CN113338108A - Anti-freezing wearing layer and maintenance construction method of asphalt pavement - Google Patents

Abstract

The invention discloses an anti-freezing wearing layer and a maintenance construction method of an asphalt pavement, wherein the anti-freezing wearing layer comprises special aggregate for the anti-freezing wearing layer and special emulsified asphalt for the anti-freezing wearing layer, and the special aggregate for the anti-freezing wearing layer comprises basalt, a temperature-sensitive anti-freezing agent, a filler, Portland cement and water; the special emulsified asphalt for the anti-freezing wearing layer comprises petroleum matrix asphalt, an emulsifier, a modifier, an emulsified asphalt charge regulator, an emulsified asphalt viscosity regulator and water. The temperature-sensitive anti-freezing agent is added into the aggregate special for the anti-freezing wearing layer, so that the active ingredients can be normally released in a low-temperature environment in winter, the release rate of the active ingredients is greatly reduced in spring, summer and autumn high-temperature seasons, the effect of the anti-freezing agent is ensured to the maximum extent, the service life is prolonged, the thickness of the anti-freezing wearing layer is thin, the paving cost is relatively low, and the rigid requirement of anti-freezing of the pavement in a service period can be met.

Description

Anti-freezing wearing layer and maintenance construction method of asphalt pavement

Technical Field

The invention relates to the technical field of asphalt pavement maintenance, in particular to an anti-freezing wearing layer and a maintenance construction method of an asphalt pavement.

Background

In winter, snowfall in northern areas and freezing rain in southern areas of China and other extreme weather easily cause accumulated snow on the road surface to be frozen, so that the skid resistance of the road surface is influenced, and the smoothness of the road and the driving safety are hindered. Particularly, the road ice condensation greatly reduces the friction coefficient between the vehicle tire and the road surface, thereby reducing the anti-skid capability of the vehicle tire, not only reducing the safe traffic capacity of the road and being easy to cause malignant traffic accidents, but also damaging the road and the accessory structure thereof, even causing traffic interruption in serious cases, and even causing abnormal proceeding of life and production of people, and even endangering the life and property safety of people. Therefore, research and development of scientific and effective road surface ice and snow inhibition technology are the focus of attention of road workers in various countries.

At present, pavement deicing is mainly divided into two major types, namely a passive pavement ice condensation inhibiting technology and an active pavement ice condensation inhibiting technology. The traditional passive road ice-freezing treatment modes such as manual mechanical cleaning and spreading of ice and snow melting agents have considerable hysteresis in timeliness. The method for removing the pavement and the bridge floor by the artificial machinery is easy to cause damage to the pavement and the bridge floor, has low efficiency, wastes manpower and material resources, and has high later-stage repair cost and frequent traffic accidents; the method for spreading the ice and snow melting agent is simple and practical, is a popular method for inhibiting the ice from being frozen on the road surface at home and abroad at present, but has high cost, is easy to corrode and damage the accessory facilities of roads and bridges, and pollutes the surrounding environment such as roads, structures, soil and the like.

In order to solve the problem, domestic and foreign scholars have studied the technology for actively inhibiting the road surface ice-condensation for many years, and have developed a physical anti-ice-condensation road surface, an energy conversion anti-ice-condensation road surface and an accumulated salt anti-ice-condensation road surface. Among them, the salt-storage type anti-icing road surface is the main market of the technology by virtue of its excellent performance. The salt-storage road surface is a special road surface which is obtained by adding a material with an anti-icing agent into an asphalt mixture in an externally or internally doped mode, and gradually releasing salt to the surface layer of the road surface by utilizing the action of the salt-storage road surface on vehicle tires and the capillary action of salt in a road surface structure layer, so that ice and snow on the road surface are inhibited.

However, the existing salt-storage active anti-freezing road surface technology has very large application limitation:

firstly, most of the salt storage anti-freezing agents in the market uniformly release effective components in winter in ice and snow weather or spring, summer and autumn with frequent rainwater, which causes great waste, and often causes the service life of the anti-freezing road surface to be far lower than the design life.

Thirdly, the existing salt-storage anti-icing agent is applied to the production of hot-mixed asphalt mixture, and the form of the salt-storage anti-icing agent is usually to additionally lay hot-mixed asphalt mixture with the thickness of 4 cm. This determines that such anti-icing road surface can only be used for newly-built roads or major and medium repair projects of roads. For a large number of road surfaces in the service period, the road conditions are relatively good, and how to meet the rigidity requirement of ice condensation resistance in winter by using a preventive maintenance means with low cost and quick and simple construction becomes a problem to be solved urgently.

Disclosure of Invention

The invention aims to provide an anti-freezing wearing layer and a maintenance construction method of an asphalt pavement, aiming at the defects of the prior art, the anti-freezing wearing layer has temperature sensitivity, can normally release effective components in a low-temperature environment in winter, greatly reduces the release rate of the effective components in high-temperature seasons in spring, summer and autumn, ensures the function of an anti-freezing agent to the maximum extent, prolongs the service life, has thin thickness and relatively low additional paving cost, and can meet the rigid requirement of anti-freezing of the pavement in a service period.

The technical scheme for realizing the aim of the invention is as follows:

an anti-freezing wearing layer is prepared by mixing the following raw materials in percentage by weight:

85-92% of aggregate special for the anti-freezing wearing layer;

8-15% of special emulsified asphalt for the anti-freezing wearing layer;

the aggregate special for the anti-freezing wearing layer is prepared by mixing the following raw materials in percentage by weight: 85-95% of basalt, 1-5% of a temperature-sensitive anti-icing agent, 0-1% of a filler, 0-3% of Portland cement and the balance of water, wherein the total amount of the raw materials is supplemented to 100%; (ii) a

The special emulsified asphalt for the anti-freezing wearing layer is special high-viscosity emulsified asphalt modified by high molecular polymers, and is prepared by mixing the following raw materials in percentage by weight: 55-65% of petroleum matrix asphalt, 1-3% of emulsifier, 0-5% of modifier, and an emulsified asphalt charge regulator: 0-1.0%, emulsified asphalt viscosity modifier: 0-0.3 percent of the total amount of the raw materials, and the balance of water, wherein the total amount of the raw materials is supplemented to 100 percent.

Furthermore, the temperature-sensitive anti-freezing agent is an internally doped anti-freezing agent, and is prepared by coating a common salt-storage anti-freezing agent with a temperature-sensitive nano material.

Further, the emulsified asphalt charge regulator is one or a combination of sodium chloride, calcium chloride and aluminum chloride.

Further, the emulsified asphalt viscosity regulator is one or a combination of more of gelatin, Arabic gum and guar gum.

Further, the petroleum-based asphalt of the emulsified asphalt special for the anti-icing wearing layer is No. 70 petroleum-based asphalt or No. 90 petroleum-based asphalt.

Furthermore, limestone mineral powder is selected as the filler of the aggregate special for the anti-freezing wearing layer.

Furthermore, the aggregate special for the anti-freezing wearing layer fully mixes the temperature-sensitive anti-freezing agent and the portland cement in advance.

Furthermore, the emulsifier of the emulsified asphalt special for the anti-icing wear layer is 18331 type emulsifier.

Further, the modifier of the special emulsified asphalt for the anti-icing wear layer is an SBR (styrene butadiene rubber) type modifier.

A maintenance construction method of an anti-freezing wearing layer asphalt pavement comprises the following steps:

s1: judging the state of the road surface and cleaning the road surface, and when the asphalt of the road surface layer is not aged, the surface of the road surface is not provided with fine cracks or the road section maintenance engineering does not have the requirement of spraying the curing agent, directly performing the step S5; when the road surface state is aged, the road surface is slightly cracked or the road surface maintenance engineering needs to spray the penetrating agent, the next step is carried out;

s2: surveying the spreading amount of the curing agent; sampling and analyzing an original road surface, detecting the penetration degree and the ductility of the original road surface asphalt, carrying out a simulated coating test on a construction road section on site, and determining the spreading amount of the consolidation agent by combining a detection result and a site simulated coating test result;

s3: pre-treating a road surface; repairing the defects of the road surface and reinforcing the original road surface;

s4: spraying a curing agent; filling the curing agent into a spreading vehicle, spreading according to the spreading amount predetermined in the step S1, and entering the next construction procedure after the curing agent is fully infiltrated and reacted;

s5: paving an anti-freezing wearing layer; the anti-freezing wearing layer is the anti-freezing wearing layer, and the thickness of the anti-freezing wearing layer is 0.8-1.2 cm;

s6: manually finishing;

s7: maintaining at an initial stage;

s8: opening traffic;

further, the curing agent in the step S2 is prepared by mixing the following raw materials in parts by weight:

20-40 parts of heavy naphthenic distillate oil, and selecting hydrodesulfurized heavy naphthenic petroleum light fraction;

15-30 parts of petroleum base asphalt, wherein No. 70 petroleum base asphalt or No. 90 petroleum base asphalt is selected;

1-3 parts of emulsifier, wherein 18331 type emulsifier is selected;

0-5 parts of a modifier, wherein an SBR type is selected;

40-65 parts of water.

Further, in the step S2, the detection results of the penetration and ductility of the asphalt are compared with the new asphalt index to calculate the attenuation ratio, and when one of the penetration and ductility attenuation ratios is greater than 20%, the spreading amount of the curing agent per square meter is not less than 0.3 Kg; when one of the attenuation proportion of the penetration degree or the ductility is more than 50 percent, the spreading amount of the curing agent per square meter is not less than 0.5 Kg.

Further, in the step S4, the spreading vehicle is an intelligent spreading vehicle or a gravel synchronous spreading vehicle, and the spreading amount is 0.3 to 0.7kg per square meter; and (3) waiting for 20-30 minutes under the condition of sunny days and sunny days, and if the sunny days are cloudy days, prolonging the time and waiting for 40-60 minutes until the penetration curing agent is fully infiltrated and reacted.

Further, the paving of the anti-icing wearing layer in the step S5 adopts an automatic slurry seal paver, and specifically includes the following steps:

s51: lofting and scribing; drawing a trend control line according to the lane width and the number of the vehicle journey times;

s52: charging; respectively loading the aggregate special for the anti-freezing wearing layer, the emulsified asphalt special for the anti-freezing and water into corresponding material boxes of the paver;

s53: spreading; paving the materials loaded in the step S52 according to a trend control line, feeding the materials again when any material box is used up, and continuously paving the materials from the position of retreating by 3-4 m, scraping the convex and over-dilute mixture, avoiding falling caused by inaccurate oil-water ratio when the machine is started, and enabling the stubbles to be smooth and orderly;

s54: performing seam treatment; and respectively carrying out transverse and longitudinal seam treatment on the paved road surface.

By adopting the technical scheme, the invention has the following beneficial effects:

(1) the special aggregate for the anti-freezing wearing layer is added with the temperature-sensitive anti-freezing agent, so that the wearing layer has the anti-freezing effect and temperature sensitivity, the anti-freezing agent component can be normally released in low-temperature environments in winter, the release rate of the anti-freezing agent component is greatly reduced in high-temperature seasons in spring, summer and autumn, the effect of the anti-freezing agent is ensured to the maximum extent, and the service life is prolonged; meanwhile, the anti-freezing agent can cause the overall stability of the wearing layer, and the emulsified asphalt charge regulator and the emulsified asphalt viscosity regulator are added into the emulsified asphalt special for the anti-freezing wearing layer, so that the influence is eliminated, and the overall stability of the wearing layer is ensured.

(2) The temperature-sensitive anti-freezing agent is prepared by coating a common salt-storage anti-freezing agent with a temperature-sensitive nano material, so that the anti-freezing ice has different release rates along with the temperature change, the service life is prolonged, and the cost is relatively low.

(3) The emulsified asphalt charge regulator and the emulsified asphalt viscosity regulator are provided with various different formulas, and are convenient to obtain, so that the cost is reduced.

(4) The petroleum-based asphalt of the emulsified asphalt provided by the invention is selected from No. 70 petroleum-based asphalt or No. 90 petroleum-based asphalt, and has good cohesiveness and excellent corrosion resistance.

(5) The filler of the aggregate special for the anti-freezing wearing layer is limestone mineral powder, so that the gaps of the asphalt concrete are reduced, and the strength and the stability of the asphalt concrete are improved.

(6) The aggregate special for the anti-freezing wearing layer fully mixes the temperature-sensitive anti-freezing agent and the portland cement in advance, and ensures the uniformity of mixing.

(7) The anti-icing wearing layer adopted by the maintenance construction method can furthest ensure the effect of the anti-icing agent, prolong the service life, simultaneously has thin thickness, is quick, simple and efficient, has relatively low additional paving cost, and can meet the rigid requirement of anti-icing of the pavement in the service period. When the road surface state is better, can directly additionally spread anti-icing wearing layer, when the road surface state is not good, spray the consolidation agent in advance to increase the interlayer bonding between the wearing layer of original road surface and newly additionally spread, satisfy different road conditions demand, further reduce additionally and spread the cost.

(8) The curing agent in the formula adopted by the maintenance construction method is demulsified after being sprayed on the original pavement, the heavy naphthenic distilled oil is quickly infiltrated to restore the performance of the old asphalt, the early diseases of the original asphalt pavement are repaired, and the compactness and the flexibility of the original asphalt pavement are improved; meanwhile, the mixture of the petroleum-based asphalt and the modifier is retained on the road surface to form a bonding layer, so that the interlayer bonding between the original road surface and a newly paved wearing layer is increased, the paved anti-freezing wearing layer is not easy to peel off and wear, and the durability is enhanced.

(9) The maintenance construction method paves the anti-icing wearing layer, and after materials are used up, the anti-icing wearing layer is paved continuously from a position retreating by 3-4 m, and the front sealing layer and the rear sealing layer are overlapped by one section, so that the wearing layer is prevented from falling off due to inaccurate oil-water ratio at the beginning of starting.

Drawings

In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a flow chart of the maintenance construction method of the present invention.

Detailed Description

In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.

(example 1)

The road surface of the embodiment has poor surveying state, the asphalt of the road surface layer is aged, the asphalt softening point is improved by 8 ℃ compared with that of newly paved asphalt, and the penetration degree is 65 percent of that of the newly paved asphalt, so the penetrating agent needs to be sprayed in advance before the anti-freezing wearing layer is paved.

The anti-freezing wearing layer of the embodiment is prepared by mixing the following raw materials in percentage by weight: 85% of aggregate special for the anti-freezing wearing layer; 15% of special emulsified asphalt for the anti-freezing wearing layer.

The aggregate special for the anti-freezing wearing layer is prepared by mixing the following raw materials in percentage by weight: 85% of basalt; 5% of temperature-sensitive anti-freezing agent, the type is internally doped anti-freezing agent, and the temperature-sensitive nano material is adopted to coat the common salt-storage anti-freezing agent, so that the anti-freezing agent has different release rates along with the temperature change, the service life is further prolonged, and the cost is relatively low; 1% of filler, and limestone mineral powder is selected; 3% of Portland cement; 6 percent of water. Fully mixing the temperature-sensitive anti-freezing agent and the portland cement in advance to ensure the mixing uniformity, and fully mixing the temperature-sensitive anti-freezing agent and other components by using a special paving vehicle to prepare the special aggregate for the anti-freezing ice wearing layer.

The special emulsified asphalt for the anti-freezing wearing layer is special high-viscosity emulsified asphalt modified by high molecular polymers, and is prepared by mixing the following raw materials in percentage by weight: 55% of petroleum base asphalt and 70 # petroleum base asphalt; 1% of emulsifier, and 18331 type emulsifier is adopted; 5% of a modifier, and selecting an SBR styrene butadiene rubber type modifier; emulsified asphalt charge regulator: 1% is sodium chloride; emulsified asphalt viscosity regulator: 0.3% of gelatin; 35.7 percent of water.

The curing agent of the embodiment is prepared by mixing the following raw materials in parts by weight: 20 parts of heavy naphthenic distillate oil, namely hydrodesulfurization heavy naphthenic petroleum light fraction; 30 parts of petroleum base asphalt, namely No. 70 petroleum base asphalt; 1 part of emulsifier, wherein 18331 type emulsifier is selected; and 65 parts of water.

The maintenance construction method of the anti-freezing wearing course asphalt pavement shown in fig. 1 comprises the following steps:

s1: cleaning the road surface; the method has the advantages that soil, sundries and the like on the original road surface are cleaned, the road surface is cleaned in an auxiliary mode through the sprinkler and the high-power blower, and no accumulated water is left on the original road surface.

S2: surveying the spreading amount of the curing agent; the method comprises the following steps of sampling and analyzing the original road surface, detecting the penetration degree and the ductility of the original road surface asphalt, carrying out a simulated coating test on the site of a construction road section, and determining the spreading amount of the consolidation agent by combining the detection result and the site simulated coating test result, wherein the method comprises the following specific steps:

s21: the method comprises the following steps of 1, surveying an original pavement, selecting a most representative road section for coring and sampling, uniformly cutting the core sample to 2cm of the surface, heating the core sample indoors, and extracting and recovering the core sample by using trichloroethylene;

s22: detecting penetration degree and ductility of the recycled asphalt, comparing the detection result with a new asphalt index (namely the lower limit of the required range of the same index in the existing asphalt pavement construction technical specification) to calculate an attenuation ratio, and taking the attenuation ratio as a preliminary basis for determining the spreading amount of the solid penetration component, wherein the attenuation ratio is large, which indicates that the aging is serious and the required spreading amount is large;

s23: when one of the attenuation proportion of the penetration degree or the ductility is more than 20 percent, the spreading amount of the curing agent per square meter is not less than 0.3 Kg; when one of the attenuation proportion of the penetration degree or the ductility is more than 50 percent, the spreading amount of the curing agent per square meter is not less than 0.5 Kg;

s24: and combining the indoor aging test result, carrying out a simulated coating test on the construction section site to determine the absorption rate for 30 minutes, and taking the absorption rate as a direct basis for the spreading amount of the site construction.

S3: pre-treating a road surface; when the local structure strength of the original pavement is insufficient, a proper method is selected for reinforcement according to specific conditions. The original road surface can be directly maintained under 10mm, and the rut parts above 10mm are filled in advance according to specific conditions. Meanwhile, in order to avoid hidden danger, the defects of crack pouring, road surface pit slot repairing, depression repairing and the like are repaired in advance.

S4: spraying a curing agent; and (4) loading the consolidation agent into a spreading vehicle, wherein the spreading vehicle is an intelligent spreading vehicle or a gravel synchronous spreading vehicle, spreading is carried out according to the spreading amount predetermined in the step S1, the spreading amount ranges from 0.3 to 0.7 kg/square meter, 20 to 30 minutes are waited under the condition of sunny days with sufficient sunlight, if the sunny days are cloudy days, the time is prolonged, 40 to 60 minutes are waited, and the next construction procedure is carried out after the consolidation agent is fully subjected to infiltration reaction.

S5: paving an anti-freezing wearing layer; the anti-freezing wearing layer adopts the anti-freezing wearing layer as above, the thickness is 0.8-1.2 cm, an automatic slurry seal paver is adopted, and the concrete steps are as follows:

s51: lofting and scribing; and adjusting the width of the paving box according to the width of the lane to enable the number of construction vehicle trips to be an integer. The width is set out from the curb, and the first car is marked with a running control line from the left side.

S52: charging; and respectively loading the special emulsified asphalt for anti-freezing meeting the requirements, the special aggregate for the anti-freezing wearing layer and water into corresponding material boxes of the paver.

S53: spreading; the method comprises the following specific steps:

s531: the spreader loaded with the materials is driven to a construction starting point, the trend control line is aligned, the spreader is placed at a working position, the thickness and the camber of the spreading box are adjusted, the rear rubber plate of the spreader is outwards turned, the other three rubber plates are inwards turned, the height and camber adjusting screws of the slideway are adjusted to enable the height and camber of the slideway to meet the spreading thickness required by construction, the periphery of the spreading box is kept to be tightly attached to the original pavement, and a mop cloth is hung;

s532, starting a machine after confirming the height or the opening degree of each material door, engaging a clutch of a mixing cylinder, enabling a stirring shaft to normally operate, and starting a spiral distributor of the paving box;

s533, opening control switches of all material doors to enable the emulsified asphalt special for the anti-freezing, the aggregate special for the anti-freezing wearing layer and water to enter a mixing cylinder according to a certain proportion, and spraying the emulsion when the pre-wetted mixture is pushed to an emulsion spraying port; wherein, during stirring, the water quantity is further finely adjusted by controlling a switch, so that the slurry has moderate consistency and is suitable for being paved but not flowing (when the ground humidity is higher, less water is needed to be added, even no water is added);

s534, adjusting the flow direction of the mixture on the diverter to ensure that the mixture can uniformly flow to the left and the right of the spreading box;

and S535, when the mixture is uniformly distributed in the full-width range of the paving box, starting the chassis and slowly moving forwards, wherein the paving amount of the normal-temperature asphalt mixture is basically consistent with the production amount, and the volume of the mixture in the paving box is about 1/2 of the volume of the paving box. Attention is paid to prevent mixture from overflowing during construction;

s536, when any material on the paver is used up, all switches are immediately closed, so that the mixture in the stirring cylinder is uniformly stirred and is conveyed into the paving box to be paved, and then the forward movement is stopped;

s537, when the materials are added and paved again, the front vehicle is retreated from the paving end point by 3-4 m, so that a section of the two sealing layers is overlapped. The raised and over-diluted mixture is scraped, so that the falling caused by inaccurate oil-water ratio during starting is avoided, and the connected stubbles are smooth and regular;

and S538, lifting the spreading box when the construction is finished, then opening the spreading machine and the spreading box out of the road, and cleaning the stirring cylinder and the spreading box.

S54: performing seam treatment; and respectively carrying out transverse and longitudinal seam treatment on the paved road surface.

And (3) transverse seam treatment: usually, the transverse seam is in a butt joint mode, and the automatic slurry seal paver advances at a slightly slower speed when at a starting point, so that the phenomenon of arching caused by over-thick paving due to excessive mixture in a paving box can be avoided. After a car is paved, a spade is used for shoveling the joint, an iron sheet is paved at the joint and is flush with the tail end of the joint, the paving car is hung on the paving box and is poured to the joint, the paving box is placed on the iron sheet, and after the paver advances, the iron sheet and the mixture on the iron sheet are taken away together.

Longitudinal seam treatment: the construction lanes are constructed successively (from low to high) from the outer side to the central separation zone, during construction, pre-wetting water treatment is firstly carried out at the laid half-width joint, the edge of a laying box is infinitely close to the edge of the laid lane, and the dilute slurry mixture has a certain self-flowing effect, so that the connection of the mixtures of the two lanes is facilitated. If the lap joint is too thick or not well jointed, the lap joint is manually scraped before forming.

S6: manually finishing; after the wearing layer is paved, manual leveling is immediately carried out, including a starting point, a finishing point, a longitudinal joint, an over-thick part, an over-thin part or an uneven part, and particularly, scratches generated on mineral aggregates with ultra-large particle sizes are removed and filled as soon as possible.

S7: maintaining at an initial stage; after the mixture of the wearing layer is paved, all vehicles and pedestrians are prohibited from passing through before the traffic is opened. The mixture is generally not required to be rolled by a road roller after being paved. When the emulsion breaking and primary forming mixed material is used in occasions where driving rolling is absent or not available, such as hard road shoulders, parking lots and the like, or in order to meet certain special requirements, a 6-10t rubber-wheel road roller can be used for rolling the emulsion breaking and primary forming mixed material.

S8: opening traffic; after the anti-freezing wear layer is initially set, the anti-freezing wear layer needs a period of curing to be gradually hardened to a degree capable of supporting the rolling of the vehicle, so that the time for opening traffic is longer than the initial setting time, and the vehicle is prohibited from passing in the period so as to avoid leaving the wheel marks. The time for opening traffic will be determined based on the site temperature, wind speed, etc.

(example 2)

The road surface of the embodiment has poor surveying state, the road surface layer is poor in oil and white, the asphalt is seriously aged, the ductility of the original road surface asphalt at 10 ℃ is 0, the softening point is improved by 10 ℃ compared with the newly paved asphalt, and therefore the penetrating agent needs to be sprayed in advance before the anti-freezing wearing layer is paved.

The maintenance construction method of the anti-freezing wearing layer asphalt pavement of the embodiment is basically the same as that of the embodiment 1, and the difference is that the anti-freezing wearing layer and the curing agent are different in formula.

The anti-freezing wearing layer of the embodiment is prepared by mixing the following raw materials in percentage by weight: 88% of aggregate special for the anti-freezing wearing layer; 12 percent of special emulsified asphalt for the anti-freezing wearing layer.

The aggregate special for the anti-freezing wearing layer is prepared by mixing the following raw materials in percentage by weight: 90% of basalt; 3% of temperature-sensitive anti-freezing agent, the type is an internally doped anti-freezing agent, and the temperature-sensitive nano material is adopted to coat the common salt-storage anti-freezing agent to prepare the anti-freezing agent; 0.5% of filler, and limestone mineral powder is selected; 2% of Portland cement; 4.5 percent of water. Fully mixing the temperature-sensitive anti-freezing agent and the portland cement in advance to ensure the mixing uniformity, and fully mixing the temperature-sensitive anti-freezing agent and other components by using a special paving vehicle to prepare the special aggregate for the anti-freezing ice wearing layer.

The special emulsified asphalt for the anti-freezing wearing layer is special high-viscosity emulsified asphalt modified by high molecular polymers, and is prepared by mixing the following raw materials in percentage by weight: 60% of petroleum base asphalt, and 90 # petroleum base asphalt is selected, so that the adhesive property is good, and the corrosion resistance is excellent; 2% of emulsifier, and 18331 type emulsifier is adopted; 3% of a modifier, and an SBR styrene butadiene rubber type modifier is selected; emulsified asphalt charge regulator: 0.6 percent of sodium chloride and calcium chloride are adopted; emulsified asphalt viscosity regulator: 0.2% by weight of Arabic gum; and (5) 34.2% of water.

The curing agent of the embodiment is prepared by mixing the following raw materials in parts by weight: 30 parts of heavy naphthenic distillate oil, namely hydrodesulfurization heavy naphthenic petroleum light fraction; 24 parts of petroleum base asphalt, namely No. 90 petroleum base asphalt; 2 parts of emulsifier, wherein 18331 type emulsifier is selected; 3 parts of a modifier, namely SBR styrene butadiene rubber type is selected; 55 parts of water.

(example 3)

The pavement of the embodiment has poor surveying state, although the asphalt of the pavement surface layer is slightly aged, the pavement has capillary cracks, so the penetrating agent needs to be sprayed in advance before the anti-freezing wearing layer is paved.

The maintenance construction method of the anti-freezing wearing layer asphalt pavement of the embodiment is basically the same as that of the embodiment 1, and the difference is that the anti-freezing wearing layer and the curing agent are different in formula.

The anti-freezing wearing layer of the embodiment is prepared by mixing the following raw materials in percentage by weight: 92% of aggregate special for the anti-freezing wearing layer; 8 percent of special emulsified asphalt for the anti-freezing wearing layer.

The aggregate special for the anti-freezing wearing layer is prepared by mixing the following raw materials in percentage by weight: 95% of basalt; 1% of temperature-sensitive anti-freezing agent, namely an internal-doped anti-freezing agent, and is prepared by coating a common salt-storage anti-freezing agent with a temperature-sensitive nano material; 1% of Portland cement; and 3% of water. Fully mixing the temperature-sensitive anti-freezing agent and the portland cement in advance to ensure the mixing uniformity, and fully mixing the temperature-sensitive anti-freezing agent and other components by using a special paving vehicle to prepare the special aggregate for the anti-freezing ice wearing layer.

The special emulsified asphalt for the anti-freezing wearing layer is special high-viscosity emulsified asphalt modified by high molecular polymers, and is prepared by mixing the following raw materials in percentage by weight: 65% of petroleum base asphalt and 90 # petroleum base asphalt; 1% of emulsifier, and 18331 type emulsifier is adopted; 0.1% of a modifier, and an SBR styrene-butadiene rubber type modifier is selected; emulsified asphalt charge regulator: 0.2% by weight of aluminum chloride; emulsified asphalt viscosity regulator: 0.1% by weight of a mixture of gum arabic and guar gum; 33.6 percent of water.

The curing agent of the embodiment is prepared by mixing the following raw materials in parts by weight: 40 parts of heavy naphthenic distillate oil, namely hydrodesulfurization heavy naphthenic petroleum light fraction; 15 parts of petroleum base asphalt, namely No. 90 petroleum base asphalt; 3 parts of emulsifier, wherein 18331 type emulsifier is selected; 5 parts of a modifier, namely SBR styrene butadiene rubber type is selected; and 40 parts of water.

(example 4)

The pavement of the embodiment has a better surveying state, and the anti-freezing wearing layer can be directly paved, so that the paving cost is reduced.

The anti-freezing wearing layer of the embodiment is prepared by mixing the following raw materials in percentage by weight: aggregate 90% special for the anti-freezing wearing layer; 10% of special emulsified asphalt for the anti-freezing wearing layer.

The aggregate special for the anti-freezing wearing layer is prepared by mixing the following raw materials in percentage by weight: 91% of basalt; 2% of temperature-sensitive anti-freezing agent, namely an internal-doped anti-freezing agent, and is prepared by coating a common salt-storage anti-freezing agent with a temperature-sensitive nano material; 0.6% of filler, and limestone mineral powder is selected; 2% of Portland cement; 4.4 percent of water. Fully mixing the temperature-sensitive anti-freezing agent and the portland cement in advance to ensure the mixing uniformity, and fully mixing the temperature-sensitive anti-freezing agent and other components by using a special paving vehicle to prepare the special aggregate for the anti-freezing ice wearing layer.

The special emulsified asphalt for the anti-freezing wearing layer is special high-viscosity emulsified asphalt modified by high molecular polymers, and is prepared by mixing the following raw materials in percentage by weight: 62% of petroleum base asphalt and 90 # petroleum base asphalt are selected, so that the adhesive property is good, and the corrosion resistance is excellent; 1% of emulsifier, and 18331 type emulsifier is adopted; 3% of a modifier, and an SBR styrene butadiene rubber type modifier is selected; emulsified asphalt charge regulator: 0.6 percent of sodium chloride and calcium chloride are adopted; emulsified asphalt viscosity regulator: 0.2% by weight of Arabic gum; and (5) 34.2% of water.

The concrete construction method comprises the following steps:

s1: cleaning the road surface, the concrete operation is as in step S1 of example 1;

s2; paving an anti-ice wearing layer, and referring to step S5 of example 1 in specific operation;

s2: manual trimming, the specific operation refers to step S6 of example 1;

s3: initial maintenance, the detailed operation is performed in step S7 of example 1;

s4: for opening traffic, the detailed operation is performed in step S8 of example 1.

The special aggregate for the anti-freezing wearing layer is added with the temperature-sensitive anti-freezing agent, so that the wearing layer has the anti-freezing effect and temperature sensitivity, the anti-freezing agent component can be normally released in low-temperature environments in winter, the release rate of the anti-freezing agent component is greatly reduced in high-temperature seasons in spring, summer and autumn, the effect of the anti-freezing agent is ensured to the maximum extent, and the service life is prolonged; meanwhile, the anti-freezing agent can cause the overall stability of the wearing layer, and the emulsified asphalt charge regulator and the emulsified asphalt viscosity regulator are added into the emulsified asphalt special for the anti-freezing wearing layer, so that the influence is eliminated, and the overall stability of the wearing layer is ensured.

The curing agent in the formula adopted by the maintenance construction method is demulsified after being sprayed on the original pavement, the heavy naphthenic distilled oil is quickly infiltrated to restore the performance of the old asphalt, the early diseases of the original asphalt pavement are repaired, and the compactness and the flexibility of the original asphalt pavement are improved; meanwhile, the mixture of the petroleum matrix asphalt and the emulsifier is retained on the road surface to form a bonding layer, so that the interlayer bonding between the original road surface and a newly paved wearing layer is increased, the paved anti-freezing wearing layer is not easy to peel off and wear, and the durability is enhanced. For roads with good road surface states, the anti-icing wearing layer can be directly paved, and the paving cost is further reduced.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An anti-freezing wearing layer is characterized by being prepared by mixing the following raw materials in percentage by weight:

85-92% of aggregate special for the anti-freezing wearing layer;

8-15% of special emulsified asphalt for the anti-freezing wearing layer;

the aggregate special for the anti-freezing wearing layer is prepared by mixing the following raw materials in percentage by weight: 85-95% of basalt, 1-5% of a temperature-sensitive anti-icing agent, 0-1% of a filler, 0-3% of Portland cement and the balance of water, wherein the total amount of the raw materials is supplemented to 100%;

the special emulsified asphalt for the anti-freezing wearing layer is special high-viscosity emulsified asphalt modified by high molecular polymers, and is prepared by mixing the following raw materials in percentage by weight: 55-65% of petroleum matrix asphalt, 1-3% of emulsifier, 0-5% of modifier, and an emulsified asphalt charge regulator: 0-1.0%, emulsified asphalt viscosity modifier: 0-0.3 percent of the total amount of the raw materials, and the balance of water, wherein the total amount of the raw materials is supplemented to 100 percent.

2. An anti-ice-freezing wearing layer according to claim 1, wherein: the temperature-sensitive anti-freezing agent is prepared by coating a common salt-storage anti-freezing agent with a temperature-sensitive nano material.

3. An anti-ice-freezing wearing layer according to claim 1, wherein: the emulsified asphalt charge regulator is one or a combination of sodium chloride, calcium chloride and aluminum chloride.

4. An anti-ice-freezing wearing layer according to claim 1, wherein: the emulsified asphalt viscosity regulator is one or a combination of more of gelatin, Arabic gum and guar gum.

5. An anti-ice-freezing wearing layer according to claim 1, wherein: the petroleum-based asphalt of the emulsified asphalt special for the anti-freezing wearing layer is No. 70 petroleum-based asphalt or No. 90 petroleum-based asphalt.

6. An anti-ice-freezing wearing layer according to claim 1, wherein: the filler of the aggregate special for the anti-freezing wearing layer is limestone mineral powder.

7. An anti-ice-freezing wearing layer according to claim 1, wherein: the aggregate special for the anti-freezing ice wearing layer fully mixes the temperature-sensitive anti-freezing agent and the portland cement in advance.

8. A maintenance construction method of an anti-freezing wearing layer asphalt pavement is characterized by comprising the following steps:

s1: judging the road surface state and cleaning the road surface, and directly performing step S5 when the road surface state is good; otherwise, carrying out the next step;

s2: surveying the spreading amount of the curing agent; sampling and analyzing an original road surface, detecting the penetration degree and the ductility of the original road surface asphalt, carrying out a simulated coating test on a construction road section on site, and determining the spreading amount of the consolidation agent by combining a detection result and a site simulated coating test result;

s3: pre-treating a road surface; repairing the defects of the road surface and reinforcing the original road surface;

s4: spraying a curing agent; filling the curing agent into a spreading vehicle, spreading according to the spreading amount predetermined in the step S2, and entering the next construction procedure after the curing agent is fully infiltrated and reacted;

s5: paving an anti-freezing wearing layer; the anti-freezing abrasion layer is the anti-freezing abrasion layer as defined in any one of claims 1 to 7, and the thickness is 0.8-1.2 cm;

s6: manually finishing;

s7: maintaining at an initial stage;

s8: and opening the traffic.

9. The maintenance construction method of an anti-freezing wearing course bituminous pavement according to claim 8, characterized in that: the curing agent in the step S2 is prepared by mixing the following raw materials in parts by weight:

20-40 parts of heavy naphthenic distilled oil;

15-30 parts of petroleum matrix asphalt;

1-3 parts of an emulsifier;

0-5 parts of a modifier;

40-65 parts of water.

10. The maintenance construction method of an anti-freezing wearing course bituminous pavement according to claim 8, characterized in that: the paving of the anti-ice-freezing wearing layer in the step S5 adopts an automatic slurry seal paver, and specifically comprises the following steps:

s51: lofting and scribing; drawing a trend control line according to the lane width and the number of the vehicle journey times;

s52: charging; respectively loading the aggregate special for the anti-freezing wearing layer, the emulsified asphalt special for the anti-freezing and water into corresponding material boxes of the paver;

s53: spreading; paving the materials loaded in the step S52 according to a trend control line, feeding the materials again when any material box is used up, and continuously paving the materials from the position of retreating by 3-4 m, scraping the convex and over-dilute mixture, avoiding falling caused by inaccurate oil-water ratio when the machine is started, and enabling the stubbles to be smooth and orderly;

s54: performing seam treatment; and respectively carrying out transverse and longitudinal seam treatment on the paved road surface.

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