阅读说明：本技术 一种沥青混凝土路面施工方法 (Asphalt concrete pavement construction method ) 是由 梁贵传 黄浩 蒋若琳 卢成发 徐波 于 2021-08-16 设计创作，主要内容包括：本发明涉及路面施工领域,具体公开了一种沥青混凝土路面施工方法,包括以下步骤：步骤1),将沥青在密封容器中加热至95-105℃,持续负压抽出密封容器中气体,将抽出的气体通入冷却水中,获得分层液,加热后的沥青为预热沥青；步骤2),控制分层液温度为30-35℃,过滤分层液获得滤液和滤渣；步骤3),将滤液静置分层,取上层液；步骤4),将预热沥青、上层液投入搅拌釜中,加热至190-200℃,混合均匀,获得预处理沥青；步骤5),在预处理沥青中投入骨料、高分子改性剂,加热至230-240℃,混合均匀,获得沥青混凝土；步骤6),在路面基层上铺摊沥青混凝土,压平,养护,制得沥青混凝土路面。本发明具有提高沥青混凝土路面的适用范围的优点。(The invention relates to the field of pavement construction, and particularly discloses a method for constructing an asphalt concrete pavement, which comprises the following steps: step 1), heating asphalt in a sealed container to 95-105 ℃, continuously pumping gas out of the sealed container at negative pressure, and introducing the pumped gas into cooling water to obtain a layering liquid, wherein the heated asphalt is preheated asphalt; step 2), controlling the temperature of the layering liquid to be 30-35 ℃, and filtering the layering liquid to obtain filtrate and filter residue; step 3), standing and layering the filtrate, and taking supernatant; step 4), putting the preheated asphalt and the supernatant into a stirring kettle, heating to 190-; step 5), adding aggregate and a polymer modifier into the pretreated asphalt, heating to 230-240 ℃, and uniformly mixing to obtain asphalt concrete; and 6), paving asphalt concrete on the pavement base, flattening and maintaining to obtain the asphalt concrete pavement. The invention has the advantage of improving the application range of the asphalt concrete pavement.)

1. A construction method of an asphalt concrete pavement is characterized by comprising the following steps: the method comprises the following steps:

step 1), heating asphalt in a sealed container to 95-105 ℃, continuously pumping gas out of the sealed container at negative pressure, and introducing the pumped gas into cooling water to obtain a layering liquid, wherein the heated asphalt is preheated asphalt;

step 2), controlling the temperature of the layering liquid to be 30-35 ℃, and filtering the layering liquid to obtain filtrate and filter residue;

step 3), standing and layering the filtrate, and taking supernatant;

step 4), putting the preheated asphalt and the supernatant into a stirring kettle, heating to 190-;

step 5), adding aggregate and a polymer modifier into the pretreated asphalt, heating to 230-240 ℃, and uniformly mixing to obtain asphalt concrete;

and 6), paving asphalt concrete on the pavement base, flattening and maintaining to obtain the asphalt concrete pavement.

2. The asphalt concrete pavement construction method according to claim 1, characterized in that: in the step 1), a channel formed between the sealed container and the cooling water and used for introducing the gas pumped out from the sealed container into the cooling water is kept at a constant temperature of 95-105 ℃.

3. The asphalt concrete pavement construction method according to claim 1, characterized in that: in the step 1), cooling water is placed in a constant temperature container, and the temperature of the cooling water is kept at 30-35 ℃ in the process of introducing the gas pumped out from the sealed container into the cooling water.

4. The asphalt concrete pavement construction method according to claim 1, characterized in that: in the step 2), a 200-270-mesh screen is adopted for filtering.

5. An asphalt concrete pavement construction method according to any one of claims 1 to 4, characterized in that: the asphalt concrete comprises the following components in parts by weight:

100 parts of pretreated asphalt;

2630 portions and 2640 portions of aggregate;

19.5-20.5 parts of high molecular modifier.

6. An asphalt concrete pavement construction method according to claim 5, characterized in that: the aggregate is a compound of crushed stone, sand and mineral powder, and the mass ratio of the crushed stone, the sand to the mineral powder is 18.25: 5.75: 1.

7. an asphalt concrete pavement construction method according to claim 5, characterized in that: the polymer modifier is a compound of polyvinylpyrrolidone and polychlorotrifluoroethylene, wherein the mass ratio of the polyvinylpyrrolidone to the polychlorotrifluoroethylene is 1: 0.61-0.65.

8. An asphalt concrete pavement construction method according to claim 7, characterized in that: the mass ratio of the polyvinylpyrrolidone to the polychlorotrifluoroethylene is 1: 0.63.

Technical Field

The invention relates to the field of pavement construction, in particular to a method for constructing an asphalt concrete pavement.

Background

With the social development, the range of activities of people is getting larger and larger, which results in the rapid development of traffic, wherein the highway traffic is short-range traffic, and is developed, and the common highway pavement is concrete pavement and asphalt concrete pavement, wherein the asphalt concrete pavement has better driving experience due to the softness thereof, and is widely used.

Asphalt is an organic cementing material of asphalt concrete, is one of the most critical materials, is a mixture, has very complex components, can be roughly divided into three components, namely asphaltene, colloid and oil component according to the properties of the components, and plays corresponding roles, wherein the asphalt also contains partial wax which has great influence on the temperature sensitivity of the asphalt, the asphalt is easy to soften at high temperature and becomes brittle and easy to crack at low temperature, meanwhile, the wax can reduce the adhesion of the asphalt and aggregates and seriously affect the quality of the asphalt, so that the sensitivity of the asphalt concrete pavement to the temperature is higher, the applicable temperature range is narrower, the asphalt is difficult to apply in regions with large annual temperature difference, the application range of the asphalt concrete pavement is reduced, and the space is improved.

Disclosure of Invention

In order to improve the application range of the asphalt concrete pavement, the application provides a construction method of the asphalt concrete pavement.

The construction method for the asphalt concrete pavement provided by the application adopts the following technical scheme:

a construction method of an asphalt concrete pavement comprises the following steps:

step 1), heating asphalt in a sealed container to 95-105 ℃, continuously pumping gas out of the sealed container at negative pressure, and introducing the pumped gas into cooling water to obtain a layering liquid, wherein the heated asphalt is preheated asphalt;

step 2), controlling the temperature of the layering liquid to be 30-35 ℃, and filtering the layering liquid to obtain filtrate and filter residue;

step 3), standing and layering the filtrate, and taking supernatant;

step 4), putting the preheated asphalt and the supernatant into a stirring kettle, heating to 190-;

step 5), adding aggregate and a polymer modifier into the pretreated asphalt, heating to 230-240 ℃, and uniformly mixing to obtain asphalt concrete;

and 6), paving asphalt concrete on the pavement base, flattening and maintaining to obtain the asphalt concrete pavement.

By adopting the technical scheme, the asphalt is heated to 95-105 ℃, so that the wax in the asphalt is melted and evaporated, the asphalt is softened to a certain extent at the temperature but basically keeps the original state due to high melting temperature, then negative pressure suction is matched, so that the wax steam is pumped out of the sealed container, meanwhile, due to high temperature, part of oil in the asphalt can also form steam and be pumped out together with the wax steam, the pumped gas is introduced into cooling water, so that the wax steam is cooled and solidified, the oil is cooled and converted into liquid, and because the specific gravity of the oil and the wax is smaller than that of water, the oil and the wax can float on the water surface to generate layering, the wax is removed by filtering, the oil and the water are separated by standing layering, the oil is re-added into the preheated asphalt, so that the wax in the pretreated asphalt is reduced and the oil content is not changed greatly, therefore, the obtained pretreated asphalt has reduced temperature sensitivity, is not easy to soften at high temperature and is not easy to crisp and crack at low temperature, the prepared asphalt concrete has wider application temperature range, is better suitable for areas with larger annual temperature difference, and the application range of the asphalt concrete pavement prepared from the asphalt concrete is improved.

By adding the macromolecular modifier, the performance of the asphalt is further improved, so that the worthy pavement has stronger tensile anti-cracking performance, is difficult to crack particularly in a low-temperature state, and the prepared asphalt concrete pavement has stable and durable structure.

Preferably, in the step 1), a passage formed between the sealed container and the cooling water for introducing the gas pumped out from the sealed container into the cooling water is kept at a constant temperature of 95-105 ℃.

Through adopting above-mentioned technical scheme, through keeping the passageway constant temperature for thereby the steam of wax steam and oil content is difficult to be cooled off in the passageway and is depositd in the passageway, makes wax and oil content carry to the cooling water again and cools off more smoothly, reduces the influence to equipment, also makes the oil content collect more fully in order to join once more in preheating asphalt, makes the oil content loss reduce in the preliminary treatment asphalt, ensures the quality of preliminary treatment asphalt preferred.

Preferably, in the step 1), the cooling water is placed in a constant temperature container, and the temperature of the cooling water is kept at 30-35 ℃ during the process that the gas pumped out of the sealed container is introduced into the cooling water.

Through adopting above-mentioned technical scheme, through the temperature that keeps the cooling water for in the cooling process, avoid the cooling water to be heated and lead to the cooling effect careful, it is the too much condition of oil content loss to reduce oil content steam escape, avoid the water temperature too low simultaneously, lead to oil content mobility too poor and make the too much adhesion of oil content in filtration equipment and the too much condition of loss when filtering, and keep the oil content to have better mobility and also make solid-liquid separation's when filtering efficiency higher, improve the operating efficiency.

Preferably, in the step 2), a 200-270-mesh screen is adopted for filtration.

By adopting the technical scheme, the wax can be filtered by the 200-mesh 270-mesh screen, so that the wax filtering effect is better, the entanglement flow of the wax in oil is reduced, and the wax removing effect is better.

Preferably, the components for composing the asphalt concrete are as follows in parts by weight:

100 parts of pretreated asphalt;

2630 portions and 2640 portions of aggregate;

19.5-20.5 parts of high molecular modifier.

By adopting the technical scheme, the asphalt concrete has better structural stability through specific proportion matching, and the prepared asphalt concrete pavement is not easy to damage and durable.

Preferably, the aggregate is a compound of crushed stone, sand and mineral powder, and the mass ratio of the crushed stone, the sand to the mineral powder is 18.25: 5.75: 1

By adopting the technical scheme, the aggregate with special proportion ensures that the asphalt concrete has stronger anti-rutting performance, the pavement is not easy to deform, the asphalt concrete pavement is not easy to damage, and the quality is better.

Preferably, the high molecular modifier is a compound of polyvinylpyrrolidone and polychlorotrifluoroethylene, and the mass ratio of the polyvinylpyrrolidone to the polychlorotrifluoroethylene is 1: 0.61-0.65.

Preferably, the mass ratio of the polyvinylpyrrolidone to the polychlorotrifluoroethylene is 1: 0.63.

by adopting the technical scheme, the polyvinylpyrrolidone and the polychlorotrifluoroethylene are added in a specific proportion, so that the asphalt concrete is not easy to crack, and has a stable structure and better quality.

The inventor guesses that the adhesion between the asphalt and the aggregate is stronger due to the addition of the polyvinylpyrrolidone and the polychlorotrifluoroethylene, various molecular chains in the asphalt are restrained through the polyvinylpyrrolidone and the polychlorotrifluoroethylene, the asphalt is reinforced, the asphalt is not easy to deform, the softening point is effectively further improved, and the polyvinylpyrrolidone and the polychlorotrifluoroethylene molecular chains share the stress at low temperature, so that the asphalt molecular chains are not easy to break, the cracking resistance of the asphalt concrete is stronger, the asphalt concrete is better suitable for the low-temperature environment, and the structural stability is better maintained in the low-temperature environment.

In summary, the present application has the following beneficial effects:

1. the wax in the asphalt is melted and evaporated by heating the asphalt to 95-105 ℃, the asphalt is softened to a certain degree at the temperature but basically keeps the original shape due to the higher melting temperature, then the wax steam is pumped out of the sealed container by matching with negative pressure pumping, meanwhile, due to the higher temperature, part of oil in the asphalt can be formed into steam and pumped out together with the wax steam, the pumped gas is introduced into cooling water, the temperature of the wax steam is reduced and solidified, the oil is cooled and converted into liquid, and because the specific gravity of the oil and the wax is smaller than that of water, the oil and the wax can float on the water surface to generate layering, the wax is removed by filtering, the oil and the wax are separated by standing layering, then the oil is re-added into the preheated asphalt, so that the wax in the pretreated asphalt is reduced and the oil content is not changed greatly, and the temperature sensitivity of the obtained pretreated asphalt is reduced, the asphalt concrete is not easy to soften at high temperature and is not easy to crisp and crack at low temperature, so that the prepared asphalt concrete has wider application temperature range, is better suitable for areas with larger annual temperature difference, and improves the application range of asphalt concrete pavements prepared from the asphalt concrete.

2. It is preferred through keeping the passageway constant temperature in this application for thereby the steam of wax steam and oil content is difficult for in the passageway cooling deposit in the passageway, makes wax and oil content carry to the cooling water again and cools off more smoothly, reduces the influence to equipment, also makes the oil content collect more fully in order to join once more in preheating the pitch, makes the oil content loss reduce in the preliminary treatment pitch, ensures the quality of preliminary treatment pitch preferred.

3. In the application, the polyvinylpyrrolidone and the polychlorotrifluoroethylene are preferably added in a specific proportion, so that the asphalt concrete is not easy to crack, and has a stable structure and better quality.

Detailed Description

The present application will be described in further detail with reference to examples.

In the following examples and comparative examples, the information on the source of each component is shown in Table 1.

TABLE 1

Raw materials	Source information
		Asphalt	"Heshuizhihao" rubber chemical Co., Ltd, 70 road asphalt, cat 76
Crushing stone	Average particle size of 16cm, Mass Stone industries, Ltd, in the hemp City
		Sand	Hebei Baozan engineering construction Co., Ltd, river sand, average particle size 6mm
Mineral powder	Lingshou Dingwang mineral product processing plant, grade S95 mineral powder
		Polyvinylpyrrolidone	Shandonghao Shunhua chemical company, model K30
Polychlorotrifluoroethylene	Japan Dajin, brand number M-300H

Example 1

A construction method of an asphalt concrete pavement comprises the following steps:

step 1), putting asphalt into a sealed container, heating to 95 ℃, keeping the temperature constant for 60min, pumping gas in the sealed container through a suction pump in the constant temperature process to enable the air pressure in the sealed container to be 0.05MPa, discharging the gas out of the sealed container through a suction pipe communicated with the sealed container, wrapping a constant temperature heating strip on the outer wall of the suction pipe, keeping the surface temperature of the suction pipe constant at 95 ℃, containing 10L of cooling water through the constant temperature container, keeping the cooling water constant at 30 ℃, inserting the air outlet end of the suction pipe into the cooling water, and enabling the pumped gas to be introduced into the cooling water to obtain a layering liquid, wherein the asphalt heated in the sealed container is preheated asphalt.

And 2) controlling the temperature of the layering liquid to be constant at 30 ℃, filtering through a 200-mesh screen, separating solid wax from oil and cooling water to obtain filtrate and filter residue, and collecting the filter residue for recycling.

Step 3), standing the filtrate for 60min, layering, and extracting supernatant for later use;

and 4), putting all the preheated asphalt in the sealed container in the step 1) and all the supernatant obtained in the step 3) into a stirring kettle, heating to 190 ℃, rotating at the speed of 60r/min, and stirring for 15min to fully mix oil components into the preheated asphalt to obtain the pretreated asphalt.

And 5), weighing 10kg of pretreated asphalt, 263kg of aggregate and 1.95kg of high-molecular modifier according to the formula proportion, putting into a stirring kettle, heating to 230 ℃, rotating at the speed of 120r/min, and stirring for 8min to obtain the asphalt concrete.

And 6), paving asphalt concrete on the pavement base, flattening by using a road roller, standing and maintaining until the surface temperature of the asphalt surface layer is reduced to 40 ℃, and thus obtaining the asphalt concrete pavement.

In the embodiment, the aggregate is a compound of crushed stone, sand and mineral powder, and the mass ratio of the crushed stone, the sand to the mineral powder is 18.25: 5.75: 1.

in this embodiment, the polymer modifier is a mixture of polyvinylpyrrolidone and polychlorotrifluoroethylene, and the mass ratio of polyvinylpyrrolidone to polychlorotrifluoroethylene is 1: 0.61.

example 2

Compared with the embodiment 1, the construction method of the asphalt concrete pavement only has the following differences:

in the step 1), putting asphalt into a sealed container, heating to 100 ℃, and keeping the temperature for 60 min; the surface temperature of the extraction pipe is constant at 100 ℃; the cooling water is kept constant at a temperature of 33 ℃.

In the step 2), the temperature of the layering liquid is controlled to be constant at 33 ℃, and the layering liquid is filtered through a 230-mesh screen.

In the step 4), the mixture is heated to 195 ℃, the rotating speed is 60r/min, and the mixture is stirred for 15 min.

In the step 5), the mixture is heated to 235 ℃, the rotating speed is 120r/min, and the mixture is stirred for 8 min.

Example 3

Compared with the embodiment 1, the construction method of the asphalt concrete pavement only has the following differences:

in the step 1), putting asphalt into a sealed container, heating to 105 ℃, and keeping the temperature for 60 min; the surface temperature of the extraction pipe is constant at 105 ℃; the cooling water is kept at a constant temperature of 35 ℃.

In the step 2), the temperature of the layering liquid is controlled to be constant at 35 ℃, and the layering liquid is filtered through a 270-mesh screen.

In the step 4), the mixture is heated to 200 ℃, the rotating speed is 60r/min, and the mixture is stirred for 15 min.

In the step 5), the mixture is heated to 240 ℃, the rotating speed is 120r/min, and the mixture is stirred for 8 min.

Example 4

Compared with the embodiment 1, the construction method of the asphalt concrete pavement only has the following differences:

in the step 5), 10kg of pretreated asphalt, 264kg of aggregate and 2.05kg of polymer modifier are weighed according to the formula proportion and put into a stirring kettle.

Example 5

Compared with the embodiment 1, the construction method of the asphalt concrete pavement only has the following differences:

in the step 5), 10kg of pretreated asphalt, 263.5kg of aggregate and 2kg of polymer modifier are weighed according to the formula proportion and put into a stirring kettle.

Example 6

Compared with the embodiment 5, the construction method of the asphalt concrete pavement only has the following differences:

in this embodiment, the polymer modifier is a mixture of polyvinylpyrrolidone and polychlorotrifluoroethylene, and the mass ratio of polyvinylpyrrolidone to polychlorotrifluoroethylene is 1: 0.65.

example 7

Compared with the embodiment 5, the construction method of the asphalt concrete pavement only has the following differences:

in this embodiment, the polymer modifier is a mixture of polyvinylpyrrolidone and polychlorotrifluoroethylene, and the mass ratio of polyvinylpyrrolidone to polychlorotrifluoroethylene is 1: 0.63.

example 8

Compared with the embodiment 5, the construction method of the asphalt concrete pavement only has the following differences:

in this embodiment, the polymer modifier is polyvinylpyrrolidone.

Example 9

Compared with the embodiment 5, the construction method of the asphalt concrete pavement only has the following differences:

in this embodiment, the polymer modifier is polychlorotrifluoroethylene.

Comparative example 1

A construction method of an asphalt concrete pavement comprises the following steps:

step 01), weighing 10kg of pretreated asphalt, 263.5kg of aggregate and 2kg of high-molecular modifier according to the formula proportion, putting the materials into a stirring kettle, heating to 230 ℃, rotating at the speed of 120r/min, and stirring for 8min to obtain the asphalt concrete.

And step 02), paving asphalt concrete on the pavement base, flattening by using a road roller, standing and maintaining until the surface temperature of the asphalt surface layer is reduced to 40 ℃, and thus obtaining the asphalt concrete pavement.

In the comparative example, the aggregate is a compound of crushed stone, sand and mineral powder, and the mass ratio of the crushed stone, the sand to the mineral powder is 18.25: 5.75: 1.

in the comparative example, the polymer modifier is a compound of polyvinylpyrrolidone and polychlorotrifluoroethylene, and the mass ratio of the polyvinylpyrrolidone to the polychlorotrifluoroethylene is 1: 0.61.

comparative example 2

Compared with the embodiment 5, the construction method of the asphalt concrete pavement only has the following differences:

in the step 5), the aggregate is used for replacing the polymer modifier in equal amount.

Comparative example 3

A construction method of an asphalt concrete pavement comprises the following steps:

step 01), weighing 10kg of pretreated asphalt and 265.5kg of aggregate according to the formula proportion, putting the materials into a stirring kettle, heating to 230 ℃, rotating at the speed of 120r/min, and stirring for 8min to obtain the asphalt concrete.

And step 02), paving asphalt concrete on the pavement base, flattening by using a road roller, standing and maintaining until the surface temperature of the asphalt surface layer is reduced to 40 ℃, and thus obtaining the asphalt concrete pavement.

In the comparative example, the aggregate is a compound of crushed stone, sand and mineral powder, and the mass ratio of the crushed stone, the sand to the mineral powder is 18.25: 5.75: 1.

experiment 1

The samples made of the asphalt concrete prepared in each example and comparative example were subjected to an asphalt mixture rutting test using a rutting machine under standard conditions of 60 ℃ and 0.7MPa, and the dynamic stability (times/mm) of the samples made of the asphalt concrete prepared in each example and comparative example was recorded.

Experiment 2

The asphalt concretes obtained in the examples and comparative examples were subjected to an asphalt brittleness test (frass method) by an asphalt brittleness tester, and the brittleness points of the test pieces prepared from the asphalt concretes obtained in the examples and comparative examples were recorded.

Experiment 3

The compressive strength of the samples prepared from the asphalt concrete prepared in each example and comparative example was measured according to ASTM D1074-2009 Standard test method for compressive Strength of asphalt mixture.

Experiment 4

The softening points of the samples prepared from the asphalt concretes prepared in the examples and comparative examples were measured according to GB/T4507-2014 asphalt softening point determination method (Ring and ball method).

Experiment 5

The ductility of the samples prepared from the asphalt concretes prepared in the examples and comparative examples was measured according to GB/T4508-2010 asphalt ductility determination.

Experiment 6

The penetration of the samples prepared from the asphalt concrete prepared in each example and comparative example was examined according to GB/T4509-2010 asphalt penetration test.

The specific assay data for experiments 1-6 are detailed in Table 2.

TABLE 2

According to the comparison of the data of the comparative example 1 and the comparative example 3 in the table 2, the dynamic stability and the compressive strength of the sample are improved by adding the polyvinylpyrrolidone and the polychlorotrifluoroethylene, and the structural stability of the prepared asphalt concrete pavement can be effectively improved; the brittle point of the sample is reduced to some extent, the softening point is increased to some extent, the applicable temperature range of the asphalt concrete pavement can be effectively increased, and meanwhile, the low-temperature use limit temperature of the polychlorotrifluoroethylene is far lower than the brittle point of the asphalt, so that the asphalt concrete pavement can be reinforced by the polychlorotrifluoroethylene even if the temperature of the asphalt concrete pavement reaches the brittle point temperature, and the asphalt concrete pavement still has strong structural stability and is not easy to crack when the environmental temperature is lower than the brittle point temperature; the ductility and the penetration of the sample are reduced, the processing performance of the asphalt concrete is influenced to a certain extent, and the ductility and the penetration of the sample are still kept within the qualified range.

According to the comparison of the data of the comparative example 2 and the comparative example 3 in the table 2, the content of the wax in the asphalt is reduced through pretreatment, the dynamic stability and the compressive strength of the sample are improved, and the structural stability of the prepared asphalt concrete pavement can be effectively improved; the brittleness point of the sample is greatly reduced, the softening point is greatly increased, and the applicable temperature range of the asphalt concrete pavement can be effectively increased; the ductility and the penetration of the sample are not changed greatly, and the processing performance of the asphalt concrete is not affected.

According to the comparison of the data of the embodiments 5 to 7 and the data of the embodiments 8 to 9, the polyvinylpyrrolidone or the polychlorotrifluoroethylene is added independently, the dynamic stability and the compressive strength of the sample are improved only a little, the brittle point is reduced only a little, and the softening point is increased only a little, and when the polyvinylpyrrolidone and the polychlorotrifluoroethylene are added simultaneously according to a specific proportion, the dynamic stability and the compressive strength of the sample are improved obviously, the brittle point is reduced obviously, and the softening point is increased obviously, so that the asphalt, the polyvinylpyrrolidone and the polychlorotrifluoroethylene are matched according to the specific proportion, the performance improvement effect on the asphalt is better, the prepared asphalt concrete pavement has a stable structure, the temperature application range is wider, and the application range of the asphalt concrete is effectively improved.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.