CN107777967A - A kind of crack resistance type rubber powder Cement Stable Macadam Mixture and preparation method thereof - Google Patents
A kind of crack resistance type rubber powder Cement Stable Macadam Mixture and preparation method thereof Download PDFInfo
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- CN107777967A CN107777967A CN201711163452.1A CN201711163452A CN107777967A CN 107777967 A CN107777967 A CN 107777967A CN 201711163452 A CN201711163452 A CN 201711163452A CN 107777967 A CN107777967 A CN 107777967A
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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
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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
- 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
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Road Paving Structures (AREA)
Abstract
The present invention relates to a kind of crack resistance type rubber powder Cement Stable Macadam Mixture, and it includes the component of following ratio of weight and number：The parts by weight of graded broken stone mixture 89.5~91.7；Cement：4~5 parts by weight；Road waste tyre rubber powder particle：0.3~0.5 parts by weight；Drinking water：4.0~5.0 parts by weight.The invention further relates to a kind of crack resistance type rubber powder Cement Stable Macadam Mixture preparation method, its preparation method comprises the following steps：(1) prepared by graded broken stone mixture：Compound is prepared using the graded broken stone with following grading limit：(2) mix：Above-mentioned graded broken stone mixture is stirred；4~5 parts by weight of cement are added and continue to mix and stir to uniform state into 89.5~91.7 parts by weight graded broken stone mixtures；Put into 0.3~0.5 parts by weight road waste tyre rubber powder particle；The drinking water that percentage by weight is 4.0~5.0% is added, is stirred.The present invention will be blended with semi-flexible bituminous paving of the road by the use of waste tyre rubber powder particle crack resistance type rubber powder Cement Stable Macadam Mixture as basic unit and reasonably be applied to high-grade highway.
Description
Technical field
The invention belongs to ground surface material field, particularly a kind of crack resistance type rubber powder Cement Stable Macadam Mixture and its preparation
Method.
Background technology
Based on Cement Stable Macadam Mixture bearing capacity is strong, rigidity is big, plate body is good, construction technology it is simple and easy to control with
And the advantages that good warm and humid stability, most built or projects under construction use cement stabilized macadam base asphalt road
Face structure type.Found in substantial amounts of application process, although traditional Cement Stable Macadam Mixture is as bituminous paving base
Layer has lot of advantages, but simultaneously there is also insoluble problem, wherein most distinct issues are exactly caused by its cracking
Bituminous paving Random early Detection problem.Laboratory test and the application display of a large amount of entity projects, either what type of cement
Stabilization gravel structure sheaf, either using which kind of molded design method, either how strictly to control construction quality, either
Under the conditions of which kind of climatic environment, cracking phenomena is all inevitably resulted from.And this cracking phenomena, not only cause pitch
There is reflection crack in surface layer, while rainwater is oozed under the table of Ye Jiangshi roads and progressively penetrates into road structure floor and is difficult to discharge, and directly results in
Road surface bearing capacity is greatly lowered, and under the complexing action of traffic load and temperature environment, crack can drastically extend,
So as to be applied to the critical defect of sub-surface as cement stabilized macadam.
And cracking phenomena is mostly derived from temperature contracting and the drying shrinkage problem that cement stabilized macadam itself can not overcome.Traditional cement
Stabilization gravel compound refers to mix appropriate cement and water in loose gather materials, through mix and stir, be compacted and health after obtain
A kind of inorganic binder reinforce stabilizing material.For material property, Cement Stable Macadam Mixture relies primarily on aquation work
With forming intensity, and environment temperature and humidity to intensity formed with large effect, mix and stir and forming process in, it is extraneous
The change of environment and compound interior moisture content can cause the contraction change of material macroscopic view volume, when this contraction strain exceedes
After the maximum stretching strain that material itself can bear, cracking will be produced.For horizon texture, it is assumed that asphalt surface course and water
It is system between pantostrat between cement-stabilizing broken stone structure sheaf, the cement stabilized macadam as sub-surface is primarily subjected to curved drawing should
Power, and plate body is good, rigidity is larger and tensile strength is too low for material itself so that it is especially sensitive to traffic loading, and is difficult to
Bear flexural tensile stress caused by Heavy Traffic and repeat caused curved drawing fatigue stress under action of traffic loading, so that
Cracking phenomena is inevitably resulted from during use.
In view of the above-mentioned problems, to make full use of, cement stabilized macadam bearing capacity is strong, good (the diffusion-induced stress ability of plate body
By force), the advantages that stability is good, construction technology is simple and easy to control and cost is relatively low, and its drying shrinkage is reduced as far as possible and warm contracting phenomenon is made
Into problem of Cracking, China grey decision system worker wish by take certain measure ensure cement stabilized macadam it is original
Material stiffness is suitably reduced on the basis of technological merit, improves material flexibility, it is preferably suitable to increase its non-deformability
The change of environment temperature and humidity is answered, reduces or prevent it to produce cracking, so as to improve Pavement Condition and extend the life-span.
The material containing cross-linked structure that junked tire is made up of multiple materials such as rubber, carbon black, softening agent, vulcanizing agents,
Main chemical compositions are natural rubber and butadiene-styrene rubber, have the characteristics of high resiliency and high tenacity, have very strong elasticity to recover energy
Power, the rubber powder being processed into by it has the elasticity of natural rubber and crosslinking feature, molecule are in three-dimensional space network knot again
Structure, high resilience are able to maintain that preferable pliability without viscosity and plasticity within the scope of larger temperature.
Waste tire of automobile belongs to solid waste, aboundresources and cheap, in theory, by damaged tire glue
Powder is applied to Cement Treated Material, can not only effectively using waste, turn waste into wealth, economize on resources, it is dirty to reduce black
Dye, and waste rubber tyre powder and the respective technical characteristic of conventional cement stabilization gravel can be given full play to, reduce cement stabilized macadam
Shrinkage cracking, its pliability and non-deformability are significantly improved, so as to improve Pavement Condition and life-span.
In a word, the technology is using waste rubber tyre powder as material modified, and retaining, conventional cement stabilization gravel compound technology is excellent
On the premise of gesture, improve the rigidity of original material by filling appropriate waste rubber tyre powder, increase its pliability and resistance to deformation energy
Power fundamentally slows down or prevented the cracking of semi-rigid material to reduce the sensitiveness to heavily loaded traffic loading, will significantly carry
The performance of high cement stabilized macadam structure sheaf and life-span, there is obvious economic, society and environmental benefit, application prospect
It is wide.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of mixing of crack resistance type rubber powder cement stabilized macadam
Material and preparation method thereof, it can effectively reduce the infringement of heavy-duty vehicle and big flow traffic loading to bituminous paving, effectively extend
Bituminous paving service life.
The present invention solves its technical problem and is achieved through the following technical solutions：
A kind of crack resistance type rubber powder Cement Stable Macadam Mixture, it is characterised in that：Include the component of following ratio of weight and number：
The road waste tyre rubber powder grain diameter is 425 μm~250 μm, i.e. the mesh of 40 mesh~60.
The road waste tyre rubber powder particle meets：Heating loss≤1.0%；Ash content≤15%；Iron content≤0.1%；
Fiber content≤0.5%；Acetone extract≤15%；Content of carbon black >=26%；Rubber hydrocarbon content >=46%；Tensile strength >=
6.5MPa；Elongation rate of tensile failure >=220%.
The graded broken stone mixture has following grading limit：
| Screen size (mm) | 31.5 | 19 | 9.5 | 4.75 | 2.36 | 0.6 | 0.075 |
| The upper limit | 100 | 86 | 58 | 32 | 28 | 15 | 3 |
| Lower limit | 100 | 68 | 38 | 22 | 16 | 8 | 0 |
A kind of crack resistance type rubber powder Cement Stable Macadam Mixture preparation method, it is characterised in that：The preparation method includes
Following steps：
(1) prepared by graded broken stone mixture：
Used gathering materials is sieved step by step according to full sieve aperture from 0.075mm~31.5mm, using with following grading limit
Graded broken stone prepare compound：
| Screen size (mm) | 31.5 | 19 | 9.5 | 4.75 | 2.36 | 0.6 | 0.075 |
| The upper limit | 100 | 86 | 58 | 32 | 28 | 15 | 3 |
| Lower limit | 100 | 68 | 38 | 22 | 16 | 8 | 0 |
(2) mix：
Above-mentioned graded broken stone mixture is stirred；4~5 parts by weight of cement are added to 89.5~91.7 parts by weight levels
With continuing to mix and stir to uniform state in macadam-aggregate mix；
Mechanically or manually put into 0.3~0.5 parts by weight road waste tyre rubber powder particle；
The drinking water that percentage by weight is 4.0~5.0% is added, stirs, that is, obtains crack resistance type rubber powder cement stabilizing
Macadam-aggregate mix finished product.
Optimum moisture content and maximum dry density including determining Cement Stable Macadam Mixture respectively using vibration compaction test method
The step of.
Described optimum moisture content is 4.0%-5.0%, maximum dry density 2.4g/cm3-2.5g/cm3。
Described graded broken stone uses limestone building stones.
The advantages of the present invention are：
1st, crack resistance type rubber powder Cement Stable Macadam Mixture of the invention, using vibration moulding design method and mixes road
With waste tyre rubber powder particle, semi-rigid type base cracking resistance is increased substantially, after mixing rubber powder granule, the anti-drying shrinkage of compound
Ability, temperature resistance contracting ability are improving more than 30%, significantly improve the anti-cracking ability of semi-rigid asphalt pavement, reduce weight
Carrier vehicle and infringement of the big flow traffic loading to bituminous paving, effectively extend bituminous paving service life, there is very strong work
Journey application value.
2nd, crack resistance type rubber powder Cement Stable Macadam Mixture of the invention, the half-flexible pavement formed of constructing, its cost
Not higher than semi-rigid pavement, compared with the larger flexible pavement of asphalt concrete layer thickness, average every square metre of saving construction cost 60
Member or so, calculated with 100km highway, can 5,000 ten thousand yuan of saving construction cost, construction cost is greatly reduced.
3rd, crack resistance type rubber powder Cement Stable Macadam Mixture of the invention, is designed, and be blended with using vibration moulding mode
Flexible bituminous paving of the road by the use of waste tyre rubber powder grain composition rubble as basic unit is reasonably applied to high-grade highway, and this is right
The development for accelerating China's road traffic cause has important and far-reaching meaning.
Brief description of the drawings
Fig. 1 is rubber powder cement stabilized grading crushed stones grading curve.
Embodiment
Below by specific embodiment, the invention will be further described, and following examples are descriptive, is not limit
Qualitatively, it is impossible to which protection scope of the present invention is limited with this.
Embodiment 1
A kind of crack resistance type rubber powder Cement Stable Macadam Mixture, it is characterised in that：Include the component of following ratio of weight and number：
Road waste tyre rubber powder grain diameter is 425 μm, i.e. 40 mesh.Road is waste and old tyre rubber with waste tyre rubber powder particle
Powder and modified glue powder of the modified additive after microwave treatment.It is modified with microwave radiation, extracting, styrene immersion three-step approach useless
Old tire fine glue powder, and the measure of swellbility, the analysis of power spectrum, infrared, Electronic Speculum etc. have been carried out to modified glue powder.By changing
Property, the styrene swellbility enhancing of rubber powder, inorganic content reduction, surface texture change is loose, surface area increase, surface-active
Structure increases.Road waste tyre rubber powder particle meets：Heating loss≤1.0%；Ash content≤15%；Iron content≤0.1%；It is fine
Dimension hplc≤0.5%；Acetone extract≤15%；Content of carbon black >=26%；Rubber hydrocarbon content >=46%；Tensile strength >=
6.5MPa；Elongation rate of tensile failure >=220%.A kind of crack resistance type rubber powder Cement Stable Macadam Mixture preparation method, its preparation method
Comprise the following steps：
1st, prepared by graded broken stone mixture：
1.1 property of raw material：
Rubber powder cement stabilized grading crushed stones compound target mix design uses raw material as 42.5 cement and thick, thin
Gather materials.Cement testing project and result of the test are shown in Table 1.Result of the test shows that the cement institute detection project meets《Highway pavement
Base Construction Technique detailed rules and regulations》(JTG/T F20-2015) technical requirements.
The cement testing result of table 1
Coarse aggregate is 19mm~26.5mm, tri- kinds of 9.5mm~19mm, 4.75mm~9.5mm specifications are gathered materials, pilot project
And result of the test is shown in Table 2.Result of the test shows that the technical indicator of institute's detection project of gathering materials meets《Highway road surface is constructed
Technical manual》For the technical requirements of highway and Class I highway heavy traffic coarse aggregate in (JTG/T F20-2015).
Table 2 gathers materials testing result
Fine aggregate is 0mm~4.75mm Machine-made Sands, and pilot project and result of the test are shown in Table 3.Result of the test shows, the collection
Material detects plasticity index, the content of organic matter, the technical indicator of sulphates content projects and met《Highway road surface is constructed
Technical manual》Will for the technology of highway and Class I highway cement stabilizing fine aggregate in (JTG/T F20-2015)
Ask.
The fine aggregate testing result of table 3
Used gathering materials is sieved step by step according to full sieve aperture from 0.075mm~31.5mm, using with following grading limit
Graded broken stone prepare compound：
| Screen size (mm) | 31.5 | 19 | 9.5 | 4.75 | 2.36 | 0.6 | 0.075 |
| The upper limit | 100 | 86 | 58 | 32 | 28 | 15 | 3 |
| Lower limit | 100 | 68 | 38 | 22 | 16 | 8 | 0 |
1.2 mix proportion design
Rubber powder cement stabilized grading crushed stones mix proportion design is carried out using vibrating compacting test method.According to grading
Macadam-aggregate mix mineral aggregate gradation area requirement determines that gradation composition is shown in Table 4, and gradation curve of mineral aggregate is as shown in Figure 1.
The cement stabilized grading crushed stones gradation design table of table 4
2nd, the determination of compound optimum moisture content, maximum dry density
This experiment uses 40 mesh rubber powders, and rubber powder volume is 0.3%, rubber powder cement stabilized grading crushed stones compound difference
Compound optimum moisture content, maximum dry density are determined using heavy compaction and vibrating compaction method, result of the test is shown in Table 5.
The rubber powder cement stabilized grading crushed stones compaction test results of table 5
The maximum dry density of vibrating compacting and the maximum dry that heavy compaction determines are close it can be seen from the result of the test of table 5
Degree relation is：The ρ heavy compactions of ρ vibrating compactings=1.036.
3rd, 7d unconfined compression strength tests
The optimum moisture content and maximum dry density that the compound for filling 0.3% rubber powder is determined in vibrating compacting test method
Under, respectively according to static pressure and vibratory compaction molding cylinder test specimen, the compactness of static pressure and vibratory compaction molding test specimen is vibration
The 98% of the compound maximum dry density that compaction test determines, size is Φ 15cm × 15cm.Tried by testing standard method
Test, the results are shown in Table 6.
The rubber powder cement stabilized grading crushed stones 7d unconfined compressive strengths of table 6
4th, laboratory's match ratio is determined
According to vibratory compaction molding method result of the test：Compare intensity typical value R0dWith design strength value Rd, caementum measures
4.5%, the intensity typical value R of static pressure and vibratory compaction molding test specimen0dIt is all higher than basic unit design strength value Rd>=4.0MPa, i.e.,
MeetIt is required that.Mixed and stirred from engineering economy and scene, construction technology consideration, upper basic unit's rubber powder cement is steady
The cement dose for determining graded broken stone is defined as 4.5% (outer doping).Mix-design the results are shown in Table 7.
The rubber powder cement stabilized grading crushed stones mix proportion design result of table 7
Embodiment 2
A kind of crack resistance type rubber powder Cement Stable Macadam Mixture, it is characterised in that：Include the component of following ratio of weight and number：
Road waste tyre rubber powder grain diameter is 250 μm, i.e. 60 mesh.Road is waste and old tyre rubber with waste tyre rubber powder particle
Powder and modified glue powder of the modified additive after microwave treatment.It is modified with microwave radiation, extracting, styrene immersion three-step approach useless
Old tire fine glue powder, and the measure of swellbility, the analysis of power spectrum, infrared, Electronic Speculum etc. have been carried out to modified glue powder.By changing
Property, the styrene swellbility enhancing of rubber powder, inorganic content reduction, surface texture change is loose, surface area increase, surface-active
Structure increases.Road waste tyre rubber powder particle meets：Heating loss≤1.0%；Ash content≤15%；Iron content≤0.1%；It is fine
Dimension hplc≤0.5%；Acetone extract≤15%；Content of carbon black >=26%；Rubber hydrocarbon content >=46%；Tensile strength >=
6.5MPa；Elongation rate of tensile failure >=220%.A kind of crack resistance type rubber powder Cement Stable Macadam Mixture preparation method, its preparation method
Comprise the following steps：
1st, prepared by graded broken stone mixture：
1.1 property of raw material：
Rubber powder cement stabilized grading crushed stones compound target mix design uses raw material as 42.5 cement and thick, thin
Gather materials.Cement testing project and result of the test are shown in Table 8.Result of the test shows that the cement institute detection project meets《Highway pavement
Base Construction Technique detailed rules and regulations》(JTG/T F20-2015) technical requirements.
The cement testing result of table 8
Coarse aggregate is 19mm~26.5mm, tri- kinds of 9.5mm~19mm, 4.75mm~9.5mm specifications are gathered materials, pilot project
And result of the test is shown in Table 9.Result of the test shows that the technical indicator of institute's detection project of gathering materials meets《Highway road surface is constructed
Technical manual》For the technical requirements of highway and Class I highway heavy traffic coarse aggregate in (JTG/T F20-2015).
Table 9 gathers materials testing result
Fine aggregate is 0mm~4.75mm Machine-made Sands, and pilot project and result of the test are shown in Table 10.Result of the test shows, the collection
Material detects plasticity index, the content of organic matter, the technical indicator of sulphates content projects and met《Highway road surface is constructed
Technical manual》Will for the technology of highway and Class I highway cement stabilizing fine aggregate in (JTG/T F20-2015)
Ask.
The fine aggregate testing result of table 10
Used gathering materials is sieved step by step according to sieve aperture from 0.075mm~31.5mm, using with following grading limit
Graded broken stone prepares compound：
| Screen size (mm) | 31.5 | 19 | 9.5 | 4.75 | 2.36 | 0.6 | 0.075 |
| The upper limit | 100 | 86 | 58 | 32 | 28 | 15 | 3 |
| Lower limit | 100 | 68 | 38 | 22 | 16 | 8 | 0 |
1.2 mix proportion design
Rubber powder cement stabilized grading crushed stones mix proportion design is carried out using vibrating compacting test method.According to grading
Macadam-aggregate mix mineral aggregate gradation area requirement determines that gradation composition is shown in Table 11.
The cement stabilized grading crushed stones gradation design table of table 11
2nd, the determination of compound optimum moisture content, maximum dry density
This experiment uses 60 mesh rubber powders, and rubber powder volume is 0.5%, rubber powder cement stabilized grading crushed stones compound difference
Compound optimum moisture content, maximum dry density are determined using heavy compaction and vibrating compaction method, result of the test is shown in Table 12.
The rubber powder cement stabilized grading crushed stones compaction test results of table 12
The maximum dry that the maximum dry density of vibrating compacting determines with heavy compaction it can be seen from the result of the test of table 12
Density relationship is：The ρ heavy compactions of ρ vibrating compactings=1.039.
3rd, 7d unconfined compression strength tests
The optimum moisture content and maximum dry density that the compound for filling 0.5% rubber powder is determined in vibrating compacting test method
Under, respectively according to static pressure and vibratory compaction molding cylinder test specimen, the compactness of static pressure and vibratory compaction molding test specimen is vibration
The 98% of the compound maximum dry density that compaction test determines, size is Φ 15cm × 15cm.Tried by testing standard method
Test, the results are shown in Table 13.
The rubber powder cement stabilized grading crushed stones 7d unconfined compressive strengths of table 13
4th, laboratory's match ratio is determined
The rubber powder cement stabilized grading crushed stones mix proportion design result of table 14
Embodiment 3
A kind of crack resistance type rubber powder Cement Stable Macadam Mixture, it is characterised in that：Include the component of following ratio of weight and number：
Road waste tyre rubber powder grain diameter is 425 μm, i.e. 40 mesh.Road is waste and old tyre rubber with waste tyre rubber powder particle
Powder and modified glue powder of the modified additive after microwave treatment.It is modified with microwave radiation, extracting, styrene immersion three-step approach useless
Old tire fine glue powder, and the measure of swellbility, the analysis of power spectrum, infrared, Electronic Speculum etc. have been carried out to modified glue powder.By changing
Property, the styrene swellbility enhancing of rubber powder, inorganic content reduction, surface texture change is loose, surface area increase, surface-active
Structure increases.Road waste tyre rubber powder particle meets：Heating loss≤1.0%；Ash content≤15%；Iron content≤0.1%；It is fine
Dimension hplc≤0.5%；Acetone extract≤15%；Content of carbon black >=26%；Rubber hydrocarbon content >=46%；Tensile strength >=
6.5MPa；Elongation rate of tensile failure >=220%.A kind of crack resistance type rubber powder Cement Stable Macadam Mixture preparation method, its preparation method
Comprise the following steps：
1st, prepared by graded broken stone mixture：
1.1 property of raw material：
Rubber powder cement stabilized grading crushed stones compound target mix design uses raw material as 42.5 cement and thick, thin
Gather materials.Cement testing project and result of the test are shown in Table 15.Result of the test shows that the cement institute detection project meets《Highway pavement
Base Construction Technique detailed rules and regulations》(JTG/T F20-2015) technical requirements.
The cement testing result of table 15
Coarse aggregate is 19mm~26.5mm, tri- kinds of 9.5mm~19mm, 4.75mm~9.5mm specifications are gathered materials, pilot project
And result of the test is shown in Table 16.Result of the test shows that the technical indicator of institute's detection project of gathering materials meets《Highway road surface is applied
Work technical manual》Will for the technology of highway and Class I highway heavy traffic coarse aggregate in (JTG/T F20-2015)
Ask.
Table 16 gathers materials testing result
Fine aggregate is 0mm~4.75mm Machine-made Sands, and pilot project and result of the test are shown in Table 17.Result of the test shows, the collection
Material detects plasticity index, the content of organic matter, the technical indicator of sulphates content projects and met《Highway road surface is constructed
Technical manual》Will for the technology of highway and Class I highway cement stabilizing fine aggregate in (JTG/T F20-2015)
Ask.
The fine aggregate testing result of table 17
Used gathering materials is sieved step by step according to sieve aperture from 0.075mm~31.5mm, using with following grading limit
Graded broken stone prepares compound：
| Screen size (mm) | 31.5 | 19 | 9.5 | 4.75 | 2.36 | 0.6 | 0.075 |
| The upper limit | 100 | 86 | 58 | 32 | 28 | 15 | 3 |
| Lower limit | 100 | 68 | 38 | 22 | 16 | 8 | 0 |
1.2 mix proportion design
Rubber powder cement stabilized grading crushed stones mix proportion design is carried out using vibrating compacting test method.According to grading
Macadam-aggregate mix mineral aggregate gradation area requirement determines that gradation composition is shown in Table 18.
The cement stabilized grading crushed stones gradation design table of table 18
2nd, the determination of compound optimum moisture content, maximum dry density
This experiment uses 40 mesh rubber powders, and rubber powder volume is 0.3%, rubber powder cement stabilized grading crushed stones compound difference
Compound optimum moisture content, maximum dry density are determined using heavy compaction and vibrating compaction method, result of the test is shown in Table 19.
The rubber powder cement stabilized grading crushed stones compaction test results of table 19
The maximum dry that the maximum dry density of vibrating compacting determines with heavy compaction it can be seen from the result of the test of table 19
Density relationship is：The ρ heavy compactions of ρ vibrating compactings=1.034.
3rd, 7d unconfined compression strength tests
The optimum moisture content and maximum dry density that the compound for filling 0.3% rubber powder is determined in vibrating compacting test method
Under, respectively according to static pressure and vibratory compaction molding cylinder test specimen, the compactness of static pressure and vibratory compaction molding test specimen is vibration
The 98% of the compound maximum dry density that compaction test determines, size is Φ 15cm × 15cm.Tried by testing standard method
Test, the results are shown in Table 20.
The rubber powder cement stabilized grading crushed stones 7d unconfined compressive strengths of table 20
4th, laboratory's match ratio is determined
The rubber powder cement stabilized grading crushed stones mix proportion design result of table 21
Experimental Comparison：
Choose embodiment 1 in obtain crack resistance type cement stabilized macadam compound A, embodiment 2 obtain it is crack resistance type cement stabilized
Crack resistance type cement stabilized macadam compound C is obtained in macadam-aggregate mix B, embodiment 3, and without road waste tyre rubber powder
The ordinary cement stabilization gravel compound of grain is tested.
1. tensile splitting strength analysis of experiments
The 90d tensile splitting strengths of table 22
| Project | A | B | C | Benchmark |
| 90d tensile splitting strengths | 1.112 | 1.192 | 1.183 | 1.589 |
As can be seen from Table 22, rubber powder cement stabilized macadam tensile splitting strength declines with the increase of rubber powder volume.
Moreover, in the case of rubber powder incorporation identical, the small cement stabilized macadam cleavage strength loss of rubber powder size is few, knows through analysis：
(1) tensile splitting strength is mainly influenceed by the cohesive force between cement matrix of gathering materials, because rubber powder is physical with cement matrix
Matter differs greatly, and the caking property between them is poor, thus causes the tensile splitting strength of test specimen to decline.(2) rubber powder size
Its different tensile splitting strength loss late also differ, and the rubber powder size of incorporation is smaller, and tensile splitting strength loss late is smaller.
Reason is that rubber grain is thinner, and surface area is bigger, is bonded with cement matrix more preferable.
2. freezing-thawing test is analyzed
Anti-freezing property result of the test is shown in Table 23.
The antifreezing test result of table 23
| Project | A | B | C | Benchmark |
| 90d compression strength | 9.2 | 8.8 | 9.1 | 11.5 |
| Frozen coefficient | 0.94 | 0.88 | 0.90 | 0.86 |
As known from Table 16, the cement stabilized macadam frozen coefficient for mixing rubber powder is more slightly larger than traditional cements stabilization gravel.Study carefully it
Reason, one side rubber grain is close can gather materials in more filling concrete stabilization gravels between space, slow down or reduce water
The entrance divided, so as to improve its anti-freezing property；Another aspect rubber grain occupies the space between gathering materials, in space
Moisture freezing and expansion, what is extruded first is rubber grain, and because rubber grain can produce moderate finite deformation, it is swollen to reduce icing
Swollen stress, so significantly reduce water body freezing and expansion and the space wall of compound is caused to extrude destruction.
3. shrinkage test is analyzed
This experiment carries out dry shrinkage testing, and carries out shrinkage performance contrast test with benchmark match ratio.Test index and experiment
It the results are shown in Table 24.
The Cement Stable Macadam Mixture drying shrinkage tear factor table of table 24
As can be seen from Table 24, after mixing a certain amount of rubber powder granule, the anti-drying shrinkage ability of compound obtains to a certain extent
To raising.Its reason is probably that rubber grain has larger water absorbing capacity, and from ambient absorption water aquation occurs for cement first
Reaction, then capture the moisture that rubber grain absorbs previously and recover itself a part of drying shrinkage；On the other hand, rubber have compared with
Big elasticity, caused by moisture evaporation capillary tension, absorption water and molecular separating force are cut down to a certain extent
Effect, so as to reduce drying shrinkage.
This experiment temperature contracting experiment, and carry out temperature contraction performance contrast test with benchmark match ratio.Test index and result of the test
It is shown in Table 25.
The Cement Stable Macadam Mixture temperature contracting tear factor table of table 25
As can be seen from Table 25, after mixing a certain amount of rubber powder granule, the temperature resistance contracting ability of compound obtains to a certain extent
To raising.Its reason is probably that rubber has larger elasticity, has been cut down to a certain extent caused by thermograde
The contraction of compound.
Although disclosed embodiments of the invention and accompanying drawing, those skilled in the art can manage for the purpose of illustration
Solution, do not departing from the present invention and spirit and scope of the appended claims in, it is various replace, change and modifications all be it is possible,
Therefore the scope of the present invention is not limited to embodiment and accompanying drawing disclosure of that.
Claims (8)
- A kind of 1. crack resistance type rubber powder Cement Stable Macadam Mixture, it is characterised in that：Include the component of following ratio of weight and number：
- 2. crack resistance type rubber powder Cement Stable Macadam Mixture according to claim 1, it is characterised in that：The road damaged tire Rubber powder granule particle diameter is 425 μm~250 μm, i.e. the mesh of 40 mesh~60.
- 3. crack resistance type rubber powder Cement Stable Macadam Mixture according to claim 1, it is characterised in that：The road damaged tire Rubber powder granule meets：Heating loss≤1.0%；Ash content≤15%；Iron content≤0.1%；Fiber content≤0.5%；Acetone is taken out Go out thing≤15%；Content of carbon black >=26%；Rubber hydrocarbon content >=46%；Tensile strength >=6.5MPa；Elongation rate of tensile failure >= 220%.
- 4. crack resistance type rubber powder Cement Stable Macadam Mixture according to claim 1, it is characterised in that：The graded broken stone mixes Closing material has following grading limit：
Screen size (mm) 31.5 19 9.5 4.75 2.36 0.6 0.075 The upper limit 100 86 58 32 28 15 3 Lower limit 100 68 38 22 16 8 0 。 - 5. one kind crack resistance type rubber powder Cement Stable Macadam Mixture preparation method as described in claim 1-4 any one, it is special Sign is：The preparation method comprises the following steps：(1) prepared by graded broken stone mixture：Used gathering materials is sieved step by step according to full sieve aperture from 0.075mm~31.5mm, using the level with following grading limit Compound is prepared with rubble：
Screen size (mm) 31.5 19 9.5 4.75 2.36 0.6 0.075 The upper limit 100 86 58 32 28 15 3 Lower limit 100 68 38 22 16 8 0 (2) mix：Above-mentioned graded broken stone mixture is stirred；4~5 parts by weight of cement are added broken to 89.5~91.7 parts by weight gradings Continue to mix and stir to uniform state in stone compound；Mechanically or manually put into 0.3~0.5 parts by weight road waste tyre rubber powder particle；The drinking water that percentage by weight is 4.0~5.0% is added, stirs, that is, obtains crack resistance type rubber powder cement stabilized macadam Compound finished product. - 6. crack resistance type rubber powder Cement Stable Macadam Mixture preparation method according to claim 5, it is characterised in that：Including adopting The step of determining the optimum moisture content and maximum dry density of Cement Stable Macadam Mixture respectively with vibration compaction test method.
- 7. crack resistance type rubber powder Cement Stable Macadam Mixture preparation method according to claim 6, it is characterised in that：Described Optimum moisture content is 4.0%-5.0%, maximum dry density 2.4g/cm3-2.5g/cm3。
- 8. crack resistance type rubber powder Cement Stable Macadam Mixture preparation method according to claim 5, it is characterised in that：Described Graded broken stone uses limestone building stones.
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