CN113831081B - Asphalt/cement composite base normal-temperature self-compacting asphalt concrete and preparation method thereof - Google Patents
Asphalt/cement composite base normal-temperature self-compacting asphalt concrete and preparation method thereof Download PDFInfo
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- 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
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- 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
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Abstract
The invention discloses an asphalt/cement composite base normal temperature self-compacting asphalt concrete, which comprises the following components in parts by weight: 10 to 20 portions of emulsified asphalt, 4 to 12 portions of cement, 40 to 73 portions of aggregate, 12 to 23 portions of mineral powder, 1 to 3 portions of bonding agent and 1 to 5 portions of water. According to the invention, by optimizing the formula and the grading composition of the asphalt concrete, the obtained concrete can be mixed and paved at normal temperature, can realize self-compaction (rolling without a compaction machine) after paving, and has the advantages of high early strength and the like; and the related preparation and construction methods are simple, environment-friendly, low in energy consumption and suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of road building materials, and particularly relates to asphalt/cement composite-based normal-temperature self-compacting asphalt concrete and a preparation method thereof.
Background
The asphalt pavement pit is one of main disease types of the asphalt pavement, and diseases such as water damage, loosening, peeling, cracks and the like of the asphalt pavement can be evolved into the pit diseases of the asphalt pavement. The pits can cause the service level of the asphalt pavement to be remarkably reduced, and the driving comfort and the safety of the asphalt pavement are influenced. If the repair is not carried out in time, the diseases can develop rapidly under the combined action of traffic load and water, so that the maintenance cost is increased and the driving safety is seriously threatened. Because of the great potential safety hazard, the requirement that the pit and the groove are not over night is clearly put forward in the maintenance management of the highway. Therefore, the repair method has great significance for timely repairing the pits of the asphalt pavement.
The pouring type asphalt mixture Guss asphal is an asphalt mixture which is prepared by mixing at a high temperature (220-260 ℃) and needs to be added with a certain amount of lake asphalt to ensure the high-temperature performance, and is paved and formed without rolling by depending on the fluidity of the mixture, so that the asphalt mixture has high asphalt content, high mineral powder content and a void ratio of less than 1 percent. However, the temperature needs to be strictly controlled in the mixing, transporting and constructing processes, and the low temperature can cause poor compatibility of the mixture and higher initial investment. The cold-mixing cold-paving asphalt mixture is a novel asphalt mixture which is mixed and constructed at normal temperature, and is not required to heat and pave and roll mineral aggregates and asphalt at high temperature like hot-mixing and warm-mixing asphalt mixtures, so that the fuel consumption and the emission of harmful gases are greatly reduced, and the cold-mixing cold-paving asphalt mixture becomes a hot spot of research in the industry in recent years. The cold-mix asphalt mixture has lower requirements on production equipment, and has the outstanding advantages of energy conservation and emission reduction, convenient construction, improvement on construction conditions, suitability for various climates and the like. However, the wide application of the cold-mix cold-spread asphalt mixture also presents more problems: 1) The common cold recycled asphalt mixture aggregate part mainly comprises waste asphalt mixtures, the performance of the recycled asphalt mixture is influenced due to the excessively high mixing amount of the waste asphalt mixtures, and meanwhile, the unseparated waste asphalt mixtures and new aggregates are easy to have non-uniform mixing, so that the segregation of the mixture in the construction process is influenced, and the construction quality is influenced; 2) Compared with road petroleum asphalt, the emulsified asphalt has lower content of evaporation residue, and the wrapping property of aggregate and emulsified asphalt during mixing can not be compared favorably with that of hot-mix asphalt mixture, so that the conventional emulsified asphalt mixture has long life cycle and late open traffic; 3) After the conventional emulsified asphalt mixture is cured and molded, the porosity of the asphalt mixture is high, so that the water stability of the cold-mixed asphalt mixture is poor; 4) In the conventional emulsified asphalt mixture, whether the cold recycled asphalt mixture or the cold-mixed cold-laid asphalt mixture, under the economic pressure in recent years, the laying cost is one of the application limits of the cold-mixed asphalt mixture at present. The patent CN111705594A discloses a preparation method of a cold-mixed cold-laid asphalt mixture, which adopts the steps of mixing and stirring coarse aggregates, fine aggregates, modified emulsified asphalt, mineral fillers, water, matrix resin, a curing agent and other required liquid additives to form the cold-mixed cold-laid asphalt mixture, and carrying out water permeability test on the cold-mixed cold-laid asphalt mixture through a water permeability detection device to determine whether the water permeability of the cold-mixed cold-laid asphalt mixture meets the set requirement; patent CN 111718166A discloses a cold-mixed cold-paved asphalt mixture, a preparation method thereof and an asphalt pavement, wherein a proper amount of regenerated coarse and fine aggregates, new coarse and fine aggregates, emulsified asphalt, cement and an additive are mixed and paved; patent CN 111574128A discloses a foamed asphalt cold recycling mixture formula, which adopts a proper amount of mineral aggregate, water and foamed asphalt to mix. However, no effective solution is provided at present aiming at the problem that the technical performance, road performance and economic conditions of the related cold-mix asphalt mixture cannot reach the optimal state in all aspects.
Disclosure of Invention
The invention mainly aims to solve the problems and the defects in the prior art, and provides the asphalt/cement composite base normal-temperature self-compacting asphalt concrete.
In order to achieve the purpose, the invention adopts the technical scheme that:
an asphalt/cement composite base normal temperature self-compacting asphalt concrete comprises the following components in parts by weight: 10 to 20 portions of emulsified asphalt, 4 to 12 portions of cement, 40 to 73 portions of aggregate, 12 to 23 portions of mineral powder, 1 to 3 portions of bonding agent and 1 to 5 portions of water.
In the scheme, the emulsified asphalt is road mixing type cation emulsified asphalt or road mixing type cation modified emulsified asphalt.
In the scheme, the content of evaporation residue of the road mixing type cation emulsified asphalt is not less than 55 percent, the penetration of the evaporation residue at 25 ℃ is 45-150 dmm, and the ductility at 15 ℃ is not less than 40cm; the mixing type cation modified emulsified asphalt for roads has the content of evaporation residue not less than 60 percent, the penetration of the evaporation residue at 25 ℃ is 40-100 dmm, and the ductility at 5 ℃ is not less than 20cm.
Preferably, the emulsified asphalt is obtained by emulsifying SBR or SBS modified asphalt.
In the scheme, the cement is one or more of portland cement, aluminate cement and sulphoaluminate cement, the initial setting time is not less than 45min, and the final setting time is not more than 600min.
In the scheme, the aggregate is one or more of common aggregates for road engineering, such as basalt, limestone, diabase, steel slag aggregate and the like, and is divided into coarse aggregate and fine aggregate, wherein the particle size of the coarse aggregate is 5-15 mm, and the particle size of the fine aggregate is 0-5 mm.
In the scheme, the filler is limestone mineral powder, and the passing rate of the limestone mineral powder with the particle size of 0.075mm is more than 90%.
In the scheme, the bonding agent is anti-settling aluminate.
The organic bonding agent is added into the normal-temperature self-compacting asphalt concrete, so that the organic treatment can be performed on the cement, the agglomeration phenomenon of cement particles in the mixing stage is reduced, and the dispersibility is improved; on the other hand, the lipophilicity of the inorganic cement is improved, and the compatibility of the inorganic cement and asphalt is improved.
In the scheme, the asphalt/cement composite-based normal-temperature self-compacting asphalt concrete further comprises an external additive, and the dosage of the external additive accounts for less than 1% of the mass of the concrete.
In the above scheme, the admixture is at least one of a polycarboxylic acid water reducing agent, an early strength agent and a super absorbent resin, wherein the early strength agent is at least one selected from nitrite, chromate, triethanolamine, calcium formate and urea.
In the scheme, in the gradation requirements adopted by the asphalt/cement composite-based normal-temperature self-compacting asphalt concrete, the passing rate of each square hole sieve meets the following requirements: s is more than or equal to 20% 0.075mm ≤28％，25％≤S 0.15mm ≤35％，30％≤S 0.3mm ≤40％，34％≤S 0.6mm ≤44％，42％≤S 1.18mm ≤50％，48％≤S 2.36mm ≤58％，63％≤S 4.75mm ≤72％，80％≤S 9.5mm ≤90％，90％≤S 13.2mm ≤100％，S 16mm Equal to 100%.
The preparation method of the asphalt/cement composite base normal-temperature self-compacting asphalt concrete comprises the following steps:
1) Weighing the raw materials according to the proportion, wherein the raw materials and the weight parts of the raw materials comprise: 10-20 parts of emulsified asphalt, 4-12 parts of cement, 40-73 parts of aggregate, 12-23 parts of mineral powder, 1-3 parts of bonding agent and 1-5 parts of water; and an admixture accounting for less than 1% of the mass of the concrete;
2) Uniformly mixing the weighed cement, aggregate, mineral powder, bonding agent and admixture by a stirrer at room temperature for 3-5 min;
3) Adding 1-5 parts of water into the uniformly stirred mineral aggregate, and stirring for 1-2 min to wet the surface of the aggregate;
4) And finally adding emulsified asphalt, uniformly mixing the emulsified asphalt by a stirrer at room temperature until the mixture has fluidity, and directly paving the mixture for 3-5 min.
Compared with the prior art, the invention has the beneficial effects that:
1) Compared with the traditional pouring type asphalt mixture, the asphalt cement composite base self-compacting asphalt mixture disclosed by the invention only needs to be constructed at normal temperature, is convenient and quick to use, adopts the cement-based material to replace lake asphalt, can effectively ensure the high-temperature performance of the lake asphalt, and is wide in application range.
2) The asphalt cement composite base self-compacting asphalt mixture belongs to one kind of cold mixing materials, and has the advantages of no need of rolling and self-compacting (common cold mixing materials and hot mixing materials need to be compacted and formed) compared with other asphalt mixtures applied to roads.
3) According to the invention, the organic bonding agent is further introduced into the high-asphalt and high-mineral-powder asphalt concrete system, so that the fluidity and self-compactness of the high-powder-content asphalt mixture can be obviously improved, and good mechanical properties, working properties and the like are effectively considered;
4) The invention further optimizes the gradation of the asphalt mixture based on the emulsified asphalt cement-based formula system with high asphalt content, high mineral powder (containing cement) content and a small amount of water, so that the asphalt mixture has the advantage of self-compaction at normal temperature; the good fluidity of the pavement is utilized to realize pouring, leveling and compacting, the pavement with high density and no gap can be formed without rolling, and the pavement has the advantages of good water tightness, good durability, good cohesiveness, no rolling and the like; the problems that the void ratio of the emulsified asphalt mixture is large after the emulsified asphalt mixture is cured and molded, the water stability of the later cold-mixed asphalt mixture is poor and the like are effectively solved;
5) The construction at normal temperature greatly reduces the fuel consumption and the emission of harmful gases; meanwhile, mechanical rolling is not needed, the construction characteristics can be self-compacted, the construction process can be effectively simplified, labor is saved, and better economic and environmental benefits are achieved.
Drawings
FIG. 1 is a gradation curve of the asphalt/cement composite base normal temperature self-compacting asphalt concrete of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following examples, the aggregate used was limestone; wherein the grain size of the coarse aggregate is more than 5mm, and the grain size of the fine aggregate is 0-5 mm; the grading curve adopted is shown in figure 1; the cement is 42.5-grade ordinary Portland cement, the initial setting time is not less than 45min, and the final setting time is not more than 600min; the emulsified asphalt is road mixing type cation emulsified asphalt, the solid content of the emulsified asphalt is 58.3 percent, and the emulsified asphalt is common commercial BCR emulsified asphalt; the mineral powder is ground by limestone, and the passing rate of the mineral powder with the particle size of 0.075mm is more than 90%; the bonding agent is anti-settling aluminate ASA; the water reducing agent is a polycarboxylic acid water reducing agent.
Example 1
An asphalt/cement composite base normal temperature self-compacting asphalt concrete adopts a normal temperature self-compacting asphalt concrete grading median value, and comprises the following components in parts by weight: 12 parts of emulsified asphalt, 6-10 parts of cement, 66 parts of aggregate, 16 parts of mineral powder, 2 parts of bonding agent, 3 parts of water and 0.3 part of admixture (water reducing agent); wherein the aggregate comprises 24 parts of aggregate with the particle size of 0-3 mm, 28 parts of aggregate with the particle size of 3-5 mm, 10 parts of aggregate with the particle size of 5-10 mm and 4 parts of aggregate with the particle size of 10-15 mm; in the specific grading requirements, the passing rate of each square hole sieve is as follows: s. the 0.075mm ＝24％，S 0.15mm ＝30％，S 0.3mm ＝35％，S 0.6mm ＝39％，S 1.18mm ＝46％，S 2.36mm ＝53％，S 4.75mm ＝68％，S 9.5mm ＝85％，S 13.2mm ＝96％，S 16mm ＝100％；
Uniformly mixing the weighed aggregate, mineral powder, bonding agent and admixture with 6 (number 1-1), 8 (number 1-2) and 10 (number 1-3) parts by mass of cement at room temperature by using a stirrer for 3-5 min; adding water into the uniformly stirred mineral aggregate, and stirring for 1-2 min to wet the aggregate surface; finally, adding the weighed emulsified asphalt, and uniformly mixing the emulsified asphalt and the weighed emulsified asphalt by a stirrer at room temperature until the mixture has fluidity, wherein the stirring time is 3-5 min; the mixture with fluidity is directly poured, and the surface is smoothed (rolling is not needed).
After the mixing is finished, the fluidity of the mixture is tested, after the mixture is cured for 12 hours, 24 hours and 72 hours at normal temperature (25 ℃), the Marshall stability, unconfined compressive strength, dynamic stability and other performances of the mixture are respectively tested, and the specific test results are shown in Table 1.
TABLE 1 results of asphalt concrete performance tests obtained under different curing time conditions
The results show that the Liu Er fluidity meets the requirement of specification JTG/T3364-02-2019 on fluidity less than 20 s; the stability of the mixture is in a certain rising trend due to the increase of the mixing amount of the cement; the immersion tests meet the standard requirements and the partial immersion residue is more than 100 percent; because the freeze thawing can be soaked in water at 60 ℃ for 24 hours, the freeze thawing splitting ratio can be increased due to the increase of the cement content, and the freeze thawing splitting ratio meets the specification requirements; the advantages of normal temperature construction, self-compaction, early strength and the like can be effectively considered.
Example 2
An asphalt/cement composite base normal temperature self-compacting asphalt concrete adopts a normal temperature self-compacting asphalt concrete grading median value, and comprises the following components in parts by weight: 14 parts of emulsified asphalt, 6-10 parts of cement, 66 parts of aggregate, 16 parts of mineral powder, 2 parts of bonding agent, 3 parts of water and 0.03 part of water reducing agent; wherein the aggregate comprises 24 parts of aggregate with the grain diameter of 0-3 mm, 28 parts of aggregate with the grain diameter of 3-5 mm, 10 parts of aggregate with the grain diameter of 5-10 mm and 4 parts of aggregate with the grain diameter of 10-15 mm; in the specific grading requirements, the passing rate of each square hole sieve is as follows: s 0.075mm ＝24％，S 0.15mm ＝30％，S 0.3mm ＝35％，S 0.6mm ＝39％，S 1.18mm ＝46％，S 2.36mm ＝53％，S 4.75mm ＝68％，S 9.5mm ＝85％，S 13.2mm ＝96％，S 16mm ＝100％；
Uniformly mixing the weighed aggregate, mineral powder, bonding agent and admixture with 6 (number 2-1), 8 (number 2-2) and 10 (number 2-3) parts by mass of cement at room temperature by using a stirrer for 3-5 min; adding water into the uniformly stirred mineral aggregate, and stirring for 1-2 min to wet the aggregate surface; finally, adding the weighed emulsified asphalt, and uniformly mixing the emulsified asphalt and the weighed emulsified asphalt by a stirrer at room temperature until the mixture has fluidity, wherein the stirring time is 3-5 min; directly pouring the mixture with fluidity and smoothing the surface (without rolling);
after the mixing is finished, the fluidity of the test piece is tested, the test piece is cured for 12 hours, 24 hours and 72 hours at normal temperature (25 ℃) after being formed, and then the Marshall stability, unconfined compressive strength, dynamic stability and other performances are respectively tested, and the specific test results are shown in Table 2.
TABLE 2 results of testing the performance of asphalt concrete under different curing time conditions
Example 3
An asphalt/cement composite base normal temperature self-compacting asphalt concrete adopts a normal temperature self-compacting asphalt concrete grading median value, and comprises the following components in parts by weight: 16 parts of emulsified asphalt, 6-10 parts of cement, 66 parts of aggregate, 16 parts of mineral powder, 2 parts of bonding agent, 3 parts of water and 0.03 part of water reducing agent; wherein the aggregate comprises 24 parts of aggregate with the grain diameter of 0-3 mm, 28 parts of aggregate with the grain diameter of 3-5 mm, 10 parts of aggregate with the grain diameter of 5-10 mm and 4 parts of aggregate with the grain diameter of 10-15 mm; in the specific grading requirements, the passing rate of each square hole sieve is as follows: s 0.075mm ＝24％，S 0.15mm ＝30％，S 0.3mm ＝35％，S 0.6mm ＝39％，S 1.18mm ＝46％，S 2.36mm ＝53％，S 4.75mm ＝68％，S 9.5mm ＝85％，S 13.2mm ＝96％，S 16mm ＝100％；
Uniformly mixing the weighed aggregate, mineral powder, bonding agent and admixture with 6 (number 3-1), 8 (number 3-2) and 10 (number 3-3) parts by mass of cement at room temperature by using a stirrer for 3-5 min; adding water into the uniformly stirred mineral aggregate, and stirring for 1-2 min to wet the surface of the aggregate; finally, adding the weighed emulsified asphalt, and uniformly mixing the emulsified asphalt and the weighed emulsified asphalt by a stirrer at room temperature until the mixture has fluidity, wherein the stirring time is 3-5 min; directly pouring the mixture with fluidity and smoothing the surface (without rolling);
after the mixing is finished, the fluidity of the test piece is tested, the test piece is cured for 12 hours, 24 hours and 72 hours at normal temperature (25 ℃) after being formed, and then the Marshall stability, unconfined compressive strength, dynamic stability and other performances are respectively tested, and the specific test results are shown in Table 3.
TABLE 3 results of testing the performance of asphalt concrete obtained under different curing time conditions
Example 4
An asphalt/cement composite base normal temperature self-compacting asphalt concrete adopts a normal temperature self-compacting asphalt concrete grading median value, and comprises the following components in parts by weight: 12-16 parts of emulsified asphalt, 6 parts of cement, 66 parts of aggregate, 16 parts of mineral powder, 2 parts of bonding agent, 3 parts of water and 0.03 part of water reducing agent; wherein the aggregate comprises 24 parts of aggregate with the grain diameter of 0-3 mm, 28 parts of aggregate with the grain diameter of 3-5 mm, 10 parts of aggregate with the grain diameter of 5-10 mm and 4 parts of aggregate with the grain diameter of 10-15 mm; in the specific grading requirements, the passing rate of each square hole sieve is as follows: s. the 0.075mm ＝24％，S 0.15mm ＝30％，S 0.3mm ＝35％，S 0.6mm ＝39％，S 1.18mm ＝46％，S 2.36mm ＝53％，S 4.75mm ＝68％，S 9.5mm ＝85％，S 13.2mm ＝96％，S 16mm ＝100％；
Uniformly mixing the weighed mineral aggregate, cement, bonding agent and admixture by a stirrer at room temperature for 3-5 min; adding water into the uniformly stirred mineral aggregate, and stirring for 1-2 min to wet the aggregate surface; and finally, respectively adding 12 parts by mass (number 4-1), 14 parts by mass (number 4-2) and 16 parts by mass (number 4-3) of emulsified asphalt, and uniformly mixing the materials by a stirrer at room temperature until the mixture has fluidity, wherein the stirring time is 3-5 min. Directly pouring the mixture with fluidity and smoothing the surface (without rolling);
after the mixing is finished, the fluidity of the test piece is tested, the test piece is cured for 12 hours, 24 hours and 72 hours at normal temperature (25 ℃) after being formed, and then the Marshall stability, unconfined compressive strength, dynamic stability and other performances are respectively tested, and the specific test results are shown in Table 4.
TABLE 4 results of testing the performance of asphalt concrete obtained under different curing time conditions
Example 5
An asphalt/cement composite base normal temperature self-compacting asphalt concrete adopts a normal temperature self-compacting asphalt concrete grading median value, and comprises the following components in parts by weight: 12-16 parts of emulsified asphalt, 8 parts of cement, 66 parts of aggregate, 16 parts of mineral powder, 2 parts of bonding agent, 3 parts of water and 0.03 part of water reducing agent; wherein the aggregate comprises 24 parts of aggregate with the grain diameter of 0-3 mm, 28 parts of aggregate with the grain diameter of 3-5 mm, 10 parts of aggregate with the grain diameter of 5-10 mm and 4 parts of aggregate with the grain diameter of 10-15 mm; in the specific grading requirements, the passing rate of each square hole sieve is as follows: s 0.075mm ＝24％，S 0.15mm ＝30％，S 0.3mm ＝35％，S 0.6mm ＝39％，S 1.18mm ＝46％，S 2.36mm ＝53％，S 4.75mm ＝68％，S 9.5mm ＝85％，S 13.2mm ＝96％，S 16mm ＝100％；
Uniformly mixing the weighed mineral aggregate, cement, bonding agent and admixture by a stirrer at room temperature for 3-5 min; adding water into the uniformly stirred mineral aggregate, and stirring for 1-2 min to wet the surface of the aggregate; and finally, respectively adding 12 parts by mass (number 5-1), 14 parts by mass (number 5-2) and 16 parts by mass (number 5-3) of emulsified asphalt, and uniformly mixing the materials by a stirrer at room temperature until the mixture has fluidity, wherein the stirring time is 3-5 min. Directly pouring the mixture with fluidity and smoothing the surface (without rolling);
after the mixing is finished, the fluidity of the test piece is tested, the test piece is cured for 12 hours, 24 hours and 72 hours at normal temperature (25 ℃) after being formed, and then the Marshall stability, unconfined compressive strength, dynamic stability and other performances are respectively tested, and the specific test results are shown in Table 4.
TABLE 5 results of testing the performance of asphalt concrete obtained under different curing time conditions
Example 6
An asphalt/cement composite base normal temperature self-compacting asphalt concrete adopts a normal temperature self-compacting asphalt concrete grading median value, and comprises the following components in parts by weight: 12-16 parts of emulsified asphalt, 10 parts of cement, 66 parts of aggregate, 16 parts of mineral powder, 2 parts of bonding agent, 3 parts of water and 0.03 part of water reducing agent; wherein the aggregate comprises 24 parts of aggregate with the grain diameter of 0-3 mm, 28 parts of aggregate with the grain diameter of 3-5 mm, 10 parts of aggregate with the grain diameter of 5-10 mm and 4 parts of aggregate with the grain diameter of 10-15 mm; in the specific grading requirements, the passing rate of each square hole sieve is as follows: s 0.075mm ＝24％，S 0.15mm ＝30％，S 0.3mm ＝35％，S 0.6mm ＝39％，S 1.18mm ＝46％，S 2.36mm ＝53％，S 4.75mm ＝68％，S 9.5mm ＝85％，S 13.2mm ＝96％，S 16mm ＝100％；
Uniformly mixing the weighed mineral aggregate, cement, bonding agent and admixture by a stirrer at room temperature for 3-5 min; adding water into the uniformly stirred mineral aggregate, and stirring for 1-2 min to wet the aggregate surface; and finally, respectively adding 12 parts by mass (number 6-1), 14 parts by mass (number 6-2) and 16 parts by mass (number 6-3) of emulsified asphalt, and uniformly mixing the materials at room temperature by a stirrer until the mixture has fluidity, wherein the stirring time is 3-5 min. Directly pouring the mixture with fluidity and smoothing the surface (without rolling);
after the mixing is finished, the fluidity of the test piece is tested, the test piece is cured for 12 hours, 24 hours and 72 hours at normal temperature (25 ℃) after being formed, and then the Marshall stability, unconfined compressive strength, dynamic stability and other performances are respectively tested, and the specific test results are shown in Table 6.
TABLE 6 test results of asphalt concrete performance obtained under different curing time conditions
Example 7
An asphalt/cement composite base normal temperature self-compacting asphalt concrete adopts a normal temperature self-compacting asphalt concrete grading lower limit, and comprises the following components in parts by weight: 12 parts of emulsified asphalt, 8 parts of cement, 70 parts of aggregate, 14 parts of mineral powder, 2 parts of bonding agent, 3 parts of water and 0.03 part of water reducing agent; wherein the aggregate comprises 30 parts of aggregate with the grain diameter of 0-3 mm, 15 parts of aggregate with the grain diameter of 3-5 mm, 15 parts of aggregate with the grain diameter of 5-10 mm and 10 parts of aggregate with the grain diameter of 10-15 mm; in the specific grading requirements, the passing rate of each square hole sieve is as follows: s 0.075mm ＝20％，S 0.15mm ＝25％，S 0.3mm ＝31％，S 0.6mm ＝35％，S 1.18mm ＝42％，S 2.36mm ＝48％，S 4.75mm ＝65％，S 9.5mm ＝80％，S 13.2mm ＝91％，S 16mm ＝100％；
Uniformly mixing the weighed mineral aggregate, cement, bonding agent and admixture by a stirrer at room temperature for 3-5 min; adding water into the uniformly stirred mineral aggregate, and stirring for 1-2 min to wet the aggregate surface; finally, adding emulsified asphalt, and uniformly mixing the emulsified asphalt and the emulsified asphalt at room temperature by using a stirrer until the mixture has fluidity, wherein the stirring time is 3-5 min; directly pouring the mixture with fluidity and smoothing the surface (without rolling);
after the mixing is finished, the fluidity of the asphalt/cement composite base normal-temperature self-compacting asphalt concrete is tested, and after the test piece is formed and cured for 12 hours, 24 hours and 72 hours at normal temperature (25 ℃), the Marshall stability, unconfined compressive strength, dynamic stability and other performances of the test piece are respectively tested.
Example 8
Asphalt/cement compositeThe normal-temperature self-compacting asphalt concrete adopts normal-temperature self-compacting asphalt concrete grading upper limit, and comprises the following components in parts by weight: 12 parts of emulsified asphalt, 8 parts of cement, 70 parts of aggregate, 20 parts of mineral powder, 2 parts of bonding agent, 3 parts of water and 0.03 part of water reducing agent; wherein the aggregate comprises 40 parts of aggregate with the grain diameter of 0-3 mm, 18 parts of aggregate with the grain diameter of 3-5 mm, 10 parts of aggregate with the grain diameter of 5-10 mm and 2 parts of aggregate with the grain diameter of 10-15 mm; in the specific grading requirements, the passing rate of each square hole sieve is as follows: s. the 0.075mm ＝28％，S 0.15mm ＝35％，S 0.3mm ＝39％，S 0.6mm ＝44％，S 1.18mm ＝49％，S 2.36mm ＝58％，S 4.75mm ＝70％，S 9.5mm ＝90％，S 13.2mm ＝99％，S 16mm ＝100％；
Uniformly mixing the weighed mineral aggregate, cement, bonding agent and admixture by a stirrer at room temperature for 3-5 min; adding water into the uniformly stirred mineral aggregate, and stirring for 1-2 min to wet the aggregate surface; finally, adding emulsified asphalt, and uniformly mixing the emulsified asphalt and the emulsified asphalt at room temperature by using a stirrer until the mixture has fluidity, wherein the stirring time is 3-5 min; directly pouring the mixture with fluidity and smoothing the surface (without rolling);
after the mixing is finished, the fluidity of the asphalt/cement composite base normal-temperature self-compacting asphalt concrete is tested, and after the test piece is formed and cured for 12 hours, 24 hours and 72 hours at normal temperature (25 ℃), the Marshall stability, unconfined compressive strength, dynamic stability and other performances of the test piece are respectively tested.
Comparative example 1
The preparation method of the asphalt/cement composite base asphalt concrete is approximately the same as that of the preparation method of the embodiment 1 of the invention, and is characterized in that a silane coupling agent (7-1) and a titanate coupling agent (7-2) are respectively adopted to replace a bonding agent adopted by the invention, wherein the silane coupling agent is a commercially available KH570 type silane coupling agent, and the titanate coupling agent is a commercially available KR-9S type titanate coupling agent.
The properties of the test piece, such as Marshall stability, unconfined compressive strength, dynamic stability and the like, are respectively tested, and the specific test results are shown in Table 7.
TABLE 7 results of testing the performance of asphalt concrete obtained under different curing time conditions
According to test results, compared with a bonding agent, the flow time of the mixture adopting the conventional coupling agent is greatly reduced, the mixture has certain fluidity, but the flow degree of the Liu-El is more than 20s, the construction workability is poor, the mixture cannot be compacted, the porosity of the mixture is about 3%, and the strength and the stability are reduced; due to the excessive porosity, the water stability is insufficient, and the part even does not meet the requirements of specification JTG D50-2017.
Comparative example 2
The asphalt/cement composite base asphalt concrete adopts different grading conditions, and specifically comprises the following steps:
1) Referring to the asphalt/cement composite base normal temperature self-compacting asphalt concrete formula described in embodiment 2 of the invention, fine grain type LB-10 gradation (number 8-1) is adopted, and in the specific gradation requirement, the passing rate of each square hole sieve is as follows: s 0.075mm ＝5％，S 0.15mm ＝8％，S 0.3mm ＝12％，S 0.6mm ＝15％，S 1.18mm ＝20％，S 2.36mm ＝40％，S 4.75mm ＝60％，S 9.5mm ＝90％，S 13.2mm ＝100％，S 16mm ＝100％；
2) Referring to technical Specification for road asphalt pavement construction JTG F40-2004, a common cement emulsified asphalt mixture formula is utilized, and a fine grain type LB-13 gradation (serial number 8-2) is adopted; in the specific grading requirements, the passing rate of each square hole sieve is as follows: s 0.075mm ＝5％，S 0.15mm ＝8％，S 0.3mm ＝12％，S 0.6mm ＝15％，S 1.18mm ＝20％，S 2.36mm ＝40％，S 4.75mm ＝60％，S 9.5mm ＝75％，S 13.2mm ＝90％，S 16mm ＝100％；
3) Referring to technical Specification for road asphalt pavement construction JTG F40-2004, the formula of the common cement emulsified asphalt mixture is utilized, and AC-13 gradation (serial number 8-3) is adopted; in the specific grading requirements, the passing rate of each square hole sieve is as follows: s 0.075mm ＝5％，S 0.15mm ＝8％，S 0.3mm ＝12％，S 0.6mm ＝20％，S 1.18mm ＝30％，S 2.36mm ＝40％，S 4.75mm ＝60％，S 9.5mm ＝75％，S 13.2mm ＝90％，S 16mm ＝100％；
4) Referring to technical Specification for road asphalt pavement construction JTG F40-2004, the formula of a common hot-mix asphalt mixture is utilized, and AC-13 gradation (number 8-4) is adopted; in the specific grading requirements, the passing rate of each square hole sieve is as follows: s 0.075mm ＝5％，S 0.15mm ＝8％，S 0.3mm ＝12％，S 0.6mm ＝20％，S 1.18mm ＝30％，S 2.36mm ＝40％，S 4.75mm ＝60％，S 9.5mm ＝75％，S 13.2mm ＝90％，S 16mm ＝100％；
5) Referring to technical Specifications for pavement and construction of steel bridge decks of roads (JTG/T3364-02-2019), a pouring asphalt mixture formula is utilized, and China is adopted to obtain pouring asphalt mixture grading GA-13 (serial number 8-5); in the specific grading requirements, the passing rate of each square hole sieve is as follows: s 0.075mm ＝25％，S 0.15mm ＝30％，S 0.3mm ＝35％，S 0.6mm ＝40％，S 1.18mm ＝46％，S 2.36mm ＝53％，S 4.75mm ＝71％，S 9.5mm ＝90％，S 13 .2mm＝96％，S 16mm ＝100％。
TABLE 8 mineral grading requirements for various types of mixes
After normal mixing is finished, the flowable time of the mixture is immediately tested, a self-compacting or compaction forming test piece is adopted, the test piece is cured for 72 hours after being formed, the Marshall stability and the porosity of the test piece are respectively tested, and the specific test results are shown in Table 9.
TABLE 9 comparison of the Properties of different types of asphalt concretes
The above results show that: the asphalt/cement composite base high-performance self-compacting asphalt pavement rapid repairing material obtained by the invention has self-compacting property, and does not need to be compacted (the void ratio is far less than that of a common asphalt mixture and is less than 1 percent); the normal-temperature repair of the asphalt pavement pit can be realized, and the asphalt pavement pit can be filled under the normal-temperature condition; the strength can be quickly formed, and the traffic can be opened as soon as possible; the molded product has good water tightness, durability, caking property and the like.
The above embodiments are merely examples for clearly illustrating the present invention and do not limit the present invention. Other variants and modifications of the invention, which are obvious to those skilled in the art and can be made on the basis of the above description, are not necessary or exhaustive for all embodiments, and are therefore within the scope of the invention.
Claims (6)
1. The asphalt/cement composite base normal temperature self-compacting asphalt concrete is characterized by comprising the following components in parts by weight: 10-20 parts of emulsified asphalt, 4-12 parts of cement, 40-73 parts of aggregate, 12-23 parts of mineral powder, 1-3 parts of bonding agent and 1-5 parts of water;
the emulsified asphalt is road mixing type cation emulsified asphalt or road mixing type cation modified emulsified asphalt;
the bonding agent is anti-settling aluminate ASA;
in the grading requirements adopted by the asphalt/cement composite-based normal-temperature self-compacting asphalt concrete, the passing rate of each square hole sieve meets the following requirements: s is more than or equal to 20% 0.075mm ≤28％，25％≤S 0.15mm ≤35％，30％≤S 0.3mm ≤40％，34％≤S 0.6mm ≤44％，42％≤S 1.18mm ≤50％，48％≤S 2.36mm ≤58％，63％≤S 4.75mm ≤72％，80％≤S 9.5mm ≤90％，90％≤S 13.2mm ≤100％，S 16mm ＝100％。
2. The asphalt/cement composite-based normal-temperature self-compacting asphalt concrete according to claim 1, wherein the pavement mixing type cationic emulsified asphalt has an evaporation residue content of 55% or more, an evaporation residue penetration at 25 ℃ of 45-150 dmm, and an extensibility at 15 ℃ of not less than 40cm; the content of evaporation residue of the mixing type cation modified emulsified asphalt for roads is not less than 60 percent, the penetration of evaporation residue at 25 ℃ is 40-100dmm, and the ductility at 5 ℃ is not less than 20cm.
3. The asphalt/cement composite base normal temperature self-compacting asphalt concrete according to claim 1, characterized in that the cement is one or more of Portland cement, aluminate cement and sulphoaluminate cement.
4. The asphalt/cement composite base normal temperature self-compacting asphalt concrete according to claim 1, wherein the aggregate is one or more of basalt, limestone, diabase and steel slag aggregate, and is divided into coarse aggregate and fine aggregate, wherein the particle size of the coarse aggregate is 5-15 mm, and the particle size of the fine aggregate is 0-5 mm; the filler adopts limestone mineral powder, and the passing rate of the limestone mineral powder with the particle size of 0.075mm is more than 90%.
5. The asphalt/cement composite base normal temperature self-compacting asphalt concrete according to claim 1, characterized in that the asphalt/cement composite base normal temperature self-compacting asphalt concrete comprises an admixture, and the dosage of the admixture accounts for less than 1% of the mass of the concrete; is at least one of a polycarboxylate water reducing agent, an early strength agent and a super absorbent resin.
6. The preparation method of the asphalt/cement composite base normal temperature self-compacting asphalt concrete of any one of claims 1 to 5, which is characterized by comprising the following steps:
1) Weighing the raw materials according to the proportion, wherein the raw materials and the weight parts of the raw materials comprise: 10-20 parts of emulsified asphalt, 4-12 parts of cement, 40-73 parts of aggregate, 12-23 parts of mineral powder, 1-3 parts of bonding agent and 1-5 parts of water; and an admixture accounting for less than 1% of the mass of the concrete;
2) Uniformly mixing the weighed cement, aggregate, mineral powder, bonding agent and admixture at room temperature;
3) Adding water into the uniformly stirred mineral aggregate, and stirring to wet the surface of the aggregate;
4) And finally, adding emulsified asphalt, uniformly mixing the emulsified asphalt and the emulsified asphalt at room temperature by using a stirrer until the mixture has fluidity, and directly paving the mixture.
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