recent years, China's bridge construction has developed rapidly, and the asphalt pavement layer of the bridge deck has become the main bridge deck structure fo.

The existing PB polymer-modified asphalt type waterproof layer construction technology ignores the selection of the primer (base layer treatment agent), and directly constructs the PB polymer-modified asphalt waterproof coating on the concrete ba.

Technical implementation elements:

The purpose of the present invention is to provide a kind of EPP water-based epoxy primer closed fiber reinforced bridge deck waterproof layer construction technology for the deficiencies of the prior art, the present invention adopts EPP water-based epoxy primer to seal the base concrete, and through The simultaneous cutting and spraying technology of PB polymer-modified asphalt and reinforced fiber prevents the moisture in the base concrete from affecting the interface of the waterproof layer, prevents the water in the concrete from evaporating and causes bulging at the interface of the waterproof layer, and improves the impermeability of the concrete surfa.

Process steps:

StepTreatment of the bridge deck base layer

Pretreatment of bridge deck concrete surface

First, check the appearance of the concrete surface of the bridge deck, and make sure that the bridge deck has no exposed ribs and teeth;

Bridge deck shot blasting and sand blasting construction

Use shot blasting machine to blast and sand blast the concrete surface of the bridge deck; overlap the traffic lanes between the two constructions of the shot blasting equipment, and the overlap width is 3-5cm;

After shot blasting and sandblasting, clean, clean and blow the concrete surface of the bridge deck; protect the treated surface and avoid secondary pollution;

StepSpray EPP water-based epoxy primer

Preparation of EPP water-based epoxy

EPP water-based epoxy is composed of curing agent and epoxy emulsion, e.

Spray EPP water-based epoxy primer

Use waterproof paint spraying equipment to spray the EPP water-based epoxy primer on the bridge deck concrete surface treated in stepIt requires good atomization, uniform spraying surface and no leakage ar.

The curing time after EPP water-based epoxy spraying is 24-72 hours;

StepSpray PB polymer modified asphalt fiber reinforced bridge deck waterproof layer

Spray PB polymer modified asphalt fiber reinforced bridge deck waterproof layer

Select the waterproof coating spraying equipment for the primer layer completed in step 2 to spray the PB polymer-modified asphalt fiber reinforced bridge deck waterproof layer; it is required to have good atomization, uniform spraying surface and no leakage areas;

According to the design grade and construction requirements of different urban roads and bridges, the spraying of PB polymer modified asphalt fiber reinforced bridge deck waterproof layer is divided into three-layer spraying or five-layer spraying; three-layer spraying construction is generally used in the Ministry of Communications Highway engineering bridges, in which the first and third layers are sprayed with polymer-modified asphalt layer, and the second layer is sprayed with polymer-modified asphalt fiber reinforced layer; five-layer spraying construction is generally used in municipal bridges, large bridges and important bridges , wherein the first layer, the third layer and the fifth layer are the polymer modified asphalt layer spraying, the second layer and the fourth layer are the polymer modified asphalt fiber reinforced layer spraying, and the time interval of each layer spraying is 4~ 6 hours;

Simultaneous construction of sprayed polymer-modified asphalt waterproof coating and reinforcing fibers

In 2 of the step 3, the spraying process of the PB polymer-modified asphalt fiber reinforced layer adopts the fiber synchronous cutting and spraying equipment, and the spraying of the polymer-modified asphalt waterproof coating and the cutting of the reinforcing fibers , Mixing is synchronously constructed by fiber synchronous cutting and spraying equipment, and it is completed at one ti.