CN113636805A - Preparation method of normal-temperature mixing type emulsified asphalt mixture - Google Patents
Preparation method of normal-temperature mixing type emulsified asphalt mixture Download PDFInfo
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- CN113636805A CN113636805A CN202110786006.6A CN202110786006A CN113636805A CN 113636805 A CN113636805 A CN 113636805A CN 202110786006 A CN202110786006 A CN 202110786006A CN 113636805 A CN113636805 A CN 113636805A
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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 invention provides a preparation method of a normal-temperature mixing type emulsified asphalt mixture, which comprises the following specific steps: s1, determining the engineering design grading range according to the sieve pores and the type of the asphalt mixture; s2, selecting raw materials; s3, designing grading; s4, determining the optimal water content: determining the optimal water content through a correction geotechnical test; s5, forming and curing: mixing the raw materials at all levels, compacting the two surfaces of the mixture for 50 times respectively, then compacting the two surfaces of the mixture for 25 times respectively immediately after curing the mixture for 2 days at 90 ℃ in a die, and standing the mixture for 24 hours at 20 +/-5 ℃ for demoulding; s6: determining the optimal emulsified asphalt dosage; s7, detection performance: measuring the relative density of the bulk, the maximum theoretical relative density, the splitting strength and the void ratio; and S8, completing the design of the mixing proportion when the performance indexes all meet the requirements, and if the performance indexes do not meet the requirements, redesigning the mixed material from S2 and repeating the steps from S2 to S7. The invention has good economic benefit, environmental protection benefit and social benefit.
Description
Technical Field
The invention relates to the technical field of road engineering, in particular to a preparation method of a normal-temperature mixing type emulsified asphalt mixture.
Background
The hot-mix asphalt mixture is the most main mixture type in the rural highway construction process at present, but at the present stage of strict environmental protection policy, the hot-mix asphalt mixture has certain defects in rural highway application, and the hot-mix asphalt mixture is mainly embodied in the following two aspects: firstly, the asphalt mixing station needs to consume a large amount of fuel for producing the mixture, and a large amount of smoke, waste gas and heat are discharged in the whole process from the mixing production to the paving of the asphalt mixture, so that the environmental pollution is large. Secondly, the rural highway can be constructed all the year round according to the requirements due to the characteristics of the rural highway. The conventional hot-mix asphalt mixture is greatly influenced by temperature, has poor construction effect at lower temperature, is difficult to ensure quality, and brings hidden danger to pavement quality. In order to promote the green development of roads and meet the construction requirements of rural roads, the asphalt mixture has the advantages of low energy consumption, less pollution, low cost and convenient construction, and is particularly important for being used in various links such as mixing, paving, rolling and forming.
Disclosure of Invention
The invention provides a design process of the mix proportion of a normal-temperature mixing type emulsified asphalt mixture, which aims to overcome the defects in the prior art and is used for the design of the target mix proportion of the emulsified asphalt mixture, so that the emulsified asphalt mixture has higher practicability.
In order to solve the technical problems, the invention adopts the technical scheme that: a preparation method of a normal-temperature mixing type emulsified asphalt mixture is suitable for the normal-temperature mixing type emulsified asphalt mixture and is characterized by comprising the following specific steps of determining an engineering grading range, selecting raw materials, designing the grading, determining the optimal water content, forming, preserving health, determining the dosage of an emulsion and detecting performance:
s1, determining the engineering design grading range according to the sieve pores and the type of the asphalt mixture;
s2, selecting raw materials: the raw materials comprise emulsified asphalt for cold mixing, water, coarse aggregate, fine aggregate, mineral powder and cement, and are selected according to technical indexes;
s3, design grading: selecting raw materials according to the grading range to design the grading;
s4, determining the optimal water content: drawing a curve of the water content and the dry density to determine the optimal water content by correcting the geotechnical test;
s5, forming and curing: mixing the raw materials obtained in S3, compacting the two surfaces of the mixture 50 times respectively, then compacting the two surfaces of the mixture 25 times respectively immediately after curing the mixture for 2 days at 90 ℃ in a die, and standing the mixture for 24 hours at 20 +/-5 ℃ for demoulding;
s6: determining the optimal emulsified asphalt dosage: determining the optimal emulsified asphalt dosage according to the void ratio and the stability in the molding and curing process in S5;
s7, detection performance: carrying out Marshall test, splitting test at 15 ℃ and splitting test for 24h by soaking in water, and determining bulk volume relative density, maximum theoretical relative density, splitting strength and void ratio;
when all performance indexes in S8 and S7 meet the requirements, completing mix proportion design, if the performance indexes do not meet the requirements, redesigning the mixture from S2, changing the composition of the materials or changing the gradation, repeating S2 to S7 until the requirements are met, and completing the design of the normal-temperature mixing type emulsified asphalt mixture;
the asphalt mixture in the S1 is CB-20 or CB-13;
in S2, limestone is selected as coarse aggregate, the crushing value of the limestone is not more than 20%, the abrasion loss of los Angeles is not more than 24%, and the gross volume relative density is 2.7g/cm3The content of needle flake particles is not more than 12 percent, and the water absorption rate is not more than 3 percent;
limestone is selected as fine aggregate, and the relative density of the gross volume of limestone is not less than 2.5g/cm3The sand equivalent is not less than 60%, the firmness is not less than 12%, and the mud content is not more than 5%;
the mineral powder is limestone mineral powder, and the relative density of the volume of the crude ore is not less than 2.5g/cm3The hydrophilic coefficient is less than 1, the water content is not more than 1, and no aggregates are agglomerated;
the cement is 42.5-grade ordinary portland cement, the water consumption of the standard consistency is 28.2 percent, the breaking strength is 5.9MPa, the compressive strength is 28.9MPa, and the cement is dry, pollution-free and caking-free;
the porosity in S6 is between 6% and 9%, and the dynamic stability is not less than 2000 times/mm;
in S8, the void ratio of the normal temperature mixing emulsified asphalt mixture is between 6% and 9%, the Marshall stability is not less than 1kN, the cleavage strength at 15 ℃ is not less than 0.6MPa, the ratio of the residual strength after the freeze-thaw cleavage test is not less than 75%, the dynamic stability is not less than 2000 times/mm, and the breaking strain after the trabecular bending test is not less than 2000 mu epsilon.
Further, the coarse aggregates in the S2 comprise a material No. 1, a material No. 2 and a material No. 3, and the particle sizes of the coarse aggregates are respectively 9.5-19mm, 4.75-9.5mm and 2.36-4.75 mm; the fine aggregate is 4# material, and the grain diameter is 0-2.36 mm.
Further, the aggregate proportion of each grade is 1# material: 2# material: 3# Material: 4# Material: mineral powder: cement 31:25: 10: 33:0.5:0.5.
Further, in the step S4, the optimal moisture content is determined according to the method of the current highway geotechnical test regulation (JTG E40-2207) T0131, the pre-water addition amount is 7.5%, 8.5%, 9.5%, 10.5% and 11.5% respectively in the pre-asphalt test oilstone ratio of 4.3%, and the optimal moisture content is determined by drawing a moisture content curve and a dry density curve according to the variation range of 1.0%.
Compared with the prior art, the invention has the beneficial effects that: compared with the conventional cold-recycling emulsified asphalt mixture and the traditional hot-mixing asphalt mixture, the asphalt pavement structure of the rural highway adopts the normal-temperature mixing emulsified asphalt mixture, the volume index and the mechanical index of the pavement structure can reach the technical requirements, the pavement performance of the mixture in the design flow of the mixing ratio is better, the service life of the rural highway is prolonged, the problem of high energy consumption and heavy pollution of the hot-mixing asphalt mixture is avoided, and the pavement structure has good economic benefit, environmental protection benefit and social benefit.
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The disclosure of the present invention is illustrated with reference to the accompanying drawings. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention. In the drawings, like reference numerals are used to refer to like parts. Wherein:
FIG. 1 is a schematic flow diagram of a preparation method of a normal-temperature mixing type emulsified asphalt mixture;
FIG. 2 shows the results of the compaction test.
Detailed Description
It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.
An embodiment according to the present invention is shown in connection with fig. 1. A preparation method of a normal-temperature mixing type emulsified asphalt mixture is suitable for the normal-temperature mixing type emulsified asphalt mixture and is characterized by comprising the following specific steps of determining an engineering grading range, selecting raw materials, designing the grading, determining the optimal water content, forming, preserving health, determining the dosage of an emulsion and detecting performance:
s1, determining the engineering design grading range according to the sieve pores and the type of the asphalt mixture;
the asphalt mixture is CB-20 or CB-13, the grading range is designed according to a sieve pore decision program, and the requirements of the mineral aggregate synthetic grading design range are shown in Table 1:
TABLE 1 gradation range of normal temperature mixing emulsified asphalt mixture
| Screen hole (mm) | CB-20 grading Range | CB-13 grading Range |
| 26.5 | 100 | — |
| 19 | 90～100 | — |
| 16 | 70～92 | 100 |
| 13.2 | 60～85 | 90～100 |
| 9.5 | 50～75 | 66～82 |
| 4.75 | 33～60 | 41～71 |
| 2.36 | 20～45 | 24～54 |
| 1.18 | 12～33 | 15～40 |
| 0.6 | 10～26 | 10～28 |
| 0.3 | 6～20 | 6～24 |
| 0.15 | 4～15 | 4～16 |
| 0.075 | 3～10 | 2～9 |
S2, selecting raw materials: the raw materials comprise emulsified asphalt for cold mixing, water, coarse aggregate, fine aggregate, mineral powder and cement, and are selected according to technical indexes;
limestone is adopted as both the coarse aggregate and the fine aggregate, the coarse aggregate comprises a No. 1 material, a No. 2 material and a No. 3 material, and the grain sizes of the coarse aggregate and the No. 3 material are respectively 9.5-19mm, 4.75-9.5mm and 2.36-4.75 mm; the fine aggregate is 4# material, the grain diameter is 0-2.36mm, the technical index requirements of the coarse aggregate and the fine aggregate are shown in the following tables 2 and 3:
TABLE 2 technical index requirements for coarse aggregates
TABLE 3 specification requirements for fine aggregates
| Test items | Unit of | Test results |
| Bulk relative density | g/cm3 | 2.702 |
| Sand equivalent | ％ | 68 |
| Firmness (>0.3mm part) | ％ | 19 |
| Content of mud (C)<0.075mm content) | ％ | 2.5 |
The mineral powder is limestone mineral powder, and the technical index requirements are shown in the following table 4:
TABLE 4 technical index requirements of mineral powder
| Test items | Unit of | Test results |
| Bulk relative density | g/cm3 | ≥2.5 |
| Coefficient of hydrophilicity | <1 | |
| Water content | ％ | ≤1 |
| Appearance of the product | / | Agglomeration without aggregates |
The technical index requirements of ordinary Portland cement with 42.5-grade cement are shown in the following table 5:
TABLE 5 technical index requirements of cements
S3, design grading: the raw materials are selected according to the grading range to design the grading, and the results of the raw material screening and the mineral aggregate synthesis grading design are respectively shown in tables 6 and 7:
TABLE 6 screening results for each grade
TABLE 7 mineral aggregate synthetic grading
| Screen hole (mm) | 26.5 | 19 | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Composition grading | 100 | 95 | 85 | 71 | 61 | 41 | 30 | 22.5 | 16 | 11 | 8.5 | 5 |
Wherein, the aggregate proportion of each grade is 1# material: 2# material: 3# Material: 4# Material: mineral powder: cement 31:25: 10: 33:0.5:0.5.
S4, determining the optimal water content: generally, in order to better coat the emulsified asphalt with stone and increase the workability of the emulsified asphalt mixture, a certain amount of water needs to be added during the mixing of the emulsified asphalt mixture. The 'road asphalt pavement regeneration technical specification' in China requires that a soil compaction test is adopted, and the optimal water content is determined through a dry density-water content curve.
In this test, the optimum water content was determined by referring to the method of the current "road soil test regulation" (JTG E40-2207) T0131, and the ratio of the asphalt to the pre-formed asphalt test oilstone was 4.3%, and the pre-formed amounts of water were 7.5%, 8.5%, 9.5%, 10.5%, and 11.5%, respectively, with a variation width of 1.0%. The compaction results are shown in FIG. 2.
As can be seen from the graph 2, the dry density of the normal-temperature mixing type emulsified asphalt mixture is firstly increased and then decreased along with the increase of the water content, and the test result shows that when the water content of the normal-temperature mixing type emulsified asphalt mixture is 9.6%, the dry density of the asphalt mixture is the maximum, namely 2.06g/cm3This indicates that the optimum water content of the normal-temperature mixing type emulsified asphalt mixture is 9.6%. And the external water mixing amount is determined by calculation according to the total water consumption, the aggregate water content and the emulsified asphalt water content.
S5, forming and curing: according to the composition of the mixture ratio shown in the table 8, test pieces are molded in such a manner and under such curing conditions that after the 1 st double faces are each compacted 50 times, curing is carried out in a mold at 90 ℃ for 2 days, the 2 nd double faces are each compacted 25 times immediately when the test pieces are hot, and the test pieces are left to stand at room temperature (20 +/-5 ℃) for 24 hours for demolding.
TABLE 8 composition (kg) of Normal temperature mixing emulsified asphalt mixture
S6: determining the optimal emulsified asphalt dosage: according to the initial test grading, when the indoor optimal water content is preliminarily determined to be 9.6% after the mixing, the overall state of the mixture meets the test requirements. Meanwhile, four groups of emulsified asphalts, 6.0%, 6.5%, 7.0%, and 7.5%, were designed for the Marshall test and the 15 ℃ cleavage test, respectively, and the results are shown in Table 9.
TABLE 9 test results
As can be seen from the above table, with the increase of the mixing amount of the emulsified asphalt, the void ratio of the cold-mixed cold-spread asphalt mixture is firstly reduced and then increased, the 15 ℃ splitting strength and the Marshall stability are firstly increased and then reduced, the overall trend of the bulk relative density is firstly increased and then reduced, and the maximum theoretical relative density is firstly increased and then gradually reduced. According to the data, when the mixing amount of the emulsified asphalt is 6.9%, the void ratio of the cold-mixed cold-laid asphalt mixture reaches the minimum value, the splitting strength at 15 ℃, the Marshall stability and the capillary volume relative density reach the maximum value, and the optimal mixing amount of the emulsified asphalt is 6.9% by comprehensively considering the test results
The road performance test of the normal-temperature mixing emulsified asphalt mixture is carried out according to test methods such as asphalt mixture splitting strength, freeze thawing, rutting, low-temperature bending and the like specified in road engineering asphalt and asphalt mixture test regulations (JTG E20-2011). The road performance matching ratios of the normal-temperature mixing type emulsified asphalt mixture prepared by the present example to the conventional cold-mix asphalt mixture and the hot-mix asphalt mixture are shown in table 10, in which the normal-temperature mixing type emulsified asphalt mixture is a component having an optimum emulsified asphalt mixing amount of 6.9% selected from the above test results, and both the cold-mix asphalt mixture and the hot-mix asphalt mixture are of the AC-20 type.
TABLE 10 comparison of road Performance test results
In summary, the invention provides a preparation method of a normal-temperature mixing type emulsified asphalt mixture, which comprises the following steps: raw material detection index technical requirements; designing the mineral aggregate gradation; determining the optimal water content; forming mode and health preserving condition; determining the optimal emulsified asphalt dosage; the technical requirements of the road performance indexes. Compared with the conventional cold-recycling emulsified asphalt mixture and the traditional hot-mix asphalt mixture, the asphalt pavement structure of the rural highway adopts a normal-temperature mixing type emulsified asphalt mixture, and the volume index and the mechanical index of the asphalt pavement can reach the technical requirements. Moreover, the mixture of the design process of the mixing proportion has better road performance, prolongs the service life of rural highways, avoids the problems of high energy consumption and heavy pollution of hot-mix asphalt mixtures, and has good economic benefit, environmental protection benefit and social benefit.
The technical scope of the present invention is not limited to the above description, and those skilled in the art can make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present invention, and such changes and modifications should fall within the protective scope of the present invention.
Claims (4)
1. A preparation method of a normal-temperature mixing type emulsified asphalt mixture is suitable for the normal-temperature mixing type emulsified asphalt mixture and is characterized by comprising the following specific steps of determining an engineering grading range, selecting raw materials, designing the grading, determining the optimal water content, forming, preserving health, determining the dosage of an emulsion and detecting performance:
s1, determining the engineering design grading range according to the sieve pores and the type of the asphalt mixture;
s2, selecting raw materials: the raw materials comprise emulsified asphalt for cold mixing, water, coarse aggregate, fine aggregate, mineral powder and cement, and are selected according to technical indexes;
s3, design grading: selecting raw materials according to the grading range to design the grading;
s4, determining the optimal water content: drawing a curve of the water content and the dry density to determine the optimal water content by correcting the geotechnical test;
s5, forming and curing: mixing the raw materials obtained in S3, compacting the two surfaces of the mixture 50 times respectively, then compacting the two surfaces of the mixture 25 times respectively immediately after curing the mixture for 2 days at 90 ℃ in a die, and standing the mixture for 24 hours at 20 +/-5 ℃ for demoulding;
s6: determining the optimal emulsified asphalt dosage: determining the optimal emulsified asphalt dosage according to the void ratio and the stability in the molding and curing process in S5;
s7, detection performance: carrying out Marshall test, splitting test at 15 ℃ and splitting test for 24h by soaking in water, and determining bulk volume relative density, maximum theoretical relative density, splitting strength and void ratio;
when all performance indexes in S8 and S7 meet the requirements, completing mix proportion design, if the performance indexes do not meet the requirements, redesigning the mixture from S2, changing the composition of the materials or changing the gradation, repeating S2 to S7 until the requirements are met, and completing the design of the normal-temperature mixing type emulsified asphalt mixture;
the asphalt mixture in the S1 is CB-20 or CB-13;
in S2, limestone is selected as coarse aggregate, the crushing value of the limestone is not more than 20%, the abrasion loss of los Angeles is not more than 24%, and the gross volume relative density is 2.7g/cm3The content of needle flake particles is not more than 12 percent, and the water absorption rate is not more than 3 percent;
limestone is selected as fine aggregate, and the relative density of the gross volume of limestone is not less than 2.5g/cm3The sand equivalent is not less than 60%, the firmness is not less than 12%, and the mud content is not more than 5%;
the mineral powder is limestone mineral powder, and the relative density of the volume of the crude ore is not less than 2.5g/cm3The hydrophilic coefficient is less than 1, the water content is not more than 1, and no aggregates are agglomerated;
the cement is 42.5-grade ordinary portland cement, the water consumption of the standard consistency is 28.2 percent, the breaking strength is 5.9MPa, the compressive strength is 28.9MPa, and the cement is dry, pollution-free and caking-free;
the porosity in S6 is between 6% and 9%, and the dynamic stability is not less than 2000 times/mm;
in S8, the void ratio of the normal temperature mixing emulsified asphalt mixture is between 6% and 9%, the Marshall stability is not less than 1kN, the cleavage strength at 15 ℃ is not less than 0.6MPa, the ratio of the residual strength after the freeze-thaw cleavage test is not less than 75%, the dynamic stability is not less than 2000 times/mm, and the breaking strain after the trabecular bending test is not less than 2000 mu epsilon.
2. The method for preparing an emulsified asphalt mixture according to claim 1, wherein the coarse aggregates in S2 include material # 1, material # 2 and material # 3, and the particle sizes thereof are 9.5-19mm, 4.75-9.5mm and 2.36-4.75mm, respectively; the fine aggregate is 4# material, and the grain diameter is 0-2.36 mm.
3. The method for preparing an emulsified asphalt mixture by stirring at normal temperature according to claim 2, wherein the aggregate proportions of the different grades are respectively 1# material: 2# material: 3# Material: 4# Material: mineral powder: cement 31:25: 10: 33:0.5:0.5.
4. The method for preparing an emulsified asphalt mixture to be mixed at normal temperature according to claim 1, wherein the optimal water content is determined in S4 by referring to the method of the current road soil engineering test regulation (JTG E40-2207) T0131, the ratio of the oilstone in the preliminary asphalt test is 4.3%, the pre-added water amounts are 7.5%, 8.5%, 9.5%, 10.5% and 11.5%, and the optimal water content is determined by plotting the water content and the dry density curve with the variation range of 1.0%.
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