CN102795813A - Dense-graded asphalt concrete with continuous skid-resistant and noise-reduction functions - Google Patents

Abstract

The invention relates to a dense-graded asphalt concrete with continuous skid-resistant and noise-reduction functions. The dense-graded asphalt concrete is prepared from a coarse aggregate, a fine aggregate, packing and asphalt according to the matching requirements of dense-graded asphalt concrete. The dense-graded asphalt concrete is characterized in that the coarse aggregate comprises the following components in percentage by weight: 0-50% of common coarse aggregate and 50-100% of functional aggregate, wherein the functional aggregate is of a core-shell structure and composed of a porous core matrix and an alkaline surface activated shell layer, the porous core matrix takes mullite as a main ore phase and formed into a continuous phase, air holes are distributed in the continuous phase, the diameters of the air holes are distributed in a multistage mode, and the small holes mainly include micron small holes; and the ore phase of the alkaline surface activated shell layer mainly comprises dicalcium silicate, tricalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite. The dense-graded asphalt concrete disclosed by the invention is good in bearing capacity, excellent in water damage resistance and continuous skid-resistant and noise-reduction functions and good in durability, and has a broad application prospect.

Description

A kind of dense-graded asphalt concrete with lasting antiskid decrease of noise functions

Technical field

The invention belongs to the pavement construction material field, be specifically related to a kind of dense-graded asphalt concrete with lasting antiskid decrease of noise functions.

Background technology

That bituminous concrete pavement has is smooth, attractive in appearance, anti-dazzle, be prone to characteristics such as repairing, uses increasingly extensive.Yet the cling property of bituminous concrete pavement is polished along with gathering materials and progressively reduces, and has had a strong impact on the security of vehicle ' thus.To this problem; The at present main basalt aggregate that adopts hard wear resistant replaces ls or the grouan preparation bituminous concrete that gathers materials; But the same ganoid problem in polishing back of gathering materials that exists of basalt aggregate, the region that while Irish touchstone distributes is stronger, and material cost is higher.Adopt open gradation wearing course (OGFC) though the effect of certain anti-skidding, sound absorption, noise reduction has been played on the road surface, OGFC road surface bearing capacity is not enough, poor durability; Must use full-bodied pitch simultaneously, cost is higher, is unfavorable for promoting the use of; And same exist to gather materials make the problem that cling property can not be permanent because of polishing; Simultaneously its surperficial perforate hole is prone to by the foreign material shutoff, and easy to clean not, the problem that exists anti-acoustic capability not keep lastingly.

Summary of the invention

Technical problem to be solved by this invention is to be polished along with gathering materials and the perforate hole problem of decay by shutoff and gradually to the anti-skidding anti-acoustic capability of bituminous concrete pavement, and a kind of dense-graded asphalt concrete with lasting antiskid anti-acoustic capability is provided.

In order to solve the problems of the technologies described above, the technical scheme that the present invention adopts is:

A kind of dense-graded asphalt concrete with lasting antiskid decrease of noise functions, it is formulated to be selected materials according to the dense-graded asphalt concrete ratio requirement by coarse aggregate, fine aggregate, filler and pitch, it is characterized in that: described coarse aggregate by common coarse aggregate and functional aggregate by volume per-cent count: common coarse aggregate 0～50%; Functional aggregate 50～100% is formed; Wherein, described functional aggregate is a nucleocapsid structure, is made up of porous kernel matrix and basic surface activation shell; Described porous kernel matrix is that main mine forms external phase mutually with the mullite; Be distributed with pore in the external phase, described air vent aperture is multistage distribution, and is main with the micron order aperture; The ore deposit phase composite of described basic surface activation shell is mainly Dicalcium Phosphate (Feed Grade), tricalcium silicate, tricalcium aluminate, celite.

Press such scheme, said dense-graded asphalt concrete is preferably according to AC-10, and AC-13 or AC-16 dense-graded asphalt concrete carry out proportioning.

Press such scheme; The ore deposit phase composite of porous kernel matrix is mainly mullite, trichroite and alpha-quartz in the said functional aggregate, and its shared mass percent is respectively: mullite 55%～70%, trichroite 10%～15%; Alpha-quartz 15%～35%, surplus are other; The ore deposit phase composite of said basic surface activation shell is mainly Dicalcium Phosphate (Feed Grade), tricalcium silicate, tricalcium aluminate, celite; Its shared mass percent is respectively: Dicalcium Phosphate (Feed Grade) 15%～23%; Tricalcium silicate 42%～55%; Tricalcium aluminate 6%～15%, celite are 8%～18%, and surplus is other.

Press such scheme, said functional aggregate is a spherical particle, and particle diameter is 5-20mm, and wherein the diameter of porous kernel matrix is 4～15mm, and the thickness of outside basic surface activation shell is 1～5mm.

Press such scheme, the preparation method of said functional aggregate is: with matrix raw material ball milling, add water, mix, seal old, pelletizing forming; Then basic surface active layer powder is evenly wrapped up in outside the matrix of pelletizing forming, post forming obtains wrapping up the sample of surface active layer, be dried to constant weight then after, 1150 ℃～1250 ℃ insulations are burnt till cooling fast again and are got;

Described matrix raw material are by weight by 20-40 part flyash, 20-40 part kaolin, 10-16 part shale, 8-12 part talcum powder and 6-16 part silica powder, make its mixture by the mass percentage content of each component of oxide compound be through calculation control: SiO ₂55%～65%, Al ₂O ₃18%～25%, Fe ₂O ₃+ FeO is less than 10%, and CaO+MgO is 4%～6%, K ₂O+Na ₂O is 1.5%～4.0%, and loss on ignition is 2%～6% to get;

Described basic surface active layer powder is a Portland clinker, and the rate value is KH=0.8～0.96, SM=1.9～2.4, IM=1.1～1.6.

Press such scheme, the add-on of said water is the 20-30wt% of matrix raw material; The mass ratio of said basic surface active layer powder and matrix raw material is 15%～20%.

Press such scheme, the ball milling time of said matrix raw material is 2～6 hours, and the granularity of matrix raw material is 300～400 orders behind the ball milling; Said basic surface active layer powder is to be that the 300-400 order gets through grinding 2-6h to granularity.

Press such scheme, the old time of described sealing is 2-3h; Described drying temperature is 105 ℃～110 ℃.

Press such scheme, described insulation firing time is 15-30min.

Press such scheme, described quick cooling is under reducing atmosphere, to carry out.

Press such scheme, described reducing atmosphere is to be that 1.2～1.5: 1 liquid mixture prepared is sprayed onto and does not also begin to carry out getting on the refrigerative functional aggregate by water and coal dust by mass ratio.

Press such scheme, described common coarse aggregate is one or more the mixing in ls, diabase, the Irish touchstone.

Press such scheme, described fine aggregate is one or more the mixing in river sand, machine-processed sand or the aggregate chips.

Press such scheme, described filler is one or more the mixing in breeze, lime or the cement.

Press such scheme, described pitch is A70 heavy traffic paving asphalt or A90 heavy traffic paving asphalt or SBS I-D type modifying asphalt.

Press such scheme, the level proportioning of described dense-graded asphalt concrete is the nominal mix proportion P that obtains according to the dense-graded asphalt concrete standard _ViConvert quality mixture ratio P into according to following conversion formula (1) _MiCarry out proportioning:

$P_{\mathrm{Mi}}=\frac{P_{\mathrm{Vi}}\×{\mathrm{\γ}}_i}{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{P}_{\mathrm{Vi}}\×{\mathrm{\γ}}_i}$ Formula (1)

In the formula: P _MiQuality mixture ratio/the % of-certain mineral aggregate composition;

P _ViNominal mix proportion/the % of-certain mineral aggregate composition;

γ _iThe corresponding gross volume specific density of-certain mineral aggregate.

The inner porous of the functional aggregate that uses in the dense-graded asphalt concrete of the present invention has higher sound absorbing coefficient and lower Young's modulus, can play the effect of noise reduction vibration damping.The surface active layer that has of this functional aggregate surface is alkalescence in addition, can increase this functional aggregate and bituminous adhesive power.The present invention is through the dense-graded asphalt concrete of this functional aggregate preparation of in coarse aggregate, mixing; Compare with common coarse aggregates such as only using Irish touchstone or ls; Under its effect repeatedly of wheel in use; Can expose micro-pore gradually, remain surface, and can not be polished as the bituminous concrete of coarse aggregates such as Irish touchstone or ls preparation with a large amount of rough grains; Make the dense-graded asphalt concrete that makes have higher sound absorbing coefficient and good noise reduction thus, also have good bearing capacity and weather resistance simultaneously.

The invention has the beneficial effects as follows: the intensive bituminous concrete of joining provided by the invention has good bearing capacity, good anti-water damage property and lasting antiskid decrease of noise functions, and good endurance is with a wide range of applications.

Description of drawings

Fig. 1 is preparation technology's schema of functional aggregate;

Fig. 2 is the SEM test pattern of functional aggregate porous kernel matrix;

Fig. 3 is the XRD analysis figure of porous kernel matrix;

Fig. 4 is the XRD analysis figure of outside basic surface active layer shell.

Embodiment

In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to following embodiment.

The raw material that uses among the following embodiment is following:

(1) functional aggregate: embodiment 11-13 is seen in the preparation of functional aggregate.

(2) pitch: A70 heavy traffic paving asphalt or A90 heavy traffic paving asphalt or SBS I-D type modifying asphalt, quality meet " asphalt highway construction technique normalizing (JTG F40-2004) ".

Table 1 pitch the key technical indexes

^*Probe temperature is 15 ℃, ^*Probe temperature is 5 ℃.

(3) common coarse aggregate: ls or diabase or Irish touchstone, quality meet " asphalt highway construction technique normalizing (JTGF40-2004) ".

The common coarse aggregate technical indicator of table 2

(4) fine aggregate: river sand or machine-processed sand or aggregate chips, quality meet " asphalt highway construction technique normalizing (JTGF40-2004) ".

Table 3 fine aggregate technical indicator

(5) filler: breeze or lime or cement, quality meet " asphalt highway construction technique normalizing (JTGF40-2004) ".

Table 4 packing technique index

Embodiment 1

(1) screening of mineral aggregate: various mineral aggregates are sieved by " asphalt highway construction technique normalizing (JTG F40-2004) ".Pitch is SBS I-D modifying asphalt, and coarse aggregate all adopts the functional aggregate of embodiment 11 preparations, and fine aggregate is machine-processed sand and aggregate chips, and filler is a breeze.

(2) mensuration of mineral aggregate density: apparent relative density and the gross volume specific density of measuring various mineral aggregates by " asphalt highway construction technique normalizing (JTG F40-2004) ".

(3) carry out mineral aggregate gradation design by " asphalt highway construction technique normalizing (JTG F40-2004) ", and the grating that will obtain thus likens the nominal mix proportion into various mineral aggregates to, then according to following formula, with the nominal mix proportion (P of each mineral aggregate _Vi) convert quality mixture ratio (P into _Mi).

$P_{\mathrm{Mi}}=\frac{P_{\mathrm{Vi}}\×{\mathrm{\γ}}_i}{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{P}_{\mathrm{Vi}}\×{\mathrm{\γ}}_i}$ Formula (2)

In the formula: P _MiQuality mixture ratio/the % of-certain mineral aggregate composition;

P _ViNominal mix proportion/the % of-certain mineral aggregate composition;

γ _iThe corresponding gross volume specific density of-certain mineral aggregate.

(4) combine dense-graded asphalt concrete model AC-13, estimating bitumen aggregate ratio according to engineering experience is 6.0%, in ± 1% scope, evenly chooses 5 points then; Promptly 5.0%; 5.5%, 6.0%, 6.5%; 7.0%, carrying out the Marshall experiment then and calculating best bitumen aggregate ratio OAC by " asphalt highway construction technique normalizing (JTG F40-2004) " is 6.2%; Under this best bitumen aggregate ratio, carry out wheel tracking test, freeze thawing split test, the test of immersion residual stability respectively according to the experimental technique in the standard " highway engineering pitch and asphalt testing regulation JTJ 052-2000 "; Each test index meet the specifications requirement; Confirm that thus best bitumen aggregate ratio is 6.2%, concrete freeze thawing cleavage strength ratio and immersion residual stability are seen table 7.

(5) adopt as above mineral aggregate gradation quality proportioning and best oilstone beguine according to " asphalt highway construction technique normalizing (JTGF40-2004) " system of mixing, pave and roller-compaction makes the AC-13 dense-graded asphalt concrete.

Above-mentioned concrete sample is carried out carrying out durability test after certain number of times volume of traffic simulation test, comprise cling property and anti-acoustic capability contrast (seeing table 7) before and after using.

Embodiment 2

Adopt the functional aggregate of embodiment 12 preparations, carry out mineral aggregate gradation according to dense-graded asphalt concrete AC-10, all the other are identical with embodiment 1, and its mineral aggregate volume level proportioning and best bitumen aggregate ratio are seen table 6.

Its freeze thawing cleavage strength ratio, immersion residual stability and durability test (comprising cling property and anti-acoustic capability contrast before and after using) are listed in table 7.

Embodiment 3

Adopt the functional aggregate of embodiment 13 preparations, carry out mineral aggregate gradation according to dense-graded asphalt concrete AC-16, all the other are identical with embodiment 1, and its mineral aggregate volume level proportioning and best bitumen aggregate ratio are seen table 6.

Its freeze thawing cleavage strength ratio, immersion residual stability and durability test (comprising cling property and anti-acoustic capability contrast before and after using) are listed in table 7.

Table 6AC-10, AC-13, AC-16 dense-graded asphalt concrete volume proportion

^*The OGFC-13 type asphalt of reference examples 1 adopts high adhered modification pitch, and the AC-13 type bituminous concrete of reference examples 2 adopts the SBS modifying asphalt, ^*Data are coarse aggregate nominal particle diameter scope in the bracket.

Table 7 different gradation bituminous concrete performance comparison

^*Coefficient of sliding resistance performance and initial value contrast after 5 years are used in the road surface, ^*Noise figure and initial value contrast after 5 years are used in the road surface

Embodiment 4～6

Coarse aggregate is chosen by functional aggregate in the table 8 and common coarse aggregate separately volume proportion in mineral aggregate; Convert according to the formula among the embodiment 1 (1) then and obtain mineral aggregate quality proportioning; Wherein: choosing according to table 8 of common coarse aggregate and fine aggregate carried out, and all the other are identical with embodiment 3.Its freeze thawing cleavage strength ratio, immersion residual stability and durability test (comprising cling property and anti-acoustic capability contrast before and after using) are listed in table 9.

The AC-16 dense-graded asphalt concrete proportioning of table 8 Different Coarse Aggregates proportioning

The AC-16 dense-graded asphalt concrete performance of table 9 Different Coarse Aggregates proportioning relatively

^*Coefficient of sliding resistance performance and initial value contrast after 5 years are used in the road surface, ^*Noise figure and initial value contrast after 5 years are used in the road surface.

Associative list 8 can get with table 9: functional aggregate accounts for the dense-graded asphalt concrete that the volume ratio of coarse aggregate obtains more than or equal to preparation in 50% o'clock all can satisfy good water resistance and the antiskid anti-acoustic capability that continues.

Embodiment 7～8

Asphalt variety according in the table 10 is chosen pitch, carries out mineral aggregate gradation according to the AC-16 dense-graded asphalt concrete, and all the other are identical with embodiment 4.Its freeze thawing cleavage strength ratio, immersion residual stability and durability performance (comprising cling property and anti-acoustic capability contrast before and after using) are seen table 10.

Table 10 different pitches kind AC-16 dense-graded asphalt concrete performance comparison

^*Coefficient of sliding resistance performance and initial value contrast after 5 years are used in the road surface, ^*Noise figure and initial value contrast after 5 years are used in the road surface.

Embodiment 9～10

Specifically choose filler according to the filling kind in the table 11, carry out mineral aggregate gradation according to dense-graded asphalt concrete AC-16, all the other are identical with embodiment 7.Its freeze thawing cleavage strength ratio, immersion residual stability and durability performance (comprising cling property and anti-acoustic capability contrast before and after using) are seen table 11.

The different filler bituminous concrete of table 11 performance comparison

^*Coefficient of sliding resistance performance and initial value contrast after 5 years are used in the road surface, ^*Noise figure and initial value contrast after 5 years are used in the road surface

Embodiment 11-24: the preparation of functional aggregate:

Embodiment 11

(1) batching: carry out corresponding batching according to table 12, table 13 and table 14, the chemical constitution and the loss on ignition LOI that prepare the matrix raw material that obtain thus see table 15.

(2) grinding: the matrix raw material that prepare were put into the ball mill grinding 4 hours, and the control raw material granularity adds the water of matrix raw material 22% at 325 orders, mixes, with plastics film sealing, old 3h; With ball mill grinding 4 hours, control size is at 325 orders, and was subsequent use with surface active layer raw material.

(3) moulding:, process the bead that diameter is 5-15mm with the matrix adopting manual assembly after old (also can adopt extrusion molding).Again surface active layer powder as far as possible evenly is wrapped in matrix bead surface (can use the rotoforming mode), post forming, the quality ratio of said surface active layer powder and matrix material remains on 18%.Descend dry 4h to constant weight at 105 ℃～110 ℃ on the sample after the post forming.

(4) sintering: firing temperature is selected in 1200 ℃, and soaking time is 20min, and temperature rise rate is controlled at 5 ℃/min.

(5) cooling: cool off fast under the reducing atmosphere.Described reducing atmosphere is to be that 1.2: 1 liquid mixture prepared are sprayed onto and also do not begin to carry out getting on the refrigerative functional aggregate by water and coal dust by mass ratio.

Concrete preparation technology's flow process is as shown in Figure 1.

The functional aggregate kernel matrix for preparing is carried out the SEM test, see Fig. 2.Can be known by Fig. 2: the kernel air vent aperture is multistage distribution, and is main with the micron order aperture;

The functional aggregate particle for preparing peeled off carry out the ore deposit phase composite respectively and analyze, its kernel matrix and outside basic surface active layer XRD test result are respectively like Fig. 3 and shown in Figure 4.Can be known by Fig. 3: the kernel matrix of this functional aggregate is formed the ore deposit and is mainly mullite mutually; Trichroite and alpha-quartz can get in conjunction with the XRD test result calculations: the concrete mineral composition of kernel matrix is: mullite 64.3%, trichroite 13.24%; Alpha-quartz 22.13%, surplus are other.Can be known by Fig. 4: the ore deposit of forming of the outside basic surface active layer of this functional aggregate is mainly Dicalcium Phosphate (Feed Grade), tricalcium silicate, tricalcium aluminate, celite mutually.Can get in conjunction with the XRD test result, the concrete ore deposit phase composite of basic surface active layer is: Dicalcium Phosphate (Feed Grade) 17.34%, and tricalcium silicate 47.14%, tricalcium aluminate 9.17%, celite are 15.39%, surplus is other.

Prepared functional aggregate is carried out matrix and shell microhardness linear time base sweep analysis, and recording the surface active layer thickness is 2.45mm.

The grain compressive strength of this functional aggregate kernel matrix bead and the concrete performance of functional aggregate are seen table 14.

Embodiment 12

(1) batching: carry out corresponding batching according to table 12, table 13 and table 14, the chemical constitution and the loss on ignition LOI that prepare the matrix raw material that obtain thus see table 15.

(2) grinding: the matrix raw material that prepare were put into the ball mill grinding 4 hours, and the control raw material granularity adds the water of matrix material 30% at 325 orders, mixes, with plastics film sealing, old 2h; With ball mill grinding 4 hours, control size is at 325 orders, and was subsequent use with surfactivity layer raw material.

(3) moulding:, process the bead that diameter is 5-15mm with the matrix adopting manual assembly after old (also can adopt extrusion molding).Again surface active layer powder as far as possible evenly is wrapped in matrix bead surface (can use the rotoforming mode), post forming, the quality ratio of said surfactivity layer powder and matrix material remains on 15%.Sample after the post forming is dried to constant weight under 105 ℃～110 ℃.

(4) sintering: firing temperature is selected in 1200 ℃, and soaking time is 20min, and temperature rise rate is controlled at 5 ℃/min.

(5) cooling: cool off fast under the reducing atmosphere.The functional aggregate kernel matrix for preparing is carried out SEM test can be got: the kernel air vent aperture is multistage distribution, and is main with the micron order aperture;

The functional aggregate particle for preparing peeled off carry out the ore deposit phase composite respectively and analyze; Its kernel matrix can get with outside basic surface active layer XRD test result: the kernel matrix of this functional aggregate is formed the ore deposit and is mainly mullite mutually; Trichroite and alpha-quartz can get in conjunction with the XRD test result calculations: the concrete mineral composition of kernel matrix is: mullite 63.54%, trichroite 13.91%; Alpha-quartz 20.16%, surplus are other; The composition ore deposit of outside basic surface active layer is mainly Dicalcium Phosphate (Feed Grade), tricalcium silicate, tricalcium aluminate, celite mutually.Can get in conjunction with the XRD test result, the concrete ore deposit phase composite of basic surface active layer is: Dicalcium Phosphate (Feed Grade) 15.84%, and tricalcium silicate 53.63%, tricalcium aluminate 7.56%, celite are 14.36%, surplus is other.Prepared functional aggregate is carried out matrix and shell microhardness linear time base sweep analysis, and recording the surface active layer thickness is 2.97mm.

The grain compressive strength of this functional aggregate kernel matrix bead and the concrete performance of functional aggregate are seen table 14.

Embodiment 13

(1) batching: carry out corresponding batching according to table 12, table 13 and table 14, the chemical constitution and the loss on ignition LOI that prepare the matrix raw material that obtain thus see table 15.

(2) grinding: the matrix raw material that prepare were put into the ball mill grinding 4 hours, and the control raw material granularity adds water and mixes at 325 orders, and is with the plastics film sealing, old; With ball mill grinding 4 hours, control size is at 325 orders, and was subsequent use with surfactivity layer raw material.

(3) moulding:, process bead with the matrix adopting manual assembly after old (also can adopt extrusion molding).Again surfactivity layer powder as far as possible evenly is wrapped in matrix bead surface (can use the rotoforming mode), post forming.With the samples dried after the post forming to constant weight.

(4) sintering: firing temperature is selected in 1200 ℃, and soaking time is 20min.

(5) cooling: cooling system is cooling fast under the reducing atmosphere.Described reducing atmosphere is water and coal dust evenly to be sprayed onto on the also uncooled functional aggregate by mass ratio at 1.5: 1 make.

The functional aggregate kernel matrix for preparing is carried out SEM test can be got: the kernel air vent aperture is multistage distribution, and is main with the micron order aperture;

The functional aggregate particle for preparing peeled off carry out the ore deposit phase composite respectively and analyze; Its kernel matrix can get with outside basic surface active layer XRD test result: the kernel matrix of this functional aggregate is formed the ore deposit and is mainly mullite mutually; Trichroite and alpha-quartz can get in conjunction with the XRD test result calculations: the concrete mineral composition of kernel matrix is: mullite 62.68%, trichroite 12.17%; Alpha-quartz 24.61%, surplus are other; The composition ore deposit of outside basic surface active layer is mainly Dicalcium Phosphate (Feed Grade), tricalcium silicate, tricalcium aluminate, celite mutually.Can get in conjunction with the XRD test result, the concrete ore deposit phase composite of basic surface active layer is: Dicalcium Phosphate (Feed Grade) 20.57%, and tricalcium silicate 44.92%, tricalcium aluminate 9.17%, celite are 15.39%, surplus is other.Prepared functional aggregate is carried out matrix and shell microhardness linear time base sweep analysis, and recording the surface active layer thickness is 3.54mm.

The grain compressive strength of this functional aggregate kernel matrix bead and the concrete performance of functional aggregate are seen table 14.

Embodiment 14-17

The preparation method of reference implementation example 11 carries out corresponding batching according to table 12, table 13 and table 14, and the chemical constitution and the loss on ignition LOI that prepare the matrix raw material that obtain thus see that all the other preparation conditions of table 15 are identical with embodiment 11.Concrete performance is seen table 14.

Embodiment 18-19

The preparation method of reference implementation example 11 carries out the setting of corresponding firing temperature according to table 16, and all the other are identical with embodiment 11.Concrete performance is seen table 16.

Embodiment 20-21

The preparation method of reference implementation example 11 sets the insulation firing time according to table 17, and all the other are identical with embodiment 11.Concrete performance is seen table 17.

Embodiment 22-24

The preparation method of reference implementation example 11, according to the ball milling time of table 8 setting matrix raw material and surface active layer, all the other are identical with embodiment 11.

Table 12 matrix raw material and surface active layer raw material are formed

The rate value of table 13 surface active layer raw material

Table 14 matrix raw material and surface active layer component change the functional aggregate Effect on Performance

Chemical constitution/the wt.% of table 15 matrix raw material

Table 16 firing temperature is to the functional aggregate Effect on Performance

Table 17 insulation firing time is to the functional aggregate Effect on Performance

The grinding time (granularity) of table 18 matrix raw material and surface active layer is to the functional aggregate Effect on Performance

Annotate: the test of apparent density, porosity, 1h water-intake rate and cylindrical compress strength is carried out according to " light-weight aggregate and TP thereof " GBT17431.1-2010 among table 14, the 16-18; With " highway engineering pitch and the asphalt testing regulation JTJ 052-2000 " standard test of plain asphalt adhesivity basis.

The functional aggregate of embodiment 14-24 preparation also can be applied to the intensive bituminous concrete of joining of the present invention with reference to the foregoing description and prepare, and does not enumerate one by one at this.

In addition, each concrete raw material that the present invention is cited, and the bound of each raw material, interval value, and the bound of processing parameter (like temperature, time etc.), interval value can both realize the present invention, enumerates embodiment no longer one by one at this.

Claims (10)

1. dense-graded asphalt concrete with lasting antiskid decrease of noise functions, it is formulated to be selected materials according to the dense-graded asphalt concrete ratio requirement by coarse aggregate, fine aggregate, filler and pitch, it is characterized in that: described coarse aggregate by common coarse aggregate and functional aggregate by volume per-cent count: common coarse aggregate 0～50%; Functional aggregate 50～100% is formed; Wherein, described functional aggregate is a nucleocapsid structure, is made up of porous kernel matrix and basic surface activation shell; Described porous kernel matrix is that main mine forms external phase mutually with the mullite; Be distributed with pore in the external phase, described air vent aperture is multistage distribution, and is main with the micron order aperture; The ore deposit phase composite of described basic surface activation shell is mainly Dicalcium Phosphate (Feed Grade), tricalcium silicate, tricalcium aluminate, celite.

2. the dense-graded asphalt concrete with lasting antiskid decrease of noise functions according to claim 1 is characterized in that: said dense-graded asphalt concrete is according to AC-10, and AC-13 or AC-16 dense-graded asphalt concrete carry out proportioning.

3. the dense-graded asphalt concrete with lasting antiskid decrease of noise functions according to claim 1 and 2; It is characterized in that: the ore deposit phase composite of porous kernel matrix is mainly mullite, trichroite and alpha-quartz in the said functional aggregate; Its shared mass percent is respectively: mullite 55%～70%; Trichroite 10%～15%, alpha-quartz 15%～35%, surplus is other; The ore deposit phase composite of said basic surface activation shell is mainly Dicalcium Phosphate (Feed Grade), tricalcium silicate, tricalcium aluminate, celite; Its shared mass percent is respectively: Dicalcium Phosphate (Feed Grade) 15%～23%; Tricalcium silicate 42%～55%; Tricalcium aluminate 6%～15%, celite are 8%～18%, and surplus is other.

4. the dense-graded asphalt concrete with lasting antiskid decrease of noise functions according to claim 1 and 2; It is characterized in that: said functional aggregate is a spherical particle; Particle diameter is 5-20mm, and wherein the diameter of porous kernel matrix is 4～15mm, and the thickness of outside basic surface activation shell is 1～5mm.

5. the dense-graded asphalt concrete with lasting antiskid decrease of noise functions according to claim 1 and 2 is characterized in that: described common coarse aggregate is one or more the mixing in ls, diabase, the Irish touchstone.

6. the dense-graded asphalt concrete with lasting antiskid decrease of noise functions according to claim 1 and 2 is characterized in that: described fine aggregate is one or more the mixing in river sand, machine-processed sand or the aggregate chips.

7. the dense-graded asphalt concrete with lasting antiskid decrease of noise functions according to claim 1 and 2 is characterized in that: described filler is one or more the mixing in breeze, lime or the cement.

8. the dense-graded asphalt concrete with lasting antiskid decrease of noise functions according to claim 1 and 2 is characterized in that: described pitch is A70 heavy traffic paving asphalt or A90 heavy traffic paving asphalt or SBS I-D type modifying asphalt.

9. the dense-graded asphalt concrete with lasting antiskid decrease of noise functions according to claim 1 and 2 is characterized in that: the level proportioning of described dense-graded asphalt concrete is the nominal mix proportion P that obtains according to the dense-graded asphalt concrete standard _ViConvert quality mixture ratio P into according to following conversion formula (1) _MiCarry out proportioning:

$P_{\mathrm{Mi}}=\frac{P_{\mathrm{Vi}}\×{\mathrm{\γ}}_i}{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{P}_{\mathrm{Vi}}\×{\mathrm{\γ}}_i}$ Formula (1)

In the formula: P _MiQuality mixture ratio/the % of-certain mineral aggregate composition;

P _ViNominal mix proportion/the % of-certain mineral aggregate composition;

γ _iThe corresponding gross volume specific density of-certain mineral aggregate.

10. the dense-graded asphalt concrete with lasting antiskid decrease of noise functions according to claim 1 and 2 is characterized in that: the preparation method of said functional aggregate is: with matrix raw material ball milling, add water, mix, seal old, pelletizing forming; Then basic surface active layer powder is evenly wrapped up in outside the matrix of pelletizing forming, post forming obtains wrapping up the sample of surface active layer, be dried to constant weight then after, 1150 ℃～1250 ℃ insulations are burnt till cooling fast again and are got;

Described matrix raw material are by weight by 20-40 part flyash, 20-40 part kaolin, 10-16 part shale, 8-12 part talcum powder and 6-16 part silica powder, make its mixture by the mass percentage content of each component of oxide compound be through calculation control: SiO ₂55%～65%, Al ₂O ₃18%～25%, Fe ₂O ₃+ FeO is less than 10%, and CaO+MgO is 4%～6%, K ₂O+Na ₂O is 1.5%～4.0%, and loss on ignition is 2%～6% to get;

Described basic surface active layer powder is a Portland clinker, and the rate value is KH=0.8～0.96, SM=1.9～2.4, IM=1.1～1.6.

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