CN113105160A - Asphalt pavement material for purifying road runoff pollution and preparation method and application thereof - Google Patents
Asphalt pavement material for purifying road runoff pollution and preparation method and application thereof Download PDFInfo
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- CN113105160A CN113105160A CN202110243377.XA CN202110243377A CN113105160A CN 113105160 A CN113105160 A CN 113105160A CN 202110243377 A CN202110243377 A CN 202110243377A CN 113105160 A CN113105160 A CN 113105160A
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Images
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
- E01C7/26—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre
-
- 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
Abstract
The asphalt pavement material for purifying the runoff pollutants of the roads comprises asphalt, diatomite and graded aggregate, wherein the volume ratio of the asphalt to the diatomite is 1 (0.33-0.35), and the mass ratio of the sum of the mass of the asphalt and the diatomite to the mass of the graded aggregate is (0.04-0.06): 1. The preparation method of the asphalt pavement material comprises the following steps: heating and melting asphalt, and respectively heating and drying the diatomite and the graded aggregate; and (3) uniformly mixing the asphalt, the diatomite and the graded aggregate, compacting in a mould by using a compacting instrument, and standing to obtain the porous asphalt pavement material. The invention can realize the in-situ purification of runoff pollution, has the composite purification function of physical interception-chemical adsorption, obviously improves the purification effect of heavy metal pollutants of copper, chromium, iron, total nitrogen pollutants and total phosphorus pollutants, can bear certain traffic load and ensures good road performance.
Description
Technical Field
The invention belongs to the technical field of water purification performance of permeable pavements and pavement material mechanics, and relates to an asphalt pavement material for purifying road runoff pollutants and improving pavement performance, and preparation and application thereof.
Background
Under the influence of comprehensive factors such as urban traffic emission, snow-melting agent spreading, atmospheric sedimentation, human activities and the like, a large amount of pollutants are gathered on the surface of the road and are wrapped by runoff under the rainfall condition to form road runoff pollution, so that serious environmental threats are caused to rivers, soil, underground water and the like around the city. The porous asphalt pavement material is provided with abundant pore structures, can filter, intercept and adsorb partial runoff pollutants when runoff passes through, and has a certain purification effect. However, the purification capacity of porous asphalt pavement materials is very limited due to the traffic carrying capacity of the pavement materials.
Disclosure of Invention
The invention aims to provide a preparation method and application of a porous diatomite asphalt pavement material for purifying road runoff pollutants, wherein the asphalt pavement material is a porous asphalt pavement material containing diatomite and graded aggregates, has high-efficiency water purification capacity and can bear traffic load.
The purpose of the invention can be realized by the following technical scheme:
the porous diatomite asphalt pavement material for purifying the road runoff pollutants comprises asphalt, diatomite and graded aggregate. It should be noted that the amount of the diatomite material has a significant influence on the pavement performance of the asphalt pavement material. Generally, the requirement of the filler content range in the grading design is 2.0-6.0%, and no further strict limitation is imposed on the filler content range, so that the pavement performance of the pavement material designed by the method is different. Therefore, based on a large amount of research data and experimental verification, the optimal mixing amount range of the diatomite recommended by the invention is obtained: the volume ratio of the asphalt to the diatomite is 1 (0.33-0.35), and the mass ratio of the sum of the mass of the asphalt and the red mud to the mass of the graded aggregate is 0.04-0.06) to 1. Within the range, the prepared material can ensure the optimal comprehensive road performance (including anti-flying performance, water stability and ageing resistance).
Preferably, the asphalt is high-viscosity modified asphalt, and the viscosity of the high-viscosity asphalt is more than 20000 Pa-s. The high-viscosity asphalt is adopted in the porous asphalt pavement, because the porous asphalt pavement is more prone to pavement diseases such as loosening and stripping compared with the traditional asphalt pavement, the high-viscosity asphalt is required to provide stronger adhesion performance, and the pavement performance is improved.
Further, the diatomite has a particle size of 1-75 μm and a specific gravity of 1.90-2.30 g/cm3Porosity by dry pressing>40 percent. The diatomite powder is rich in silicon dioxide, sodium element, potassium element and a small amount of titanium dioxide.
Preferably, the diatomite is preferably modified diatomite, and the modified diatomite is obtained by grinding the diatomite on the premise of not damaging a diatom shell and grinding raw material particles to strip off mineral impurities solidified on the shell, so that the content of silicon dioxide is increased, the surface adsorption capacity of the silicon dioxide is enhanced, and the purification effect is further improved.
Furthermore, the aggregate in the graded aggregate is basalt.
Further, in the graded aggregate, the particle size distribution of the aggregate is as follows: the passing rate (namely the ratio of the passing mass to the total mass) of the aggregates corresponding to the 0.075mm sieve pore is 4-6%, the passing rate of the aggregates corresponding to the 0.15mm sieve pore is 6-7%, the passing rate of the aggregates corresponding to the 0.3mm sieve pore is 7.5-8.5%, the passing rate of the aggregates corresponding to the 0.6mm sieve pore is 10-11%, the passing rate of the aggregates corresponding to the 1.18mm sieve pore is 12-13%, the passing rate of the aggregates corresponding to the 2.36mm sieve pore is 14-15%, the passing rate of the aggregates corresponding to the 4.75mm sieve pore is 19-25%, the passing rate of the aggregates corresponding to the 9.5mm sieve pore is 60-75%, the passing rate of the aggregates corresponding to the 13.2mm sieve pore is 90-95%, and the passing rate of the aggregates corresponding to the 16mm sieve pore. This grading mode has a significant physical filtration and retention of contaminants.
The preparation method of the porous diatomite asphalt pavement material for purifying the road runoff pollutants comprises the following steps:
1) heating and melting asphalt, and respectively heating and drying the diatomite and the graded aggregate;
2) and (3) uniformly mixing the asphalt, the diatomite and the graded aggregate, compacting in a mould by using a compacting instrument, and standing to obtain the asphalt pavement material test piece.
Further, in the step 1), the heating and melting temperature is 180-.
Further, in the step 2), the standing time is 20-30 h.
The porous diatomite asphalt pavement material is applied to road pavements, and road runoff pollutants penetrating through the material are purified in situ. Road runoff contaminants include heavy metal copper (Cu), heavy metal chromium (Cr), heavy metal iron (Fe), Total Nitrogen (TN), and Total Phosphorus (TP) contaminants.
The diatomite is a biogenic siliceous sedimentary rock, has abundant pore structures on the surface and large specific surface area, has obvious physical and chemical purification effects on partial organic matters and heavy metal ions, but has no application of doping the diatomite into porous asphalt pavement materials to purify road runoff pollutants at present.
Therefore, the invention provides a porous asphalt pavement material containing diatomite, wherein the natural porous structure of the diatomite ensures a larger specific surface area, the surface of the diatomite simultaneously has a large number of functional groups, namely silicon hydroxyl groups, and the hydroxyl groups have better reaction activity, namely show stronger adsorption performance. Generally, the adsorption mechanism of diatomaceous earth to heavy metal ions in water is physical adsorption (by virtue of van der waals and coulomb forces) and chemical adsorption (by ion exchange), and adsorption to organic pollutants such as Total Phosphorus (TP) and Total Nitrogen (TN) is mainly chemical adsorption. The test result shows that compared with the common porous asphalt pavement material, the porous asphalt pavement material has very obvious purification effect on road runoff pollutants.
The diatomite is adopted as the filler in the porous asphalt pavement material, and the reasons are as follows: 1. the purification performance of the porous asphalt pavement material can be obviously improved by adding the diatomite; 2. when the diatomite is used as a filler in the porous asphalt pavement material, the pavement performances of the porous asphalt pavement material, such as anti-scattering, anti-rutting, anti-aging and the like, can be obviously improved, and the traffic bearing capacity is ensured.
Compared with the prior art, the invention has the following characteristics:
1) the porous diatomite asphalt pavement material has good comprehensive pavement performance. Based on the physicochemical properties of the diatomite, the optimal diatomite mixing amount range is provided to meet the following requirements: the volume ratio of the asphalt to the diatomite is 1 (0.33-0.35), the mass ratio of the sum of the mass of the asphalt and the red mud to the mass of the graded aggregate is 0.04-0.06) to 1, and the good anti-scattering performance, water stability and anti-aging comprehensive pavement performance of the material are ensured.
2) The porous diatomite asphalt pavement material has a physical purification effect. The special grading design of the asphalt pavement material ensures a macroscopic macroporous structure and has obvious physical interception and filtration effects on road runoff pollutants. The diatomite powder is mixed, so that the micro-pore structure and the specific surface area of a common asphalt pavement material can be improved and enriched, and the physical filtration effect on radial pollutants is improved.
3) The porous diatomite asphalt pavement material has a chemical purification effect. The surface of the diatomite has a large number of functional groups, namely silicon hydroxyl groups, and the hydroxyl groups have good reaction activity, namely show strong chemical adsorption performance. Generally, the adsorption mechanism of diatomaceous earth to heavy metal ions in water is physical adsorption (by van der waals force and coulomb force) and chemical adsorption (by ion exchange), and adsorption to organic substances such as Total Phosphorus (TP) and Total Nitrogen (TN) is mainly chemical adsorption.
4) Compared with the common porous asphalt pavement material, the porous diatomite asphalt pavement material has the advantages that the purification effect of heavy metal copper (Cu) pollutants, heavy metal chromium (Cr) pollutants, heavy metal iron (Fe) pollutants, total nitrogen pollutants (TN) and total phosphorus pollutants (TP) is obviously improved.
Drawings
FIG. 1 is a design diagram of the optimum mixing amount range of diatomite in the embodiment of the invention.
Fig. 2 is a schematic view of the home-made asphalt mixture infiltration apparatus used in the present invention.
FIG. 3 is a graph showing the overall comparison of the pollutant purification effects of the porous diatomaceous earth asphalt pavement materials of the examples and comparative examples of the present invention with those of the conventional materials.
Detailed Description
The invention provides a preparation method and application of a porous diatomite asphalt pavement material for purifying road runoff pollution.
[ METHOD FOR PREPARING MATERIAL ]
Diatomaceous earth is a siliceous sedimentary rock formed by biomineralization. The diatomite adopted by the embodiment of the invention is produced in Jilin province, Baishan City, Jilin province, the particle size is distributed between 1 and 75 mu m, and the specific gravity is 2.08g/cm3The dry-pressed porosity was 52.8%. The diatomite is preferably modified diatomite, and the modified diatomite is obtained by grinding the diatomite on the premise of not damaging a diatom shell, and grinding into fine raw material particles so as to strip off mineral impurities solidified on the shell, improve the content of silicon dioxide and enhance the surface adsorption capacity of the diatomite. The main physical and chemical indexes are shown in table 1.
TABLE 1 Main physicochemical indices of modified diatomaceous Earth
The raw materials used in this example were as follows:
asphalt: the domestic high-viscosity asphalt is widely applied to porous asphalt pavements at present, and the technical indexes meet the technical requirements of road asphalt pavement construction technical Specification JTGF 40-2004;
limestone mineral powder: the technical indexes of the powder obtained by grinding limestone meet the technical requirements of technical Specification for construction of asphalt road surfaces for roads JTGF 40-2004;
diatomite: the main mineral composition is opal, and contains clay (kaolinite), carbonaceous (organic matter), carbonate mineral (calcite and dolomite), and the like, and the specific technical indexes are shown in table 1.
Aggregate: the grading of the basalt aggregate is shown in table 2, and the grading design reflects the grain size and the proportion of the aggregate.
TABLE 2 grading design of basalt aggregates (established according to the scope of claim 6)
Preparing an asphalt mixture (0.04-0.06, 0.05) according to 1 volume part of domestic high-viscosity asphalt, 0.33 volume part (0.33-0.35, 0.33) of diatomite and 5 percent of oilstone,
the preparation method of the mixture is carried out according to road engineering asphalt and asphalt mixture test procedures (JTG E20-2011), and the preparation and application steps are as follows:
a) the high-viscosity asphalt is heated to 185 ℃, and because the asphalt used is high-viscosity asphalt, a higher temperature is required to be ensured in the preparation of the mucilage, and the temperature is set to 185 ℃.
b) And heating and preserving the diatomite powder in an oven at 180 ℃ for 60 +/-5 min to ensure that the filler is dried and the heating temperature is close to that of the asphalt.
c) Adding the prepared dry basalt aggregate according to the grading design into a stirring pot, uniformly stirring, adding asphalt mucilage, stirring for 90s, adding diatomite powder, stirring for 90s, pouring the uniformly stirred asphalt mixture into a Marshall mold (the diameter is 101.6mm), compacting by using a compacting instrument, standing for 24 hours, and demolding.
[ laboratory simulation road runoff pollutants ]
Road runoff pollutants were simulated in a laboratory in an artificially synthesized manner based on field survey results of pollutant concentrations, the pollutants including: heavy metal copper (Cu) contaminants, heavy metal chromium (Cr) contaminants, heavy metal iron (Fe) contaminants, total nitrogen contaminants (TN), and total phosphorus contaminants (TP). The configuration process of the simulated road runoff pollutants comprises the following steps:
1. heavy metal copper (Cu): 10.0ml of copper element standard stock solution (100 mu g/ml) is transferred into a 1000ml volumetric flask and diluted to a marked line by deionized water, thus obtaining the simulated runoff containing 1mg/L of heavy metal Cu.
2. Heavy metal chromium (Cr): 10.0ml of chromium element standard stock solution (10 mu g/ml) is transferred into a 1000ml volumetric flask and diluted by deionized water to the surface mark line, thus obtaining the simulated runoff containing 0.1mg/L of heavy metal Cr.
3. Transferring 40.0ml of standard stock solution (10 microgram/ml) of iron element into a 1000ml volumetric flask, and diluting with deionized water to the surface marked line to obtain simulated runoff containing 0.4mg/L of heavy metal Fe.
4. Total Nitrogen (TN): 15.0ml of total nitrogen standard stock solution (1000 mug/ml) is transferred into a 1000ml volumetric flask and diluted with deionized water to the surface mark line, thus obtaining the simulated runoff containing 15mg/L of total nitrogen TN.
5. Total Phosphorus (TP): 10.0ml of total nitrogen standard stock solution (1000 mug/ml) is transferred into a 1000ml volumetric flask and diluted by deionized water to the surface mark line, thus obtaining the simulated runoff containing 10mg/L of total phosphorus TP.
The invention will be further described with reference to an embodiment shown in the drawings.
Example 1
1) A prepared porous diatomite asphalt mixture test piece (diameter 101.6mm and height 6.4cm) is placed in a self-made asphalt mixture infiltration device.
2) Enabling the prepared simulated runoff solution of the heavy metal Cu to pass through a percolation device at the speed of 200ml/min, collecting a filtered water sample through a water valve below the percolation device, and storing the water sample in a cleaned sampling bottle.
3) And (4) storing the percolation water sample in a biochemical incubator at 4 ℃ for subsequent water sample testing.
Comparative example 1
1) And placing the prepared porous common asphalt mixture test piece (the diameter is 101.6mm, and the height is 6.4cm) in a self-made asphalt mixture infiltration device.
2) Enabling the prepared simulated runoff solution of the heavy metal Cu to pass through a percolation device at the speed of 200ml/min, collecting a filtered water sample through a water valve below the percolation device, and storing the water sample in a cleaned sampling bottle.
3) And (4) storing the percolation water sample in a biochemical incubator at 4 ℃ for subsequent water sample testing.
Example 2
1) A prepared porous diatomite asphalt mixture test piece (diameter 101.6mm and height 6.4cm) is placed in a self-made asphalt mixture infiltration device.
2) Enabling the prepared simulated runoff solution of the heavy metal Cr to pass through the percolation device at the speed of 200ml/min, collecting a filtered water sample through a water valve below the percolation device, and storing the water sample in a cleaned sampling bottle.
3) And (4) storing the percolation water sample in a biochemical incubator at 4 ℃ for subsequent water sample testing.
Comparative example 2
1) And placing the prepared porous common asphalt mixture test piece (the diameter is 101.6mm, and the height is 6.4cm) in a self-made asphalt mixture infiltration device.
2) Enabling the prepared simulated runoff solution of the heavy metal Cr to pass through the percolation device at the speed of 200ml/min, collecting a filtered water sample through a water valve below the percolation device, and storing the water sample in a cleaned sampling bottle.
3) And (4) storing the percolation water sample in a biochemical incubator at 4 ℃ for subsequent water sample testing.
Example 3
1) A prepared porous diatomite asphalt mixture test piece (diameter 101.6mm and height 6.4cm) is placed in a self-made asphalt mixture infiltration device.
2) Enabling the prepared simulated runoff solution of the heavy metal Fe to pass through the percolation device at the speed of 200ml/min, collecting a filtered water sample through a water valve below the percolation device, and storing the water sample in a cleaned sampling bottle.
3) And (4) storing the percolation water sample in a biochemical incubator at 4 ℃ for subsequent water sample testing.
Comparative example 3
1) And placing the prepared porous common asphalt mixture test piece (the diameter is 101.6mm, and the height is 6.4cm) in a self-made asphalt mixture infiltration device.
2) Enabling the prepared simulated runoff solution of the heavy metal Fe to pass through the percolation device at the speed of 200ml/min, collecting a filtered water sample through a water valve below the percolation device, and storing the water sample in a cleaned sampling bottle.
3) And (4) storing the percolation water sample in a biochemical incubator at 4 ℃ for subsequent water sample testing.
Example 4
1) A prepared porous diatomite asphalt mixture test piece (diameter 101.6mm and height 6.4cm) is placed in a self-made asphalt mixture infiltration device.
2) The prepared simulated runoff solution of the total nitrogen TN passes through the percolation device at the speed of 200ml/min, and a water sample after filtration is collected by a water valve below the percolation device and stored in a cleaned sampling bottle.
3) And (4) storing the percolation water sample in a biochemical incubator at 4 ℃ for subsequent water sample testing.
Comparative example 4
1) And placing the prepared porous common asphalt mixture test piece (the diameter is 101.6mm, and the height is 6.4cm) in a self-made asphalt mixture infiltration device.
2) The prepared simulated runoff solution of the total nitrogen TN passes through the percolation device at the speed of 200ml/min, and a water sample after filtration is collected by a water valve below the percolation device and stored in a cleaned sampling bottle.
3) And (4) storing the percolation water sample in a biochemical incubator at 4 ℃ for subsequent water sample testing.
Example 5
1) A prepared porous diatomite asphalt mixture test piece (diameter 101.6mm and height 6.4cm) is placed in a self-made asphalt mixture infiltration device.
2) The prepared simulated runoff solution of the total phosphorus TP passes through the percolation device at the speed of 200ml/min, and a water sample after filtration is collected by a water valve below the percolation device and stored in a cleaned sampling bottle.
3) And (4) storing the percolation water sample in a biochemical incubator at 4 ℃ for subsequent water sample testing.
Comparative example 5
1) And placing the prepared porous common asphalt mixture test piece (the diameter is 101.6mm, and the height is 6.4cm) in a self-made asphalt mixture infiltration device.
2) The prepared simulated runoff solution of the total phosphorus TP passes through the percolation device at the speed of 200ml/min, and a water sample after filtration is collected by a water valve below the percolation device and stored in a cleaned sampling bottle.
3) And (4) storing the percolation water sample in a biochemical incubator at 4 ℃ for subsequent water sample testing.
[ Water quality testing experiment ]
The experiment was conducted to test the water quality of the percolated water samples obtained in the examples and comparative examples and to compare the water quality results. The test methods are shown in table 3. And (3) measuring the specific content of each pollutant index of the collected filtered water sample by using an HACH-DR3900 spectrophotometer, a DRB200 digestion device and an HACH prefabricated reagent. And (3) calculating the removal rate of the pollutants by using the difference of the concentrations of the pollutants in the inlet water and the outlet water and dividing the difference by the concentration of the pollutants in the inlet water (formula 1).
TABLE 3 pollutant index and detection method thereof
As can be seen from fig. 3, the removal rates of the common porous asphalt pavement material for heavy metals Cu, Cr, Fe and organic pollutants TN, TP are respectively: 0%, 13%, 5.2%, 17%, 3%. The removal rates of the porous diatomite asphalt pavement material to heavy metals Cu, Cr and Fe and organic pollutants TN and TP are respectively as follows: 15.6%, 66.7%, 18.6%, 38%, 20%.
Wherein, for heavy metal ion contaminants: the common porous asphalt mixture has almost no purification effect on heavy metal Cu, and the removal rate of the porous diatomite asphalt mixture on Cu reaches 15.6%; the common porous asphalt mixture has the removal rate of heavy metal Cr only 13%, and the removal rate of the porous diatomite asphalt mixture to Cr reaches 66.7%; the removal rate of the common porous asphalt mixture to heavy metal Fe is only 5.2%, and the removal rate of the porous diatomite asphalt mixture to Cr reaches 18.6%. The comparison shows that the purification effect of the porous diatomite asphalt mixture on various heavy metal ion pollutants is improved by 3-5 times compared with that of the common porous asphalt mixture.
For organic contaminants: the removal rate of the common porous asphalt mixture to total nitrogen TN is 17%, and the removal rate of the porous diatomite asphalt mixture to TN reaches 38%; the common porous asphalt mixture only has 3% of purification effect on the total phosphorus TP, and the removal rate of the porous diatomite asphalt mixture on the total phosphorus TP reaches 20%. The comparison shows that the purification effect of the porous diatomite asphalt mixture on various organic pollutants is improved by 2-6 times compared with the common porous asphalt mixture.
The physical purification mechanism is as follows: the porous diatomite pavement material is purified by virtue of physical adsorption, interception and filtration through abundant microscopic pores and a larger specific surface area inside the porous diatomite pavement material; the chemical purification mechanism: the diatomite has a large number of functional groups of silicon hydroxyl on the surface, shows strong chemical adsorption performance, mainly removes heavy metal ion pollutants through chemical ion exchange, and mainly purifies TP, TN and other organic matters through chemical adsorption.
In a word, compared with the addition of ordinary limestone mineral powder, the addition of the diatomite as the filler can obviously improve the purification effect of the porous asphalt mixture on heavy metals Cu, Cr and Fe and organic pollutants TN and TP, and particularly greatly improve the purification effect on the total nitrogen of the heavy metal pollutants Cu, Cr and organic pollutants. Therefore, when the asphalt pavement material is used for in-situ purification of road runoff pollutants, the purification effect of the porous asphalt pavement material can be directly and effectively improved, and the asphalt pavement material can be applied to runoff pollution environments with different degrees and has important significance for relieving urban non-point source pollution.
[ test for road Performance verification ]
The purpose of the experiment is to verify that the porous diatomite asphalt pavement material can bear a certain traffic load and ensure good road use performance, thereby verifying the effectiveness and reliability of the porous diatomite asphalt pavement material in the application scene of a road.
The specifically verified properties include: the experimental procedures of the anti-scattering performance, the high-temperature stability, the water stability and the anti-aging performance are as follows (refer to road engineering asphalt and asphalt mixture test regulation JTG E20-2011, which is only an outline here):
1) standard fly-off test (anti-fly-off performance): and (3) placing the asphalt mixture test piece into a constant-temperature water tank (20 +/-0.5 ℃) for curing for 20 hours, placing the test piece into a los Angeles abrasion tester after the curing, covering the test piece tightly without adding a steel ball, rotating the test piece at the speed of 30-33 r/min for 300r, and calculating the scattering loss of the test piece.
2) Freeze-thaw cleavage test (water stability): and (3) completely immersing the mixture test piece placed at the normal temperature and the mixture test piece subjected to freeze-thaw cycle in a constant-temperature water tank at the temperature of 25 +/-0.5 ℃ for not less than 2 h. Immediately after removal, a cleavage test was carried out with a material tester at a loading rate of 50 mm/min.
3) Aging fly-off test (aging resistance): the test pieces of the mixture were first subjected to a long-term aging at 85 ℃ for 5 days and to the standard fly-away test described in 1).
Example 1
The porous diatomite asphalt pavement material for purifying runoff pollutants comprises asphalt, diatomite and graded aggregate, wherein the volume ratio of the asphalt to the diatomite is 1:0.34, and the mass ratio of the sum of the asphalt and the diatomite to the graded aggregate is 0.06: 1. Wherein the asphalt is high-viscosity asphalt, and the viscosity of the high-viscosity asphalt is 20000 Pa.s. The diatomite has a particle size of 1-75 μm and a specific gravity of 2.08g/cm3The dry-pressed porosity was 52.8%. The diatomite contains silicon dioxide, sodium element, potassium element and a small amount of titanium dioxide.
The aggregate in the graded aggregate is basalt. In the graded aggregate, the particle size distribution of the aggregate is as follows: the passing rate (namely the ratio of the passing mass to the total mass) of the aggregates corresponding to the 0.075mm sieve pore is 4-6%, the passing rate of the aggregates corresponding to the 0.15mm sieve pore is 6-7%, the passing rate of the aggregates corresponding to the 0.3mm sieve pore is 7.5-8.5%, the passing rate of the aggregates corresponding to the 0.6mm sieve pore is 10-11%, the passing rate of the aggregates corresponding to the 1.18mm sieve pore is 12-13%, the passing rate of the aggregates corresponding to the 2.36mm sieve pore is 14-15%, the passing rate of the aggregates corresponding to the 4.75mm sieve pore is 19-25%, the passing rate of the aggregates corresponding to the 9.5mm sieve pore is 60-75%, the passing rate of the aggregates corresponding to the 13.2mm sieve pore is 90-95%, and the passing rate of the aggregates corresponding to the 16mm sieve pore.
The preparation method of the asphalt pavement material comprises the following steps:
1) heating and melting asphalt, and respectively heating and drying the red mud and the graded aggregate;
2) and (3) uniformly mixing the asphalt, the red mud and the graded aggregate, compacting by using a compaction instrument, and standing to obtain the asphalt pavement material.
In the step 1), the heating and melting temperature is 195 ℃, the heating and drying temperature is 185 ℃, and the heating and drying time is 55 min.
In the step 2), the standing time is 30 h.
The asphalt pavement material is laid on the road, and road runoff pollutants penetrating through the material are purified.
Example 2
The porous diatomite asphalt pavement material for purifying runoff pollutants comprises asphalt, diatomite and graded aggregate, wherein the volume ratio of the asphalt to the diatomite is 1:0.34, and the mass ratio of the sum of the asphalt and the diatomite to the graded aggregate is 0.04: 1.
Wherein the asphalt is high-viscosity asphalt, and the viscosity of the high-viscosity asphalt is 20000 Pa.s.
The diatomite has a particle size of 1-75 μm and a specific gravity of 2.08g/cm3The dry-pressed porosity was 52.8%. The diatomite contains silicon dioxide, sodium element, potassium element and a small amount of titanium dioxide.
The aggregate in the graded aggregate is basalt. In the graded aggregate, the particle size distribution of the aggregate is as follows: the aggregate passing rate that 0.075mm sieve mesh corresponds is 5%, the aggregate passing rate that 0.15mm sieve mesh corresponds is 7%, the aggregate passing rate that 0.3mm sieve mesh corresponds is 8.3%, the aggregate passing rate that 0.6mm sieve mesh corresponds is 10.8%, the aggregate passing rate that 1.18mm sieve mesh corresponds is 12.7%, the aggregate passing rate that 2.36mm sieve mesh corresponds is 14.8%, the aggregate passing rate that 4.75mm sieve mesh corresponds is 23.4%, the aggregate passing rate that 9.5mm sieve mesh corresponds is 61.3%, the aggregate passing rate that 13.2mm sieve mesh corresponds is 90.1%, the aggregate passing rate that 16mm sieve mesh corresponds is 100%.
The preparation method of the asphalt pavement material comprises the following steps:
1) heating and melting asphalt, and respectively heating and drying the red mud and the graded aggregate;
2) and (3) uniformly mixing the asphalt, the red mud and the graded aggregate, compacting by using a compaction instrument, and standing to obtain the asphalt pavement material.
In the step 1), the heating and melting temperature is 180 ℃, the heating and drying temperature is 175 ℃, and the heating and drying time is 65 min.
In the step 2), the standing time is 20 h.
The asphalt pavement material is laid on the road, and road runoff pollutants penetrating through the material are purified.
The results of the road performance verification of the above examples are shown in table 4, and all meet the current standard requirements, so the recommended range of the present invention is suitable for road surface materials and has the purification effect.
TABLE 4 road Performance verification test results
The foregoing description and description of the embodiments are provided to facilitate understanding and application of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications can be made to these teachings and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above description and the description of the embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The asphalt pavement material for purifying the road runoff pollutants is characterized in that: the asphalt pavement material comprises asphalt, diatomite and graded aggregate, wherein the volume ratio of the asphalt to the diatomite is 1 (0.33-0.35), and the mass ratio of the sum of the mass of the asphalt and the diatomite to the mass of the graded aggregate is (0.04-0.06): 1.
2. The bituminous pavement material for purifying road runoff contaminants of claim 1, wherein: the asphalt is high-viscosity modified asphalt, and the viscosity of the asphalt is more than 20000 Pa.s.
3. The bituminous pavement material for purifying road runoff contaminants of claim 1, wherein: the particle size of the diatomite is 1-75 mu m, and the specific gravity is 1.90-2.30 g/cm3Porosity by dry pressing>40％。
4. The bituminous pavement material for purifying road runoff contaminants of claim 1, wherein: the diatomite powder contains silicon dioxide, sodium element, potassium element and titanium dioxide.
5. The bituminous pavement material for purifying road runoff contaminants of claim 1, wherein: the aggregate in the graded aggregate is basalt.
6. The bituminous pavement material for purifying road runoff contaminants of claim 1, wherein: in the graded aggregate, the particle size distribution of the aggregate is as follows: the passing rate of the aggregates corresponding to the 0.075mm sieve pores is 4-6%, the passing rate of the aggregates corresponding to the 0.15mm sieve pores is 6-7%, the passing rate of the aggregates corresponding to the 0.3mm sieve pores is 7.5-8.5%, the passing rate of the aggregates corresponding to the 0.6mm sieve pores is 10-11%, the passing rate of the aggregates corresponding to the 1.18mm sieve pores is 12-13%, the passing rate of the aggregates corresponding to the 2.36mm sieve pores is 14-15%, the passing rate of the aggregates corresponding to the 4.75mm sieve pores is 19-25%, the passing rate of the aggregates corresponding to the 9.5mm sieve pores is 60-75%, the passing rate of the aggregates corresponding to the 13.2mm sieve pores is 90-95%, and the passing rate of the aggregates corresponding to the 16mm sieve pores is 100%.
7. The method for preparing the asphalt pavement material for purifying the runoff pollutants of the roads as claimed in any one of claims 1 to 6, comprising the following steps of:
1) heating and melting asphalt, and respectively heating and drying the diatomite and the graded aggregate;
2) and (3) uniformly mixing the asphalt, the diatomite and the graded aggregate, compacting in a mould by using a compacting instrument, and standing to obtain the porous asphalt pavement material.
8. The method for preparing the asphalt pavement material for purifying the runoff pollutants of the roads according to claim 7, wherein the method comprises the following steps: in the step 1), the heating and melting temperature is 180-.
9. The method for preparing the asphalt pavement material for purifying the runoff pollutants of the roads according to claim 7, wherein the method comprises the following steps: in the step 2), the standing time is 20-30 h.
10. Use of an asphalt pavement material for purifying road runoff pollutants as claimed in any one of claims 1 to 6, wherein: the porous asphalt pavement material is directly applied to roads, and can realize in-situ purification of road runoff pollutants penetrating through the material while bearing vehicle load.
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| CN114235640A (en) * | 2021-12-17 | 2022-03-25 | 武汉理工大学 | Method and device for calculating length of water-gas diffusion path in asphalt mixture |
| CN115491046A (en) * | 2022-08-26 | 2022-12-20 | 长安大学 | Modified asphalt with long-acting self-cleaning function, cleaning modifier and preparation method |
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| CN115491046A (en) * | 2022-08-26 | 2022-12-20 | 长安大学 | Modified asphalt with long-acting self-cleaning function, cleaning modifier and preparation method |
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