CN114933451B - Asphalt pavement crack dispersion type base material, design method and road structure - Google Patents

Asphalt pavement crack dispersion type base material, design method and road structure Download PDF

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CN114933451B
CN114933451B CN202210570624.1A CN202210570624A CN114933451B CN 114933451 B CN114933451 B CN 114933451B CN 202210570624 A CN202210570624 A CN 202210570624A CN 114933451 B CN114933451 B CN 114933451B
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weight percentage
interference
coarse aggregate
filler
asphalt pavement
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CN114933451A (en
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李昶
程理
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Southeast University
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/0076—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials characterised by the grain distribution
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C7/00—Coherent pavings made in situ
    • E01C7/08—Coherent pavings made in situ made of road-metal and binders
    • E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
    • E01C7/14—Concrete paving
    • E01C7/142—Mixtures or their components, e.g. aggregate
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C7/00—Coherent pavings made in situ
    • E01C7/08—Coherent pavings made in situ made of road-metal and binders
    • E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
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  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Road Paving Structures (AREA)

Abstract

The invention belongs to the technical field of traffic and transportation engineering, and particularly relates to a bituminous pavement crack dispersion type base material, a design method and a road structure, wherein the base material comprises the following components in percentage by weight: 50% -55% of main aggregate; 15% -20% of interference material; filling the blocking material by 25-30 percent; 4% -6% of cement; 5 to 6 percent of water. In the road structure, a pre-splitting technology is applied in the construction of the material structure layer, and fine reticular cracks are formed in the crack dispersion type base material to avoid the generation of long or wide cracks, so that the crack resistance of the base is enhanced. The asphalt pavement crack dispersion type base material provided by the invention can improve the crack resistance of a road base, can be adapted by an asphalt concrete surface layer, and cannot cause cracking of the asphalt layer. The invention solves the problem of cracking of semi-rigid base material asphalt pavement represented by water-stable macadam after construction.

Description

Asphalt pavement crack dispersion type base material, design method and road structure
Technical Field
The invention belongs to the technical field of traffic engineering, and particularly relates to a bituminous pavement crack dispersion type base material, a design method and a road structure.
Background
At present, the semi-rigid base course is a main road surface base course material commonly adopted by roads and urban roads in China. With the continuous promotion of the scale and level of highway construction in China, the semi-rigid base technology represented by cement stabilized macadam is continuously developed and perfected. Compared with the flexible base pavement, the semi-rigid base pavement has higher strength and bearing capacity due to the large rigidity of the semi-rigid base pavement, is favorable for local materials, fully utilizes local materials, reduces the influence on the environment, and becomes the main material of the highway base pavement in China.
The cement stabilized macadam is a mixture with certain mechanical strength and compactness, which is formed by taking macadam with certain gradation as aggregate, combining a cementing material and a certain amount of mortar volume to fill gaps of the macadam, and mixing, compacting and curing. The composite material has the advantages of good scouring resistance, water stability, frost resistance and fatigue resistance, good economy and most extensive application in semi-rigid base materials.
However, with the heavy use of cement stabilized macadam based asphalt pavements, it has been gradually found that more cracks frequently appear in the pavement at an early stage than in flexible based asphalt pavements. Cement stabilized macadam base materials are sensitive to changes in humidity and temperature, and are prone to developing drying shrinkage cracks and low temperature shrinkage cracks during the strength formation process and during operation. Under the repeated action of traffic load and external environment, the asphalt surface layer corresponding to the crack of the cement stabilized macadam base also cracks. Under the combined action of vehicle, moisture, frost and other factors, the surface layer often has aggregate or small asphalt pieces peeled off along cracks. After many semi-rigid base asphalt pavements are opened, maintenance is required at the latest two years, and overhaul is required after 3-5 years, which not only causes huge maintenance cost expenditure, but also greatly influences pavement service performance and driving safety.
Therefore, one technical difficulty in the application of the semi-rigid base layer is the problem of cracking resistance, which is a technical difficulty in gradually discovering, summarizing, researching and recognizing the maturity of the semi-rigid base layer material which is represented by the lime-lime crushed stones and the water-stable crushed stones in a long-term and large-range application process.
The discontinuous graded water-stable macadam is used as an anti-cracking water-stable macadam material, and then a plurality of fine cracks are generated by a pre-cracking technology in construction, so that the normal water-stable macadam base layer is prevented from generating reflection cracks upwards, and the cracks can be adapted by an asphalt concrete layer rich in asphalt and can not cause cracking of an asphalt layer. The method of organically combining the design and construction is not yet applied to roads.
Disclosure of Invention
The invention provides a crack dispersion type base material of an asphalt pavement, a design method and a road structure, which solve the cracking problem of the semi-rigid base material asphalt pavement represented by water-stable macadam after construction.
The technical scheme adopted by the invention for solving the technical problems is as follows: the asphalt pavement crack dispersing base material comprises the following components in percentage by weight:
50 to 55 percent of coarse aggregate
15 to 20 percent of interference material
25 to 30 percent of filling material
4 to 6 percent of cement
5% -6% of water;
wherein the interference barrier and the filler are used as fine aggregates.
Also provides a design method of the asphalt pavement crack dispersion type base material, which comprises the following steps:
step 1, selecting raw materials for preparing a base material, wherein the selection method comprises the following steps:
1-1, selecting raw materials, selecting graded broken stones from coarse aggregates, selecting melon seed pieces from interference grade materials, selecting continuous graded rice and stone powder from filling materials, and selecting portland cement from cement;
step 1-2, screening out raw materials with required particle sizes, carrying out a screening test on the raw materials selected in the step 1-1, and screening out the raw materials with the required particle sizes;
step 2, obtaining the density of the raw material: performing physical and mechanical property test to obtain the bulk density rho of the coarse aggregate c Bulk density of coarse aggregate ρ b Bulk density of fine aggregate ρ f ；
Step 3, calculating the skeleton gap rate VCA of the coarse aggregate in the tap state DRC : according to the bulk density rho of the coarse aggregate obtained in the step 2 c Bulk density of coarse aggregate ρ b Calculating and obtaining the framework gap ratio VCA of the coarse aggregate in the tap state through a formula (1) DRC The formula (1) is as follows
VCA DRC ＝(1-ρ c /ρ b )×100 (1)；
Step 4, calculating the weight percentage q of the fine aggregate f : according to the cubic density rho of the fine aggregate obtained in the step 2 f Combining the framework clearance ratio VCA of the coarse aggregate in the tap state obtained in the step 3 DRC The weight percentage q of the fine aggregate is calculated by the formula (2) f Equation (2) is as follows:
Figure BDA0003659000400000031
step 5, calculating the weight percentage q of the coarse aggregate c : according to q obtained in step 4 f The weight percentage q of the coarse aggregate is calculated by the formula (3) c The formula (3) is specifically as follows:
q c ＝100-q f (3)；
step 6, calculating the weight percentage q of the interference material g The specific calculation steps are as follows:
step 6-1, determining an interference material blocking and coarse material collecting ratio CA: determining the ratio CA = n of interference material blocking to coarse material collecting, wherein the value range of n is 0.27-0.4;
step 6-2, according to the weight percentage q of the fine aggregate obtained in the step 5 c Calculating the weight percentage q of the interference material by a formula (4) g Equation (4) is specifically as follows:
Figure BDA0003659000400000032
step 7, calculating the weight percentage q of the filling material t : according to the weight percentage q of the fine aggregate obtained in the step 5 c And the weight percentage q of the interference material obtained in the step 6-2 g Calculating the weight percentage q of the filler by the formula (5) t Equation (5) is specifically as follows:
q g +q c +q t ＝1 (5)；
step 8, determining the weight percentage q of the obtained interference material g The weight percentage q of the obtained filling material t Whether or not within the corresponding value range:
determining the weight percentage q of the interference material obtained in the step 6-2 g Whether or not the weight percentage q of the interference material is in g The weight percentage value range of (A);
determining the weight percentage q of the filler obtained in step 7 t Whether or not in the weight percentage q of the filler t The weight percentage value range of (A);
step 9, determining the weight percentage of interference material blocking and filling materials of the asphalt pavement crack dispersion type base layer material according to the result determined in the step 8;
the determination result of step 8 includes the following conditions:
working condition I, weight percentage q of obtained interference material g The weight percentage q of the obtained filling material is within the value range of the weight percentage of the interference material t Within the range of the weight percentage of the filler;
working condition II, weight percentage q of obtained interference material g Out of the range of the interference material weight percent or/and the weight percent q of the obtained filler t Is not in the range of the weight percentage of the filler;
when the working condition is determined to be one in the step 8, the weight percentage q of the interference material obtained in the step 6-2 is g And the weight percentage q of the filler obtained in the step 7 t Preparing the weight percentages of coarse aggregate, interference material blocking and filling materials of the asphalt pavement crack dispersion type base course material;
when the working condition II is determined in the step 8, the value of the ratio CA of interference blocking to coarse material collection is re-taken, and the weight percentage q of the interference blocking is re-calculated according to the steps 6 to 8 g And the weight percentage q of the filler t Until the weight percentage q of the interference material is recalculated g And the weight percentage q of the filler t If the first working condition is met, the weight percentage q of the interference material is recalculated g And the weight percentage q of the filler t Preparing the weight percentage of interference material blocking and filling materials of the asphalt pavement crack dispersion type base material;
step 10, preparing a bituminous pavement crack dispersed base material: according to the weight percentage q of the fine aggregate obtained in the step 5 c And step 9, determining the weight percentage of interference material blocking and filling materials of the asphalt pavement crack dispersion type base material, and mixing the interference material blocking and filling materials with water and cement to prepare the asphalt pavement crack dispersion type base material.
As a further preferred aspect of the present invention, the particle size range of the starting material of the desired particle size in step 1-2 is as follows:
the grain size range of the coarse aggregate is 26.5mm-31.5mm;
the grain size range of the interference material is 4.75mm-9.5mm;
the filler has a particle size in the range of 0-4.75mm.
As a further preference of the present invention, before step 6, the weight percentage q of the coarse aggregate obtained in step 5 is determined c Whether the weight percentage of the coarse aggregate is within the value range;
when determining the weight percentage q of the coarse aggregate obtained in the step 5 c If the weight percentage of the coarse aggregate is within the value range, performing step 6;
when determining the weight percentage q of the coarse aggregate obtained in the step 5 c If the weight percentage of the coarse aggregate is not in the value range, repeating the steps 1-2 to 5, and recalculating the weight percentage q of the coarse aggregate c Until the weight percentage q of the coarse aggregate is recalculated c And (6) performing step 6 within the value range of the weight percentage of the coarse aggregate.
As a further preferred method of the present invention, in step 9, the method of re-taking the value of the interference stock stop-to-coarse stock ratio CA is as follows:
when the step 8 is determined as the second working condition, the weight percentage q of the interference material obtained in the step 6-2 is the same g Exceeding the weight percentage range of the interference material blocking, and the weight percentage q of the filler obtained in the step 7 t And (3) if the weight percentage of the filler is exceeded, adopting a formula (6) to re-obtain the value of the ratio CA of interference material blocking to coarse material collecting, wherein the formula (6) is as follows:
CA＝n-0.05i (6)
in the formula (6), i is the number of times of re-taking the value of the interference stock stop-to-coarse stock ratio CA;
when the step 8 is determined as the second working condition, the weight percentage q of the interference material obtained in the step 6-2 is the same g Lower than the weight percentage range of interference material blocking, and the weight percentage q of the filler obtained in the step 7 t And (3) when the weight percentage of the filler is lower than the range of the weight percentage of the filler, adopting a formula (7) to re-obtain the value of the ratio CA of interference material blocking to coarse material collecting, wherein the formula (7) is as follows:
CA＝n+0.05i (7)；
in the formula (7), i is the number of times of re-taking the value of the interference stock stop-to-coarse stock ratio CA;
when the step 8 is determined as the second working condition, the weight percentage q of the interference material obtained in the step 6-2 is the same g Exceeding the weight percentage range of interference material blocking, and the weight percentage q of the filler obtained in the step 7 t Lower than the weight percentage range of the filler, or the weight percentage q of the interference material obtained in the step 6-2 g Lower than the weight percentage range of interference material blocking, and the weight percentage q of the filler obtained in the step 7 t And (3) if the weight percentage of the filler is exceeded, adopting a formula (6) or a formula (7) to re-obtain the value of the ratio CA of the interference material blocking to the coarse aggregate.
Also provided is a road structure of the asphalt pavement crack dispersion type base layer material, the road structure comprises a high-traffic road structure with the daily traffic of more than 5000 and a low-traffic road structure with the daily traffic of less than 5000, wherein:
the high traffic volume road structure comprises an asphalt concrete upper surface layer, an asphalt concrete lower surface layer, an asphalt pavement crack dispersion type material base layer, a cement stabilization type base layer and an aggregate type base layer which are paved from top to bottom;
the low traffic volume road structure comprises an asphalt concrete surface layer, an asphalt pavement crack dispersion type material base layer and a cement stabilization type base layer;
the asphalt pavement crack dispersion type material base layer in the high-traffic-volume road structure and the asphalt pavement crack dispersion type material base layer in the low-traffic-volume road structure have the same components;
the asphalt pavement crack dispersion type material base layer comprises the following components in parts by mass: 50-55% of coarse aggregate, 15-20% of interference blocking material, 25-30% of filling material, 4-6% of cement and 5-6% of water.
As a further optimization of the invention, the gradation of the upper surface layer of the asphalt concrete in the high traffic volume road structure is SUP-13 type gradation, and the thickness is 3-5cm;
the gradation of the lower surface layer of the asphalt concrete is SUP-25 type gradation, and the thickness is 7-9cm;
the thickness of the base layer of the asphalt pavement crack dispersion material is 15-20cm;
the cement stable subbase layer is a common water stable subbase layer with the thickness of 15-20cm;
the granule subbase is a two-ash soil subbase with a thickness of 20-25cm.
As a further optimization of the invention, the gradation of the asphalt concrete surface layer in the low traffic volume road structure is SUP-20 type gradation, and the thickness is 2-4cm;
the thickness of the base layer of the asphalt pavement crack dispersion type material is 15-20cm;
the cement stable subbase layer is a common water stable subbase layer with the thickness of 15-20cm.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the asphalt pavement crack dispersion type base material has the advantages that the plate body is weakened due to the large amount of coarse aggregate particles, and due to the discontinuous gradation of the base material, conditions are provided for the stable cracking between the coarse particles and the fine particles, so that the base material can obtain a material structure state similar to graded broken stones, the fine stress relaxation effect of the material can effectively release micro deformation and relaxation stress, and the wide and long shrinkage cracks are avoided. The material is in a state of cracking but not breaking after construction and molding, and a plurality of dense cracks can be generated inside the material, so that when the material is subjected to shrinkage cracking such as warm shrinkage, dry shrinkage and the like, the shrinkage deformation of the material is dissipated to the fine cracks at each position, the few and wide cracks are avoided, the generation of reflection cracks is avoided, and the problem of asphalt layer cracking is solved.
2. The asphalt pavement crack dispersion type base material has excellent pavement performance, and has higher rigidity and deformation resistance compared with common graded broken stones due to the fact that the coarse aggregate provides a framework. The dispersed base material is more similar to flexible base materials such as graded broken stones and the like in stress characteristic due to the fact that the discontinuous grading and the fine aggregate weight ratio are large, tiny cracks generated in the material due to cement hydration can be adapted to an asphalt concrete layer rich in asphalt, and cracking of the asphalt layer cannot be caused.
3. The invention provides a structure and a construction method corresponding to a crack dispersion type base material of an asphalt pavement, wherein a micro-crack technology is applied in the curing process of the crack dispersion type base material, a vibratory roller is used for performing vibratory rolling on the crack dispersion type base material, and fine reticular cracks are formed in the crack dispersion type base material by matching with the flexible property of the crack dispersion type material, so that the early shrinkage stress of the material can be effectively released, the asphalt concrete surface layer is subjected to smaller shrinkage strain, and the asphalt pavement crack dispersion type base material can be better adapted to the asphalt pavement crack dispersion type base material due to the ductility of the asphalt concrete surface layer without forming reflection cracks.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a high traffic volume asphalt pavement crack dispersion type road structure of the present invention;
FIG. 2 is a low traffic volume asphalt pavement crack dispersion type road structure of the present invention;
fig. 3 is a schematic cross-sectional view of the spacial skeleton formed from the coarse aggregate according to the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part", etc. indicate orientations or positional relationships based on those shown in the drawings, only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, "first", "second", etc. do not represent an important degree of the component, and thus, are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
Example 1
As shown in fig. 1 to 3, this example provides a preferred embodiment, an asphalt pavement crack-dispersed base material, which comprises the following components by weight percent:
50 to 55 percent of coarse aggregate
15 to 20 percent of interference grade material
25 to 30 percent of filling material
4 to 6 percent of cement
5% -6% of water;
wherein the interference baffle and the filler are used as fine aggregates.
The embodiment also provides a design method of the asphalt pavement crack dispersion type base material, which comprises the following steps:
step 1, selecting raw materials for preparing a base material, wherein the selection method comprises the following steps:
1-1, selecting raw materials, selecting graded broken stones from coarse aggregates, selecting melon seed pieces from interference grade materials, selecting continuous graded rice seeds and stone powder from filling materials, and selecting portland cement from cement; preferably, the cement is portland cement designated by reference numeral 42.5.
Step 1-2, screening out raw materials with required particle sizes, performing a screening test on the raw materials selected in the step 1-1, and screening out the raw materials with the required particle sizes;
the particle size range of the raw material with the required particle size in the step 1-2 is as follows:
the grain size range of the coarse aggregate is 26.5mm-31.5mm; the graded broken stone adopts G7 specification in the specification requirement of the highway pavement surface course base layer construction technology (JTG/T F20-2015) table 3.6.2 coarse aggregate specification, the interference material melon seed pieces adopt G10 specification in the specification requirement of the highway pavement surface course base layer construction technology (JTG/T F20-2015) table 3.6.2 coarse aggregate specification, and the filler rice and stone powder adopt XG3 specification in the specification requirement of the highway pavement surface course base layer construction technology (JTG/T F20-2015) table 3.7.3 fine aggregate specification.
The grain size range of the interference material is 4.75mm-9.5mm;
the filler has a particle size of 0-4.75mm
The grain size of the coarse aggregate ranges from 26.5mm to 31.5mm.
That is, the particle size of the coarse aggregate selected by the embodiment is larger than that of the existing coarse aggregate, so that the large-particle-size particles have high strength and large volume and can form a skeleton structure. The filler particles can be filled into the gaps of the skeleton structure formed by the coarse aggregates, can play a supporting role, but do not influence the formation of the skeleton structure of the coarse aggregates. The interference material coarse aggregate skeleton structure has certain influence, but the reasonable practicability can improve the whole construction workability of the base material.
Step 2, obtaining the density of the raw material: performing physical and mechanical property test to obtain the bulk density rho of the coarse aggregate c Bulk density of coarse aggregate ρ b Bulk density of fine aggregate ρ f ；
Step 3, calculating the skeleton clearance ratio VCA of the coarse aggregate in the tap state DRC : according to the bulk density rho of the coarse aggregate obtained in the step 2 c Bulk density of coarse aggregate ρ b Calculating and obtaining the framework clearance ratio VCA of the coarse aggregate in the tap state through a formula (1) DRC Equation (1) is as follows:
VCA DRC ＝(1-ρ c /ρ b )×100 (1)；
step 4, calculating the weight percentage q of the fine aggregate f : according to the bulk density rho of the fine aggregate obtained in the step 2 f Combining the framework clearance ratio VCA of the coarse aggregate in the tap state obtained in the step 3 DRC The weight percentage q of the fine aggregate is calculated by the formula (2) f Equation (2) is as follows:
Figure BDA0003659000400000091
step 5, calculating the weight percentage q of the coarse aggregate c : according to q obtained in step 4 f The weight percentage q of the coarse aggregate is calculated by the formula (3) c The formula (3) is specifically as follows:
q c ＝100-q f (3)。
further, before step 6, the weight percentage q of the coarse aggregate obtained in step 5 is determined c Whether the weight percentage of the coarse aggregate is within the value range is determined by the following specific determination method:
when the step is determinedWeight percentage q of coarse aggregate obtained in step 5 c If the weight percentage of the coarse aggregate is within the value range, performing step 6;
when determining the weight percentage q of the coarse aggregate obtained in the step 5 c If not, repeating the steps 1-2 to 5, and recalculating the weight percentage q of the coarse aggregate c Until the weight percentage q of the coarse aggregate is recalculated c And 6, performing step 6 within the value range of the weight percentage of the coarse aggregate.
Step 6, calculating the weight percentage q of the interference material g The specific calculation steps are as follows:
step 6-1, determining an interference material blocking and rough material collecting ratio CA: determining the ratio CA = n of interference blocking to coarse material collection, wherein the value range of n is 0.27-0.4;
preferably, CA = n, n is 0.3, when CA = n =0.3, the coarse aggregate composition structure is stable, the workability of each component of the material is optimal during blending, the construction effect is best, and the crack resistance of the material can be ensured to be optimal.
Step 6-2, according to the weight percentage q of the fine aggregate obtained in the step 5 c Calculating the weight percentage q of the interference material by a formula (4) g Equation (4) is specifically as follows:
Figure BDA0003659000400000101
step 7, calculating the weight percentage q of the filling material t : according to the weight percentage q of the fine aggregate obtained in the step 5 c And the weight percentage q of the interference material obtained in the step 6-2 g Calculating the weight percentage q of the filler by the formula (5) t Equation (5) is specifically as follows:
q g +q c +q t ＝1 (5)；
step 8, determining the weight percentage q of the obtained interference material g The weight percentage q of the obtained filler t Whether or not within the corresponding value range:
determiningThe weight percentage q of the interference material obtained in the step 6-2 g Whether or not in the weight percentage q of the interference material g The weight percentage value range of (a);
determining the weight percentage q of the filler obtained in step 7 t Whether or not in the weight percentage q of the filler t The weight percentage of (A) is within the range.
Step 9, determining the weight percentage of interference material blocking and filling materials of the asphalt pavement crack dispersion type base layer material according to the result determined in the step 8;
the determination result of step 8 includes the following conditions:
working condition I, weight percentage q of obtained interference material g Within the value range of the weight percent of the interference material, the weight percent q of the obtained filling material t In the range of the weight percentage of the filler;
working condition II, weight percentage q of obtained interference material g Out of the range of the interference material weight percent or/and the weight percent q of the obtained filler t Is not in the range of the weight percentage of the filler.
When the working condition is determined to be one in the step 8, the weight percentage q of the interference material obtained in the step 6-2 is g And the weight percentage q of the filler obtained in the step 7 t Preparing the weight percentages of coarse aggregate, interference material blocking and filling materials of the asphalt pavement crack dispersion type base material;
when the working condition II is determined in the step 8, the value of the ratio CA of interference blocking to coarse material collection is re-taken, and the weight percentage q of the interference blocking is re-calculated according to the steps 6 to 8 g And the weight percentage q of the filler t Until the weight percentage q of the interference material is calculated again g And the weight percentage q of the filler t If the first working condition is met, the weight percentage q of the interference material is recalculated g And the weight percentage q of the filler t The weight percentage of the interference material and the filling material for preparing the asphalt pavement crack dispersion type base material is disclosed.
Further, in step 9, the method for re-taking the value of the interference stock stop-to-coarse stock ratio CA is as follows:
when the step 8 is determined as the second working condition, the weight percentage q of the interference material obtained in the step 6-2 is the same g Exceeding the weight percentage range of the interference material blocking, and the weight percentage q of the filler obtained in the step 7 t And (3) if the weight percentage of the filler is exceeded, adopting a formula (6) to re-obtain the value of the ratio CA of interference material blocking to coarse material collecting, wherein the formula (6) is as follows:
CA＝n-0.05i (6)
in the formula (6), i is the number of times of re-taking the value of the interference stock stop-to-coarse stock ratio CA;
when the step 8 is determined as the second working condition, the weight percentage q of the interference material obtained in the step 6-2 is the same g Is lower than the weight percentage range of the interference material stopping, and the weight percentage q of the filler obtained in the step 7 t And (3) when the weight percentage of the filler is lower than the range of the weight percentage of the filler, adopting a formula (7) to re-obtain the value of the ratio CA of interference material blocking to coarse material collecting, wherein the formula (7) is as follows:
CA＝n+0.05i (7)；
in the formula (7), i is the number of times of re-taking the value of the interference stock stop-to-coarse stock ratio CA;
when the step 8 is determined as the second working condition, the weight percentage q of the interference material obtained in the step 6-2 is the same g Exceeding the weight percentage range of interference material blocking, and the weight percentage q of the filler obtained in the step 7 t Less than the weight percent range of the filler, or the weight percent q of the interference material obtained in step 6-2 g Is lower than the weight percentage range of the interference material stopping, and the weight percentage q of the filler obtained in the step 7 t And (3) when the weight percentage range of the filler is exceeded, adopting a formula (6) or a formula (7) to re-obtain the value of the ratio CA of interference blocking to rough material collection, namely selecting any one of the formula (6) and the formula (7) to re-obtain the ratio CA of interference blocking to rough material collection.
Step 10, preparing a bituminous pavement crack dispersed base material: according to the weight percentage q of the fine aggregate obtained in the step 5 c And determining the interference of the asphalt pavement crack dispersion type base material in the step 9The weight percentages of the material blocking and the filling material are mixed with water and cement to prepare the asphalt pavement crack dispersion type base material.
The present embodiment also provides a road structure of a crack-dispersed base material for asphalt pavement, the road structure including a high traffic volume road structure having a daily traffic volume of 5000 or more and a low traffic volume road structure having a daily traffic volume of 5000 or less, wherein:
the high traffic volume road structure comprises an asphalt concrete upper surface layer, an asphalt concrete lower surface layer, an asphalt pavement crack dispersion type material base layer, a cement stabilization type base layer and an aggregate type base layer which are paved from top to bottom;
the low traffic volume road structure comprises an asphalt concrete surface layer, an asphalt pavement crack dispersion type material base layer and a cement stabilization type base layer;
the asphalt pavement crack dispersion type material base layer in the high traffic volume road structure has the same components as the asphalt pavement crack dispersion type material base layer in the low traffic volume road structure;
the asphalt pavement crack dispersion type material base layer comprises the following components in parts by mass: 50-55% of coarse aggregate, 15-20% of interference blocking material, 25-30% of filling material, 4-6% of cement and 5-6% of water.
The gradation of the upper surface layer of the asphalt concrete in the high traffic volume road structure is SUP-13 type gradation, the thickness is 3-5cm, and the preferred thickness is 4cm; the gradation of the lower surface layer of the asphalt concrete is SUP-25 type gradation, the thickness is 7-9cm, and the preferential thickness is 8cm; the thickness of the base layer of the asphalt pavement crack dispersion material is 15-20cm, preferably 16cm; the cement stable subbase layer is a common water stable subbase layer, and the thickness is 15-20cm, preferably 16cm; the granule base layer is a two-ash soil base layer, and has a thickness of 20-25cm, preferably 20cm.
The gradation of the asphalt concrete surface layer in the low traffic volume road structure is SUP-20 type gradation, the thickness is 2-4cm, and the preferable thickness is 3cm; the thickness of the base layer of the asphalt pavement crack dispersion material is 15-20cm, preferably 15cm; the cement-stable subbase layer is a common water-stable subbase layer, and has a thickness of 15-20cm, preferably 20cm.
The specific construction method of the high traffic volume road structure is as follows:
firstly, a cement-stabilized base layer and an aggregate-type base layer are laid according to the requirements given by construction specifications. Paving a crack dispersion type base material layer, wherein the crack dispersion type base material is different from a common cement stabilized macadam material due to the reason that the gap grading of the crack dispersion type base material and the mass of main aggregate account for a large amount, and in order to prevent the crack dispersion type base material from generating segregation, the material is unloaded to a paving machine to be operated at a constant speed as much as possible, and a transverse material distribution device and a spiral material distributor also need to operate slowly; compacting the material after the paving is finished, wherein the road roller needs to adopt high-frequency low-floating vibration compaction or low-frequency high-frequency vibration compaction; after paving and rolling a dispersed base material base layer and maintaining the base layer for a short time, the vibratory roller is used for vibrating and rolling the base layer for multiple times, so that fine net-shaped cracks can be formed on the surface and in the base layer to avoid the generation of long or wide cracks, and the anti-cracking performance of the base layer is enhanced to a certain degree. After the presplitting vibration is finished, the geotextile is covered and cured for 7 days. And finally paving an asphalt surface layer according to the standard requirement.
Preferably, after 5-6 hours of maintaining the base layer of the crack dispersion type base material, a Beckman beam deflectometer is used for measuring the rebound deflection value of the road surface, the base layer is subjected to high-frequency low-amplitude rolling of the vibratory roller, the rebound deflection value is measured after each rolling is finished, when the rebound deflection value is reduced to 70% of that in the initial measurement, the rolling of the vibratory roller is stopped, and the application of the pre-cracking and micro-cracking technology is finished.
Preferably, when the separation phenomenon occurs or the unevenness of the coarse and fine aggregates in the transverse distribution occurs during the laying of the crack dispersion type base material, the water content needs to be reduced by 1-2% in order to ensure the workability of the construction.
The design principle of the invention is as follows: for the cement stabilized macadam material with the discontinuous grading framework embedded and extruded structure, such as asphalt dispersing type materials, the influence of cement hydration on the connection effect of fine aggregates is larger than the influence on the bonding effect of coarse aggregates, so that cracks are inevitably generated on the interface of coarse aggregate macadam particles and fine aggregate cement cementing materials when the cement generates temperature shrinkage and drying shrinkage deformation.
When the fine aggregate is filled into the gap formed by the coarse aggregate, the gap has the characteristic of being relatively closed because the coarse aggregate is closely contacted, and only part of the fine aggregate can be filled in. In the process of mixing and compacting, a part of gaps are enveloped by the coarse aggregate and are not enough for fine materials to enter, and the part of gaps which are not fully filled after the materials are molded form gaps of the anti-cracking water-stabilizing materials, and the gaps are the places where cracks are generated on the interfaces of the coarse aggregate broken stone particles and the fine aggregate cement cementing materials. A large number of gaps enable cracks generated by the material to exist in a large number and widely dispersed mode, when the material shrinks, cracks generated on a coarse and fine aggregate cement cementing interface can be absorbed by the gaps, stress relaxation is actively carried out, material shrinkage crack deformation is effectively absorbed, macroscopically wide and long cracks are decomposed into fine cracks, and then the micro cracks are absorbed through the gaps, so that the micro cracks cannot be reflected to an asphalt surface layer, and the effects of cracking resistance and crack reflection prevention are achieved.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" as used herein is intended to include both the individual components or both.
The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components via other components.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (7)

1. A design method of an asphalt pavement crack dispersion type base material is characterized by comprising the following components in percentage by weight:
50 to 55 percent of coarse aggregate
15 to 20 percent of interference grade material
25 to 30 percent of filling material
4 to 6 percent of cement
5% -6% of water;
wherein, the mass percentage sum of the coarse aggregate, the interference material, the filling material, the cement and the water is hundred percent, and the interference material and the filling material are used as fine aggregate;
the design method comprises the following steps:
step 1, selecting raw materials for preparing a base material, wherein the selection method comprises the following steps:
1-1, selecting raw materials, selecting graded broken stones from coarse aggregates, selecting melon seed pieces from interference grade materials, selecting continuous graded rice and stone powder from filling materials, and selecting portland cement from cement;
step 1-2, screening out raw materials with required particle sizes, performing a screening test on the raw materials selected in the step 1-1, and screening out the raw materials with the required particle sizes;
step 2, obtaining the density of the raw material: performing physical and mechanical property test to obtain the bulk density rho of the coarse aggregate c Bulk density of coarse aggregate ρ b Bulk density ρ of the fine aggregate f ；
Step 3, calculating the skeleton clearance ratio VCA of the coarse aggregate in the tap state DRC : according to the bulk density rho of the coarse aggregate obtained in the step 2 c Bulk density of coarse aggregate ρ b Calculating and obtaining the framework clearance ratio VCA of the coarse aggregate in the tap state through a formula (1) DRC Equation (1) is as follows:
VCA DRC ＝(1-ρ c /ρ b )×100 (1)；
step 4, calculatingWeight percentage q of fine aggregate f : according to the bulk density rho of the fine aggregate obtained in the step 2 f Combining the framework clearance ratio VCA of the coarse aggregate in the tap state obtained in the step 3 DRC The weight percentage q of the fine aggregate is calculated by the formula (2) f Equation (2) is as follows:
Figure FDA0003906957140000011
step 5, calculating the weight percentage q of the coarse aggregate c : according to q obtained in step 4 f The weight percentage q of the coarse aggregate is calculated by the formula (3) c The formula (3) is specifically as follows:
q c ＝100-q f (3)；
step 6, calculating the weight percentage q of the interference material g The specific calculation steps are as follows:
step 6-1, determining an interference material blocking and coarse material collecting ratio CA: determining the ratio CA = n of interference material blocking to coarse material collecting, wherein the value range of n is 0.27-0.4;
step 6-2, according to the weight percentage q of the fine aggregate obtained in the step 5 c Calculating the weight percentage q of the interference material by a formula (4) g Equation (4) is specifically as follows:
Figure FDA0003906957140000021
step 7, calculating the weight percentage q of the filling material t : according to the weight percentage q of the fine aggregate obtained in the step 5 c And the weight percentage q of the interference material obtained in the step 6-2 g Calculating the weight percentage q of the filler by the formula (5) t Equation (5) is specifically as follows:
q g +q c +q t ＝1 (5)；
step 8, determining the obtained interference gearWeight percent q of the material g The weight percentage q of the obtained filling material t Whether or not within the corresponding value range:
determining the weight percentage q of the interference material obtained in the step 6-2 g Whether or not in the weight percentage q of the interference material g The weight percentage value range of (A);
determining the weight percentage q of the filler obtained in step 7 t Whether or not in the weight percentage q of the filler t The weight percentage value range of (a);
step 9, determining the weight percentage of interference material blocking and filling materials of the asphalt pavement crack dispersion type base layer material according to the result determined in the step 8;
the determination result of step 8 includes the following conditions:
working condition I, weight percentage q of obtained interference material g Within the value range of the weight percent of the interference material, the weight percent q of the obtained filling material t In the range of the weight percentage of the filler;
working condition II, weight percentage q of obtained interference material g Out of the range of the interference material weight percent or/and the weight percent q of the obtained filler t Is not in the range of the weight percentage of the filler;
when the working condition is determined to be one in the step 8, the weight percentage q of the interference material obtained in the step 6-2 is g And the weight percentage q of the filler obtained in the step 7 t Preparing the weight percentages of coarse aggregate, interference material blocking and filling materials of the asphalt pavement crack dispersion type base material;
when the working condition II is determined in the step 8, the value of the ratio CA of the interference material blocking to the coarse aggregate is re-obtained, and the weight percentage q of the interference material blocking is re-calculated by referring to the steps 6 to 8 g And the weight percentage q of the filler t Until the weight percentage q of the interference material is recalculated g And the weight percentage q of the filler t If the first working condition is met, the weight percentage q of the interference material is recalculated g And the weight percentage q of the filler t For preparing asphalt roadThe weight percentage of interference material blocking and filling materials of the surface crack dispersion type base material;
step 10, preparing a bituminous pavement crack dispersed base material: according to the weight percentage q of the fine aggregate obtained in the step 5 c And step 9, determining the weight percentage of interference material blocking and filling materials of the asphalt pavement crack dispersion type base material, and mixing the interference material blocking and filling materials with water and cement to prepare the asphalt pavement crack dispersion type base material.
2. The method for designing a crack-dispersed base material for asphalt pavement according to claim 1, wherein: the particle size range of the raw material with the required particle size in the step 1-2 is as follows:
the grain size of the coarse aggregate ranges from 26.5mm to 31.5mm;
the grain size range of the interference material is 4.75mm-9.5mm;
the grain size of the filler ranges from 0 mm to 4.75mm.
3. The method for designing the asphalt pavement crack dispersion base material according to claim 2, wherein: before step 6, determining the weight percentage q of the coarse aggregate obtained in step 5 c Whether the weight percentage of the coarse aggregate is within the value range;
when determining the weight percentage q of the coarse aggregate obtained in the step 5 c If the weight percentage of the coarse aggregate is within the value range, performing step 6;
when determining the weight percentage q of the coarse aggregate obtained in the step 5 c If the weight percentage of the coarse aggregate is not in the value range, repeating the steps 1-2 to 5, and recalculating the weight percentage q of the coarse aggregate c Until the weight percentage q of the coarse aggregate is recalculated c And 6, performing step 6 within the value range of the weight percentage of the coarse aggregate.
4. The method for designing the asphalt pavement crack dispersion base material according to claim 3, wherein: in step 9, the method for re-taking the value of the interference stock stop-to-coarse stock ratio CA is as follows:
when the step 8 is determined as the second working condition, the weight percentage q of the interference material obtained in the step 6-2 is the same g Exceeding the weight percentage range of interference material blocking, and the weight percentage q of the filler obtained in the step 7 t And (3) when the weight percentage range of the filler is exceeded, adopting a formula (6) to re-obtain the value of the ratio CA of interference material blocking to coarse material collecting, wherein the formula (6) is as follows:
CA＝n-0.05i (6)
in the formula (6), i is the number of times of re-taking the value of the interference stock stop-to-coarse stock ratio CA;
when the step 8 is determined as the second working condition, the weight percentage q of the interference material obtained in the step 6-2 is the same g Lower than the weight percentage range of interference material blocking, and the weight percentage q of the filler obtained in the step 7 t And (3) when the weight percentage of the filler is lower than the range of the weight percentage of the filler, adopting a formula (7) to re-obtain the value of the ratio CA of interference material blocking to coarse material collecting, wherein the formula (7) is as follows:
CA＝n+0.05i (7)；
in the formula (7), i is the number of times of re-taking the value of the interference stock stop to coarse material collection ratio CA;
when the step 8 is determined as the second working condition, the weight percentage q of the interference material obtained in the step 6-2 is the same g Exceeding the weight percentage range of the interference material blocking, and the weight percentage q of the filler obtained in the step 7 t Lower than the weight percentage range of the filler, or the weight percentage q of the interference material obtained in the step 6-2 g Lower than the weight percentage range of interference material blocking, and the weight percentage q of the filler obtained in the step 7 t And (3) if the weight percentage of the filler is exceeded, adopting a formula (6) or a formula (7) to re-obtain the value of the ratio CA of the interference material blocking to the coarse aggregate.
5. The utility model provides a bituminous paving crack dispersion type base course material's road structure which characterized in that: the method for designing the asphalt pavement crack dispersion type base material is carried out according to claim 1, wherein the road structure comprises a high-traffic road structure with the daily traffic of more than 5000 and a low-traffic road structure with the daily traffic of less than 5000, and the method comprises the following steps:
the high traffic volume road structure comprises an asphalt concrete upper surface layer, an asphalt concrete lower surface layer, an asphalt pavement crack dispersion type material base layer, a cement stabilization type base layer and an aggregate type base layer which are paved from top to bottom;
the low traffic volume road structure comprises an asphalt concrete surface layer, an asphalt pavement crack dispersion type material base layer and a cement stabilization type base layer;
the asphalt pavement crack dispersion type material base layer in the high-traffic-volume road structure and the asphalt pavement crack dispersion type material base layer in the low-traffic-volume road structure have the same components;
the asphalt pavement crack dispersion type material base layer comprises the following components in parts by mass: 50-55% of coarse aggregate, 15-20% of interference material, 25-30% of filling material, 4-6% of cement and 5-6% of water.
6. The pavement structure of the asphalt pavement crack dispersion base material according to claim 5, wherein:
the gradation of the upper surface layer of the asphalt concrete in the high traffic volume road structure is SUP-13 type gradation, and the thickness is 3-5cm;
the gradation of the lower surface layer of the asphalt concrete is SUP-25 type gradation, and the thickness is 7-9cm;
the thickness of the base layer of the asphalt pavement crack dispersion material is 15-20cm;
the cement stable subbase layer is a common water stable subbase layer with the thickness of 15-20cm;
the granule subbase is two-ash soil subbase with thickness of 20-25cm.
7. The pavement structure of the asphalt pavement crack dispersion base material according to claim 5, wherein:
the gradation of the asphalt concrete surface layer in the low traffic volume road structure is SUP-20 type gradation, and the thickness is 2-4cm;
the thickness of the base layer of the asphalt pavement crack dispersion type material is 15-20cm;
the cement stable subbase layer is a common water stable subbase layer with the thickness of 15-20cm.
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