CN110981287A - High-binding-property recycled asphalt concrete and preparation process thereof - Google Patents
High-binding-property recycled asphalt concrete and preparation process thereof Download PDFInfo
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- CN110981287A CN110981287A CN201911357688.8A CN201911357688A CN110981287A CN 110981287 A CN110981287 A CN 110981287A CN 201911357688 A CN201911357688 A CN 201911357688A CN 110981287 A CN110981287 A CN 110981287A
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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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
- C04B2111/00008—Obtaining or using nanotechnology related materials
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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
Abstract
The invention relates to the technical field of preparation of recycled asphalt concrete, and aims to provide high-bonding recycled asphalt concrete and a preparation process thereof, wherein the technical scheme is characterized by comprising the following components in parts by weight: 73-88 parts of mixed aggregate, 3-7 parts of SBS modified asphalt, 0.5-0.9 part of fly ash, 22-26 parts of regenerated asphalt mixed old material, 0.15-0.25 part of regenerant, 0.1-0.15 part of defoamer, 5-13 parts of steel slag, 5-9 parts of reinforcing fiber, 5-10 parts of filler, 5-9 parts of fluororubber powder and 5-8 parts of graphene. The invention has the advantages of strong bonding performance with old concrete during paving, good cohesiveness and difficult generation of cracks.
Description
Technical Field
The invention relates to the technical field of preparation of recycled asphalt concrete, in particular to high-binding recycled asphalt concrete and a preparation process thereof.
Background
Asphalt concrete is also called as asphalt concrete, and is a mixture prepared by mixing mineral aggregate, crushed stone or crushed gravel, mineral powder and the like which are composed of a certain gradation, then mixing with a certain proportion of road asphalt material, and stirring under specific process conditions.
Chinese patent No. CN109095828A discloses an asphalt concrete and a production process thereof, wherein the asphalt concrete is prepared from the following raw materials by weight: 13-25 wt% of modified asphalt, 6-15 wt% of cement, 46-63 wt% of aggregate, 16-33 wt% of filler and 1-5 wt% of auxiliary agent; the preparation method comprises the following steps: weighing raw materials of each component according to a set proportion, and heating the weighed modified asphalt to 180-190 ℃ for later use; uniformly mixing cement, aggregate, a filler and an auxiliary agent to obtain a mixture; and adding the heated modified asphalt into the mixture, and stirring for 1-2 min at 160-190 ℃ to obtain the asphalt concrete.
Although the prior art scheme can be used for paving the asphalt concrete pavement and can reduce the cracking of the pavement to a certain extent, in the actual use process, new asphalt concrete and old asphalt concrete need to be combined, and the difference between the new asphalt concrete and the old asphalt concrete causes poor combination between the new asphalt concrete and the old asphalt concrete, so that the splicing part of the new asphalt concrete and the old asphalt concrete is easy to generate cracks, and the whole service life of the road is greatly reduced. Therefore, it is required to develop a recycled asphalt concrete having high binding property to solve the above problems.
SUMMARY OF THE PATENT FOR INVENTION
The first purpose of the invention is to provide a high-bonding recycled asphalt concrete, which has the advantages of strong bonding performance with old concrete during paving, good bonding performance and difficult generation of cracks, and obviously prolongs the service life of an asphalt pavement.
The technical purpose of the invention is realized by the following technical scheme:
the high-binding-property recycled asphalt concrete comprises the following components in parts by weight: 73-88 parts of mixed aggregate, 3-7 parts of SBS modified asphalt, 0.5-0.9 part of fly ash, 22-26 parts of regenerated asphalt mixed old material, 0.15-0.25 part of regenerant, 0.1-0.15 part of defoamer, 5-13 parts of steel slag, 5-9 parts of reinforcing fiber and 5-10 parts of filler.
By adopting the technical scheme, the old regenerated asphalt mixture is obtained by digging, recovering, crushing and screening the old asphalt pavement, but the asphalt in the old regenerated asphalt mixture is aged in different degrees in the long-term use process, and the compatibility of the asphalt can be effectively improved by adding the regenerant, so that the penetration and ductility of the asphalt are improved; the steel slag is a byproduct in the steel-making process, has high strength, rough and porous surface, good wear resistance and durability, has good adhesion performance with the asphalt concrete, and can obviously improve the road performances of the regenerated asphalt concrete, such as wear resistance, rutting resistance, crack resistance and the like.
The specific surface area of the fly ash is huge, the surface has a rich microporous structure, the adsorption is extremely strong, the workability with the asphalt is good, and after the fly ash is fully contacted with the asphalt, the asphaltene can be quickly immersed into pores on the surface of the fly ash to be gelated and hardened, so that the anchoring effect on the fly ash is generated, the mechanical binding force between the asphalt and the fly ash is increased, and the binding force and the splitting strength of asphalt concrete are obviously improved; on the other hand, the reinforcing fiber forms a space net structure through a bonding effect between the asphaltene immersed in the pores of the fly ash and the fly ash, so that the connection fastness between the asphalt and the fly ash is further improved, and the internal friction force and the tear strength of the asphalt concrete are effectively improved. When the recycled asphalt concrete is spliced with the old asphalt concrete pavement, part of the fly ash which is infiltrated with the asphaltine and cemented with the reinforcing fiber can be adsorbed, infiltrated and bonded on the old asphalt shallow surface layer, so that the bonding force between the recycled asphalt concrete and the old asphalt concrete is improved, and the spliced pavement is not easy to crack.
The filling material has good filling property and wear resistance, strong chemical corrosion resistance and can obviously improve the overall quality of the recycled asphalt concrete. Meanwhile, the filler and the fly ash can play a synergistic effect, so that the prepared asphalt and the reinforced fiber can better form a space bonding system, and the increase of the overall bonding strength of the recycled asphalt concrete is facilitated. The defoaming agent can avoid the generation of bubbles in the recycled asphalt concrete, so that the recycled asphalt concrete can be closely attached to the old asphalt concrete on the road when being paved.
Further, the high-binding-property recycled asphalt concrete also comprises 5-9 parts by weight of fluororubber powder, and the particle size of the fluororubber powder is 80-200 meshes.
By adopting the technical scheme, the fluororubber powder can absorb various organic matters such as resin, aromatic hydrocarbon oil and the like in the asphalt, and the rubber powder is wetted, expanded, increased in viscosity and improved in softening point through a series of physical and chemical changes, so that the viscosity, toughness and elasticity of the asphalt can be obviously improved, and the pavement performance of the recycled asphalt concrete is improved.
Further, the high-binding-property recycled asphalt concrete also comprises 5-8 parts by weight of graphene.
By adopting the technical scheme, the graphene is a nano material with huge specific surface area and super strong surface activity, and can be used as a modifier to be added into the asphalt binder to obviously improve the high temperature resistance and aging resistance of the asphalt.
Furthermore, the mixed aggregate comprises new aggregate and regenerated aggregate in a mass ratio of 2 (1-1.5).
By adopting the technical scheme, the waste old aggregate can be recycled by compounding the regenerated aggregate and the new aggregate, and the resource utilization rate is improved.
Furthermore, the new aggregate mainly comprises limestone with the particle size of 0-3 mm, 3-5 mm, 5-13 mm, 13-20 mm and 20-25 mm in parts by weight (1.2-2.8), (2.5-4.3), (6.5-8.5) and (3.5-4.5).
By adopting the technical scheme, the limestone and SBS modified asphalt have good bonding performance, the interface strength of the limestone and SBS modified asphalt is not easy to weaken due to the drastic change of the external temperature, and the recycled asphalt concrete has good stability in the using process; limestone with different particle sizes is selected to form new aggregates, so that colloid nets with alternate density are formed in the regenerated asphalt concrete by the new aggregates, the old regenerated asphalt mixture and the SBS modified asphalt, the uniform dispersion of reinforced fibers is facilitated, the fly ash and the filler form a stable filling system in the regenerated asphalt concrete, the components of the regenerated asphalt concrete are combined more tightly, the uniformity is better, and the combination performance of the regenerated concrete is improved.
Further, the preparation method of the reclaimed aggregate comprises the following steps:
s1, throwing the waste concrete blocks into a jaw crusher to be crushed;
s2, screening crushed concrete slag and particles, and grading for the first time;
s3, washing the screened waste concrete particles with water and airing;
s4, carrying out secondary screening on the dried concrete particles to form recycled coarse aggregate with the particle size of 5-8 mm;
s5, mixing 5-10 parts of reinforcing modifier and water according to the mass ratio of 2:3 to form reinforcing slurry, respectively adding the regenerated coarse aggregate into the reinforcing slurry according to the solid-liquid mass ratio of 3:1, stirring and mixing for 10-20 min, and filtering and airing the regenerated coarse aggregate before the slurry is initially set to obtain the regenerated aggregate.
By adopting the technical scheme, the waste concrete blocks can be quickly crushed by the jaw crusher, the regenerated concrete particles within a specific particle size range are formed by sieving and primary grading, dust, impurities and original cement residues on the surfaces of the particles can be washed clean by washing the regenerated concrete particles with water, and secondary screening is carried out after drying to form the regenerated coarse aggregate within a required particle size range for later use; the recycled coarse aggregate is soaked in the reinforcing slurry for stirring, so that the reinforcing modifier is adsorbed and adhered on the surface of the recycled coarse aggregate particles, and the effect of reinforcing the recycled coarse aggregate particles is achieved.
Further, the reinforcing modifier in the step S5 includes PVA and sodium silicate in a mass ratio of 1:1.
By adopting the technical scheme, the sodium silicate generates large OH after ionization in water-，OH-Penetrate through the surface of the fly ash and enter the inner pores of the fly ash, so that free sulfate radicals and calcium ions are interacted to form a stable compound, and further the fly ash forms a more uniform and stable gel system; PVA has good solubility and strong adhesiveness, and can improve the bonding effect of the reinforcing modifier.
Further, the reinforcing fiber is preferably one or more of a lignin fiber, a brucite fiber and a sepiolite fiber.
By adopting the technical scheme, the lignin fiber, the brucite fiber and the sepiolite fiber have excellent characteristics of corrosion resistance, radiation resistance, insulation, heat insulation and the like, and have good filling property in the recycled asphalt concrete, so that the recycled asphalt concrete has good compactness and structural strength. Meanwhile, the reinforcing fibers can form good bonding property with asphalt and can form a net structure in the recycled asphalt concrete, so that the recycled asphalt concrete has good tear resistance and rutting resistance.
Further, the filler comprises one or more of carbon black, nano titanium oxide, nano silicon oxide and nano kaolin.
By adopting the technical scheme, the carbon black, the nano titanium oxide, the nano silicon oxide and the nano kaolin are excellent reinforcing fillers, have good dispersibility in the recycled asphalt concrete, have good bonding property with all components in the recycled asphalt concrete, can improve the structural strength of the recycled asphalt concrete, can ensure that the recycled asphalt concrete keeps good stability in the using process, and further ensure that the whole road has longer service life.
The second purpose of the invention is to provide a preparation process of high-binding recycled asphalt concrete, and the recycled asphalt concrete prepared by the process has good binding strength with old asphalt concrete during laying and is not easy to generate cracks during use.
In order to achieve the second purpose, the invention provides the following technical scheme, which comprises the following steps:
s1, drying and stirring the mixed aggregate, the steel slag, the reinforced fiber and the filler in corresponding weight parts in a drying barrel, setting the temperature to be 78-110 ℃, the time to be 30-45 min and the stirring speed to be 1000-1250 rpm, and stirring and mixing to obtain a dried mixture;
s2, adding the dry mixture prepared in the step S1 into a mixing cylinder, heating two thirds of SBS modified asphalt to 145-160 ℃, uniformly adding the SBS modified asphalt into the mixing cylinder within 20-25S, and stirring at the stirring speed of 1200-1250 rpm; s3, preheating the used regenerated asphalt mixture, adding the preheated regenerated asphalt mixture and a regenerant into a mixing cylinder in the step S2, stirring, keeping the temperature at 160-170 ℃, the stirring speed at 800-1200 rpm for 25-30 min, adding the rest parts by weight of SBS modified asphalt, and stirring at 700-800 rpm for 15-20 min;
s4, adding the fly ash and the defoaming agent into the mixing cylinder in the step S3, and continuously stirring and mixing until the mixture is uniform to obtain the recycled asphalt concrete, wherein the discharging temperature is 160-170 ℃.
By adopting the technical scheme, the mixed aggregate, the steel slag, the reinforced fiber and the filler are dried and mixed in the drying barrel, so that the probability that the components are bonded together due to moisture is reduced as much as possible, the materials can be fully and uniformly mixed, and the performance and the quality of the recycled asphalt concrete are improved. Firstly, mixing part of SBS modified asphalt with the mixture, then adding the preheated regenerated asphalt mixed old material mixed with the regenerant, finally adding the rest SBS modified asphalt, adding the fly ash and the defoamer, and fully and uniformly mixing, thereby obtaining the regenerated asphalt concrete with good quality uniformity and excellent performance.
In conclusion, the invention has the following beneficial effects:
1. the fly ash has a rich and uniform pore structure, has a large specific surface area, has strong adsorption capacity and good workability with asphalt, and can be quickly immersed into pores on the surface of the fly ash to be gelated and hardened after being fully contacted with the asphalt, so that the fly ash can generate an anchoring effect, the mechanical binding force between the asphalt and the fly ash is increased, and the binding force and the anti-cracking strength of the recycled asphalt concrete are obviously improved;
2. by adding the reinforcing fibers, the reinforcing fibers can form a space net structure through a bonding effect between the asphaltenes immersed in the pores of the fly ash and the fly ash, so that the connection fastness between the asphalt and the fly ash is further improved, the internal friction force and the tear strength of the asphalt concrete are effectively improved, the bonding force between the recycled asphalt concrete and the asphalt concrete is further improved, and the spliced pavement is not easy to crack;
3. by adding the fluororubber powder, the fluororubber powder can absorb various organic matters such as resin, aromatic hydrocarbon oil and the like in the asphalt and undergo a series of physical and chemical changes to wet and expand the rubber powder, increase the viscosity and improve the softening point, so that the viscosity, toughness and elasticity of the asphalt can be obviously improved, and the pavement performance of the recycled asphalt concrete is improved;
4. by adding the reinforcing filler, the asphalt concrete has good dispersibility in the recycled asphalt concrete and good binding property with each component in the recycled asphalt concrete, so that the structural strength of the recycled asphalt concrete can be improved, the recycled asphalt concrete can maintain good stability in the using process, and the whole road has longer service life.
Detailed Description
The present invention will be described in further detail with reference to the following examples.
Examples 1 to 6 for producing recycled aggregate:
TABLE 1 raw material ratios of regenerated aggregates of preparation examples 1 to 6
Preparation example 1: according to the raw material proportion in the table 1, 2.5 parts of PVA and 2.5 parts of sodium silicate are added into 7.5 parts of water and uniformly mixed to form reinforced slurry, 37.5 parts of regenerated coarse aggregate is added into the reinforced slurry, the mixture is stirred and mixed for 10min, and the regenerated coarse aggregate is filtered and dried before the slurry is initially set, so that the regenerated aggregate is prepared.
Preparation example 2: according to the raw material proportion in the table 1, 3 parts of PVA and 3 parts of sodium silicate are added into 9 parts of water and uniformly mixed to form reinforced slurry, 45 parts of regenerated coarse aggregate is added into the reinforced slurry, the mixture is stirred and mixed for 12min, and the regenerated coarse aggregate is filtered and dried before the slurry is initially solidified, so that the regenerated aggregate is prepared.
Preparation example 3: according to the raw material proportion in the table 1, 3.5 parts of PVA and 3.5 parts of sodium silicate are added into 10.5 parts of water and uniformly mixed to form reinforced slurry, 52.5 parts of regenerated coarse aggregate is added into the reinforced slurry, the mixture is stirred and mixed for 14min, and the regenerated coarse aggregate is filtered and dried before the slurry is initially set, so that the regenerated aggregate is prepared.
Preparation example 4: according to the raw material proportion in the table 1, 4 parts of PVA and 4 parts of sodium silicate are added into 12 parts of water and uniformly mixed to form reinforced slurry, 60 parts of regenerated coarse aggregate is added into the reinforced slurry, the mixture is stirred and mixed for 16min, and the regenerated coarse aggregate is filtered and dried before the slurry is initially solidified, so that the regenerated aggregate is prepared.
Preparation example 5: according to the raw material proportion in the table 1, 4.5 parts of PVA and 4.5 parts of sodium silicate are added into 13.54 parts of water and uniformly mixed to form reinforced slurry, 67.5 parts of regenerated coarse aggregate is added into the reinforced slurry, the mixture is stirred and mixed for 18min, and the regenerated coarse aggregate is filtered and dried before the slurry is initially set, so that the regenerated aggregate is prepared.
Preparation example 6: according to the raw material proportion in the table 1, 5 parts of PVA and 5 parts of sodium silicate are added into 15 parts of water and uniformly mixed to form reinforced slurry, 75 parts of regenerated coarse aggregate is added into the reinforced slurry, the mixture is stirred and mixed for 20min, and the regenerated coarse aggregate is filtered and dried before the slurry is initially solidified, so that the regenerated aggregate is prepared.
Example 1: the high-binding regenerated asphalt concrete is prepared by the following steps:
s1, drying and stirring 73 parts of mixed aggregate, 5 parts of steel slag, 5 parts of reinforcing fiber, 5 parts of filler, 5 parts of rubber powder and 5 parts of graphene in a drying barrel, setting the temperature at 78 ℃, the time at 30min and the stirring speed at 1000-1250 rpm, and stirring and mixing to obtain a dried mixture, wherein the mass ratio of the new aggregate to the regenerated aggregate is 2:1, and the regenerated aggregate is prepared in preparation example 1; the novel aggregate mainly comprises limestone with the particle size ranges of 0-3 mm, 3-5 mm, 5-13 mm, 13-20 mm and 20-25 mm according to the weight part ratio of 1.2:2.5:6.5:1.5: 3.5;
s2, adding the dry mixture obtained in the step S1 into a mixing cylinder, heating 2 parts of SBS modified asphalt to 145 ℃, uniformly adding the SBS modified asphalt into the mixing cylinder within 20S, and stirring at the stirring speed of 1200 rpm;
s3, preheating 22 parts of the old regenerated asphalt mixture, adding the preheated old regenerated asphalt mixture and 0.15 part of regenerant into a mixing cylinder in the step S2, stirring at the temperature of 160 ℃, the stirring speed of 800rpm for 25min, adding 1 part of SBS modified asphalt, and stirring at the speed of 700rpm for 15 min;
s4, adding 0.5 part of fly ash and 0.1 part of defoaming agent into the mixing cylinder in the step S3, and continuously stirring and mixing until the mixture is uniform to obtain the recycled asphalt concrete, wherein the discharging temperature is 160-170 ℃.
Example 2: the high-binding regenerated asphalt concrete is prepared by the following steps:
s1, drying and stirring 75 parts of mixed aggregate, 6 parts of steel slag, 5.5 parts of reinforcing fiber, 6 parts of filler, 5.5 parts of rubber powder and 5.5 parts of graphene in a drying barrel, setting the temperature to be 83 ℃, the time to be 32min and the stirring speed to be 1050rpm, stirring and mixing to obtain a dry mixed material, wherein the mass ratio of the new aggregate to the regenerated aggregate is 2:1, and the regenerated aggregate is prepared in preparation example 2; the novel aggregate mainly comprises limestone with the particle size ranges of 0-3 mm, 3-5 mm, 5-13 mm, 13-20 mm and 20-25 mm according to the weight part ratio of 1.5:2.8:6.8:1.5: 3.7;
s2, adding the dry mixture obtained in the step S1 into a mixing cylinder, heating 2.3 parts of SBS modified asphalt to 147 ℃, uniformly adding the SBS modified asphalt into the mixing cylinder within 21S, and stirring at 1210 rpm;
s3, preheating 22.5 parts of the old regenerated asphalt mixture, adding the preheated old regenerated asphalt mixture and 0.17 part of a regenerant into a mixing cylinder in the step S2, stirring at the temperature of 162 ℃ for 26min at the stirring speed of 850rpm, adding 1.2 parts of SBS modified asphalt, and stirring at the stirring speed of 720rpm for 16 min;
s4, adding 0.55 part of fly ash and 0.11 part of defoaming agent into the mixing cylinder in the step S3, and continuously stirring and mixing until the mixture is uniform to obtain the recycled asphalt concrete, wherein the discharging temperature is 160-170 ℃.
Example 3: the high-binding regenerated asphalt concrete is prepared by the following steps:
s1, drying and stirring 77 parts of mixed aggregate, 7 parts of steel slag, 6 parts of reinforcing fiber, 6.5 parts of filler, 6 parts of rubber powder and 6 parts of graphene in a drying barrel, setting the temperature at 88 ℃, the time at 34min and the stirring speed at 1100rpm, and stirring and mixing to obtain a dried mixed material, wherein the mass ratio of the new aggregate to the regenerated aggregate is 2:1.2, and the regenerated aggregate is prepared in preparation example 1; the novel aggregate mainly comprises limestone with the particle size ranges of 0-3 mm, 3-5 mm, 5-13 mm, 13-20 mm and 20-25 mm according to the weight part ratio of 1.8:3.1:7.1:1.5: 3.9;
s2, adding the dry mixture obtained in the step S1 into a mixing cylinder, heating 2.7 parts of SBS modified asphalt to 149 ℃, uniformly adding the SBS modified asphalt into the mixing cylinder within 22S, and stirring at the speed of 1220 rpm;
s3, preheating 23 parts of the old regenerated asphalt mixture, adding the preheated old regenerated asphalt mixture and 0.19 part of a regenerant into a mixing cylinder in the step S2, stirring at the temperature of 164 ℃ at the stirring speed of 950rpm for 27min, adding 1.3 parts of SBS modified asphalt, and stirring at the stirring speed of 740rpm for 17 min;
s4, adding 0.6 part of fly ash and 0.12 part of defoaming agent into the mixing cylinder in the step S3, and continuously stirring and mixing until the mixture is uniform to obtain the recycled asphalt concrete, wherein the discharging temperature is 160-170 ℃.
Example 4: the high-binding regenerated asphalt concrete is prepared by the following steps:
s1, drying and stirring 79 parts of mixed aggregate, 9 parts of steel slag, 6.5 parts of reinforcing fiber, 7 parts of filler, 6.5 parts of rubber powder and 6.5 parts of graphene in a drying barrel, setting the temperature at 93 ℃, the time at 36min and the stirring speed at 1150rpm, and stirring and mixing to obtain a dried mixed material, wherein the mass ratio of the new aggregate to the regenerated aggregate is 2:1.2, and the regenerated aggregate is prepared in preparation example 4; the novel aggregate mainly comprises limestone with the particle size ranges of 0-3 mm, 3-5 mm, 5-13 mm, 13-20 mm and 20-25 mm in a weight ratio of 2.1:3.4:7.4:1.5: 4.1;
s2, adding the dry mixture obtained in the step S1 into a mixing cylinder, heating 3 parts of SBS modified asphalt to 151 ℃, uniformly adding the SBS modified asphalt into the mixing cylinder within 23S, and stirring at the stirring speed of 1230 rpm;
s3, preheating 23.5 parts of the old regenerated asphalt mixture, adding the preheated old regenerated asphalt mixture and 0.21 part of a regenerant into a mixing cylinder in the step S2, stirring, keeping the temperature at 166 ℃, the stirring speed at 1050rpm for 28min, adding 1.5 parts of SBS modified asphalt, and stirring, wherein the stirring speed is 760rpm and the stirring time is 18 min;
s4, adding 0.65 part of fly ash and 0.13 part of defoaming agent into the mixing cylinder in the step S3, and continuously stirring and mixing until the mixture is uniform to obtain the recycled asphalt concrete, wherein the discharging temperature is 160-170 ℃.
Example 5: the high-binding regenerated asphalt concrete is prepared by the following steps:
s1, drying and stirring 81 parts of mixed aggregate, 11 parts of steel slag, 7 parts of reinforcing fiber, 8 parts of filler, 7 parts of rubber powder and 7 parts of graphene in a drying barrel, setting the temperature at 98 ℃, the time at 38min and the stirring speed at 1200rpm, and stirring and mixing to obtain a dried mixture, wherein the mass ratio of the new aggregate to the regenerated aggregate is 2:1.3, and the regenerated aggregate is prepared in preparation example 5; the novel aggregate mainly comprises limestone with the particle size ranges of 0-3 mm, 3-5 mm, 5-13 mm, 13-20 mm and 20-25 mm in a weight ratio of 2.4:3.7:7.7:1.5: 4.3;
s2, adding the dry mixture obtained in the step S1 into a mixing cylinder, heating 3.3 parts of SBS modified asphalt to 153 ℃, uniformly adding the mixture into the mixing cylinder within 24S, and stirring at 1240 rpm;
s3, preheating 24 parts of the old regenerated asphalt mixture, adding the preheated old regenerated asphalt mixture and 0.23 part of a regenerant into a mixing cylinder in the step S2, stirring at 153 ℃ for 29min, adding 1.7 parts of SBS modified asphalt, and stirring at 780rpm for 19 min;
s4, adding 0.7 part of fly ash and 0.14 part of defoaming agent into the mixing cylinder in the step S3, and continuously stirring and mixing until the mixture is uniform to obtain the recycled asphalt concrete, wherein the discharging temperature is 160-170 ℃.
Example 6: the high-binding regenerated asphalt concrete is prepared by the following steps:
s1, drying and stirring 83 parts of mixed aggregate, 12 parts of steel slag, 8 parts of reinforcing fiber, 9 parts of filler, 8 parts of rubber powder and 7.5 parts of graphene in a drying barrel, setting the temperature at 103 ℃, the time at 40min and the stirring speed at 1250rpm, and stirring and mixing to obtain a dried mixed material, wherein the mass ratio of the new aggregate to the regenerated aggregate is 2:1.4, and the regenerated aggregate is prepared in preparation example 6; the novel aggregate mainly comprises limestone with the particle size ranges of 0-3 mm, 3-5 mm, 5-13 mm, 13-20 mm and 20-25 mm in a weight ratio of 2.6:3.9:8:1.5: 4.4;
s2, adding the dry mixture obtained in the step S1 into a mixing cylinder, heating 4 parts of SBS modified asphalt to 155 ℃, uniformly adding the SBS modified asphalt into the mixing cylinder within 25S, and stirring at the stirring speed of 1250 rpm;
s3, preheating 25 parts of the old regenerated asphalt mixture, adding the preheated old regenerated asphalt mixture and 0.24 part of a regenerant into a mixing cylinder in the step S2, stirring at the temperature of 168 ℃ at the stirring speed of 1200rpm for 30min, adding 2 parts of SBS modified asphalt, and stirring at the stirring speed of 700-800 rpm for 20 min;
s4, adding 0.8 part of fly ash and 0.15 part of defoaming agent into the mixing cylinder in the step S3, and continuously stirring and mixing until the mixture is uniform to obtain the recycled asphalt concrete, wherein the discharging temperature is 160-170 ℃.
Example 7: the high-binding regenerated asphalt concrete is prepared by the following steps:
s1, drying and stirring 88 parts of mixed aggregate, 13 parts of steel slag, 9 parts of reinforcing fiber, 10 parts of filler, 9 parts of rubber powder and 8 parts of graphene in a drying barrel, setting the temperature at 110 ℃, the time at 45min and the stirring speed at 1000-1250 rpm, stirring and mixing to obtain a dried mixture, wherein the mass ratio of the new aggregate to the regenerated aggregate is 2:1.5, and the regenerated aggregate is prepared in preparation example 6; the novel aggregate mainly comprises limestone with the particle size ranges of 0-3 mm, 3-5 mm, 5-13 mm, 13-20 mm and 20-25 mm in a weight ratio of 2.8:4.3:8.5:1.5: 4.5;
s2, adding the dry mixture obtained in the step S1 into a mixing cylinder, heating 4.7 parts of SBS modified asphalt to 160 ℃, uniformly adding the SBS modified asphalt into the mixing cylinder within 25S, and stirring at the stirring speed of 1250 rpm;
s3, preheating 26 parts of the old regenerated asphalt mixture, adding the preheated old regenerated asphalt mixture and 0.25 part of regenerant into a mixing cylinder in the step S2, stirring at the temperature of 170 ℃ for 30min at the stirring speed of 1200rpm, and adding 2.3 parts of SBS modified asphalt for stirring at the stirring speed of 800rpm for 20 min;
s4, adding 0.9 part of fly ash and 0.15 part of defoaming agent into the mixing cylinder in the step S3, and continuously stirring and mixing until the mixture is uniform to obtain the recycled asphalt concrete, wherein the discharging temperature is 160-170 ℃.
Comparative example 1: a high-binding regenerated asphalt concrete is different from the regenerated asphalt concrete in example 1 in that fly ash is not added.
Comparative example 2: a high-binding regenerated asphalt concrete is different from the regenerated asphalt concrete in example 1 in that no reinforcing fiber is added.
Comparative example 3: a high-binding recycled asphalt concrete is different from the recycled asphalt concrete in example 1 in that no filler is added.
Performance testing
Test samples: the recycled asphalt concrete obtained in examples 1 to 7 was used as test samples 1 to 7, and the recycled asphalt concrete obtained in comparative examples 1 to 3 was used as control samples 1 to 3.
The test method comprises the following steps: selecting the asphalt concrete of example 1, making a standard sample according to the specification of test regulations of road engineering asphalt and asphalt mixtures (JTJ052-2000), aging the standard sample in a constant-temperature aging test box for 8 hours at the temperature of 60 ℃, then respectively adhering the standard sample of the asphalt concrete and the recycled asphalt concrete together by using the test samples 1-7 and the reference samples 1-3 according to technical Specifications for road asphalt pavement construction (JTG F40-2004), and curing and molding to obtain a test block. And measuring the connection strength between the asphalt concrete standard sample and the recycled asphalt concrete in the test blocks corresponding to the test samples 1-7 and the control samples 1-3 by using an electronic universal testing machine.
And (3) testing results: the test results of the test samples 1 to 7 and the control samples 1 to 3 are shown in Table 2. As can be seen from Table 2, the joint strength of the test samples 1-7 is superior to that of the control sample, which indicates that the fly ash, the reinforcing fiber and the filler added in the invention can significantly improve the joint strength between the recycled asphalt concrete and the old asphalt concrete during splicing.
TABLE 2 test results of test samples 1 to 7 and control samples 1 to 3
The present embodiment is only for explaining the patent of the present invention, and it is not limited to the patent of the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as required after reading the present specification, but all are protected by the patent law within the scope of the claims of the present patent.
Claims (10)
1. The high-binding-property recycled asphalt concrete is characterized by comprising the following components in parts by weight: 73-88 parts of mixed aggregate, 3-7 parts of SBS modified asphalt, 0.5-0.9 part of fly ash, 22-26 parts of regenerated asphalt mixed old material, 0.15-0.25 part of regenerant, 0.1-0.15 part of defoamer, 5-13 parts of steel slag, 5-9 parts of reinforcing fiber and 5-10 parts of filler.
2. The high-binding regenerated asphalt concrete according to claim 1, characterized in that: the high-binding-property recycled asphalt concrete also comprises 5-9 parts by weight of fluororubber powder, and the particle size of the fluororubber powder is 80-200 meshes.
3. The high-binding regenerated asphalt concrete according to claim 1, characterized in that: the high-binding-property recycled asphalt concrete also comprises 5-8 parts by weight of graphene.
4. The high-binding regenerated asphalt concrete according to claim 1, characterized in that: the mixed aggregate comprises new aggregate and regenerated aggregate in a mass ratio of 2 (1-1.5).
5. The high-binding regenerated asphalt concrete according to claim 4, wherein: the new aggregate is mainly composed of limestone with the particle size ranges of 0-3 mm, 3-5 mm, 5-13 mm, 13-20 mm and 20-25 mm according to the weight portion ratio of (1.2-2.8), (2.5-4.3), (6.5-8.5) and (3.5-4.5).
6. The high-binding regenerated asphalt concrete according to claim 4, wherein: the preparation method of the recycled aggregate comprises the following steps:
s1, throwing the waste concrete blocks into a jaw crusher to be crushed;
s2, screening crushed concrete slag and particles, and grading for the first time;
s3, washing the screened waste concrete particles with water and airing;
s4, carrying out secondary screening on the dried concrete particles to form recycled coarse aggregate with the particle size of 5-8 mm;
s5, mixing 5-10 parts of reinforcing modifier and water according to the mass ratio of 2:3 to form reinforcing slurry, respectively adding the regenerated coarse aggregate into the reinforcing slurry according to the solid-liquid mass ratio of 3:1, stirring and mixing for 10-20 min, and filtering and airing the regenerated coarse aggregate before the slurry is initially set to obtain the regenerated aggregate.
7. The recycled asphalt concrete with high bonding property of claim 6, wherein the reinforcing modifier in the step S5 comprises PVA and sodium silicate in a mass ratio of 1:1.
8. The high-binding regenerated asphalt concrete according to claim 1, characterized in that: the reinforcing fibres are preferably one or more of lignin fibres, brucite fibres and sepiolite fibres.
9. The high-binding regenerated asphalt concrete according to claim 1, characterized in that: the filler comprises one or more of carbon black, nano titanium oxide, nano silicon oxide and nano kaolin.
10. The preparation process of the high-binding regenerated asphalt concrete according to any one of claims 1 to 9, characterized by comprising the following steps:
s1, drying and stirring the mixed aggregate, the steel slag, the reinforced fiber and the filler in corresponding weight parts in a drying barrel, setting the temperature to be 78-110 ℃, the time to be 30-45 min and the stirring speed to be 1000-1250 rpm, and stirring and mixing to obtain a dried mixture;
s2, adding the dry mixture prepared in the step S1 into a mixing cylinder, heating two thirds of SBS modified asphalt to 145-160 ℃, uniformly adding the SBS modified asphalt into the mixing cylinder within 20-25S, and stirring at the stirring speed of 1200-1250 rpm;
s3, preheating the used regenerated asphalt mixture, adding the preheated regenerated asphalt mixture and a regenerant into a mixing cylinder in the step S2, stirring, keeping the temperature at 160-170 ℃, the stirring speed at 800-1200 rpm for 25-30 min, adding the rest parts by weight of SBS modified asphalt, and stirring at 700-800 rpm for 15-20 min;
s4, adding the fly ash and the defoaming agent into the mixing cylinder in the step S3, and continuously stirring and mixing until the mixture is uniform to obtain the recycled asphalt concrete, wherein the discharging temperature is 160-170 ℃.
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Application publication date: 20200410 |