CN103774518A - Fiber reinforced bituminous pavement stress absorbing layer and construction method thereof - Google Patents

Abstract

The invention discloses a fiber reinforced bituminous pavement stress absorbing layer. Each cubic meter of the fiber reinforced bituminous pavement stress absorbing layer comprises 2.0 to 3.2 kg of SBS modified emulsified asphalt, 80 to 160 g of a glass fiber or basalt fiber and 16 to 24 kg of broken stone. A construction method for the layer comprises the following steps: successively sprinkling the SBS modified emulsified asphalt, the glass fiber or basalt fiber, the SBS modified emulsified asphalt and the broken stone on the surface of a clean and dry road base surface; and rolling the pavement 4 to 6 times 20 min after completion of sprinkling. According to the invention, the prepared fiber reinforced bituminous pavement stress absorbing layer is firmly bonded with a subbase layer and an upper asphalt layer, can prevent occurrence of asphalt surface course reflection cracks and pit slots and damage of a road base and a surface layer by water and prolongs the service life of the pavement.

Description

A kind of fiber reinforcement type flexible pavement stress absorbing layer and construction method thereof

Technical field

The present invention relates to the realm of building construction, relate in particular to a kind of fiber reinforcement type flexible pavement stress absorbing layer and construction method thereof.

Background technology

Existing fiber reinforcement type flexible pavement stress absorbing layer is that making is between semi-rigid type base and flexible pavement or between cement concrete pavement and flexible pavement, or the fibre reinforced asphalt layer with high deformability between the cement concrete pavement after fragmentation and flexible pavement, the stress that is mainly used in alleviating location of cracks is concentrated, prevent that flexible pavement from forming reflection crack, prevents the damage of basic unit and surface layer water.

In Practical Project, often there is the not firm phenomenon of bonding between flexible pavement stress absorbing layer and sub-layer (cement concrete pavement after semi-rigid type base or cement concrete pavement or fragmentation); Meanwhile, be prone to basic unit's water on move or surface layer water under ooze and the pavement damage that causes, cause asphalt surface course to occur crack, hole, hole, gather around many disease phenomenons such as bag, rut, had a strong impact on Pavement Condition, shortened service life of road surface.

Summary of the invention

The present invention, in order to solve the above-mentioned deficiency of prior art, provides a kind of fiber reinforcement type flexible pavement stress absorbing layer and construction method thereof.

Above-mentioned purpose of the present invention realizes by following technical scheme:

A kind of fiber reinforcement type flexible pavement stress absorbing layer, every cubic metre of high tack coat of the high winding of bridge floor comprises: SBS modified emulsifying asphalt, 80～160g glass fiber or the basalt fibre of 2.0～3.2kg, 16～24kg rubble.

The technical requirements of above composition material is as follows:

SBS modified emulsifying asphalt should meet " technical requirements of table 4.7.1-2 modified emulsifying asphalt " in " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004).

Glass fiber adopts roving type glass fiber, and tex (Tex) is 2400, and the length of fiber is 60mm.

Rubble adopts the basaltic broken stone that stone matter is hard, clean, do not contain weathering particle, nearly cube, impact breaker rolling, and 0.075mm sieve aperture percent of pass is less than 0.4%, meets grading limit as shown in table 1:

Table 1

Square hole screen size (mm)	Percent of pass requires (%)
		13.2	100
9.5	90～100
		4.75	0～20
0.6	0～5
		0.075	0～0.4

The quality of rubble should meet the technical requirements of " speedway and Class I highway surface course " coarse aggregate in " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) " table 4.8.2 coarse aggregate quality technology used for asphalt mixture requires ".

The construction method of above-mentioned fiber reinforcement type flexible pavement stress absorbing layer, its step is as follows:

First,, on clean, dry sub-layer surface, with fiber Synchronous pavement surface dressing equipment consumption according to the rules, spray successively SBS modified emulsifying asphalt, glass fiber, SBS modified emulsifying asphalt and building stones; Treat to roll before mulseal breakdown of emulsion, after having rolled, the asphalt surface course of can constructing.

Secondly, on road surface, roll, the number of times rolling is 4～6 times, and available 2 25 tons above pneumatic-tired rollers roll immediately following fiber asphalt synchronous breakstone construction equipment, roll number of times and be every 2～3 times.

The present invention's advantage is compared with prior art:

(1) bitumen content that the present invention is higher provides larger cracking resistance, resistance to deformation, waterproof impermeable role for pavement of road;

(2) the present invention's fibrage into the net is wrapped by pitch and rubble fixing, for this layer provides anticracking, the anti-crack ability far above conventional road surface stress absorbing layer;

(3) high-quality rubble of the present invention for total layer provide on mechanics continuously, when as stress absorbing layer, provide high withstand voltage broken characteristic.

The specific embodiment

Below the present invention is described in further detail:

Embodiment 1:

A kind of fiber reinforcement type flexible pavement stress absorbing layer, every cubic metre of fibre-reinforced flexible pavement stress absorbing layer composition material is: SBS modified emulsifying asphalt, 160g glass fiber or the basalt fibre of 3.2kg, 16kg rubble.

Adopted the SBS modified emulsifying asphalt of on-the-spot processing, technical performance meets " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) " technical requirements of table 4.7.1-2 modified emulsifying asphalt ".

Glass fiber has adopted roving type glass fiber, and tex (Tex) is 2400g/km, and the length of fiber is 60mm.

Rubble has adopted the basaltic broken stone of the impact breaker rolling of Nanjing Pan Jing mining industry Co., Ltd production, and grading limit is in table 2.The quality of rubble meets " standard specification for construction and acceptance of highway asphalt pavement " (JTGF40-2004) technical requirements of " table 4.8.2 coarse aggregate quality technology used for asphalt mixture requires " middle coarse aggregate.

Table 2

Square hole screen size (mm)	Percent of pass requires (%)
		13.2	100
9.5	90～100
		4.75	0～20
0.6	0～5
		0.075	0～0.4

The GYKT0612 type that the construction of fiber reinforcement type flexible pavement stress absorbing layer has adopted He'nan Gaoyuan Highway Maintenance Equipment Co., Ltd. to produce adds fine synchronous macadam seal paver.

Construction method is: on the cement concrete pavement after fragmentation, with adding fine synchronous macadam seal paver consumption according to the rules, spray SBS modified emulsifying asphalt, glass fiber, SBS modified emulsifying asphalt, building stones simultaneously; After spread with 2 25 tons above pneumatic-tired rollers immediately following rolling thereafter, roll number of times and be every 3 times; Wait until that from spread fiber, pitch, rubble the time of having rolled is 30 minutes; After having rolled, the asphalt surface course of having constructed immediately.

Embodiment 2:

A kind of fiber reinforcement type flexible pavement stress absorbing layer, every cubic metre of fibre-reinforced flexible pavement stress absorbing layer composition material is: SBS modified emulsifying asphalt, 120g glass fiber or the basalt fibre of 2.4kg, 20kg rubble.

The SBS modified emulsifying asphalt that has adopted Shanghai Pudong Road & Bridge bituminous material Co., Ltd to produce, technical performance meets " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) " technical requirements of table 4.7.1-2 modified emulsifying asphalt ".

Glass fiber has adopted roving type glass fiber, and tex (Tex) is 2400g/km, and the length of fiber is 120mm.

Rubble is the basaltic broken stone that originates from industry, and grading limit is in table 3.The quality of rubble meets the technical requirements of coarse aggregate in " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) " table 4.8.2 coarse aggregate quality technology used for asphalt mixture requires ".

Table 3

Square hole screen size (mm)	Percent of pass requires (%)
		13.2	100
9.5	90～100
		4.75	0～20
0.6	0～5
		0.075	0～0.4

The GYKT0612 type that the construction of fiber reinforcement type flexible pavement stress absorbing layer has adopted He'nan Gaoyuan Highway Maintenance Equipment Co., Ltd. to produce adds fine synchronous macadam seal paver.

Construction method is: on the cement concrete pavement after fragmentation, with adding fine synchronous macadam seal paver consumption according to the rules, spray SBS modified emulsifying asphalt, glass fiber, SBS modified emulsifying asphalt, building stones simultaneously; After spread with 2 25 tons above pneumatic-tired rollers immediately following rolling thereafter, roll number of times and be every 3 times; Wait until that from spread fiber, pitch, rubble the time of having rolled is 30 minutes; After having rolled, the asphalt surface course of having constructed immediately.

But the above-mentioned specific embodiment is exemplary, be to be the restriction that this patent is comprised to scope in order better to make those skilled in the art can understand this patent, can not to be interpreted as; As long as any being equal to done according to spirit that this patent discloses changes or modify, all fall into the scope that this patent comprises.

Claims (4)

1. a fiber reinforcement type flexible pavement stress absorbing layer, is characterized in that: every cubic metre of high tack coat of the high winding of bridge floor comprises: the SBS modified emulsifying asphalt of 2.0～3.2kg; 80～160g glass fiber or basalt fibre; 16～24kg rubble.

2. a kind of fiber reinforcement type flexible pavement stress absorbing layer according to claim 1, is characterized in that: described glass fiber adopts roving type glass fiber, and tex is 2400Tex, and the length of fiber is 60mm.

3. a kind of fiber reinforcement type flexible pavement stress absorbing layer according to claim 1, is characterized in that: described rubble is basaltic broken stone, and 0.075mm sieve aperture percent of pass is less than 0.4%.

4. a construction method for fiber reinforcement type flexible pavement stress absorbing layer, is characterized in that comprising the following steps:

First,, on clean, dry sub-layer surface, with fiber Synchronous pavement surface dressing equipment consumption according to the rules, spray successively SBS modified emulsifying asphalt; Glass fiber; SBS modified emulsifying asphalt and building stones; Treat to roll before mulseal breakdown of emulsion, after having rolled, the asphalt surface course of can constructing.

Secondly, on road surface, roll, the number of times rolling is 4～6 times, and available 2 25 tons above pneumatic-tired rollers roll immediately following fiber asphalt synchronous breakstone construction equipment, roll number of times and be every 2～3 times.