CN104176986A - Low-noise asphalt pavement mixture and pavement construction quality control method - Google Patents

Abstract

The invention discloses a low-noise asphalt pavement mixture which is composed of the following components in percentage by mass: 40-50% of basalt 10-15, 40-50% of basalt 5-10, 2-10% of stone dust, 2-6% of lime rock machine-made sand, less than 5% of ore powder, 0.2-0.6% of fiber and 6.0-7.0% of asphalt, totaling 100%. The size distribution of the ores is as follows: the percent of ores passing through a 16mm square mesh sieve is 100%, the percent of ores passing through a 13.2mm square mesh sieve is 86-100%, the percent of ores passing through a 9.5mm square mesh sieve is 56-74%, the percent of ores passing through a 4.75mm square mesh sieve is 11-25%, the percent of ores passing through a 2.36mm square mesh sieve is 6-10%, the percent of ores passing through a 0.075mm square mesh sieve is 2-4%, and the void volume of the mixture is 18-20%. The pavement prepared by the asphalt mixture has the advantage of low noise.

Description

A kind of low noise asphalt pavement mixture and construction quality of pavement control method

Technical field

The invention belongs to bituminous pavement manufacture technology field, relate to a kind of low noise asphalt pavement mixture and construction quality of pavement control method.

Background technology

Along with the fast development of transportation, the traffic noise that large vehicle flowrate, high speed traveling cause has become the main pollution form of puzzlement resident living, also receives increasing concern.Noise nuisance is very large, affects on the one hand people's mental status, makes people be difficult to concentrate on work, causes insomnia, palpitates quickly and stress etc.; Can damage auditory system on the other hand, cause of short duration or long-term hearing disability, and long-term in noisy environment, more can improve the probability of stomach ulcer, hypertension or phrenoplegia.Therefore the harm that how effectively to reduce traffic noise has become a road worker difficult problem urgently to be resolved hurrily.

Highway and urban road noise are the Main Noise Sources of traffic noise, almost occupy noise and complain the more than 55% of total amount.And these noises mainly stem from the frictional noise on the vibratory noise of vehicle own and wheel and road surface.Vehicle in while running at a low speed traffic noise mainly by generations such as engine, wheel casing, import and export blowdown system and body vibrations.When the speed of a motor vehicle surpasses 50km/h, the noise that wheel and road interaction produce will be occupied an leading position.Frictional noise between bus or train route is mainly that the rolling noise being produced by wheel and road produces, its size with the macrostructure on road surface, the decorative pattern of vehicle tyre and characteristic are relevant.From road surface angle, bituminous pavement is less than the rolling noise of the cement concrete pavement of same level.This is mainly because of the larger gap structure of asphalt and lower modulus, make it possess preferably sound-absorbing effect and low impedance, and the space of low noise asphalt is more flourishing, sound-absorbing effect is better, so low noise bituminous pavement will become the main flow of Noise Reduction Pavement.

China in the research of low noise bituminous pavement and application still in the starting stage.Present stage, China's specification recommends low noise asphalt Mineral Aggregate grading limit, require voidage 20% left and right, asphalt content is in 4.5% left and right, and the loss of dispersing reaches 13% left and right, but the poor durability of this asphalt, large space is easily stopped up by dust, loses the effect of noise reduction.Patent CN101187193A discloses a kind of half-flexible water drainage skid-free noise-reducing road surface pavement structure, using high-viscosity modified asphalt as surface abrasion layer agglutinate, and at each layer of spreading high-viscosity modified asphalt tack coat, strengthen interlaminar bonding, improve the stability of paving structure, but this patent does not form and is optimized to the material of low noise asphalt.The permeable noise reduction technology of the disclosed Novel thin layer polymer flexibility of patent CN 102108665A cement concrete is mainly paid close attention to the noise reduction problem of cement pavement, does not relate to bituminous pavement.In the disclosed dewatering and noise reduction bituminous concrete pavement of patent CN 102134825A technology, described precipitation Noise Reduction Pavement layer is with traditional grading limit design noise reduction asphalt, and such asphalt still exists the poor defect of weather resistance.Therefore, this patent is on forefathers' Research foundation, a kind of low noise bituminous pavement compound that improves mineral aggregate gradation scope is proposed, the dispersing of asphalt of usining lost as material abrasion resisting index, pay close attention to the weather resistance of material, the low noise asphalt pavement mixture that design performance is good, and its quality controlling means is proposed.

Summary of the invention

The object of the present invention is to provide a kind of low noise asphalt pavement mixture, the noise that its asphaltic road-mix surface course that has solved existing traditional design method acquisition produces is large, easily causes the problem of noise pollution.

Another object of the present invention is to provide the Asphalt Pavement Construction Quality control method of this kind of compound.

Technical scheme of the present invention is that the mass percent of moiety is: basalt 10-15 is 40-50%, basalt 5-10 is 40-50%, aggregate chips is 2-10%, limestone Machine-made Sand is 2-6%, breeze is less than 5%, fiber 0.2-0.6%, asphalt content 6.0-7.0%, the mass percent summation of above each moiety is 100%.

Further, described basalt 10-15, basalt 5-10, aggregate chips, limestone Machine-made Sand and breeze gradation composition are: by 16mm square hole sieve is 100%, by 13.2mm square hole sieve is 86-100%, by 9.5mm square hole sieve is 56-74%, by 4.75mm square hole sieve is 11-25%, by 2.36mm square hole sieve be 6-10%, by 0.075mm square hole sieve be 2-4%, mixture gap rate is 18-20%.

Further, described fiber is lignin fibre or other mineral fibres.

Further, described pitch is the high-polymer modified pitch that high adhered modification pitch or 60 ℃ of kinetic viscosities are not less than 10000Pa.s.

According to asphalt described in claim 1, carry out the quality controlling means of pavement construction, according to following steps, carry out:

Step 1: site operation quality controlling means is;

(1) in construction, the allowance of sieve aperture and standard sieve aperture is: 0.075mm sieve is for ± 1%, 2.36mm sieve is for ± 1%, 4.75mm sieve is for ± 2%, and the sieve that is greater than 9.5mm is ± 4%;

(2) extracting screening asphalt content tolerance is ± 0.1%;

(3) mix and stir control: SBS modifying asphalt Heating temperature is 165 ℃--170 ℃, if adopt other class high-polymer modified pitchs can suitably improve Heating temperature.Mineral aggregate Heating temperature is 180 ℃--and 190 ℃, the asphalt temperature of dispatching from the factory is 170 ℃--and 185 ℃, compound top temperature is 195 ℃, and the temperature that paves is not less than 160 ℃, and first pressing starts temperature and is not less than 150 ℃, presses off again beginning temperature and is not less than 130 ℃;

(4) amalgamator should be equipped with special-purpose fiber charging device, directly fiber is added automatically to the mixing and stirring in pot or scale hooper of amalgamator; The loose wadding fibrous pneumatic conveyer that should adopt is broken up material loading automatically, and drops into rear dry mixing 8-10s at mineral aggregate, then drops into breeze and pitch, sprays into the wet-mixing time 30-35s after pitch; The asphalt mixing and stirring should be used immediately, in the time of need depositing in storage bin, take that not occur that pitch analyses be Lou degree, and must not be stored to second day and use.

Step 2: asphalt shipping mass control method;

(1) material mover is before starting transportation, brushing one deck oil-water mixture on compartment and base plate, make compound unlikely with compartment bonding;

(2) material mover all should be added a cover tarpaulin in transportation, in case duricrust is formed in the cooling of surperficial compound;

(3) material mover in transit, must not arbitrarily rest;

(4) the necessary evacuation of material mover discharging, as find that there is remaining residue, should remove in time;

(5), after material mover is reached the spot, the temperature of asphalt must not be lower than the requirement of the temperature that paves;

Step 3: the paving process quality controlling means of asphalt;

(1) with hard broom or power tool cleaning road surface, while having earth to stain, while clean, use high pressure water flushing wash clean, and after moisture in entering road surface evaporates making;

(2) before paver starts making, reply screed is preheated to more than 100 ℃, starts vibration or the knocking tamping unit of screed in paving process;

(3) speed of paving of asphalt should be aligned and feeding speed balance, evenly, pave uninterruptedly, random conversion rate or stop in paving process, because modifying asphalt or bituminous mixture affect amalgamator productivity, the speed of paving of paver is no more than 3-4m/min, when under feeding, should adopt material mover to concentrate waits, concentrate the mode paving, reduce the pause number of times of paver as far as possible, now paver all should spread remaining compound at every turn, carry out interim joint, as waited material overlong time, mixture temperature reduces, the hard one-tenth of surface knot duricrust, when impact continues to pave, duricrust must be removed,

(4) coefficient of loose laying of asphalt is 1.15-1.30;

(6) can not be the in the situation that of rainy day or lower floor's humidity making asphaltic road-mix surface course.

The invention has the beneficial effects as follows that the pavement noise that adopts this kind of bituminous material to make is little.

Accompanying drawing explanation

Fig. 1 is that asphalt seepage rate and 4.75mm sieve aperture percent of pass are related to schematic diagram;

Fig. 2 is that asphalt is analysed Lou and 4.75mm sieve aperture percent of pass is related to schematic diagram;

Fig. 3 is that Air Voids of Asphalt Mixtures and 4.75mm sieve aperture percent of pass are related to schematic diagram;

Fig. 4 is that asphalt VCA and 4.75mm sieve aperture percent of pass are related to schematic diagram;

Fig. 5 is that Air Voids of Asphalt Mixtures and asphalt content are related to schematic diagram;

Fig. 6 is that asphalt is analysed leakage quantity and asphalt content is related to schematic diagram;

Fig. 7 is asphalt loss and the asphalt content relation schematic diagram that disperses;

Fig. 8 is that asphalt seepage rate and asphalt content are related to schematic diagram;

Fig. 9 is that asphalt mixture bulk density and asphalt content are related to schematic diagram.

Embodiment

Technical scheme of the present invention is that Structure of Asphalt Pavement with Lower Noise layer be take porousness asphalt as material, and quality control is carried out in working-yard.Described porousness asphalt is comprised of coarse aggregate, fine aggregate, filler and pitch, and wherein coarse aggregate, fine aggregate and filler are referred to as Mineral Aggregate.

The weight part of each component of porousness asphalt is: fiber 0.2-0.6%; Asphalt content 6.0-7.0%, determines optimum value with mix-design; Basalt 10-15 is 40-50%; Basalt 5-10 is 40-50%; Aggregate chips is 2-10%; Limestone Machine-made Sand is 2-6%; Breeze is less than 5%.

More than in formula, Mineral Aggregate is that the gradation composition of described basalt 10-15, basalt 5-10, aggregate chips, limestone Machine-made Sand and breeze is: the mineral aggregate by 16mm square hole sieve is 100%, mineral aggregate by 13.2mm square hole sieve is 86-100%, mineral aggregate by 9.5mm square hole sieve is 56-74%, mineral aggregate by 4.75mm square hole sieve is 11-25%, mineral aggregate by 2.36mm square hole sieve is 6-10%, and the mineral aggregate by 0.075mm square hole sieve is 2-4%.Described porousness asphalt, target mix design voidage is 18-20%, to analyse Lou, to disperse loss and seepage rate, control the performance of asphalt, detect high-temperature stability, low-temperature cracking-resistance and the water stability of pitch simultaneously, make it meet China < < standard specification for construction and acceptance of highway asphalt pavement > > F40-2004.Filler also comprises fiber, fiber consumption 0.4% left and right.Described bituminous cements is the high-polymer modified pitch that high adhered modification pitch or 60 ℃ of kinetic viscosities are not less than 10000Pa.s.

Site operation quality controlling means is: in (1) construction, the allowance of sieve aperture and standard sieve aperture is: 0.075mm sieve is for ± 1%, 2.36mm sieve is for ± 1%, 4.75mm sieve is for ± 2%, and the sieve that is greater than 9.5mm is ± 4%.(2) extracting screening asphalt content tolerance is ± 0.1%.(3) mix and stir control: SBS modifying asphalt Heating temperature is 165 ℃--170 ℃, other class high-polymer modified pitchs can suitably improve Heating temperature, to guarantee that pitch has good flow state; Mineral aggregate Heating temperature is 180 ℃--190 ℃, the asphalt temperature of dispatching from the factory is 170 ℃--185 ℃, compound top temperature (discarded temperature) is 195 ℃, the temperature that paves is not less than 160 ℃, first pressing starts temperature and is not less than 150 ℃, press off again beginning temperature and be not less than 130 ℃, amalgamator should be equipped with special-purpose fiber charging device, directly fiber is added automatically to the mixing and stirring in pot or scale hooper of amalgamator; The loose wadding fibrous pneumatic conveyer that should adopt is broken up material loading automatically, and drops into rear dry mixing 8-10s at mineral aggregate, then drops into breeze and pitch, sprays into the wet-mixing time 30-35s after pitch; The asphalt mixing and stirring should be used immediately, in the time of need depositing in storage bin, take that not occur that pitch analyses be Lou degree, and must not be stored to second day and use.

Asphalt shipping mass control method: (1) low noise asphalt should adopt the transportation of large-tonnage material mover.Material mover before starting transportation, should be on compartment and base plate brushing one deck oil-water mixture, make compound unlikely with compartment bonding.(2) in any case, material mover all should be added a cover tarpaulin in transportation, in case duricrust is formed in the cooling of surperficial compound.(3) material mover in transit, must not arbitrarily rest.(4) the necessary evacuation of material mover discharging, as find that there is remaining residue, should remove in time.(5), after material mover is reached the spot, answer the temperature of close inspection asphalt, must not be lower than the requirement of the temperature that paves.

The paving process quality controlling means of asphalt: (1), with hard broom or power tool cleaning road surface, while having the filths such as earth to stain, uses high pressure water flushing wash clean while should clean, and after moisture in entering road surface evaporates making.(2) paver starts reply screed before making and is preheated to more than 100 ℃, should start the tamping units such as the vibration of screed or knocking in paving process.(3) speed of paving of asphalt should be aligned and feeding speed balance, must be evenly, pave uninterruptedly.Random conversion rate or stop in paving process.Because modifying asphalt or bituminous mixture affect amalgamator productivity, the speed of paving of paver should slow down, and is conventionally no more than 3-4m/min, allows and slows down to 1-2m/min.When under feeding, should adopt material mover to concentrate and wait, concentrate the mode paving, reduce the pause number of times of paver as far as possible.Now paver all should spread remaining compound at every turn, carries out interim joint.As waited, expect overlong time, mixture temperature reduces, and the hard one-tenth of surface knot duricrust, when impact continues to pave, must remove duricrust.(4) check the temperature that paves of asphalt constantly.(5) coefficient of loose laying of asphalt should be spread and be determined by examination, is generally 1.15-1.30.(6) must not be the in the situation that of rainy day or lower floor's humidity making asphaltic road-mix surface course.

Described asphalt compacting process is controlled: after (1) bituminous mixture laying, must, followed by starting to roll under the state of temperature high as far as possible, must not wait.Except adding of short duration the having a rest such as water of necessity, street roller each stage roll process in should carry out uninterruptedly.Simultaneously also must not be under low temperature state rolled asphalt compound repeatedly, grind off building stones corner angle or crush building stones preventing, destroy the embedded squeezing of gathering materials.Rolling temperature should meet the requirements.(2) first pressing of asphalt adopts rigidity to grind to shake by force twice, the length of first nip by calculative determination in case with the speeds match of paver, generally should not be greater than 20m.Multiple pressure should, immediately following carrying out after first pressing, adopt rigidity stone roller to shake and press twice.Final pressure adopts rigidity to grind static pressure one time, to eliminate wheelmark (must control well compacting temperature).(3) vibroll rolled asphalt compound should be followed the principle of " immediately following, slow pressure, high frequency, by a narrow margin ".Be that street roller must be immediately following rolling after paver, it is slow that rolling speed is wanted, and evenly, and take the mode of high frequency, short arc to roll.(4) street roller should be pushed ahead and rolls immediately following paver, rolls segment length substantially identical, turns back after rolling in front of paver at every turn and rolls.The rolling speed of asphalt must not surpass 5km/h.(5) asphalt should prevent overrolling, and it is 20% that the voidage of on-site sampling is controlled.(6) in order to prevent from that compound from sticking on wheel, should suitably sprinkle water making wheel to keep moistening, can a small amount of clean-out system of admixture in water, but should strictly control the water yield, to take sticky wheel be degree, and water spray must be vaporific, must not adopt the street roller of gravity flow watering.(7) must not adopt pneumatic-tired rollers to roll.

The invention has the beneficial effects as follows:

(1) optimum asphalt content of mineral aggregate gradation scope design is more than 6%, and disperse, to be lost in 6% left and right, and indices is better than traditional method of design.

(2) described lower noise asphalt, asphalt content increases, and traditional method of design asphalt content is about 4.5% left and right, and low noise asphalt asphalt content provided by the invention is about 6%, improves weather resistance.

(3) new improved method of design index is better than traditional method of design, the loss of dispersing of particularly major control index, and traditional method is 13% left and right, and new improved method is about 6%, has improved the raveling resistance of Low Noise Pavement.

(4) in the less situation of vehicle flowrate (243/h), traffic noise equivalent continuous A sound level has reduced 4.2dB, and Statistics sound level L50 has reduced 5.6dB, and noise reduction is obvious.According to acoustic theory, when vehicle flowrate is high, noise reduction can be better.

(5) for guaranteeing Low Noise Pavement quality, inquired into Low Noise Pavement constructional method, facts have proved that these methods are science, effective.

(6) porousness Low Noise Pavement excellent noise reduction effect not only, and drainage performance, non-skid property, the dazzle of anti-road surface etc. are all better than plain asphalt road surface, have good popularizing application prospect.

Specific embodiments of the invention are:

Case study on implementation 1: prepare porousness asphalt with Mineral Aggregate, pitch and fiber.Select three gratings (thin, in, thick), asphalt content is 6.0%, and fiber amount of filling is 0.4%, manufactures marshal piece (two-sided respectively hitting 50 times).Formate gradation composition 1: basalt 10-15 is 39%; Basalt 5-10 is 47%; Aggregate chips is 8%; Limestone Machine-made Sand is 3%; Breeze is 3%.Formate gradation composition 2: basalt 10-15 is 43%; Basalt 5-10 is 47%; Aggregate chips is 4%; Limestone Machine-made Sand is 3%; Breeze is 3%.Formate gradation composition 3: basalt 10-15 is 47%; Basalt 5-10 is 47%; Aggregate chips is 0%; Limestone Machine-made Sand is 3%; Breeze is 3%.With above-mentioned three kinds of gratings, prepare asphalt, with Marshall method of design design porousness asphalt, every group of marshal piece volumetric parameter is in Table 1.

Every group of marshal piece relevant parameters of table 1

Each index and 4.75mm sieve aperture pass through percentile relation as shown in Figure 1,2,3, 4.According to above-mentioned test-results, selecting formate gradation composition 2 is optimum gradation.

Case study on implementation 2: in described case study on implementation 1, formate gradation composition 2 is optimum gradation, asphalt content is respectively 6.0%, 6.3%, 6.6%, fibre content is to make marshal piece (two-sided respectively hitting 50 times) in 0.4% situation, records each index as table 2, Fig. 5, Fig. 6, Fig. 7, Fig. 8 and Fig. 9.

Table 2 marshal piece test index

Target mix design voidage is selected 18% left and right, and asphalt content is decided to be 6.2%, and other index (analyse Lou, disperse loss and seepage rate etc.) all meets the demands, and density is maximum.

Case study on implementation 3: form design porousness asphalt with the asphalt mixture material in case 1 and 2, its Asphalt Content is 6.2%, and fiber consumption is 0.4%, carries out wheel tracking test and freeze thawing split test, the results are shown in Table 3.With this porousness asphalt making Experiment Road, and analyze mixing building sample, wherein analyse Lou test in Table 4, on-the-spot voidage the results are shown in Table 5 (maximum theory density is 2.546) with dispersing.

Table 3 rut and freeze thawing split test result

Index	Freeze thawing splitting (TSR) (%)	Dynamic stability (inferior/mm)	Low temperature damage strain (ε μ)
				Trial value	104	7941	3000

Table 4 is analysed leakage test-results

Sample	Analyse Lou (%)
		Sample 1	0.11
Sample 2	0.07

Table 5 Superpave mix-design test-results

Test specimen	The loss (%) of dispersing	Core bulk density (Corelok)	On-the-spot voidage (%)
				Test specimen 1	9.13	2.111	17.1
Test specimen 2	6.78	2.092	17.8
				Test specimen 3	7.63	2.031	20.2
Test specimen 4	9.23	2.029	20.3

By finding out above, under the prerequisite of interspaces rate 20%, the optimum asphalt content of new improved mineral aggregate gradation scope design is more than 6%, and major control index disperses and be lost in 6% left and right, and indices is better than traditional method of design.

Case study on implementation 4: the porousness asphalt making low noise pavement by case study on implementation 3, is applied to Jinan-Liaocheng motorway.And test section is carried out to traffic noise test, contrast with traditional road surface.

Point position a: measuring point is respectively selected on two kinds of road surfaces, measuring point is positioned at curb anticollision barrier place, and two measuring point terrain clearances are with identical from runway distance.

Monitoring equipment: HS6288D type sound-level meter, by specifications of surveys requirement, before and after measuring, all proofread and correct.For preventing that accidentalia (as instrument failure, vehicle whistle etc.) is on measuring impact, each measuring point is arranged two same model sound-level meters.

Monitoring time: press code requirement monitoring 20 minutes.Because this section of Low Noise Pavement is only laid on a side of highway, while therefore measuring, need, by opposite side highway temporary enclosed, for reducing the impact of measuring traffic, not carry out replicate measurement.

Monitoring result: the supporting HS4784 type of sound-level meter printer automatic printing for take off data, measuring result is in Table 6.The vehicle flowrate that measurement is recorded is simultaneously in Table 7.

Table 6 prevailing roadway and Low Noise Pavement traffic noise measurement of comparison (dB (A))

Point position	LAeq	L10	L50	L90	SD
						Prevailing roadway	77.6	78.4	58.5	42.5	13.1
Low Noise Pavement	73.4	74.0	52.9	39.4	13.0
						Noise reduction	4.2	4.4	5.6	－	－

Vehicle flowrate during table 7 noise monitoring ()

?	Large car	In-between car	Compact car	Add up to	Hour vehicle flowrate
						Fast	7	9	30	46	138
Runway	16	8	11	35	105
						Add up to	23	17	41	81	243

From monitoring data, institute's making Low Noise Pavement is in 243/hour situations, to have 4.2dB (A) noise reduction at vehicle flowrate, has reached design objective.According to equivalent continuous A sound level definition, when vehicle flowrate increases, noise reduction has further raising.

Claims (4)

1. a low noise asphalt pavement mixture, the mass percent that it is characterized in that moiety is: basalt 10-15 is 40-50%, basalt 5-10 is 40-50%, aggregate chips is 2-10%, limestone Machine-made Sand is 2-6%, and breeze is less than 5%, fiber 0.2-0.6%, asphalt content 6.0-7.0%, the mass percent summation of above each moiety is 100%.

2. according to a kind of low noise asphalt pavement mixture described in claim 1, it is characterized in that: described basalt 10-15, basalt 5-10, aggregate chips, limestone Machine-made Sand and breeze gradation composition are: by 16mm square hole sieve is 100%, by 13.2mm square hole sieve is 86-100%, by 9.5mm square hole sieve is 56-74%, by 4.75mm square hole sieve is 11-25%, by 2.36mm square hole sieve is 6-10%, by 0.075mm square hole sieve be 2-4%, mixture gap rate is 18-20%.

3. according to asphalt described in claim 1, it is characterized in that: described pitch is the high-polymer modified pitch that high adhered modification pitch or 60 ℃ of kinetic viscosities are not less than 10000Pa.s.

4. according to asphalt described in claim 1, carry out the quality controlling means of pavement construction, it is characterized in that carrying out according to following steps:

Step 1: site operation quality controlling means is;

(1) in construction, the allowance of sieve aperture and standard sieve aperture is: 0.075mm sieve is for ± 1%, 2.36mm sieve is for ± 1%, 4.75mm sieve is for ± 2%, and the sieve that is greater than 9.5mm is ± 4%;

(2) extracting screening asphalt content tolerance is ± 0.1%;

(3) mix and stir control: SBS modifying asphalt Heating temperature is 165 ℃--170 ℃, mineral aggregate Heating temperature is 180 ℃--190 ℃, the asphalt temperature of dispatching from the factory is 170 ℃--185 ℃, compound top temperature is 195 ℃, the temperature that paves is not less than 160 ℃, first pressing starts temperature and is not less than 150 ℃, presses off again beginning temperature and is not less than 130 ℃;

(4) amalgamator should be equipped with special-purpose fiber charging device, directly fiber is added automatically to the mixing and stirring in pot or scale hooper of amalgamator; The loose wadding fibrous pneumatic conveyer that should adopt is broken up material loading automatically, and drops into rear dry mixing 8-10s at mineral aggregate, then drops into breeze and pitch, sprays into the wet-mixing time 30-35s after pitch; The asphalt mixing and stirring should be used immediately, in the time of need depositing in storage bin, take that not occur that pitch analyses be Lou degree, and must not be stored to second day and use;

Step 2: asphalt shipping mass control method;

(1) material mover is before starting transportation, brushing one deck oil-water mixture on compartment and base plate, make compound unlikely with compartment bonding;

(2) material mover all should be added a cover tarpaulin in transportation, in case duricrust is formed in the cooling of surperficial compound;

(3) material mover in transit, must not arbitrarily rest;

(4) the necessary evacuation of material mover discharging, as find that there is remaining residue, should remove in time;

(5), after material mover is reached the spot, the temperature of asphalt must not be lower than the requirement of the temperature that paves;

Step 3: the paving process quality controlling means of asphalt;

(1) with hard broom or power tool cleaning road surface, while having earth to stain, while clean, use high pressure water flushing wash clean, and after moisture in entering road surface evaporates making;

(2) before paver starts making, reply screed is preheated to more than 100 ℃, starts vibration or the knocking tamping unit of screed in paving process;

(3) speed of paving of asphalt should be aligned and feeding speed balance, evenly, pave uninterruptedly, random conversion rate or stop in paving process, because modifying asphalt or bituminous mixture affect amalgamator productivity, the speed of paving of paver is no more than 3-4m/min, when under feeding, should adopt material mover to concentrate waits, concentrate the mode paving, reduce the pause number of times of paver as far as possible, now paver all should spread remaining compound at every turn, carry out interim joint, as waited material overlong time, mixture temperature reduces, the hard one-tenth of surface knot duricrust, when impact continues to pave, duricrust must be removed,

(4) coefficient of loose laying of asphalt is 1.15-1.30;

(5) must not be the in the situation that of rainy day or lower floor's humidity making asphaltic road-mix surface course.