CN111222249A - Design method of material mixing ratio for rapidly repairing road surface at normal temperature - Google Patents
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- 239000000203 mixture Substances 0.000 claims abstract description 118
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 40
- 239000011707 mineral Substances 0.000 claims abstract description 40
- 239000004575 stone Substances 0.000 claims description 7
- 239000011800 void material Substances 0.000 claims description 6
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- 239000010426 asphalt Substances 0.000 abstract description 36
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- 238000005056 compaction Methods 0.000 description 5
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- 230000008859 change Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 3
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- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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Abstract
The invention belongs to the technical field of pavement repair material design, and particularly relates to a design method of a material mixing ratio for rapidly repairing a pavement at normal temperature. The invention provides a method for determining asphalt-aggregate ratio of asphalt mixture based on the closest embedded and extruded state of aggregate, which is derived from the discovery by an inventor that the dry density, the mineral aggregate clearance ratio VMA and the coarse aggregate clearance ratio VCA of the asphalt mixture have good correlation with the asphalt-aggregate ratio, the dry density is increased firstly and then reduced along with the increase of the asphalt-aggregate ratio, meanwhile, the VMA and the VCA are decreased firstly and then increased, the asphalt-aggregate ratio corresponding to a curve extreme value can be obtained by using the unique characteristic of the curve extreme value of a quadratic through regression analysis of the quadratic curve, and the mixture under the asphalt-aggregate ratio corresponds to the closest embedded and extruded state of the aggregate. The invention designs the mixing proportion of the asphalt mixture with different grades, takes the closest embedding and extruding state of aggregates in the mixture as the design standard, and determines that the mixture with the optimal oilstone ratio state has the optimal use performance.
Description
Technical Field
The invention belongs to the technical field of pavement repair material design, and particularly relates to a design method of a material mixing ratio for rapidly repairing a pavement at normal temperature.
Background
The design method of the mix proportion of the repair materials used by the common pavement is not reasonable due to the fact that the oilstone ratio is determined because compactness is blindly pursued, and therefore the repair effect or the pressure bearing effect of the repair materials is affected.
In the text of 'research on the mix proportion design method of the high-grade asphalt pavement rapid repair material' published by Huangqi university report of Zhengzhou, the preparation principle of the rapid repair material is analyzed in detail through a large number of indoor tests, a mix proportion design method and steps of the rapid repair material are provided, the rapid repair material which can meet the requirements of both the eastern road looseness and the compactness is prepared, and meanwhile, the sample analysis is carried out on the mix proportion design of the rapid repair material for the purpose of verifying the rationality of the method. The results show that: to prepare a reasonable quick repair material, a proper mineral aggregate grade proportion and mineral powder mixing amount are selected, the mixing amount of diesel oil in asphalt liquid is reduced as much as possible, and the SBS content in the quick repair material is properly increased.
The article only mentions the importance of selecting a proper mineral aggregate grade ratio and a proper amount of the mineral aggregate powder in the rapid repair material, and does not provide a reasonable formula for all the raw material ratios.
Therefore, the inventor of the present invention has conducted a great deal of research, and considers that the change rule of the compact state of the mixture under different oilstone ratios can be accurately evaluated by using the indexes such as the mineral aggregate gap rate of the mixture, the coarse aggregate gap rate or the dry density of the mixture, and the like, and the tightest state of the mixture can be finally obtained, and the corresponding optimal oilstone ratio of the mixture can be obtained.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for determining the optimal asphalt-stone ratio of an asphalt mixture based on the closest embedded and extruded state, namely a method for designing the mix proportion of materials used for quickly repairing a road surface at normal temperature; the design method is scientific and reasonable and has strong reliability.
The invention provides a method for determining asphalt-aggregate ratio of an asphalt mixture based on the closest embedding and squeezing state of aggregates. The inventor finds that the dry density, the mineral aggregate clearance rate VMA and the coarse aggregate clearance rate VCA of the asphalt mixture have good correlation with the oilstone ratio, the dry density is increased and then reduced along with the increase of the oilstone ratio, meanwhile, the VMA and the VCA are decreased and then increased, the oilstone ratio corresponding to a curve extreme value point can be obtained by using the unique characteristic of the quadratic curve extreme value through quadratic curve regression analysis, and the mixture corresponds to the closest state of mutual embedding and squeezing between aggregates under the oilstone ratio. By the method, the mix proportion design is carried out on the asphalt mixture with different gradation, the difference between the method and the prior mix proportion design method is explained, and the unreasonable oilstone ratio determination caused by blind pursuit of compactness is avoided because the method takes the condition that aggregates in the mixture reach the closest embedding and squeezing state as the design standard.
The invention provides a design method of a material mixing proportion for quickly repairing a road surface at normal temperature, which comprises the following steps:
the void ratio of the mineral aggregate is increased,
in formula 1: gm: bulk density of the mix;
Gm,s: gross bulk density of all mineral aggregates in the mixture;
ω0: the oil-stone ratio in the mixture.
The void ratio of the coarse aggregate and the mineral aggregate,
in formula 2: gb,ca: bulk density of coarse aggregate in the mixture;
P'ca: weight percent of coarse aggregate in the mineral aggregate.
The dry density of the mineral aggregate of the mixture,
ACopt＝average(ACG,ACVCA,ACVMA) Formula 4
In formula 4: ACoptThe optimal oilstone ratio of the mixture in the most compact state is obtained;
ACG,ACVCA,ACVMAthe oilstone ratios are respectively corresponding to the maximum dry density of the mixture, the minimum clearance rate of the coarse aggregate and the mineral aggregate of the mixture and the minimum clearance of the mixture.
The proportion of the raw materials determined by the design method improves the high-temperature performance of the mixture by 20-30%.
The principle and the idea of the invention are as follows:
in the technical specification of highway asphalt pavement construction JTGF40-2004, corresponding grading ranges are given to hot-mixed asphalt and cold-mixed materials, and the long standing time, good workability and guaranteed strength are considered when the mix proportion of the storable normal-temperature modified asphalt mixture is designed, so the mix proportion design adopts an SMC (sheet molding compound) discontinuous grading design method, the design method comprises 3 control points to adjust the composite grading of the mixture, namely the nominal maximum grain diameter, 4.75mm and 0.075mm of the mixture grading, calculating the a and b coefficients of a coarse aggregate grading curve according to the nominal maximum grain diameter passing rate and the 4.75mm passing rate of the mixture grading, constructing the coarse aggregate grading curve, calculating the a and b coefficients of a fine grading curve according to the 4.75mm passing rate and the 0.075mm passing rate, constructing the fine aggregate grading curve, calculating the passing rates of sieve pores according to the coarse and fine curves, and finally, finishing the mixture gradation design. A power function mathematical model is adopted when a thickness curve is constructed, and a formula is shown as a formula (1).
y＝axb(1)
In the formula: y-passage (%); x-aggregate particle size (mm); a. b- -regression coefficients.
The construction is carried out by adopting a power function model, and the passing rate of each sieve pore of the SMC-13C and SMC-20C storable normal-temperature modified asphalt mixture is shown in tables 1 and 2.
TABLE 1 SMC-13C storable type Normal temperature modified asphalt mixture sieve mesh passing rate
Note: the upper and lower limit passage rates are the deviation of the calculated passage rate in the table, 4.75mm to 16mm + -4, 0.15mm-4.75mm + -3, 0.075mm + -1.
TABLE 2 SMC-20C storable type Normal temperature modified asphalt mixture each sieve pore passing rate
Note: the upper and lower limit passage rates are the deviation of the calculated passage rate in the table, 4.75mm to 26.5mm + -5, 0.15mm-4.75mm + -4, 0.075mm + -2.
The method has the advantages that the method is based on the principle and the steps of the optimal asphalt mixture oilstone ratio determining method in the closest-embedding-extrusion state, relevant experimental research is carried out around the main influence factors of the method, and the difference of the optimal oilstone ratio of the mixture with the same gradation is determined by comparing the asphalt mixture closest-embedding-extrusion oilstone ratio determining method with the Marshall method and the like; finally, the use performance of the asphalt mixture determined by the method is compared and analyzed, and the result shows that the mixture in the optimal oilstone ratio state determined by the method has the optimal use performance.
Theoretical analysis, experimental analysis and performance comparison of the system prove that the method for determining the optimal asphalt-stone ratio of the asphalt mixture based on the closest embedded and extruded state is scientific and reliable. The method designs the asphalt mixture mixing ratio to have excellent high-temperature service performance, and simultaneously, because the method does not preset fixed design porosity for any gradation, the design process is also a gradation rationality judgment process, and engineering technicians can be helped to select more reasonable gradation according to the concrete condition of stones used in a project.
Detailed Description
In order to further illustrate the present invention so that those skilled in the art may better understand the present invention, the present inventors shall go through the following detailed description of the invention without limiting the invention thereto.
Example 1
For any mineral aggregate gradation, at a certain fixed compaction state, the frame structure of the mixture becomes more and more compact as asphalt is blended due to the lubrication and filling of the asphalt. With the further addition of asphalt, the increase of free asphalt in the mixture causes the frame structure of the mixture to be gradually expanded. The state of the mix frame structure before it is expanded is then called the tightest state.
For a mixture of a certain fixed gradation, the gross bulk density of the coarse aggregate, the gross bulk density of the mineral aggregate and the proportion of the coarse aggregate are relatively fixed, so that these parameters can be considered as constants when calculating the VMA, VCA and dry density of the mixture.
Thus, these three parameters are all functions of bulk density and oil-to-stone ratio of the mix, and are unique. I.e. the three parameters are closely related. The advantages of this method are: the oilstone ratio of the asphalt mixture is more reasonable and accurate; the method specially determines the asphalt-aggregate ratio of the mixture aiming at the rutting resistance index of the asphalt mixture, and the high-temperature performance index of the mixture is improved by 20-30 percent; other performance criteria are also improved due to the tightest state of the asphalt mixture.
For a mixture with fixed mineral aggregate and gradation, under the action of a certain standard compaction work (such as Marshall compaction for 75 times/surface or 100 times of rotary rolling), the mixture exists only in the tightest state during the process of continuously changing the oilstone ratio. Namely, when the oilstone ratio of the mixture is small, an arrangement state exists among mineral aggregates in the mixture, as the oilstone ratio is gradually increased, the lubricating effect of asphalt among the mineral aggregates is gradually increased, so that the arrangement state among the mineral aggregates is more and more compact, and a most compact state appears, but as the asphalt is further added, the free asphalt in the mineral aggregates is more, so that the compact state among the mineral aggregates is gradually expanded. The research considers that when the state before the mineral aggregate structure is expanded is the closest state of the mixture, the corresponding oilstone ratio is the optimal oilstone ratio in the closest state of the mixture.
According to researches, the change rule of the compact state of the mixture under different oilstone ratios can be accurately evaluated by adopting indexes such as the mineral aggregate gap rate of the mixture, the coarse aggregate gap rate or the dry density of the mixture, and the like, and the tightest state of the mixture is finally obtained, so that the corresponding optimal oilstone ratio of the mixture is obtained.
The specific expression forms of the three parameters are as follows:
the void ratio of the mineral aggregate is increased,
in the formula: gm: bulk density of the mix;
Gm,s: gross bulk density of all mineral aggregates in the mixture;
ω0: the oil-stone ratio in the mixture.
The void ratio of the coarse aggregate and the mineral aggregate,
in the formula: gb,ca: bulk density of coarse aggregate in the mixture;
P'ca: weight percent of coarse aggregate in the mineral aggregate.
The dry density of the mineral aggregate of the mixture,
for a certain fixed-gradation mixture, the gross bulk density G of the coarse aggregateb,caBulk density G of mineral aggregatem,sAnd weight percentage P 'of coarse aggregate in the mineral aggregate'caAre relatively fixed and therefore can be considered as constants when calculating the three parameters of VMA, VCA and aggregate dry density (dry density for short). Thus, the three parameters are the bulk density G of the mixmAnd oilstone ratio omega0Is unique. I.e. the three parameters are closely related. As can be seen from the calculation formula, VMA and VCA are positively correlated, but inversely correlated with dry density.
Experiments show that the mineral aggregate gap rate, the coarse aggregate gap rate and the change rule of the dry density along with the oilstone ratio of the asphalt mixture can be effectively regressed and analyzed by adopting a quadratic curve model. Therefore, a quadratic curve function is selected to fit the correlation between each volume index and the oilstone ratio, and the method is mainly characterized in that: (1) the quadratic curve has the characteristic of unique extreme value, and the physical meaning of the extreme value point is clear; (2) through repeated attempts, the correlation coefficient of the quadratic curve fitting is generally proved to be high. According to the extreme value characteristic of the quadratic curve, the minimum value of the mineral aggregate clearance rate of the mixture and the coarse aggregate clearance rate and the maximum value of the dry density of the mixture can be obtained. The physical significance of these minimum and maximum values is the closest state of the mix under such compaction conditions, from which the optimum oilstone ratio of the mix is determined. Theoretically, the mixture oilstone ratios corresponding to the three extreme values should be completely equal, but in the test process, due to test errors, certain errors may exist in the oilstone ratios corresponding to the three extreme values. For this purpose, the average of these three oilstone ratios is used as the optimum oilstone ratio of the blend in the tightest state, see equation (3-4).
ACopt＝average(ACG,ACVCA,ACVMA) (formula 4)
In the formula: ACoptThe optimal oilstone ratio of the mixture in the most compact state is obtained;
ACG,ACVCA,ACVMAthe oilstone ratios are respectively corresponding to the maximum dry density of the mixture, the minimum clearance rate of the coarse aggregate and the mineral aggregate of the mixture and the minimum clearance of the mixture.
It should be noted that in order to obtain a reliable test curve, at least 5 different oilstone ratios should be used in the test of the present invention to analyze the change law of the oilstone ratio with respect to the dry density of the mix, VCA and VMA.
For a given gradation of asphalt mix, under specific compaction work conditions, the optimum oilstone ratio of the mix can be determined by the above method, and the aggregate in the mix is at the most densely packed state.
Example 2
The mix proportion design method is optimized on a mineral aggregate grading design method of SAC and other coarse aggregate grading of Shaqinglin academy, and further reduces the mixture grading control range and improves the construction technical requirements within the grading control range of road asphalt pavement construction technical specification JTGF40-2004 by taking the design concept of US Superpavements as a reference.
TABLE 3 SMC-13 storable room temperature modified asphalt mixture mix proportion volume parameter test results
TABLE 4 SMC-20 storable room temperature modified asphalt mixture mix proportion volume parameter test results
TABLE 5 storable Normal temperature modified asphalt mixture Performance results
| Mix type | Degree of dynamic stability (times/mm) | Residual stability (%) | Freeze-thaw cleavage (%) |
| SMC-13 | 1231 | 81.1 | 76.0 |
| SMC-20 | 1389 | 80.6 | 75.6 |
| Specification requirements | 800 | 80 | 75 |
Claims (2)
1. A design method for the mix proportion of materials used for rapidly repairing a road surface at normal temperature is characterized in that the optimal mix proportion formula of the raw materials is as follows:
the void ratio of the mineral aggregate is increased,
in formula 1: gm: bulk density of the mix;
Gm,s: gross bulk density of all mineral aggregates in the mixture;
ω0: the oil-stone ratio in the mixture;
the void ratio of the coarse aggregate and the mineral aggregate,
in formula 2: gb,ca: bulk density of coarse aggregate in the mixture;
P′ca: weight percent of coarse aggregate in the mineral aggregate;
the dry density of the mineral aggregate of the mixture,
ACopt＝average(ACG,ACVCA,ACVMA) Formula 4
In formula 4: ACoptThe optimal oilstone ratio of the mixture in the most compact state is obtained;
ACG,ACVCA,ACVMAthe oilstone ratios are respectively corresponding to the maximum dry density of the mixture, the minimum clearance rate of the coarse aggregate and the mineral aggregate of the mixture and the minimum clearance of the mixture.
2. The method for designing the mix proportion of the materials for rapidly repairing the road surface at the normal temperature according to claim 1, wherein the mix proportion determined by the design method improves the high-temperature performance of the mixture by 20-30%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114878454A (en) * | 2022-04-14 | 2022-08-09 | 中交第一公路勘察设计研究院有限公司 | Optimization method of indoor vibration compaction test curve of cement stabilized macadam |
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| CN101746995A (en) * | 2008-12-17 | 2010-06-23 | 交通部公路科学研究院 | Bituminous mixture proportion design method based on tightest state |
| CN102503243A (en) * | 2011-10-15 | 2012-06-20 | 交通运输部公路科学研究所 | Method for determining mineral aggregate gradation by using three control points hyperbolic structure |
| CN103526664A (en) * | 2013-10-30 | 2014-01-22 | 江苏宝利沥青股份有限公司 | Determining method suitable for mix proportion of asphalt mixture of heavy traffic road surfaces |
| CN104372727A (en) * | 2014-11-07 | 2015-02-25 | 交通运输部科学研究院 | Mix proportion design method for constant-temperature modified asphalt mixture |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101746995A (en) * | 2008-12-17 | 2010-06-23 | 交通部公路科学研究院 | Bituminous mixture proportion design method based on tightest state |
| CN102503243A (en) * | 2011-10-15 | 2012-06-20 | 交通运输部公路科学研究所 | Method for determining mineral aggregate gradation by using three control points hyperbolic structure |
| US20140257742A1 (en) * | 2011-10-15 | 2014-09-11 | Research Institute Of Highway, Mot, Prc | Method to structure mineral aggregate gradation by using three control points and two curves |
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| CN104372727A (en) * | 2014-11-07 | 2015-02-25 | 交通运输部科学研究院 | Mix proportion design method for constant-temperature modified asphalt mixture |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114878454A (en) * | 2022-04-14 | 2022-08-09 | 中交第一公路勘察设计研究院有限公司 | Optimization method of indoor vibration compaction test curve of cement stabilized macadam |
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