CN109096991B - Anti-sliding fog seal material and construction method thereof - Google Patents
Anti-sliding fog seal material and construction method thereof Download PDFInfo
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- CN109096991B CN109096991B CN201810921912.0A CN201810921912A CN109096991B CN 109096991 B CN109096991 B CN 109096991B CN 201810921912 A CN201810921912 A CN 201810921912A CN 109096991 B CN109096991 B CN 109096991B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/149—Antislip compositions
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- 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
- E01C7/35—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them
- E01C7/358—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them with a combination of two or more binders according to groups E01C7/351 - E01C7/356
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Abstract
The invention provides an anti-slide fog seal material and a construction method thereof, wherein the anti-slide fog seal material comprises epoxy resin, a curing agent, emulsified asphalt, fine aggregate and a polymer modifier; the mass ratio of the epoxy resin to the curing agent to the emulsified asphalt is 3:1: 2; the fine aggregate accounts for 30-50% of the total mass of the epoxy resin, the curing agent and the emulsified asphalt; the polymer modifier accounts for 0.4-0.6% of the mass of the emulsified asphalt. The anti-skid fog sealing layer material provided by the invention can permeate into gaps of pavement aggregate and even flow into pavement pores to realize 'blood transfusion' to the pavement, so that the adhesion of pavement asphalt is recovered, tiny cracks and gaps of the pavement are filled, and the pavement is prevented from underwater seepage; meanwhile, the fine aggregate provides the anti-skid capability of the pavement, and the friction coefficient of the pavement treated by the anti-skid fog seal layer is improved. The results of the examples show that the friction coefficient of the road surface reaches above 60BPN after the road surface is subjected to surface treatment by using the anti-skid fog seal material.
Description
Technical Field
The invention relates to the technical field of highway maintenance, in particular to an anti-fog seal coat material and a construction method thereof.
Background
After the asphalt pavement is normally used for several years, the pavement has the phenomena of slight fatigue cracking and fine aggregate loss, the water seepage prevention performance of the pavement is poor, and pavement water enters the asphalt mixture through cracks or fine aggregate damage parts, so that the damage of the pavement is accelerated.
The road preventive maintenance measures with efficient maintenance performance and low cost are generally adopted at present for the fog sealing layer, the fog sealing layer material is sprayed on the surface of the road, a thin sealing layer is formed on the surface of the road, the tiny cracks and surface gaps are sealed and filled, the effects of preventing water and inhibiting the loosening of the road are achieved, and the influence of aging and weathering on the performance of the road is reduced.
At present, a lot of fog seal materials such as water-based emulsified asphalt, coal tar fog seal, organic silicon fog seal materials and the like exist at home and abroad, however, in practical engineering application, the common fog seal materials are not enough in anti-skid performance at the initial construction stage, an asphalt film is formed on a road surface after the fog seal is constructed, the surface of an asphalt film formed by asphalt is smooth, the friction force between the asphalt film and a tire is small, and the anti-skid performance of the road surface is directly reduced.
Disclosure of Invention
The invention provides an anti-slide fog seal material and a construction method thereof. The pavement constructed by the fog sealing layer material provided by the invention has better skid resistance.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides an anti-slide fog seal material, which comprises epoxy resin, a curing agent, emulsified asphalt, fine aggregate and a polymer modifier;
the mass ratio of the epoxy resin to the curing agent to the emulsified asphalt is 3:1: 2;
the mass of the fine aggregate is 30-50% of the total mass of the epoxy resin, the curing agent and the emulsified asphalt;
the mass of the polymer modifier is 0.4-0.6% of the mass of the emulsified asphalt.
Preferably, the Saebrt viscosity of the emulsified asphalt is 20-100 s; the evaporation residue of the emulsified asphalt is more than or equal to 60 wt.%.
Preferably, the preparation method of the emulsified asphalt comprises the following steps: mixing and emulsifying matrix asphalt, an emulsifier and water at 140 ℃ to obtain emulsified asphalt; the mass ratio of the matrix asphalt to the emulsifier to the water is 60: (0.4-0.6): 40.
preferably, the curing agent is an amine curing agent.
Preferably, the curing agent is epoxy curing agent T31.
Preferably, the polymer modifier comprises indulinAA 57.
Preferably, the fine aggregate is 20-40 mesh carborundum.
The invention also provides a construction method of the anti-slide fog seal material in the technical scheme, which comprises the following steps:
(1) mixing the components of the anti-slide fog seal layer material to obtain mixed slurry;
(2) and (2) under the condition that the road surface temperature and the environmental temperature of the road surface to be treated are not lower than 20 ℃, spraying at least one layer of the mixed slurry obtained in the step (1) on the road surface to be treated, and then maintaining.
Preferably, the single-layer spraying amount of the mixed slurry in the step (2) is 0.6-1.45 kg/m based on the surface area of the pavement to be surface-treated2。
Preferably, the amount of single-layer spraying of the mixed slurry in the step (2) is determined according to the amount to be treatedThe roughness of the road surface is adjusted, when the friction coefficient of the road surface to be treated is [0.4,0.5 ]]When the amount of the mixed slurry sprayed in a single layer is [0.6kg/m ]2,0.8kg/m2]；
When the friction coefficient of the road surface to be treated is (0.5,0.6), the single-layer spraying amount of the mixed slurry is (0.8 kg/m)2,1.2kg/m2)；
When the friction coefficient of the road surface after surface treatment is more than 0.60, the single-layer spraying amount of the mixed slurry is 1.2kg/m2,1.45kg/m2]。
The invention provides an anti-slide fog seal material, which comprises epoxy resin, a curing agent, emulsified asphalt, fine aggregate and a polymer modifier; wherein the mass ratio of the epoxy resin to the curing agent to the emulsified asphalt is 3:1: 2; the mass of the fine aggregate is 30-50% of the total mass of the epoxy resin, the curing agent and the emulsified asphalt; the mass of the polymer modifier is 0.4-0.6% of the mass of the emulsified asphalt. The anti-skid fog sealing layer material provided by the invention can permeate into gaps of pavement aggregate and even flow into pavement pores to realize 'blood transfusion' to the pavement, so that the adhesion of pavement asphalt is recovered, tiny cracks and gaps of the pavement are filled, and the pavement is prevented from underwater seepage; the epoxy asphalt has extremely strong adhesiveness, fine aggregates can be better bonded after being sprayed, and the bonding performance of the completely cured mixture and the original pavement is over 3MPa and is far higher than that of the traditional fog seal material and the pavement by at most 0.6 MPa. The results of the examples show that the friction coefficient of the road surface reaches above 60BPN after the road surface is subjected to surface treatment by using the anti-skid fog seal material.
Detailed Description
The invention provides an anti-slide fog seal material, which comprises epoxy resin, a curing agent, emulsified asphalt, fine aggregate and a polymer modifier;
the mass ratio of the epoxy resin to the curing agent to the emulsified asphalt is 3:1: 2;
the mass of the fine aggregate is 30-50% of the total mass of the epoxy resin, the curing agent and the emulsified asphalt;
the mass of the polymer modifier is 0.4-0.6% of the mass of the emulsified asphalt.
In the present invention, each raw material component is a commercially available product well known to those skilled in the art, unless otherwise specified.
The anti-skid fog seal material provided by the invention comprises epoxy resin, a curing agent, emulsified asphalt, fine aggregate and a polymer modifier.
In the invention, the mass ratio of the epoxy resin, the curing agent and the emulsified asphalt is 3:1: 2.
In the present invention, the epoxy resin preferably includes epoxy resin H1150 and epoxy resin H103; the relative dosage of the epoxy resin H1150 and the epoxy resin H103 is not specially required. In the present invention, the technical requirements of the epoxy resin H1150 are preferably: the solid content is more than or equal to 50 percent, the fineness is less than or equal to 40 mu m, the viscosity at the temperature of 20 ℃ is 150-250 Pa.s, and the epoxy value is 0.21-0.24 mol/100 g. In the present invention, the technical requirements of the epoxy resin H103 are preferably: the solid content is more than or equal to 20 percent, the fineness is less than or equal to 40 mu m, the viscosity at the temperature of 20 ℃ is 50-80 Pa.s, and the amine value is 0.06-0.08 mol/100 g. The epoxy resin H1150 and the epoxy resin H103 are adopted, and after the two epoxy resins are mixed with asphalt, construction is facilitated, and the bonding strength with a road is far higher than that of other epoxy resins. In the present invention, the curing agent is preferably an amine curing agent, and more preferably an epoxy curing agent T31.
In the invention, the Sibert viscosity of the emulsified asphalt is preferably 20-100 s, and more preferably 40-60 s; the evaporation residue of the emulsified asphalt is preferably more than or equal to 60 wt.%, and more preferably 65-80 wt.%; the density of the emulsified asphalt is preferably 0.91-1 g/cm3。
In the invention, the penetration degree of the emulsified asphalt is preferably 30-90 degrees, and more preferably 40-60 degrees; the penetration is the depth of a test standard needle penetrating vertically into an emulsified asphalt sample at 25 ℃ for 5s under a load of 0g in units of 1/10 mm.
In the present invention, the emulsified asphalt is an aqueous asphalt; the preparation method of the emulsified asphalt preferably comprises the following steps: mixing the matrix asphalt, the emulsifier and water at 140 ℃ to obtain the emulsified asphalt. In the present invention, the mass ratio of the base asphalt, the emulsifier and the water is preferably 60: (0.4-0.6): 40, more preferably 60: 0.5: 40. the source of the base asphalt of the present invention is not particularly limited, and asphalt for paving road surfaces known to those skilled in the art may be used. In the present invention, the emulsifier is preferably indulinAA 57. The emulsifier is adopted to modify the matrix asphalt at 140 ℃, and the emulsified asphalt produced by using the emulsifier has very good permeability and is far superior to other emulsified asphalt. In the present invention, the anti-mist seal material further comprises a polymer modifier and fine aggregate. In the invention, the mass of the polymer modifier is 0.4-0.6% of the mass of the emulsified asphalt. In the present invention, the polymer modifier preferably comprises indulinAA57, specifically a commercially available product from medley wecker. In the present invention, the mass of the fine aggregate is 30 to 50%, preferably 35 to 45%, and more preferably 40% of the total mass of the epoxy resin, the curing agent, and the emulsified asphalt. In the invention, the particle size of the fine aggregate is preferably 20-40 meshes, and more preferably 25-30 meshes; the fine aggregate is preferably corundum, and is further preferably brown corundum.
The preparation method of the anti-skid fog sealing layer material is not particularly limited, and the preparation method of the fog sealing layer material known by the person skilled in the art can be adopted. The epoxy resin, the curing agent, the emulsified asphalt, the fine aggregate and the polymer modifier are preferably mixed under the stirring condition to obtain the anti-slide fog seal material; the temperature of the environment in the mixing process is preferably 20-40 ℃; the mixing time is preferably 20-30 min, so that the viscosity is prevented from being reduced while the components are fully mixed. The invention preferably adopts the existing preparation mode, namely, the preparation of the anti-skid fog sealing material is finished immediately before the fog sealing treatment is carried out on the road surface.
The invention also provides a construction method of the anti-slide fog seal material in the technical scheme, which comprises the following steps:
(1) mixing the components of the anti-slide fog seal layer material to obtain mixed slurry;
(2) and (2) under the condition that the road surface temperature and the environmental temperature of the road surface to be treated are not lower than 20 ℃, spraying at least one layer of the mixed slurry obtained in the step (1) on the road surface to be treated, and then maintaining.
The components of the anti-slide fog seal layer material are mixed to obtain mixed slurry. In the present invention, the mixing manner of the components is the same as that described in the above-mentioned technical solution of the preparation method, and is not described herein again.
The invention cleans the road surface to be treated; the cleaning preferably comprises the steps of removing impurities by wind power, washing by clean water and drying in sequence. The invention has no special requirements for the implementation of the modes of removing impurities by wind power, washing by clean water and drying, and the method can be realized by adopting the method which is well known by the technical personnel in the field. The invention adopts the cleaning mode to realize the removal of the debris on the surface of the road surface to be treated; the debris specifically refers to soil, gravel, silt, weeds or oil stains.
After the mixed slurry is obtained and the pavement to be treated is cleaned, the mixed slurry is sprayed on at least one layer of the pavement to be treated for maintenance under the condition that the road surface temperature and the environmental temperature of the pavement to be treated are not lower than 20 ℃. In the spraying process, the road surface temperature and the environment temperature of the road surface to be treated are both more than or equal to 20 ℃, and the spraying can not be carried out in rainy days or foggy days; when the road surface temperature of the road surface to be treated is higher than 38 ℃, the road surface is preferably humidified by adopting water mist before slurry is sprayed; the invention has no special requirements on the specific implementation mode of the humidification, and the pavement humidification mode known by the technical personnel in the field can ensure that the humidity of the pavement is below 60 percent.
The mixed slurry is sprayed on at least one layer of the road surface to be treated and then maintained. In the present invention, the amount of the single-layer spraying of the mixed slurry is preferably 0.6 to 1.45kg/m based on the surface area of the road surface to be surface-treated2. In the invention, the single-layer spraying amount of the mixed slurry is preferably adjusted according to the roughness of the pavement to be treated, and specifically comprises the following steps: when the road surface to be treated is smooth, the friction coefficient is [0.4,0.5 ]]While, the single-layer spraying of the mixed slurryThe amount is [0.6kg/m ]2～0.8kg/m2]More preferably 0.65 to 0.7kg/m2(ii) a When the road surface to be treated has moderate smoothness and the friction coefficient is (0.5,0.6), the single-layer spraying amount of the mixed slurry is (0.8 kg/m)2～1.2kg/m2) More preferably 0.9 to 1.0kg/m2(ii) a The road surface after surface treatment is rough, when the friction coefficient is more than 0.60, the single-layer spraying amount of the mixed slurry is 1.2kg/m2～1.45kg/m2]More preferably 1.3 to 1.4kg/m2. According to the invention, different spraying amounts are carried out according to the roughness of the road surface to be treated, so that slipping caused by excessive spraying is avoided, and the sealing maintenance effect cannot be achieved due to less spraying.
In the present invention, the spraying manner is preferably mechanical spraying or manual spraying. The present invention does not require special embodiments for the mechanical and manual spraying, as will be familiar to those skilled in the art. When a mechanical spraying mode is adopted, the spraying method is preferably completed by a spraying machine which is produced by Nantong Keheng engineering Limited and has the model number of KH 0126; the width of one-time spraying in the mechanical spraying process is preferably less than or equal to 3.75 meters; the spraying amount of the mechanical spraying is preferably 100-200 kg per minute, and the speed of the mechanical spraying is preferably 3-5 km/h kilometer.
In the present invention, the number of spraying layers of the mixed slurry is at least one, preferably one, two or three. In the invention, when the road surface to be treated is a drainage road surface with larger structural depth or an SMA road surface with larger structural depth (the friction coefficient is more than 0.6), the number of sprayed layers of the mixed slurry is preferably three, which is beneficial to improving the service life of the anti-fog seal layer; when the road surface to be treated is an AC road surface or an SMA road surface with a general construction depth (the friction coefficient is 0.5-0.6), the number of sprayed layers of the mixed slurry is preferably two; when the road surface to be treated is a municipal road surface with a small construction depth (a friction coefficient of 0.5 or less), the number of sprayed layers of the mixed slurry is preferably one.
The effective functional period of the road with daily traffic of 5 thousands of times is 2-4 years, the anti-skid fog sealing layer material disclosed by the invention is adopted to complete the spraying on the road surface in a two-layer mode, and the anti-skid fog sealing layer material is sprayed once every 2-4 years in the effective life cycle of the road, so that the service life of the road can be prolonged by 200%.
When the number of sprayed layers of the mixed slurry is two or three, the sprayed pavement of the previous layer is preferably dried for 1 hour at normal temperature, and then the next layer is sprayed.
After the spraying is finished, the invention maintains the road surface. The concrete implementation mode of the maintenance is not particularly required, and the pavement maintenance mode known by the technical personnel in the field can be adopted. In the invention, the pavement can be put into normal use after being maintained for at least 2 hours.
In order to further illustrate the present invention, the following detailed description of the anti-skid fog seal and the construction method thereof are provided with reference to the examples, which should not be construed as limiting the scope of the present invention
Example 1
Preparing 300g of epoxy resin, 100g of curing agent, 200 g of emulsified asphalt, 240 g of fine aggregate and 0.8g of polymer modifier; wherein, epoxy is epoxy H1150 and epoxy H103, and epoxy H1150's technical requirement satisfies: the solid content is more than or equal to 50 percent, the fineness is less than or equal to 40 mu m, the viscosity at the temperature of 20 ℃ is 150-250 Pa.s, and the epoxy value is 0.21-0.24 mol/100 g; the technical requirements of the epoxy resin H103 meet: the solid content is more than or equal to 20 percent, the fineness is less than or equal to 40 mu m, the viscosity at the temperature of 20 ℃ is 50-80 Pa.s, and the amine value is 0.06-0.08 mol/100 g. The emulsified asphalt is obtained by mixing matrix asphalt, an emulsifier and water at 140 ℃; the emulsified asphalt has a Sabert viscosity of 100s, an evaporation residue of not less than 60 wt.%, and a density of 0.91g/cm3The penetration was 30 degrees at 25 ℃ and 5s under a load of 0 g.
Mixing the components for 20min under stirring to obtain mixed slurry for later use.
The road surface to be treated is a shen-Feng-jin highway with moderate surface roughness and a friction coefficient of about 0.55; cleaning the surface of the asphalt surface layer to be treated, removing debris (soil, gravel, silt, and the like) of all foreign matters, blowing the debris clean by a forest fire extinguisher, washing by clear water, and evaporating and drying the water.
Controlling the single-layer spraying amount to be 0.8kg/m under the condition that the road surface temperature and the environmental temperature of the road surface to be treated are more than or equal to 20 DEG C2Spraying a layer of mixed slurry on the road surface to be treated, drying at normal temperature for 1h, spraying for the second time, curing for 2h, forming a fog sealing layer on the road surface, and putting into use.
After spraying, the bonding performance of the fully cured mixture and the original pavement can be tested to be 3.6 MPa.
Comparative example 1
The pavement targeted by example 1 was also sprayed with a conventional fog seal material in the same manner. After spraying, the bonding performance of the fully cured mixture and the original pavement is only 0.3MPa after testing.
The friction coefficients of the original pavement before the fog seal is sprayed, the fog seal obtained after the fog seal material in the embodiment 1 is sprayed and the fog seal obtained after the conventional fog seal material in the proportion 1 is sprayed after 1 day are tested for multiple times, and the test results are shown in table 1.
TABLE 1 coefficient of friction for different road surface types
As can be seen from Table 1, the friction coefficient of the fog seal obtained by spraying the anti-skid fog seal material provided by the invention on the road surface is obviously improved, and the anti-skid capability of the road surface is improved.
Embodiment 2:
an anti-fog seal material was formulated as in example 1, except that 300g of fine aggregate and 1.2g of polymer modifier. The method is used for processing the Shanghai city linkage, and the service life is 2016 years and 10 months; spraying was carried out in the same manner as in example 1, with a spreading amount of 0.8kg/m2And one layer is sprayed.
After spraying, the bonding performance of the fully cured mixture and the original pavement can be tested to be 3.4 MPa.
The friction coefficients of the original road surface before the fog seal layer is sprayed, the fog seal layer obtained after the fog seal layer material in the embodiment 1 is sprayed for 1 month and one year are tested for multiple times, and the test results are shown in table 2.
TABLE 2 coefficient of friction for different pavement types
As can be seen from Table 2, the friction coefficient of the fog seal obtained by spraying the anti-skid fog seal material provided by the invention on the road surface is obviously improved, and the anti-skid capability of the road surface is improved; and the skid resistance is stable and durable.
The embodiment shows that the anti-skid fog sealing layer material provided by the invention can permeate into gaps of pavement aggregate and even flow into pavement pores to realize 'blood transfusion' of the pavement, so that the adhesion of pavement asphalt is recovered, tiny cracks and gaps of the pavement are filled, and the pavement is prevented from underwater seepage; meanwhile, the fine aggregate provides the anti-skid capability of the pavement, and the friction coefficient of the pavement treated by the anti-skid fog seal layer is improved. The results of the examples show that the friction coefficient of the road surface reaches above 60BPN after the road surface is subjected to surface treatment by using the anti-skid fog seal material.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. An anti-skid fog seal material comprises epoxy resin, a curing agent, emulsified asphalt, fine aggregate and a polymer modifier;
the mass ratio of the epoxy resin to the curing agent to the emulsified asphalt is 3:1: 2;
the mass of the fine aggregate is 30-50% of the total mass of the epoxy resin, the curing agent and the emulsified asphalt;
the mass of the polymer modifier is 0.4-0.6% of that of the emulsified asphalt;
the preparation method of the emulsified asphalt comprises the following steps: mixing and emulsifying matrix asphalt, an emulsifier and water at 140 ℃ to obtain emulsified asphalt; the mass ratio of the matrix asphalt to the emulsifier to the water is 60: (0.4-0.6): 40;
the curing agent is an epoxy curing agent T31;
the polymer modifier is indulinAA 57;
the epoxy resin comprises epoxy resin H1150 and epoxy resin H103;
the emulsifier is indulinAA 57.
2. The anti-mist seal coat material according to claim 1, wherein the emulsified asphalt has a Sabert viscosity of 20 to 100 s; the evaporation residue of the emulsified asphalt is more than or equal to 60 wt.%.
3. The anti-mist seal coat material according to claim 1, wherein the fine aggregate is 20-40 mesh silicon carbide.
4. A method of constructing the anti-mist seal coat material of any of claims 1 to 3, comprising the steps of: (1) mixing the components contained in the anti-slide fog seal layer material to obtain mixed slurry; cleaning a pavement to be treated;
(2) and (2) spraying at least one layer of the mixed slurry obtained in the step (1) on the road surface to be treated under the condition that the road surface temperature and the environmental temperature of the road surface to be treated are both more than or equal to 20 ℃, and then maintaining.
5. The construction method according to claim 4, wherein the amount of the single-layer spraying of the mixed slurry in the step (2) is 0.6 to 1.45kg/m based on the surface area of the road surface to be surface-treated2。
6. The construction method according to claim 4 or 5, wherein the amount of the single-layer spraying of the mixed slurry in the step (2) is adjusted according to the roughness of the road surface to be treated when the road surface to be treated is rubbedCoefficient of friction is 0.4,0.5]When the amount of the mixed slurry sprayed in a single layer is [0.6kg/m ]2,0.8kg/m2]；
When the friction coefficient of the road surface to be treated is (0.5,0.6), the single-layer spraying amount of the mixed slurry is (0.8 kg/m)2,1.2kg/m2)；
When the friction coefficient of the road surface after surface treatment is more than 0.60, the single-layer spraying amount of the mixed slurry is 1.2kg/m2,1.45kg/m2]。
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| CN110527310B (en) * | 2019-08-19 | 2021-09-03 | 江苏增光新材料科技股份有限公司 | Waterproof and anti-skid asphalt pavement maintenance material |
| CN110526624B (en) * | 2019-08-30 | 2022-10-18 | 中路高科(北京)公路技术有限公司 | Anti-blocking material for drainage asphalt pavement and preparation and use methods thereof |
| CN112411302B (en) * | 2020-11-18 | 2022-07-15 | 西安公路研究院 | Impermeable composite material and preparation method thereof, impermeable pavement and construction method thereof |
| CN115572106A (en) * | 2022-11-08 | 2023-01-06 | 贵州理工学院 | Low-carbon penetration-fixation type bituminous pavement sealing material |
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