CN108503303A - A kind of Cement Cold Regeneration Technology mixture VVTM design methods - Google Patents
A kind of Cement Cold Regeneration Technology mixture VVTM design methods Download PDFInfo
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- CN108503303A CN108503303A CN201810306744.4A CN201810306744A CN108503303A CN 108503303 A CN108503303 A CN 108503303A CN 201810306744 A CN201810306744 A CN 201810306744A CN 108503303 A CN108503303 A CN 108503303A
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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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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00198—Characterisation or quantities of the compositions or their ingredients expressed as mathematical formulae or equations
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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
- 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
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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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Abstract
The present invention provides a kind of Cement Cold Regeneration Technology mixture VVTM design methods, can quickly determine the volume and cement dose newly to gather materials in Cement Cold Regeneration Technology mixture, and the high-performance cement cold regeneration mix designed has excellent pavement performance.Embodiment statistics indicate that, the Cement Cold Regeneration Technology mixture that the present invention designs can meet design requirement.
Description
Technical field
The present invention relates to Transportation and Civil Engineering applied technical fields more particularly to a kind of Cement Cold Regeneration Technology mixture VVTM to set
Meter method.
Background technology
Currently, the Cement Cold Regeneration Technology Mixture Design Method to gain universal acceptance not yet in global range.China《Highway
Applied of Asphalt Pavement Recycle Technique specification》(JTG F41-2008) not specific volume design method of newly gathering materials, cold-regenerated road surface work
New gather materials more for adjustment regeneration layer thickness rather than the whether optimal consideration of performance is mixed in journey；It is determined using heavy compaction method best
Moisture content is bigger than normal, maximum dry density is less than normal.
The design method of China's Cement Cold Regeneration Technology mixture generally uses《Highway road surface construction technique normalizing》(JTGT
F20-2015), there is following limitation：
(1) aggregate grading design：The stabilized with inorganic binder cold regeneration mix grading model provided in JTG F41-2008
It encloses very wide, can also be met the requirements without design, thus lead to newly to gather materials in engineering practice that more consideration is given to meet again for volume design
Generating layer thickness requirement, and it is different to Cement Cold Regeneration Technology mixture performance influence degree to ignore specification of gathering materials.In addition, new
The volume that gathers materials is empirically determined, and is not bound with old pavement milling thickness and regeneration layer thickness is designed, in engineering practice usually
It needs repeatedly to adjust the volume that newly gathers materials according to the practical compacted thickness of field test section, process is not only complicated, also influences work
Cheng Jindu.
(2) specimen Design method：In JTG E51-2009 for stabilized with inorganic binder material using Static compaction method with
Modified compaction test method is unable to the compaction of accurate simulation wheel road pavement, and shaping test piece density can not reflect and be open to traffic for many years
Area densities afterwards, test specimen physical and mechanical property are not inconsistent with practical road surface.
Invention content
In consideration of it, the purpose of the present invention is to provide a kind of Cement Cold Regeneration Technology mixture VVTM design methods.Using this hair
The design method of bright offer can quickly, accurately determine the volume, optimum moisture content, maximum newly to gather materials in Cement Cold Regeneration Technology mixture
Dry density and cement dose, and the high-performance cement cold regeneration mix designed has excellent pavement performance.
In order to achieve the above-mentioned object of the invention, the present invention provides following technical scheme：
A kind of Cement Cold Regeneration Technology mixture VVTM design methods, include the following steps：
(1) according to offer Cement Cold Regeneration Technology mixture shown in formula (1) formula：
RCB：Coarse aggregate：Fine aggregate=100-C-X：C：X formulas (1),
In formula (1)：C- coarse aggregate quality volumes, %,
X- fine aggregate quality volumes, %；
Slightly, fine aggregate quality volume design method is as follows：
(a) when (Y-1)/Y × 100 >=35%, C=(Y-1)/Y × 100-20, X=20%；
(b) when 20%≤(Y-1)/Y × 100<When 35%, C=20%, X=(Y-1)/Y × 100-20；
(c) when (Y-1)/Y × 100<When 20%, C=(Y-1)/Y × 100, X=0%；
Wherein Y is the new volume coefficient that gathers materials,
Y=0.875HR/hxFormula (2),
In formula (2)：Y- newly gathers materials volume coefficient；
HRCold renewal structure sheaf design thickness, cm；
HxOld pavement base milling thickness, cm；
(2) mixture for preparing different cement doses, determines optimum moisture content and maximum dry density；
(3) different caementums in the step (2) are calculated separately by compactness of subbase 98% or base roadbed 97%
The dry density for measuring compound test specimen is molded different cement by the optimum moisture content that the dry density and the step (2) that calculate obtain
The VVTM test specimens of dosage；
(4) the VVTM test specimens for obtaining the step (3) carry out Standard Curing, the VVTM test specimens after testing standard health
7d unconfined compressive strengths and 7d cleavage strengths, 7d unconfined compressive strengths and 7d cleavage strengths are independently calculated by formula (3)
It arrives：
In formula (3)：R0.95The intensity typical value of fraction 95%, MPa, wherein the 7d of fraction 95% is without lateral spacing resistance to compression
Intensity typical value is expressed as Rc0.95, the 7d cleavage strength typical values of fraction 95% are expressed as Ri0.95；
Test piece intensity average value, MPa, wherein test specimen 7d unconfined compressive strengths average value are expressed asTest specimen 7d
Cleavage strength average value is expressed as
The standard deviation of S- test piece intensities, MPa；
CvThe coefficient of variation of the coefficient of variation of test piece intensity, %, wherein test specimen 7d unconfined compressive strengths is expressed as Cv,c,
The coefficient of variation of test specimen 7d cleavage strengths is expressed as Cv,i；
It is required according to cement dose shown in strength criterion shown in table 1 and table 2, determines cement dose；If acquired results cannot
Reach the strength criterion, readjusts cement dose or the new volume that gathers materials is designed；
1 Cement Cold Regeneration Technology mixture strength design standard of table
| Layer position | Compactness (%) | 7d cleavage strengths (MPa) | 7d unconfined compressive strengths (MPa) |
| Base | ≥98 | ≥0.40 | ≥4.0 |
| Underlayment | ≥97 | ≥0.35 | ≥3.5 |
2 Cement Cold Regeneration Technology mixture cement dose design standard of table
Preferably, the grain size of coarse aggregate is 15~30mm or 10~25mm in the step (1), the grain size of fine aggregate≤
2.36mm。
Preferably, the step (2) includes：It is 3~4.5%, underlayment cement additive by the water base additive capacity of base
Cement dose is arranged for interval with 0.5% in amount 2.5~4%, prepares the mixture of different cement doses, and variation moisture content carries out
Simulation research on vibrating compaction test, when obtaining maximum dry density, the moisture content of mixture is optimum moisture content.
Preferably, the simulation research on vibrating compaction test parameter includes：30 ± 1Hz of working frequency, quiet eccentric moment 7.6 ±
0.02kN, 1.2 ± 0.01kN of weight of getting on the bus, 1.8 ± 0.01kN of weight of getting off, vibration compaction test time are 110 ± 10s.
Preferably, it is shaped in the step (3)：It is tried using the VVTM of vertical vibration compaction moulding difference cement dose
Part, the parameter that the vertical vibration is compacted include：Working frequency 30 ± 1Hz, quiet 7.6 ± 0.02kN of eccentric moment, weight of getting on the bus
1.2 ± 0.01kN, 1.8 ± 0.01kN of weight of getting off.
Preferably, VVTM test specimens are cylinder, a diameter of 150mm of the cylinder, the cylinder in the step (3)
The height of body is 150mm.
The present invention provides a kind of Cement Cold Regeneration Technology mixture VVTM design methods, it can quickly determine that Cement Cold Regeneration Technology mixes
The volume and cement dose newly to gather materials in material, and the high-performance cement cold regeneration mix designed has excellent pavement performance.It is real
Apply example statistics indicate that, the Cement Cold Regeneration Technology mixture that the present invention designs can meet design requirement.
Description of the drawings
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is Cement Cold Regeneration Technology mixture cement dose 7d unconfined compressive strength relationships made from the embodiment of the present invention 1
Curve graph；
Fig. 2 is Cement Cold Regeneration Technology mixture cement dose 7d cleavage strength graph of relation made from the embodiment of the present invention 1.
Specific implementation mode
The present invention provides a kind of Cement Cold Regeneration Technology mixture VVTM design methods, include the following steps：
(1) according to offer Cement Cold Regeneration Technology mixture shown in formula (1) formula：
RCB：Coarse aggregate：Fine aggregate=100-C-X：C：X formulas (1),
In formula (1)：C- coarse aggregate quality volumes, %,
X- fine aggregate quality volumes, %；
Slightly, fine aggregate quality volume design method is as follows：
(a) when (Y-1)/Y × 100 >=35%, C=(Y-1)/Y × 100-20, X=20%；
(b) when 20%≤(Y-1)/Y × 100<When 35%, C=20%, X=(Y-1)/Y × 100-20；
(c) when (Y-1)/Y × 100<When 20%, C=(Y-1)/Y × 100, X=0%；
Wherein Y is the new volume coefficient that gathers materials,
Y=0.875HR/hxFormula (2),
In formula (2)：Y- newly gathers materials volume coefficient；
HRCold renewal structure sheaf design thickness, cm；
HxOld pavement base milling thickness, cm；
(2) mixture for preparing different cement doses, determines optimum moisture content and maximum dry density；
(3) different caementums in the step (2) are calculated separately by compactness of subbase 98% or base roadbed 97%
The dry density for measuring compound test specimen is molded different cement by the optimum moisture content that the dry density and the step (2) that calculate obtain
The VVTM test specimens of dosage；
(4) the VVTM test specimens for obtaining the step (3) carry out Standard Curing, the VVTM test specimens after testing standard health
7d unconfined compressive strengths and 7d cleavage strengths, 7d unconfined compressive strengths and 7d cleavage strengths are independently calculated by formula (3)
It arrives：
In formula (3)：R0.95The intensity typical value of fraction 95%, MPa, wherein the 7d of fraction 95% is without lateral spacing resistance to compression
Intensity typical value is expressed as Rc0.95, the 7d cleavage strength typical values of fraction 95% are expressed as Ri0.95；
Test piece intensity average value, MPa, wherein test specimen 7d unconfined compressive strengths average value are expressed asTest specimen 7d
Cleavage strength average value is expressed as
The standard deviation of S- test piece intensities, MPa；
CvThe coefficient of variation of the coefficient of variation of test piece intensity, %, wherein test specimen 7d unconfined compressive strengths is expressed as Cv,c,
The coefficient of variation of test specimen 7d cleavage strengths is expressed as Cv,i；
It is required according to cement dose shown in strength criterion shown in table 1 and table 2, determines cement dose；If acquired results cannot
Reach the strength criterion, readjusts cement dose or the new volume that gathers materials is designed；
1 Cement Cold Regeneration Technology mixture strength design standard of table
| Layer position | Compactness (%) | 7d cleavage strengths (MPa) | 7d unconfined compressive strengths (MPa) |
| Base | ≥98 | ≥0.40 | ≥4.0 |
| Underlayment | ≥97 | ≥0.35 | ≥3.5 |
2 Cement Cold Regeneration Technology mixture cement dose design standard of table
In the present invention, according to offer Cement Cold Regeneration Technology mixture shown in formula (1) formula：
RCB：Coarse aggregate：Fine aggregate=100-C-X：C：X formulas (1),
In formula (1)：C- coarse aggregate quality volumes, %,
X- fine aggregate quality volumes, %；
Slightly, fine aggregate quality volume design method is as follows：
(a) when (Y-1)/Y × 100 >=35%, C=(Y-1)/Y × 100-20, X=20%；
(b) when 20%≤(Y-1)/Y × 100<When 35%, C=20%, X=(Y-1)/Y × 100-20；
(c) when (Y-1)/Y × 100<When 20%, C=(Y-1)/Y × 100, X=0%；
Wherein Y is the new volume coefficient that gathers materials,
Y=0.875HR/hxFormula (2),
In formula (2)：Y- newly gathers materials volume coefficient；
HRCold renewal structure sheaf design thickness, cm；
HxOld pavement base milling thickness, cm.
In the present invention, the grain size of the coarse aggregate is preferably 15~30mm or 10~25mm；The grain size of fine aggregate is preferred
≤2.36mm。
In the present invention, the specification of the coarse aggregate preferably meets and is required shown in table 3：
The specification of 3 coarse aggregate of table
In the present invention, the technology of the coarse aggregate is required preferably to meet shown in table 4 and be required：
The technology requirement of 4 coarse aggregate of table
| Technical indicator | Apparent relative density | Elongated particles (%) | Crush values (%) |
| Technology requirement | ≥2.6 | ≤20 | ≤26 |
In the present invention, the technology of the fine aggregate is required preferably to meet shown in table 5 and be required：
The technology requirement of 5 fine aggregate of table
| Pilot project | Apparent relative density | Sand equivalent (%) | >The parts 0.3mm robustness (%) | Corner angle (s) |
| Technology requirement | ≥2.5 | ≥60 | ≥12 | ≥30 |
In the present invention, the technology of the RCB is required preferably to meet shown in table 6 and be required：
The technology requirement of 6 RCB of table
| Pilot project | Moisture content (%) | RCB gradings | Cement dose (%) | Sand equivalent (%) |
| Technology requirement | Actual measurement | Actual measurement | Actual measurement | >55 |
In the present invention, the grading of the RCB preferably meets and is required shown in table 7：
7 RCB gradings of table
| Screen size (mm) | 37.5 | 31.5 | 26.5 | 19 | 9.5 | 4.75 | 2.36 | 0.6 | 0.075 |
| Pass through percentage (%) | 100 | 98.9 | 98.0 | 96.3 | 83.1 | 62 | 42.4 | 17.4 | 5.1 |
The present invention provides raw material according to the restriction that the above-mentioned grading to gathering materials and technology require, and obtained raw material is prepared not
With the mixture of cement dose, the optimum moisture content and maximum dry density of the mixture are determined.In the present invention, it determines best
The method of moisture content and maximum dry density preferably includes：It is that 3~4.5%, underlayment cement adds by base's cement additive amount
Dosage 2.5~4% is arranged cement dose for interval with 0.5%, prepares the mixture of different cement doses, variation moisture content into
Row simulation research on vibrating compaction test, when obtaining maximum dry density, the moisture content of mixture is optimum moisture content；More preferably choose cement
Dosage is 3.0%, 3.5%, 4.0% and 4.5% optimum moisture content and maximum dry density for determining mixture.
In the present invention, the simulation research on vibrating compaction test parameter preferably includes：30 ± 1Hz of working frequency, quiet eccentric moment 7.6
± 0.02kN, 1.2 ± 0.01kN of weight of getting on the bus, 1.8 ± 0.01kN of weight of getting off, vibration compaction test time are 110 ± 10s.
In the present invention, the cement preferably satisfies performance requirement shown in table 8：
The technology requirement of 8 cement of table
The present invention calculates separately different cement dose mixtures by compactness of subbase 98% or base roadbed 97% and obtains
To the due dry density of test specimen the VVTM examinations of different cement dose mixtures are molded by the dry density and optimum moisture content calculated
Part.In the present invention, it is preferred to using the VVTM test specimens of vertical vibration compaction moulding difference cement dose, the vertical vibration compacting
Parameter preferably include：30 ± 1Hz of working frequency, quiet 7.6 ± 0.02kN of eccentric moment, 1.2 ± 0.01kN of weight of getting on the bus get off
1.8 ± 0.01kN of weight.
In the present invention, the VVTM test specimens are preferably cylinder, and the diameter of the cylinder is preferably 150mm, described
The highly preferred of cylinder is 150mm.
In the present invention, in the VVTM test specimens cement dose preferably be respectively 3.0%, 3.5%, 4.0% and
4.5%.
After obtaining VVTM test specimens, the present invention carries out Standard Curing, the VVTM after testing standard health to the VVTM test specimens
The 7d unconfined compressive strengths and 7d cleavage strengths of test specimen, 7d unconfined compressive strengths and 7d cleavage strengths independently press formula (3)
It is calculated：
In formula (3)：R0.95The intensity typical value of fraction 95%, MPa, wherein the 7d of fraction 95% is without lateral spacing resistance to compression
Intensity typical value is expressed as Rc0.95, the 7d cleavage strength typical values of fraction 95% are expressed as Ri0.95；
Test piece intensity average value, MPa, wherein test specimen 7d unconfined compressive strengths average value are expressed asTest specimen 7d
Cleavage strength average value is expressed as
The standard deviation of S- test piece intensities, MPa；
CvThe coefficient of variation of the coefficient of variation of test piece intensity, %, wherein test specimen 7d unconfined compressive strengths is expressed as Cv,c,
The coefficient of variation of test specimen 7d cleavage strengths is expressed as Cv,i；
It is required according to cement dose shown in strength criterion shown in table 1 and table 2, determines cement dose；If acquired results cannot
Reach the strength criterion, readjusts cement dose or the new volume that gathers materials is designed；
1 Cement Cold Regeneration Technology mixture strength design standard of table
| Layer position | Compactness (%) | 7d cleavage strengths (MPa) | 7d unconfined compressive strengths (MPa) |
| Base | ≥98 | ≥0.40 | ≥4.0 |
| Underlayment | ≥97 | ≥0.35 | ≥3.5 |
2 Cement Cold Regeneration Technology mixture cement dose design standard of table
In the present invention, the temperature of the Standard Curing is preferably 20 ± 2 DEG C, the humidity of the Standard Curing be 95% with
On, the test specimen of the Standard Curing is preferably 6d.
In the present invention, after Standard Curing, the present invention is preferably by the constant temperature of 20 ± 2 DEG C of the test specimen immersion by Standard Curing
It is spare in sink, for detecting 7d unconfined compressive strengths and 7d cleavage strengths.
Cement Cold Regeneration Technology mixture VVTM design methods provided by the invention are carried out specifically with reference to embodiment
It is bright, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
Select Portland cement, coarse aggregate, fine aggregate, RCB.Its technological property test result meets above-mentioned requirements.
Old pavement base milling thickness hx=13cm, Cement Cold Regeneration Technology structure sheaf design thickness HR=18cm.According to formula
(2), it can be calculated the new volume coefficient Y that gathers materials：
Y=0.875HR/hx=0.875 × 18/13=1.21
Determine that thickness is gathered materials volume
(Y-1)/Y × 100=17%<20%
Therefore, coarse aggregate volume C=17%, fine aggregate volume X=0%.
Determine Cement Cold Regeneration Technology mixture gradation
Cement Cold Regeneration Technology mixture gradation is：
RCB：Coarse aggregate=100-C：C=83:17
Cement Cold Regeneration Technology mixture formate gradation composition is shown in Table 9 after synthesis.
9 Cement Cold Regeneration Technology mixture formate gradation composition of table
| Sieve pore (mm) | 37.5 | 31.5 | 26.5 | 19 | 9.5 | 4.75 | 2.36 | 0.6 | 0.075 |
| Pass through percentage (%) | 100 | 98.9 | 97.5 | 67.5 | 46.3 | 33.3 | 22.7 | 10.2 | 2.7 |
It is 3.0%, 3.5%, 4.0% and 4.5% to choose cement dose, and mixture is determined using vertical vibration compacting process
Optimum moisture content and maximum dry density, test parameters preferably include：Working frequency 30Hz, quiet eccentric moment 7.6kN, upper car weight
Measure 1.2kN, weight of getting off 1.8kN, vibration compaction test time 110s.
(1) 5 parts of dry mass m are prepared by formate gradation composition requirementsFor the sample of 5500g；
(2) it is (m to take 1 part of sample of drying, addition predetermined qualityj+ms) × water, uniform mixing；Then, corresponding water is added
Mud, again uniform mixing obtain wet mixture.Wherein, wiMoisture content in cement is added when being tested for ith, is the experiment
When be added cement quality, 1,2,3,4,5；
(3) test specimen is prepared using simulation research on vibrating compaction test method；
(4) water content and density are mixed and stirred according to 5 groups, draws density-water content relation curve, hump shape hump is indulged
Abscissa is respectively maximal density ρmaxWith optimum moisture content ω0。
Cement Cold Regeneration Technology mixture maximum dry density, optimum moisture content are shown in Table 10.
The different cement mixing content cold regeneration mix maximum dry densities of table 10, optimum moisture content
It is 3.0%, 3.5%, 4.0% and 4.5% to choose cement dose, and VVTM is made respectively according to different cement doses
Test specimen；
Measure each group cement consumption test specimen carry out 7d unconfined compression strength tests and 7d cleavage strengths experiment, in conjunction with table 1,
2 technology of table requires and engineering experience, comprehensive to determine cement dose；
Test specimen is prepared using VVTM and carries out Standard Curing (20 ± 2 DEG C of temperature, 95% or more humidity) 6d, 20 ± 2 DEG C full
For 24 hours, next day carries out unconfined compression strength test, different cement dose VVTM to water
Test specimen cold regeneration mix 7d unconfined compressive strengths the results are shown in Table 12 and Fig. 1, different cement dose VVTM test specimens
Cold regeneration mix 7d cleavage strengths the results are shown in Table 13 and Fig. 2.By result in table 11, table 12 and Fig. 1~2 it is found that caementum
Amount can meet design requirement for 3.5% Cement Cold Regeneration Technology mixture, it was demonstrated that suggest that cement dose range can be for reference herein.
The different cement dose cold regeneration mix VVTM test specimen 7d unconfined compressive strengths of table 11
The different cement dose cold regeneration mix VVTM test specimen 7d cleavage strengths of table 12
Embodiment 2
Select Portland cement, coarse aggregate, fine aggregate, RCB.Its technological property test result meets above-mentioned requirements.
Old pavement base milling thickness hx=14cm, Cement Cold Regeneration Technology structure sheaf design thickness HR=20cm.According to formula
(2), it can be calculated the new volume coefficient Y that gathers materials：
Y=0.875HR/hx=0.875 × 20/14=1.25
Determine that thickness is gathered materials volume
20%≤(Y-1)/Y × 100=31%<35%
Therefore, coarse aggregate volume C=20%, fine aggregate volume X=(Y-1)/Y × 100-20=11%.
Determine Cement Cold Regeneration Technology mixture gradation
Cement Cold Regeneration Technology mixture gradation is：
RCB：Coarse aggregate：Fine aggregate=100-C-X：C：X=69:20:11
Cement Cold Regeneration Technology mixture formate gradation composition is shown in Table 13 after synthesis.
13 Cement Cold Regeneration Technology mixture formate gradation composition of table
| Sieve pore (mm) | 37.5 | 31.5 | 26.5 | 19 | 9.5 | 4.75 | 2.36 | 0.6 | 0.075 |
| Pass through percentage (%) | 100 | 98.5 | 97.8 | 78.5 | 63.4 | 48.3 | 30.7 | 14.2 | 4.6 |
It is 3.0%, 3.5%, 4.0% and 4.5% to choose cement dose, and mixture is determined using vertical vibration compacting process
Optimum moisture content and maximum dry density, test parameters preferably include：Working frequency 30Hz, quiet eccentric moment 7.6kN, upper car weight
Measure 1.2kN, weight of getting off 1.8kN, vibration compaction test time 110s.
(1) 5 parts of dry mass m are prepared by formate gradation composition requirementsFor the sample of 5500g；
(2) it is (m to take 1 part of sample of drying, addition predetermined qualityj+ms) × water, uniform mixing；Then, corresponding water is added
Mud, again uniform mixing obtain wet mixture.Wherein, wiMoisture content in cement is added when being tested for ith, is the experiment
When be added cement quality, 1,2,3,4,5；
(3) test specimen is prepared using simulation research on vibrating compaction test method；
(4) water content and density are mixed and stirred according to 5 groups, draws density-water content relation curve, hump shape hump is indulged
Abscissa is respectively maximal density ρmaxWith optimum moisture content ω 0.
Cement Cold Regeneration Technology mixture maximum dry density, optimum moisture content are shown in Table 14.
The different cement mixing content cold regeneration mix maximum dry densities of table 14, optimum moisture content
It is 3.0%, 3.5%, 4.0% and 4.5% to choose cement dose, and VVTM is made respectively according to different cement doses
Test specimen；
Measure each group cement consumption test specimen carry out 7d unconfined compression strength tests and 7d cleavage strengths experiment, in conjunction with table 1,
2 technology of table requires and engineering experience, comprehensive to determine cement dose；
Test specimen is prepared using VVTM and carries out Standard Curing (20 ± 2 DEG C of temperature, 95% or more humidity) 6d, 20 ± 2 DEG C full
For 24 hours, next day carries out unconfined compression strength test, different cement dose VVTM to water
Test specimen cold regeneration mix 7d unconfined compressive strengths the results are shown in Table 15, table 16.It can by result in table 15, table 16
Know, the Cement Cold Regeneration Technology mixture that cement dose is 3.5% can meet design requirement, it was demonstrated that suggest cement dose range herein
It can be for reference.
The different cement dose cold regeneration mix VVTM test specimen 7d unconfined compressive strengths of table 15
The different cement dose cold regeneration mix VVTM test specimen 7d cleavage strengths of table 16
Embodiment 3
Select Portland cement, coarse aggregate, fine aggregate, RCB.Its technological property test result meets above-mentioned requirements.
Old pavement base milling thickness hx=12cm, Cement Cold Regeneration Technology structure sheaf design thickness HR=18cm.According to formula
(2), it can be calculated the new volume coefficient Y that gathers materials：
Y=0.875HR/hx=0.875 × 18/12=1.31
Determine that thickness is gathered materials volume
(Y-1)/Y × 100=41% >=35%
Therefore, coarse aggregate volume C=(Y-1) × 100-20=21%, fine aggregate volume X=20%.
Determine Cement Cold Regeneration Technology mixture gradation
Cement Cold Regeneration Technology mixture gradation is：
RCB：Coarse aggregate：Fine aggregate=100-C-X：C：X=59:21:20
Cement Cold Regeneration Technology mixture formate gradation composition is shown in Table 17 after synthesis.
17 Cement Cold Regeneration Technology mixture formate gradation composition of table
| Sieve pore (mm) | 37.5 | 31.5 | 26.5 | 19 | 9.5 | 4.75 | 2.36 | 0.6 | 0.075 |
| Pass through percentage (%) | 100 | 98.4 | 97.0 | 69.4 | 52.3 | 43.3 | 29.4 | 13.2 | 3.7 |
It is 3.0%, 3.5%, 4.0% and 4.5% to choose cement dose, and mixture is determined using vertical vibration compacting process
Optimum moisture content and maximum dry density, test parameters preferably include：Working frequency 30Hz, quiet eccentric moment 7.6kN, upper car weight
Measure 1.2kN, weight of getting off 1.8kN, vibration compaction test time 110s.
(1) 5 parts of dry mass m are prepared by formate gradation composition requirementsFor the sample of 5500g；
(2) it is (m to take 1 part of sample of drying, addition predetermined qualityj+ms) × water, uniform mixing；Then, corresponding water is added
Mud, again uniform mixing obtain wet mixture.Wherein, wiMoisture content in cement is added when being tested for ith, is the experiment
When be added cement quality, 1,2,3,4,5；
(3) test specimen is prepared using simulation research on vibrating compaction test method；
(4) water content and density are mixed and stirred according to 5 groups, draws density-water content relation curve, hump shape hump is indulged
Abscissa is respectively maximal density ρmaxWith optimum moisture content ω0。
Cement Cold Regeneration Technology mixture maximum dry density, optimum moisture content are shown in Table 18.
The different cement mixing content cold regeneration mix maximum dry densities of table 18, optimum moisture content
It is 3.0%, 3.5%, 4.0% and 4.5% to choose cement dose, and VVTM is made respectively according to different cement doses
Test specimen；
Measure each group cement consumption test specimen carry out 7d unconfined compression strength tests and 7d cleavage strengths experiment, in conjunction with table 1,
2 technology of table requires and engineering experience, comprehensive to determine cement dose；
Test specimen is prepared using VVTM and carries out Standard Curing (20 ± 2 DEG C of temperature, 95% or more humidity) 6d, 20 ± 2 DEG C full
For 24 hours, next day carries out unconfined compression strength test to water, and different cement dose VVTM test specimen cold regeneration mix 7d are without lateral spacing resistance to compression
Intensity results are shown in Table 19, table 20.By result in table 19, table 20 it is found that the Cement Cold Regeneration Technology mixture that cement dose is 3.5% is
Design requirement can be met, it was demonstrated that suggest that cement dose range can be for reference herein.
The different cement dose cold regeneration mix VVTM test specimen 7d unconfined compressive strengths of table 19
The different cement dose cold regeneration mix VVTM test specimen 7d cleavage strengths of table 20
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of Cement Cold Regeneration Technology mixture VVTM design methods, include the following steps：
(1) according to offer Cement Cold Regeneration Technology mixture shown in formula (1) formula：
RCB：Coarse aggregate：Fine aggregate=100-C-X：C：X formulas (1),
In formula (1)：C- coarse aggregate quality volumes, %,
X- fine aggregate quality volumes, %；
Slightly, fine aggregate quality volume design method is as follows：
(a) when (Y-1)/Y × 100 >=35%, C=(Y-1)/Y × 100-20, X=20%；
(b) when 20%≤(Y-1)/Y × 100<When 35%, C=20%, X=(Y-1)/Y × 100-20；
(c) when (Y-1)/Y × 100<When 20%, C=(Y-1)/Y × 100, X=0%；
Wherein Y is the new volume coefficient that gathers materials,
Y=0.875HR/hxFormula (2),
In formula (2)：Y- newly gathers materials volume coefficient；
HRCold renewal structure sheaf design thickness, cm；
HxOld pavement base milling thickness, cm；
(2) mixture for preparing different cement doses, determines optimum moisture content and maximum dry density；
(3) different cement doses in the step (2) are calculated separately by compactness of subbase 98% or base roadbed 97% to mix
The dry density for closing material test specimen is molded different cement doses by the optimum moisture content that the dry density and the step (2) that calculate obtain
VVTM test specimens；
(4) the VVTM test specimens obtained the step (3) carry out Standard Curing, the 7d of the VVTM test specimens after testing standard health without
Confined compressive strength and 7d cleavage strengths, 7d unconfined compressive strengths and 7d cleavage strengths are independently calculated by formula (3)：
In formula (3)：R0.95The intensity typical value of fraction 95%, MPa, wherein the 7d unconfined compressive strength generations of fraction 95%
Tabular value is expressed as Rc0.95, the 7d cleavage strength typical values of fraction 95% are expressed as Ri0.95；
Test piece intensity average value, MPa, wherein test specimen 7d unconfined compressive strengths average value are expressed asTest specimen 7d splittings are strong
Degree average value is expressed as
The standard deviation of S- test piece intensities, MPa；
CvThe coefficient of variation of the coefficient of variation of test piece intensity, %, wherein test specimen 7d unconfined compressive strengths is expressed as Cv,c, test specimen
The coefficient of variation of 7d cleavage strengths is expressed as Cv,i；
It is required according to cement dose shown in strength criterion shown in table 1 and table 2, determines cement dose；If acquired results cannot reach
The strength criterion, readjusts cement dose or the new volume that gathers materials is designed；
1 Cement Cold Regeneration Technology mixture strength design standard of table
2 Cement Cold Regeneration Technology mixture cement dose design standard of table
2. design method according to claim 1, which is characterized in that in the step (1) grain size of coarse aggregate be 15~
30mm or 10~25mm, grain size≤2.36mm of fine aggregate.
3. design method according to claim 1, which is characterized in that the step (2) includes：By base's cement additive
Amount is 3~4.5%, underlayment cement additive amount 2.5~4%, and cement dose is arranged for interval with 0.5%, prepares different water
The mixture of mud dosage, variation moisture content carry out simulation research on vibrating compaction test, and when obtaining maximum dry density, the moisture content of mixture is
Optimum moisture content.
4. design method according to claim 3, which is characterized in that the simulation research on vibrating compaction test parameter includes：Work frequency
Rate 30 ± 1Hz, quiet 7.6 ± 0.02kN of eccentric moment, 1.2 ± 0.01kN of weight of getting on the bus, 1.8 ± 0.01kN of weight of getting off, vibration
It is 110 ± 10s between hitting in real time.
5. design method according to claim 1, which is characterized in that be shaped in the step (3)：Using vertical vibration
The VVTM test specimens of compaction moulding difference cement dose, the parameter that the vertical vibration is compacted include：Working frequency 30 ± 1Hz, it is quiet
7.6 ± 0.02kN of eccentric moment, 1.2 ± 0.01kN of weight of getting on the bus, 1.8 ± 0.01kN of weight of getting off.
6. design method according to claim 1 or 5, which is characterized in that VVTM test specimens are cylinder in the step (3)
The height of body, a diameter of 150mm of the cylinder, the cylinder is 150mm.
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| KR100960665B1 (en) * | 2010-01-26 | 2010-06-07 | 제주산업(주) | Cold recyling asphalt concrete mixture using industrial byproduct as filling material and method manufacturing thereof |
| CN102765902A (en) * | 2012-08-07 | 2012-11-07 | 江苏省交通科学研究院股份有限公司 | Preparation method of emulsified asphalt cold recycling asphalt mixture |
| CN104402316A (en) * | 2014-11-02 | 2015-03-11 | 长安大学 | Emulsified asphalt cold recycled mixture mixing ratio design method |
| CN104652230A (en) * | 2014-12-25 | 2015-05-27 | 长安大学 | Adjusting method for gradation of cold-recycling mixture before and after compacting |
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