Asphalt pavement crack resistance, wear resistance, skid resistance, low noise level, but by the following discussion; some common causes and types of causes and treatment of bleeding, a middle of the road;; local bleeding first black color, and the wheel track, inside; Cause Analysis: asphalt aggregate ratio (also called oil) insufficient or excessive aggregate it; treatment methods: mild bleeding, and stone chips, 2~5mm particle size; two, oil; Cause Analysis: 1, hard oil; processing method: hard oil, while the weather is hot, the oil with a shovel, three, off the road; the oil on the skin;

Asphalt pavement crack resistance, wear resistance, skid resistance, low noise level, but because of the design, construction, maintenance and use of work or a procedural defect, often appear some quality problems, which is the main cause of disease, in some unfavorable conditions (such as water, climate, and other external traffic) the effect of the factors, it will produce a variety of diseases, such as bleeding, peeling, loose pits, etc., which requires us to have links to the disease to find out the reasons, when processing, to ensure traffic safety.

The following discussion of the common causes of the types and causes of the formation and treatment methods:

A weeping,

The middle of the road the first black subtractive local bleeding, followed by the wheel track, which from the liquefied oil, liquid oil thrown to move towards the road on both sides of focus, the formation of softening oil. If the oil layer is bad, the oil layer will be stuck to the wheel, so that the formation of the pit and other diseases, and so on. The oil, which is stuck in the oil, is splashed onto the pavement and forms a hard oil treatment.

Cause analysis: aggregate ratio (also called oil) is too large or lack of mineral aggregate, this is the main reason for the formation of bleeding; laying in the road construction in low temperature season, not forming, filling or loss, surface layer of asphalt aggregate ratio increased; the use of low viscosity oil is used as a surface layer, prone to bleeding; oilstone uneven mixing.

Treatment methods: mild bleeding, and grain size of 2~5mm chip, through the driving rolling flat stick wheel is appropriate. Heavy bleeding area, according to the situation, and particle aggregate size of 5~10mm, guide the vehicle rolling forming. Serious bleeding area, first sprinkle a layer of particle size of 10~15mm or more coarse aggregate, with the forced pressure roller, to achieve the basic stability, 5~10 and 2~5mm to aggregate into the driving rolling guide.

Two, oil bag

Reason analysis: 1, hard oil bag. The bottom layer of the oil bag is stable, because the surface aggregate is small, the local fine material is small, the oil content is too large, and the hard oil bag is formed under the driving action. The corners are more susceptible to oil, careless construction, car, oil Water Leakage not timely removed, also can produce oil. 2, soft oil bag. The bottom of the water content is too large, the evaporation of water does not come out, stay inside and outside bottom or bottom of alkaline earth is too thick to make the table at the bottom layer and the formation of two skins, driving the rolling back and forth, produce soft oil unstable package.

Processing method: hard oil, while the weather is hot, the oil shovel, flush with the road surface, remove impurities, three point slightly hot asphalt, and uniform material. For the soft oil, the soft oil layer is dug out, if too much moisture in asphalt, elastic soft, soft elastic part can be cut out and filled with new material, and a flat bottom and then use the new pragmatism, asphalt filled (thickness is no more than the original pavement leveling can be pragmatic). Old material due to excessive impurities, should not be used.

Three, peeling. Commonly known as alopecia areata"

Oil on the extent of the formation of a layer, into a piece of stripping called peeling, the reason, there are two kinds of:

The 1 layer construction, the table at the upper and lower two layers, due to moisture or dust, powder isolation effect of aggregate adhesion between

Node, while the upper oil viscosity, oil spillage not timely maintenance, the surface layer is stuck walking wheel.

2 because the bottom surface is loose or wet, the oil layer and the bottom layer are bad, and the whole surface layer is driven by the driving spalling.

3 surface layer mixture is not uniform, resulting in local aggregate ratio is too small, after forming in driving vibration spalling. Processing method: first, peeling second causes, can eliminate the loss and has loose oil and dust, powder, reveal the following text east of aggregate, and dry off. According to the different thickness of peeling, by mixing asphalt aggregate repair. For third kinds of reasons caused peeling, the need to remove the damaged part of the oil layer, the bottom of the first repaired, with a stable and dry, in the repair of shallow oil.

Four, Ma

Oil or sewing material disappeared, coarse material exposed, road density, so that the water seepage, pitting, forming pits.

Cause analysis: 1 layer construction, the surface layer of ink is less, sealing material is too thick, partial shedding. The 2 cold season or rainy season construction, road traffic shaping is slow, in effect, loose off sealing material. 3 hot mix asphalt construction, asphalt aggregate ratio is too small, mixing, paving the uneven local reservoir of coarse aggregate, the lack of fine material to fill the voids or coarse aggregate, the lack of fine material, can also cause local pits phenomenon.

Methods: the large pits, can the temperature rises (above 10 C), fine aggregate debris, remove loose dust on the road, and the road after drying, sprinkle a layer of oil (petroleum asphalt 0.8 kg /2 m), and then 3~8mm sealant,

Thickness should be appropriate, even after the guide roller compaction. In the area of small pits, clean the road after drying, which were small spreader thin brush or brush a layer of oil, then sprinkle fine filler (M gravel or coarse sand), evenly, slightly to pragmatic.

Five, loose

On the road, resulting in different sizes, different shapes of ore separate loose, structural damage, known as loose.