CN102795813B - 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 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, the easy feature 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 thus the security of Vehicle Driving Cycle.For this problem, at present the main basalt aggregate that adopts hard wear resistant replaces limestone or the grouan preparation bituminous concrete that gathers materials, but the same smooth problem in polishing rear surface of gathering materials that exists of basalt aggregate, the region that basalt distributes is simultaneously stronger, and material cost is higher.Adopt Open grade friction course (OGFC) although the effect of certain anti-skidding, sound absorption, noise reduction has been played on road surface, but OGFC road surface Lack of support, poor durability, must use full-bodied pitch, cost is higher, is unfavorable for promoting the use of simultaneously, 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 easily by foreign material shutoff, and easy to clean not, the problem that exists anti-acoustic capability not maintain lastingly.

Summary of the invention

Technical problem to be solved by this invention is along with gathering materials, to be polished and the perforate hole problem of decay by shutoff and gradually for bituminous concrete pavement Antiskid noise performance, 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 solution used in the present invention is:

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

Press such scheme, described 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, in described functional aggregate, the ore deposit phase composite of porous kernel matrix is mainly mullite, trichroite and alpha-quartz, and 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 described basic surface activation shell is mainly Dicalcium Phosphate (Feed Grade), tricalcium silicate, tricalcium aluminate, tetracalcium aluminoferrite, its shared mass percent is respectively: Dicalcium Phosphate (Feed Grade) 15%～23%, tricalcium silicate 42%～55%, tricalcium aluminate 6%～15%, tetracalcium aluminoferrite is 8%～18%, and surplus is other.

Press such scheme, described functional aggregate is 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 described functional aggregate is: by 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, is then dried to after constant weight, and 1150 ℃～1250 ℃ insulations are burnt till quick cooling again and obtain;

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: SiO by calculation control ₂55%～65%, Al ₂o ₃18%～25%, Fe ₂o ₃it is 4%～6%, K that+FeO is less than 10%, CaO+MgO ₂o+Na ₂o is 1.5%～4.0%, and loss on ignition is 2%～6% to obtain;

Described basic surface active layer powder is Portland clinker, and 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 described water is the 20-30wt% of matrix raw material; The mass ratio of described basic surface active layer powder and matrix raw material is 15%～20%.

Press such scheme, the Ball-milling Time of described matrix raw material is 2～6 hours, and after ball milling, the granularity of matrix raw material is 300～400 orders; Described basic surface active layer powder is to granularity, to be that 300-400 order obtains through grinding 2-6h.

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 be to carry out under reducing atmosphere.

Press such scheme, the mixed solution that described reducing atmosphere is is 1.2～1.5: 1 preparation by water and coal dust is in mass ratio sprayed onto and does not also start to carry out obtaining on cooling functional aggregate.

Press such scheme, described rough sets material is one or more the mixing in limestone, diabase, basalt.

Press such scheme, described fine aggregate is one or more the mixing in river sand, Machine-made Sand or aggregate chips.

Press such scheme, described filler is one or more the mixing in breeze, lime or 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 by the nominal mix proportion P obtaining according to dense-graded asphalt concrete standard _viaccording to following conversion formula (1), be converted to quality mixture ratio P _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 formula: P _miquality mixture ratio/the % of-certain mineral aggregate composition;

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

γ _ithe corresponding bulk specific gravity of-certain mineral aggregate.

The inner porous of functional aggregate of using in dense-graded asphalt concrete of the present invention, has higher sound absorbing coefficient and lower Young's modulus, can play the effect of noise-and-vibration-reduction.The surface active layer that this functional aggregate surface has is in addition alkalescence, can increase the adhesive power of this functional aggregate and pitch.The present invention is by the dense-graded asphalt concrete of this functional aggregate preparation of adulterating in coarse aggregate, compare with rough sets material such as only using basalt or limestone, it is in use under the repeated action of wheel, can expose gradually micro-pore, remain the surface with a large amount of rough grains, and can as the bituminous concrete of the coarse aggregate preparations such as basalt or limestone, not be polished, make thus the dense-graded asphalt concrete making there is higher sound absorbing coefficient and good noise reduction, also there is 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.

Accompanying drawing explanation

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

The raw material using in following embodiment is as follows:

(1) functional aggregate: embodiment 11-13 is shown 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 meets < < standard specification for construction and acceptance of highway asphalt pavement (JTG F40-2004) > >.

Table 1 pitch the key technical indexes

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

(3) rough sets material: limestone or diabase or basalt, quality meets < < standard specification for construction and acceptance of highway asphalt pavement (JTGF40-2004) > >.

Table 2 rough sets material technical indicator

(4) fine aggregate: river sand or Machine-made Sand or aggregate chips, quality meets < < standard specification for construction and acceptance of highway asphalt pavement (JTGF40-2004) > >.

Table 3 fine aggregate technical indicator

(5) filler: breeze or lime or cement, quality meets < < standard specification for construction and acceptance of highway asphalt pavement (JTGF40-2004) > >.

Table 4 packing technique index

Embodiment 1

(1) screening of mineral aggregate: > > sieves various mineral aggregates by < < standard specification for construction and acceptance of highway asphalt pavement (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-made Sand and aggregate chips, and filler is breeze.

(2) mensuration of mineral aggregate density: apparent relative density and the bulk specific gravity of measuring various mineral aggregates by < < standard specification for construction and acceptance of highway asphalt pavement (JTG F40-2004) > >.

(3) by < < standard specification for construction and acceptance of highway asphalt pavement (JTG F40-2004) > >, carry out aggregate grading design, and the grating obtaining is thus compared to the nominal mix proportion of various mineral aggregates, then according to following formula, by the nominal mix proportion (P of each mineral aggregate _vi) be converted to quality mixture ratio (P _mi).

$P_{\mathrm{mi}}=\frac{P_{\mathrm{Vi}}\&times;{\mathrm{\&gamma;}}_i}{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{P}_{\mathrm{Vi}}\&times;{\mathrm{\&gamma;}}_i}$ Formula (2)

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

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

γ _ithe corresponding bulk specific gravity of-certain mineral aggregate.

(4) in conjunction with dense-graded asphalt concrete model AC-13, according to engineering experience, estimating bitumen aggregate ratio is 6.0%, then in ± 1% scope, evenly choose 5 points, 5.0%, 5.5%, 6.0%, 6.5%, 7.0%, then carrying out Marshall experiment and calculating best bitumen aggregate ratio OAC by < < standard specification for construction and acceptance of highway asphalt pavement (JTG F40-2004) > > is 6.2%; Under this best bitumen aggregate ratio, according to the experimental technique in standard < < highway engineering pitch and Asphalt Mixture Experiment rules JTJ 052-2000 > >, carry out respectively wheel tracking test, freeze thawing split test, the test of immersion residual stability, each test index meets code requirement, determine that thus best bitumen aggregate ratio is 6.2%, concrete freeze thawing Ratio of split strength and immersion residual stability are in Table 7.

(5) adopt mineral aggregate gradation quality proportioning as above and best oilstone beguine according to < < standard specification for construction and acceptance of highway asphalt pavement (JTGF40-2004) > > mixing, pave and roller-compaction makes 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 (in Table 7) before and after using.

Embodiment 2

The functional aggregate that adopts embodiment 12 preparations, carries out mineral aggregate gradation according to dense-graded asphalt concrete AC-10, and all the other are identical with embodiment 1, and its mineral aggregate volume level proportioning and best bitumen aggregate ratio are in Table 6.

Its freeze thawing Ratio of split strength, 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

The functional aggregate that adopts embodiment 13 preparations, carries out mineral aggregate gradation according to dense-graded asphalt concrete AC-16, and all the other are identical with embodiment 1, and its mineral aggregate volume level proportioning and best bitumen aggregate ratio are in Table 6.

Its freeze thawing Ratio of split strength, 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 SBS modifying asphalt, ^*in bracket, data are coarse aggregate nominal particle diameter scope.

Table 7 different gradation bituminous concrete performance comparison

^*pavement usage is coefficient of sliding resistance performance and initial value contrast after 5 years, ^*pavement usage is noise figure and initial value contrast after 5 years

Embodiment 4～6

Coarse aggregate is chosen by functional aggregate in table 8 and rough sets material volume proportion separately in mineral aggregate, then according to the formula in embodiment 1 (1), convert and obtain mineral aggregate quality proportioning, wherein: choosing according to table 8 of rough sets material and fine aggregate carried out, all the other are identical with embodiment 3.Its freeze thawing Ratio of split strength, 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 Ratio of table 9 Different Coarse Aggregates proportioning

^*pavement usage is coefficient of sliding resistance performance and initial value contrast after 5 years, ^*pavement usage is noise figure and initial value contrast after 5 years.

Associative list 8 and table 9 can obtain: the dense-graded asphalt concrete that when volume ratio that functional aggregate accounts for coarse aggregate is more than or equal to 50%, preparation obtains all can meet good water resistance and lasting antiskid anti-acoustic capability.

Embodiment 7～8

According to the asphalt variety in table 10, choose pitch, according to AC-16 dense-graded asphalt concrete, carry out mineral aggregate gradation, all the other are identical with embodiment 4.Its freeze thawing Ratio of split strength, immersion residual stability and durability performance (comprising cling property and anti-acoustic capability contrast before and after using) are in Table 10.

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

^*pavement usage is coefficient of sliding resistance performance and initial value contrast after 5 years, ^*pavement usage is noise figure and initial value contrast after 5 years.

Embodiment 9～10

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

The different filler bituminous concrete of table 11 performance comparison

^*pavement usage is coefficient of sliding resistance performance and initial value contrast after 5 years, ^*pavement usage is noise figure and initial value contrast after 5 years

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 of the matrix raw material that preparation obtains thus and loss on ignition LOI are in Table 15.

(2) grinding: the matrix raw material that prepare are put into ball mill grinding 4 hours, control raw material granularity at 325 orders, add the water of matrix raw material 22%, mix, with plastics film sealing, old 3h; Surface active layer raw material, with ball mill grinding 4 hours, controlled to granularity at 325 orders, standby.

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

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

(5) cooling: under reducing atmosphere, to carry out cooling fast.The mixed solution that described reducing atmosphere is is preparation in 1.2: 1 by water and coal dust is in mass ratio sprayed onto and does not also start to carry out obtaining on cooling functional aggregate.

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

The functional aggregate kernel matrix preparing is carried out to SEM test, see Fig. 2.As shown in Figure 2: kernel air vent aperture is multistage distribution, and take micron order aperture as main;

The functional aggregate particle preparing is peeled off and carried out respectively ore deposit phase composite analysis, and its kernel matrix and outside basic surface active layer XRD test result are respectively as shown in Figure 3 and Figure 4.As shown in Figure 3: the kernel matrix composition ore deposit of this functional aggregate is mainly mullite mutually, trichroite and alpha-quartz, can obtain in conjunction with XRD test result calculations: the concrete mineral composition of kernel matrix is: mullite 64.3%, trichroite 13.24%, alpha-quartz 22.13%, surplus is other.As shown in Figure 4: the composition ore deposit of the outside basic surface active layer of this functional aggregate is mainly Dicalcium Phosphate (Feed Grade), tricalcium silicate, tricalcium aluminate, tetracalcium aluminoferrite mutually.In conjunction with XRD test result, can obtain, 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%, tetracalcium aluminoferrite is 15.39%, surplus is other.

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

The grain compressive strength of this functional aggregate kernel matrix bead and the specific performance of functional aggregate are in Table 14.

Embodiment 12

(1) batching: carry out corresponding batching according to table 12, table 13 and table 14, the chemical constitution of the matrix raw material that preparation obtains thus and loss on ignition LOI are in Table 15.

(2) grinding: the matrix raw material that prepare are put into ball mill grinding 4 hours, control raw material granularity at 325 orders, add the water of matrix material 30%, mix, with plastics film sealing, old 2h; Surfactivity layer raw material, with ball mill grinding 4 hours, controlled to granularity at 325 orders, standby.

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

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

(5) cooling: under reducing atmosphere, to carry out cooling fast.The functional aggregate kernel matrix preparing is carried out to SEM test can be obtained: kernel air vent aperture is multistage distribution, and take micron order aperture as main;

The functional aggregate particle preparing is peeled off and carried out respectively ore deposit phase composite analysis, its kernel matrix can obtain with outside basic surface active layer XRD test result: the kernel matrix composition ore deposit of this functional aggregate is mainly mullite mutually, trichroite and alpha-quartz, in conjunction with XRD test result calculations, can obtain: the concrete mineral composition of kernel matrix is: mullite 63.54%, trichroite 13.91%, alpha-quartz 20.16%, surplus is other; The composition ore deposit of outside basic surface active layer is mainly Dicalcium Phosphate (Feed Grade), tricalcium silicate, tricalcium aluminate, tetracalcium aluminoferrite mutually.In conjunction with XRD test result, can obtain, 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%, tetracalcium aluminoferrite is 14.36%, surplus is other.Prepared functional aggregate is carried out to matrix and shell microhardness linear time base sweep analysis, and recording surface active layer thickness is 2.97mm.

The grain compressive strength of this functional aggregate kernel matrix bead and the specific performance of functional aggregate are in Table 14.

Embodiment 13

(1) batching: carry out corresponding batching according to table 12, table 13 and table 14, the chemical constitution of the matrix raw material that preparation obtains thus and loss on ignition LOI are in Table 15.

(2) grinding: the matrix raw material that prepare are put into ball mill grinding 4 hours, control raw material granularity at 325 orders, add water and mix, with plastics film sealing, old; Surfactivity layer raw material, with ball mill grinding 4 hours, controlled to granularity at 325 orders, standby.

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

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

(5) cooling: cooling system is cooling fast under reducing atmosphere.Described reducing atmosphere is that water and coal dust are evenly sprayed onto also and are made on uncooled functional aggregate in mass ratio at 1.5: 1.

The functional aggregate kernel matrix preparing is carried out to SEM test can be obtained: kernel air vent aperture is multistage distribution, and take micron order aperture as main;

The functional aggregate particle preparing is peeled off and carried out respectively ore deposit phase composite analysis, its kernel matrix can obtain with outside basic surface active layer XRD test result: the kernel matrix composition ore deposit of this functional aggregate is mainly mullite mutually, trichroite and alpha-quartz, in conjunction with XRD test result calculations, can obtain: the concrete mineral composition of kernel matrix is: mullite 62.68%, trichroite 12.17%, alpha-quartz 24.61%, surplus is other; The composition ore deposit of outside basic surface active layer is mainly Dicalcium Phosphate (Feed Grade), tricalcium silicate, tricalcium aluminate, tetracalcium aluminoferrite mutually.In conjunction with XRD test result, can obtain, 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%, tetracalcium aluminoferrite is 15.39%, surplus is other.Prepared functional aggregate is carried out to matrix and shell microhardness linear time base sweep analysis, and recording surface active layer thickness is 3.54mm.

The grain compressive strength of this functional aggregate kernel matrix bead and the specific performance of functional aggregate are in Table 14.

Embodiment 14-17

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

Embodiment 18-19

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

Embodiment 20-21

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

Embodiment 22-24

The preparation method of reference 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 form

The rate value of table 13 surface active layer raw material

Table 14 matrix raw material and surface active layer component change the impact on functional aggregate performance

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

The impact of table 16 firing temperature on functional aggregate performance

The impact of table 17 insulation firing time on functional aggregate performance

The impact of the grinding time of table 18 matrix raw material and surface active layer (granularity) on functional aggregate performance

Note: in table 14,16-18, the test of apparent density, porosity, 1h water-intake rate and cylindrical compress strength is carried out according to < < light-weight aggregate and test method > > GBT17431.1-2010 thereof; With plain asphalt adhesivity according to < < highway engineering pitch and Asphalt Mixture Experiment rules JTJ 052-2000 > > standard test.

Functional aggregate prepared by embodiment 14-24 also can be applied to the intensive bituminous concrete of joining of the present invention with reference to above-described embodiment to be prepared, and at this, does not enumerate.

Separately, 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 (as temperature, time etc.), interval value can realize the present invention, at this, will not enumerate embodiment.

Claims (9)

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

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

2. the dense-graded asphalt concrete with lasting antiskid decrease of noise functions according to claim 1, is characterized in that: described 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: described functional aggregate is 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.

4. the dense-graded asphalt concrete with lasting antiskid decrease of noise functions according to claim 1 and 2, is characterized in that: described rough sets material is one or more the mixing in limestone, diabase, basalt.

5. 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-made Sand or aggregate chips.

6. 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 cement.

7. 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.

8. 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 by the nominal mix proportion P obtaining according to dense-graded asphalt concrete standard _viaccording to following conversion formula (1), be converted to quality mixture ratio P _micarry out proportioning:

$P_{\mathrm{mi}}=\frac{P_{\mathrm{Vi}}\&times;{\mathrm{\&gamma;}}_i}{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{P}_{\mathrm{Vi}}\&times;{\mathrm{\&gamma;}}_i}$ Formula (1)

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

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

γ _ithe corresponding bulk specific gravity of-certain mineral aggregate.

9. 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 described functional aggregate is: by 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, is then dried to after constant weight, and 1150 ℃～1250 ℃ insulations are burnt till quick cooling again and obtain;

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: SiO by calculation control ₂55%～65%, Al ₂o ₃18%～25%, Fe ₂o ₃it is 4%～6%, K that+FeO is less than 10%, CaO+MgO ₂o+Na ₂o is 1.5%～4.0%, and loss on ignition is 2%～6% to obtain;

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

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