CN101649067A - Thermal regenerant for asphalt concrete pavement and preparation method thereof - Google Patents

Abstract

The invention discloses a thermal regenerant for an asphalt concrete pavement, which is prepared form the following components in parts by weight: 40 to 60 parts of tung oil, 0.15 to 0.25 part of anhydrous AlCl3 and 2 to 4 parts of dimethyl phthalate. The invention also discloses a preparation method of the thermal regenerant, comprising the following steps: firstly dissolving the anhydrous AlCl3with anhydrous ethanol; adding the dissolved anhydrous AlCl3 into the tung oil and uniformly stirring to obtain the tung oil mixed solution; and finally, adding DOP into the tung oil mixed solution, carrying out reaction under 240 DEG C for 15 min to obtain the thermal regenerant. The invention overcomes the disadvantages of low utilization ratio, long construction period, low construction quality, poor stability of regenerant and high processing cost of an old asphalt pavement in the prior pavement regeneration technology.

Description

A kind of thermal regenerant for asphalt concrete pavement and preparation method thereof

Technical field

The present invention relates to the hot regeneration techniques of bituminous concrete pavement field, relate in particular to a kind of thermal regenerant for asphalt concrete pavement and preparation method thereof.

Background technology

At present, traditional asphalt pavement maintenance technology mainly contains dual mode, and a kind of is that the old asphalt pavement milling is removed, the newer bituminous concrete of making.Another is that old asphalt pavement is carried out cold regeneration, as the subbase on road surface.The main deficiency of above technology is:

1. a large amount of old asphalt mixtures go out of use, and building stones and pitch are caused very big waste, and environment is polluted;

2. on construction period, traditional asphalt maintenance of surface method for maintaining influences the normal current of road because operation is more, and the engineering time is longer;

3. from construction quality, when adopting traditional asphalt maintenance of surface method for maintaining to construct, the bituminous mixture laying of heat is on cold sub-layer, and and on every side contact interface all be cold compound, cause weak interface of interlayer and vertical cold joint seam like this, during construction these position compactnesss difficulty meet the demands.Like this, in case the seam punishment is improper, rainwater oozes under vertical cold seam crossing easily, is trapped in the pavement structure, and interlayer loose contact simultaneously causes the road surface slip resistance low, and holistic resistant behavior is relatively poor, has shortened the work-ing life of road

Also there is following deficiency in existing asphalt pavement regeneration agent:

1. regenerator character instability, volatilization easily;

2. complete processing more complicated, cost is higher, is difficult for producing in enormous quantities.

3. it is relatively poor to recover old asphalt performance effect, and additive capacity is bigger.

4. proterties compares thickness, is difficult for construction.

Summary of the invention

The object of the present invention is to provide a kind of can realize that old asphalt pavement utilizes on the spot again and again utilization ratio can reach 100%, simplify, shorten construction period, improve construction quality, stable in properties, thermal regenerant for asphalt concrete pavement that tooling cost is low, the present invention also provides a kind of preparation method of described thermal regenerant.

The technical solution used in the present invention is as follows to achieve these goals:

Thermal regenerant for asphalt concrete pavement of the present invention is made by corresponding weight part by following raw materials according: 40～60 parts of tung oil, anhydrous AlCl ₃0.15 2～4 parts of～0.25 parts, dimethyl phthalate (being called for short DOP).

The present invention also provides a kind of preparation method of described thermal regenerant for asphalt concrete pavement, and concrete steps are as follows:

The first step: according to the anhydrous AlCl of every 0.2g ₃The ratio of 10ml dehydrated alcohol is with anhydrous AlCl ₃Be dissolved in the dehydrated alcohol, and stir, fully dissolving;

Second step: mixing solutions is joined in the tung oil, start agitator, be stirred to till the milk sap, in the tung oil mixed solution, add DOP then, start agitator again and stir about 1min and get final product;

The 3rd step: in constant temperature oil bath, add thermal oil, and 240 ℃ of design temperatures, the at the uniform velocity stirring that in the process that heats up, keeps agitator;

The 4th step: liquid temp to be mixed reaches 240 ℃, behind the reaction 15min, mixed solution is taken out, and water-cooled is to normal temperature.

Beneficial effect of the present invention is as follows:

1. for existing asphalt pavement maintenance technical elements

1. realize the in-place regeneration utilization of old pipeline material, utilization ratio can reach 100%, economical environment-protective.

2. improved the pavement patching quality.When the in-situ heat regeneration technology is carried out the disease punishment, because disease zone and peripheral region are all heated, the repairing area and the thermal caking of side, bottom surface have all around been realized, weak seam and weak interface that original traditional punishment method exists have been eliminated, greatly improve the bonding force of repairing the new old pavement in back, improved the pavement patching quality.

3. improved the maintenance of surface working efficiency.Large-area heat regeneration construction, general use heat, turn, unit fleet that feeding, equipment such as pave are formed carries out the production line construction, speed of application is fast, open to traffic morning, greatly reduces the influence of pavement construction to traffic.

The maintenance construction of small area can once shaped, has avoided milling-clear groove-sprinkling sticking layer oil-production asphalt-more loaded down with trivial details operational procedure of the asphalt that paves,

2. for existing bituminous concrete pavement regenerator aspect

1. with respect to other regenerators, stable in properties.

The performance index of each regenerator of table 1

As can be seen from the above table, bitumen regenerant viscosity ratio of the present invention and mass loss rate all are minimum, illustrate that its character is the most stable.

2. complete processing is simple, produces in enormous quantities easily.

3. regeneration effect is obvious, and additive capacity is few, is 5%, and the bitumen regenerant of other types needs adding proportion all more than 10%.

4. the required prices of raw and semifnished materials are cheap.

Description of drawings

Fig. 1 is the preparation flow figure of thermal regenerant for asphalt concrete pavement of the present invention;

What Fig. 2 was each factor to the PI value influences coordinate analysis figure;

What Fig. 3 was each factor to ductility influences coordinate analysis figure.

Embodiment

The tung oil that the present invention selects for use, the performance index of DOP see Table 2 respectively, table 3

The character of table 2 tung oil

Index name	Index value
		Color and luster	Light yellow
Proportion (25 ℃)	??0.94
		The allusion quotation value	??1.66
Acid number	??6
		Light constituent content (%)	??15
Fragrance divides content (%)	??75

The character of table 3 dimethyl phthalate

Index name	Index value
		Color and luster	Colourless, transparent liquid
Proportion (25 ℃)	??1.05
		Flash-point (℃)	??175
Solvent temperature (℃)	??-40

In order to determine the amount of participating in of each component, according to the character of regenerator component and the performance requriements of regenerator, with tung oil (A) consumption, aluminum trichloride (anhydrous) (B) consumption, DOP (C) consumption is a principal element, determines 3 levels respectively, carries out the orthogonal test of three factors, three levels, each factor level sees Table 4, and test plan sees Table 5.

Table 4 factor level table

The factor	Level 1 (g)	Level 2 (g)	Level 3 (g)
				A: tung oil dosage	??40	??50	??60
??B：AlCl 3Dosage	??0.25	??0.2	??0.15
				C:DOP dosage	??2	??3	??4

Annotate: wherein anhydrous AlCl ₃10ml is according to the anhydrous AlCl of every 0.2g ₃The ratio dissolving of 10ml dehydrated alcohol.

The plan of table 5 orthogonal test

Test plan according to table 5 is tested, and at first prepares thermal regenerant, referring to accompanying drawing 1, according to the anhydrous AlCl of every 0.2g ₃The ratio of 10ml dehydrated alcohol is earlier with anhydrous AlCl ₃Be dissolved in the dehydrated alcohol, and be stirred to abundant dissolving; Then mixing solutions is joined in the tung oil, start agitator, be stirred to till the milk sap, in the tung oil mixed solution, add DOP then, after starting agitator again and stirring about 1min, in constant temperature oil bath, add thermal oil, and 240 ℃ of design temperatures, the at the uniform velocity stirring that in the process that heats up, keeps agitator, liquid temp to be mixed reaches 240 ℃, behind the reaction 15min, mixed solution is taken out, and water-cooled promptly makes thermal regenerant of the present invention to normal temperature.

To 5% join in the AH-70 aged asphalt in proportion by the thermal regenerant that each prescription makes,

Survey its 15 ℃, 25 ℃, 30 ℃ penetration degrees and 15 ℃ of ductilities, and with penetrative index and ductility as the experimental performance evaluation index.Test-results sees Table 6.

Table 6 orthogonal experiments

Analysis of experiments the results are shown in Table 7, wherein for the later data easy analysis 15 ℃ of ductility unifications is deducted 140.

The analysis of table 7 orthogonal experiments

Regenerator mainly improves the temperature-sensitive performance and the extension performance of aged asphalt, promptly recover PI value and ductility value and reach requirement, according among " asphalt highway construction technique normalizing " (JTG F40-2004) to the requirement of road bitumen commonly used, for the PI value between-1.8～+ 1.0,15 ℃ of ductility 〉=100cm, analytical table 6, table 7 test-results of 9 groups of experiments as can be seen all can reach this requirement, all can be used for the repairing of road.

In order to obtain optimized proportioning, further experimental result is analyzed below us.

By table 7 as can be seen, for the PI index, optimal scheme is A ₁B ₂C ₂, that is:

A1: the tung oil dosage first horizontal 40g

B2: anhydrous AlCl ₃The second horizontal 0.2g

The C2:DOP dosage second horizontal 3g

For the ductility index, optimal scheme is A ₃B ₂C ₂, that is:

A3: tung oil dosage the 3rd horizontal 60g

B2: anhydrous AlCl ₃The second horizontal 0.2g

The C2:DOP dosage second horizontal 3g

Two preferred plans and inconsistent in order to obtain two schemes that index is all favourable, adopt the overall equilbrium method to compare analysis.For the ease of analysis-by-synthesis, the level of each index with factor changed to come out with diagrammatic representation, referring to accompanying drawing 2, accompanying drawing 3.

Accompanying drawing 2, accompanying drawing 3 and table 7 are integrated analysis, and each factor of intuitive analysis is to the influence of each index.

1. tung oil (A) is to the influence of each index:

As can be seen from Table 7, for the PI value, the extreme difference of tung oil is maximum, that is to say that tung oil is the factor that the PI value has the greatest impact, and finds out from accompanying drawing 2, gets 40 best.To ductility, the extreme difference of tung oil is not maximum, is accessory factor, gets 60 o'clock ductilities and reaches maximum value, has reached 165.47cm but get 40 o'clock ductilities yet, meets the AH-70 bituminous fully and uses standard.Therefore, tung oil gets 40 for best.

2. anhydrous AlCl ₃(B) to the influence of each index:

As can be seen from Table 7, for two indexs, AlCl ₃Extreme difference be not maximum, all be than minor factor.Comprehensive accompanying drawing 2 and accompanying drawing 3, anhydrous as can be seen AlCl ₃Getting 0.2 is preferably.

3. DOP is to the influence of each index:

As can be seen from Table 7, for ductility, the extreme difference maximum of DOP, promptly it is the factor that influences the ductility maximum.As can be seen, it is 3 best that DOP gets from accompanying drawing 3.For the PI value, DOP is accessory factor, and as can be seen, it also is best getting 3 from accompanying drawing 2.Therefore, to get 3 be best to DOP.

By above analysis-by-synthesis, the optimization prescription that obtains regenerator of the present invention is:

Tung oil: 40g; Anhydrous AlCl ₃: the 0.2g+10ml dehydrated alcohol; DOP:3g.

The thermal regenerant for asphalt concrete pavement that uses the present invention to make carries out the road surface finishing, realizes as follows:

At first, use the road surface heating installation will need zone, the road surface heating of repairing, then the loose equipment of use rake will be through the rake pine of the road surface after the heating; Then, the dosage by 5% adds described thermal regenerant for asphalt concrete pavement, and mixes with the loose old pipeline material of rake; At last, revise reclaimed asphalt mixture, can pass through after rolling.

Claims (3)

1, a kind of thermal regenerant for asphalt concrete pavement is characterized in that: made by corresponding weight part by following raw materials according: 40～60 parts of tung oil, anhydrous AlCl ₃0.15 2～4 parts of～0.25 parts, dimethyl phthalate.

2, the described thermal regenerant for asphalt concrete pavement of claim 1, it is characterized in that: the add-on of described each component is as follows: 40 parts of tung oil, anhydrous AlCl ₃0.2 3 parts of part, dimethyl phthalates.

3, a kind of method for preparing claim 1 or 2 described thermal regenerants is characterized in that: comprise following steps:

The first step: according to the anhydrous AlCl of every 0.2g ₃The ratio of 10ml dehydrated alcohol is with anhydrous AlCl ₃Be dissolved in the dehydrated alcohol, and stir, fully dissolving;

Second step: mixing solutions is joined in the tung oil, start agitator, be stirred to till the milk sap, in the tung oil mixed solution, add DOP then, start agitator again and stir about 1min and get final product;

The 3rd step: in constant temperature oil bath, add thermal oil, and 240 ℃ of design temperatures, the at the uniform velocity stirring that in the process that heats up, keeps agitator;

The 4th step: liquid temp to be mixed reaches 240 ℃, behind the reaction 15min, mixed solution is taken out, and water-cooled is to normal temperature.

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