CN1827696A - Refractory modified asphalt horse's hoofs fat crushed stones(SMA) mixtures - Google Patents

Abstract

The invention relates to architectural material field and specifically to a flame-proof modified stone matrix asphalt (SMA) mixture used for tunnel paving, which is characterized in that selecting combustion inhibitor into asphalt mixture to make the mixture possess a flame-proof performance, and sufficiently exerting the paving property dominance of stone matrix asphalt (SMA) mixture. The said flame-proof modified stone matrix asphalt (SMA) mixture comprises heavy asphalt, polymer modifier, combustion inhibitor, aggregate, filling and fiber stability agent.

Description

Fire-retardant modified asphalt horse's hoofs fat crushed stones (SMA) compound

The technical field invention relates to a kind of asphalt, especially a kind of modified asphalt mixture that is applicable to the risen flame retardant effect of vcehicular tunnel paving.

Background technology is accompanied by the fast development of China's motorway, and the quantity of vcehicular tunnel is also in continuous increase.Vcehicular tunnel is as a special road section of highway, length does not wait to several kilometers from hundreds of rice, imagination is at this special road section, in case the automobile circuit fire takes place, automobile goods fire and traffic accident car collision, goods automobile (particularly tank wagon) are overturned the fire that causes, phenomenons such as smog is big, temperature is high, smoke evacuation is difficult, evacuation is difficult, fire attack difficulty can occur, its consequence is hardly imaginable.A lot of these class accidents had taken place in China and foreign countries' highway circle, suffered heavy losses.This shows,, should do one's utmost from all kinds of disaster hidden-troubles of source elimination based on strick precaution for the fire safety problem of vcehicular tunnel.

At present, domestic most of tunnel road surface generally adopts cement concrete or pitch to mat formation, though to a certain extent, the relative bituminous concrete pavement of cement concrete pavement is better than bituminous concrete pavement at aspects such as water tolerance, the feature of environmental protection, and can also avoid obnoxious flavour that pitch comes out to harm that human body caused when mating formation.But, according to domestic and international many studies show that, advantages such as cement concrete has been difficult to satisfy the requirement on road surface in the modern tunnel, and bituminous concrete pavement is comfortable with its driving, noise is little, airborne dust is few, easy to maintenance are widely used, and are the major project materials that is used for road construction at present.

The same with most of synthetic organic polymers, pitch has combustibility in air, along with its as the widespread use of material of construction on engineering, just progressively rise by the danger of the fire that it caused.Especially as long pavement material apart from road surface in the tunnel, in case vehicle fire takes place, bituminous pavement also can be on fire simultaneously or be generated dense smoke, thereby in the difficulty that has increased the weight of fire and personnel escape virtually.For example, the second in the world long tunnel Switzerland St.Gotthard Tunnel fire disaster tragic incident, because the on-the-spot various a large amount of toxic gases that material combustion discharged without fire-retardant finish that use, thereby making the very fast at short notice death by suffocation of people, number is 41 people nearly.

In order to solve the tunnel fire proofing problem, at present, people reduce the combustibility of bituminous pavement in the tunnel by taking two kinds of different modes.A kind of is to add fire retardant in bituminous concrete, by in itself and the pitch during flammable organic compound burning institute decompose and produce material and react, thereby slow down or stop the incendiary chain reaction, reach fire-retardant purpose.Another kind is to adopt to smear the back-fire relief heat-resistant coating on the supercrust of asphalt concrete pavement, plays the fp effect by isolating blacktop.

People such as Li Zuwei, Chen Huiqiang is at " research of flame-retardant pitch modification technology and fire retardant mechanism thereof " (2002, " Changsha Traffic College journal ", Vol.18, No.4, P.44-47) in, according to special environment for use in be correlated with both at home and abroad modern technique and the tunnel, proposed the technical requirements of tunnel pavement, and studied asphalt flame-retardant modification technology and its fire retardant mechanism of suitable tunnel pavement.Its relevant flame-retarded technology mainly is by add halogenated flame retardant and inorganic metal compound fire retardant in bituminous concrete, utilize halogenated flame retardant that decomposition reaction at high temperature takes place and discharge HX (X represents halogen system), radical generation chain reaction in HX and the flame, radical concentration is reduced, thereby slow down or stop the incendiary chain reaction, reach fire-retardant purpose; Inorganic metal compound is heated to certain temperature and can decomposes, and generates water, and this reaction itself is exactly thermo-negative reaction, and the water that reaction is generated also can absorb a large amount of heat, thereby reduced the temperature of system, delayed the bituminous decomposition, reached fire-retardant purpose.To a certain extent, though the mutual synergistic effect of halogenated flame retardant and inorganic metal compound fire retardant can play tangible flame retardant effect, it is relatively poor that but the thermostability of halogenated flame retardant and smoke-suppressing all compare, inorganic metal compound wants to reach the ideal flame retardant effect, must strengthen its loading level, and loading level is strengthened, must cause pitch mixing, mobile poor during moulding, the processing of material and mechanical property are descended.

U.S. Pat 4659381 discloses a kind of antiflaming asphalt mixture, and it is by adding at least a halogenated flame retardant and at least a phosphorated mineral compound in modifying asphalt, as ammonium phosphate or red phosphorus, reaching the purpose of fire protection flame retarding.Though to a certain extent, it can satisfy the particular requirement of modern fire prevention tunnel road surface preferably, because it has adopted inert filler as weighting agent, when compound composition stability of structure was used for highway fire prevention tunnel road surface, effect was not fine.

During presence of fire, cigarette is to produce at first and the most fatal factor, and according to statistics, death toll has 80% to be due to cigarette suffocates in the fire.And in the middle of the existing flame-retarded technology, but seldom have " fire-retardant " and " pressing down cigarette " are mentioned in the same breath, moreover for some superpolymer, it is more even more important than " fire-retardant " " to press down cigarette ", especially the fire retardant of Halogen system is the main source that is fuming of smog, so, can develop a kind of can either be fire-retardant, the efficient flame-retarding agent that can press down cigarette again is the main direction and the trend of industry development from now on.

Summary of the invention the present invention adopts fire retardant and polymer composite modified asphalt on the basis of present flame-retarded technology, and preparation is used for pitch horse's hoofs fat crushed stones (SMA) compound of tunnel pavement.This compound has following characteristics: (1) is fire-retardant; (2) has the good pavement performance that common SMA compound has; (3) frictional coefficient height; (4) noise is low.

Fire-retardant modified asphalt horse's hoofs fat crushed stones of the present invention (SMA) compound comprises following component: heavy traffic asphaltum, and polymer modifiers, fire retardant gathers materials, filler, fiber stabilizer, each constituent materials character and addition content are as follows:

Heavy traffic asphaltum, label are AH-70 or AH-90 or AH-110.

Polymer modifiers can be SBS or SBR or SB or PE or rubber powder, and volume is 1%～12% of a heavy traffic asphaltum volume.

Fire retardant adopts halogenated fire-retardants, can be the adjacent dicarboximide of Polybrominated biphenyl oxide compound or many bromobenzenes or many bromines biphenol-A and ester or many bromines hexichol oxycompound or many bromobenzenes, and volume is 1%～20% of heavy traffic asphaltum and a polymer modifiers total mass.

Heavy traffic asphaltum, polymer modifiers and the flame-retardant mixture consumption in antiflaming asphalt mixture is 5.7%～6.4%.

Gathering materials can be basalt or diabase or limestone, and technical requirements sees the following form:

Table 1 technical requirements of gathering materials

Test index	Requirement
		Crush values (%)	≯25
The China fir machine that falls abrasion (%)	≯30
		Apparent density (g/cm 2)	≮2.6
Water-intake rate (%)	≯2.0
		With bituminous adhesivity (level)	≮4
Faller gill shape granule content (%)	≯15
		Soft rock content (BPN)	≯1

Filler: limestone dust or slaked lime or cement;

Gather materials, the whole grating of filler is:

Table 2 grading limit

Sieve aperture/mm

16

13.2

9.5

4.75

2.36

1.18

0.6

0.30

0.07 5

Percent of pass/%

100

90～1 00

50～7 5

18～3 0

15～2 6

14～2 4

12～2 0

10～1 6

8～12

Fiber stabilizer can be polyacrylonitrile fibre or trevira or lignin fibre, and volume is 0.1%～0.5% of a mixture quality.

Embodiment fire-retardant modified asphalt horse's hoofs fat crushed stones (SMA) compound comprises following several component, gathers materials: basalt meets the regulation of table 1.

Filler: limestone dust.

Mineral aggregate (gathering materials+filler) grating is:

Sieve aperture/mm	13.2	9.5	4.75	2.36	1.18	0.6	0.30	0.075
									Percent of pass/%	100	68.0	26.5	18.9	14.9	12.5	11.0	9.5

Heavy traffic asphaltum: the AH-90 heavy traffic asphaltum, by luxuriant alum production;

Polymer modifiers: star-shaped sbs properties-correcting agent, addition content are heavy traffic bituminous 4.5%; Fire retardant: decabromodiphynly oxide, volume are 8% of heavy traffic asphaltum and polymer modification agent composition;

Heavy traffic asphaltum+polymer modifiers+flame-retardant mixture: gather materials+filler=6: 100

Fiber stabilizer: Derain nit ASII polyacrylonitrile fibre, volume is 0.3% of a compound total mass.

Claims (8)

1, fire-retardant modified asphalt horse's hoofs fat crushed stones (SMA) compound comprises following component: heavy traffic asphaltum, polymer modifiers, fire retardant, gather materials, filler, fiber stabilizer is characterized in that: the polymer modifiers volume is 1%～12% of a heavy traffic asphaltum volume, the fire retardant volume is 1%～20% of heavy traffic asphaltum and a polymer modifiers total mass, and the fiber stabilizer volume is 0.1%～0.5% of a mixture quality.

2, heavy traffic asphaltum according to claim 1 is characterized in that: this heavy traffic asphaltum is AH-70 or AH-90 or AH-110.

3, polymer modifiers according to claim 1 is characterized in that: used polymer modifiers is SBS or SBR or SB or PE or rubber powder.

4, fire retardant according to claim 1 is characterized in that: fire retardant is Polybrominated biphenyl oxide compound or many bromobenzenes or many bromines biphenol-A and ester or many bromines hexichol oxycompound or the adjacent dicarboximide of many bromobenzenes.

5, according to claim 1 gathering materials, it is characterized in that: used gathering materials is basalt or diabase or limestone.

6, filler according to claim 1 is characterized in that: used filler is limestone dust or slaked lime or cement.

7, according to claim 2, the described heavy traffic asphaltum of claim 3 and claim 4, polymer modifiers, fire retardant is characterized in that: heavy traffic asphaltum, polymer modifiers and the flame-retardant mixture consumption in antiflaming asphalt mixture is 5.7%～6.4%.

8, according to claim 5 and claim 6 describedly gather materials, filler, it is characterized in that: gather materials in the compound, the grading limit of filler is as follows:

Gather materials, the whole grating of filler is:

Sieve aperture/mm 16 13.2 9.5 4.75 2.36 1.18 0.6 0.30 0.07 5 Percent of pass/% 100 90～1 00 50～7 5 18～3 0 15～2 6 14～2 4 12～2 0 10～1 6 8～12