CN114057435B

CN114057435B - Storage-resistant cold-patch asphalt mixture and preparation method thereof

Info

Publication number: CN114057435B
Application number: CN202111252900.1A
Authority: CN
Inventors: 韦慧; 姚泽光; 周煜; 张虎; 张宇豪; 戴吟晗
Original assignee: Changsha University of Science and Technology
Current assignee: Changsha University of Science and Technology
Priority date: 2021-10-27
Filing date: 2021-10-27
Publication date: 2023-02-17
Anticipated expiration: 2041-10-27
Also published as: CN114057435A

Abstract

The invention discloses a storage-resistant cold patch asphalt mixture and a preparation method thereof, wherein the storage-resistant cold patch asphalt mixture is prepared from the following raw materials: aggregate, mineral powder and cold patch asphalt liquid; the cold patch asphalt liquid is prepared from the following raw materials: matrix petroleum asphalt, a diluent and an additive; the additive is prepared from the following raw materials: coconut oil diethanolamide, oleic acid, diethylene glycol; and (3) preheating a mixing pot, adding the aggregates subjected to heat preservation, the cold-patch asphalt liquid and the mineral powder into the mixing pot, and stirring to obtain the cold-patch asphalt mixture. The storage-resistant cold-patch asphalt mixture and the preparation method thereof enable the cold-patch asphalt mixture to have better durability and anti-stripping performance, greatly improve the low-temperature environment resistance and rainwater scouring resistance of the mixture, and pay more attention to the construction workability and storage stability of the material on the basis of ensuring the strength of the mixture.

Description

Storage-resistant cold-patch asphalt mixture and preparation method thereof

Technical Field

The invention belongs to the technical field of highway maintenance materials, and relates to a storage-resistant cold-patch asphalt mixture and a preparation method thereof.

Background

As a main pavement form of highways in China, the asphalt pavement has good mechanical property, durability and driving comfort. However, under the long-term influence of the driving load and the climate environment, the asphalt pavement is easy to have diseases such as looseness, cracks, pits and the like, the driving comfort of the asphalt pavement is influenced, the strength and the stability of a roadbed are influenced by erosion of rainwater and the like, the service life of the pavement is shortened, and therefore the pits and the grooves on the pavement are required to be repaired in time.

The existing road maintenance pit and groove repairing methods are mainly divided into a hot repair method and a cold repair method, and under the condition of large engineering quantity or centralized construction places, compared with a hot repair asphalt mixture, the cold repair asphalt mixture has the advantages of convenience and rapidness in construction, simple repairing process, small environmental pollution and the like, and is increasingly becoming a preferred material for repairing road surface pits.

The cold patch asphalt mixture is researched earlier abroad, the research content is wider, a plurality of products with excellent performance are developed, but the price is relatively high, and the maintenance and the application are difficult. A large amount of research is also carried out on cold patch asphalt mixtures in China, but the developed products have the disadvantages of good and uneven quality, obvious performance difference, particularly poor construction workability and storage stability, and the materials can be bonded into blocks after being stored for a certain time, so that the materials cannot be used.

The cold-patch asphalt mixture is used as a newly-developed pavement pit repairing material, a proper performance evaluation method is lacked, the current evaluation index is mainly based on the evaluation index of the hot-mix asphalt mixture, the Marshall stability is usually over-emphasized, the construction workability and the storage stability of the material are neglected, and the cold-patch asphalt mixture determines that the construction workability and the storage stability are the key factors of the performance of the mixture according to the characteristics of use and patch. Therefore, it is important to develop a cold-patch asphalt mixture with good construction workability and storage stability.

Disclosure of Invention

In order to achieve the purpose, the invention provides a storage-resistant cold patch asphalt mixture and a preparation method thereof, through the modification effect of an additive, the cold patch asphalt mixture has better durability and spalling resistance, meanwhile, the cold patch asphalt mixture can be tightly combined with the periphery of a pit groove, secondary diseases such as loosening and falling are not easy to generate, the capability of the cold patch asphalt mixture in resisting low-temperature environment and rainwater washing is greatly improved, and the problems of poor workability and caking after storage in the prior art are solved.

The technical scheme adopted by the invention is that the storage-resistant cold patch asphalt mixture is prepared from the following raw materials in parts by weight: 100 parts of aggregate, 2-4 parts of mineral powder and 4-6 parts of cold-patch asphalt liquid;

the cold patch asphalt liquid is prepared from the following raw materials in parts by weight: 100 parts of matrix petroleum asphalt, 22-28 parts of diluent and 3-5 parts of additive;

the additive is prepared from the following raw materials in parts by weight: 8 to 15 weight portions of coconut oil diethanolamide, 8 to 15 weight portions of oleic acid and 0.5 to 2 weight portions of diglycol.

Further, the aggregate is basalt with the grading of LB-13; the mineral powder is limestone mineral powder; the diluent is diesel oil.

Further, the raw materials for preparing the additive and the parts by weight thereof comprise: 10 parts of coconut oil diethanolamide, 10 parts of oleic acid and 1 part of diethylene glycol.

Still further, a method of preparing an additive comprising the steps of:

step A1, loading the coconut oil diethanolamide in parts by weight into a reaction kettle, adding oleic acid in parts by weight dropwise while stirring, wherein the reaction temperature is 75-85 ℃, and preserving heat for 5-10 min after all the oleic acid is added dropwise to obtain an intermediate product;

and step A2, dripping the diethylene glycol in parts by weight into the intermediate product while stirring the intermediate product obtained in the step A1, controlling the reaction temperature to be 80-90 ℃, continuously stirring the mixture at a stirring speed of 300-500 r/min at a temperature of 80-90 ℃ after the dripping is finished until the foam of the solution disappears, stopping the reaction after the color of the solution becomes amber, and cooling to normal temperature to obtain the additive.

Furthermore, in the step A1, the stirring speed is 400r/min to 600r/min, and the dropping time is 0.5h to 1h.

Furthermore, in the step A2, the stirring speed is 300r/min to 500r/min, and the dropping time is 10min to 15min.

Furthermore, the preparation method of the cold patch asphalt liquid comprises the following steps:

step B1, heating the matrix petroleum asphalt in parts by weight to 125-135 ℃ in an oven, then sequentially adding the heated matrix petroleum asphalt and the diluent in parts by weight into a reaction kettle, and placing the reaction kettle under a high-speed dispersion instrument for dispersing for 30-45 min to obtain asphalt diluent;

and step B2, slowly cooling the asphalt diluent obtained in the step B1 to 85-95 ℃, adding the additive in parts by weight into a reaction kettle, keeping the temperature of the reaction kettle at 85-95 ℃, and dispersing at the rotating speed of 500-600 r/min for 45-60 min to obtain the cold patch asphalt liquid.

Further, in step B1, the dispersing process conditions are: the temperature is 105-115 ℃ during dispersion, and the rotating speed is 500-600 r/min.

Another object of the present invention is to provide a method for preparing the storage-stable cold-patch asphalt mixture, which comprises the following steps:

step 1: keeping the aggregate and the mineral powder in parts by weight at the temperature of 80-90 ℃ for 3-4 h, and keeping the cold patch asphalt liquid in parts by weight at the temperature of 65-75 ℃ for 1-2 h;

and 2, step: preheating a mixing pot to 85 ℃, adding the aggregate subjected to heat preservation treatment into the mixing pot, and stirring for 90-120 s; adding the cold patch asphalt liquid subjected to heat preservation treatment into a mixing pot, and stirring for 90-120 s; and adding the mineral powder in parts by weight into a mixing pot, and stirring for 90-120 s to obtain the cold patch asphalt mixture.

Further, in the step 2, the stirring speed of the mixing pot is a fixed speed, and the mixing pot revolves at 48/min and rotates at 76/min.

The beneficial effects of the invention are: through the modification effect of the additive, the cold patch asphalt mixture has better durability and anti-stripping performance, the volatility test of the cold patch asphalt liquid reflects that the storage stability of the cold patch asphalt mixture is superior, meanwhile, the cold patch asphalt mixture can be tightly combined with the periphery of a pit groove, secondary diseases such as loosening and shedding are not easy to generate, and the capability of the cold patch asphalt mixture in resisting low-temperature environment and rainwater washing is greatly improved; the cold patch asphalt mixture is better focused on the construction workability and the storage stability of the material on the basis of ensuring the strength of the cold patch asphalt mixture, solves the problems of poor workability and caking after storage of the existing cold patch asphalt mixture, can achieve the requirements of long-term storage and follow-up patch, and has the advantages of low manufacturing cost, safety, environmental protection, simple construction process and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a flow chart of the preparation of the storage-resistant cold-patch asphalt mixture of the invention.

FIG. 2 is a blending forming diagram of the cold patch asphalt mixture according to the embodiment of the invention.

FIG. 3 is a graph of the cohesion test of the cold patch asphalt mixture according to the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A storage-resistant cold patch asphalt mixture is prepared from the following raw materials in parts by weight: 100 parts of aggregate, 2-4 parts of mineral powder and 4-6 parts of cold-patch asphalt liquid.

The aggregate is basalt with the grading of LB-13; the mineral powder is limestone mineral powder.

Clean, the granule is hard, the surface is coarse, have angular aggregate to this application selection. In a preferred embodiment of the application, the aggregate is a mixture of basalt coarse material with the grain size grading range of 2.36 mm-16 mm and basalt fine material with the grain size grading range of 0.075 mm-2.36 mm. The mixture composition is LB-13, and the aggregate passing percentage and the ingredient proportion of the mixture composition which is LB-13 are shown in Table 1.

TABLE 1 aggregate pass percentage and compounding ratio with grade LB-13

Mesh size	Upper limit of grading	Grading median value	Lower limit of grading	Design grading
					16mm	100％	100％	100％	100％
13.2mm	100％	95％	90％	95％
					9.5mm	95％	77.5％	60％	78％
4.75mm	60％	45％	30％	50％
					2.36mm	40％	25％	10％	24％
1.18mm	20％	12.5％	5％	13％
					0.6mm	15％	7.5％	0	9％
0.3mm	12％	6％	0	5％
					0.15mm	8％	4％	0	4％
0.075mm	5％	2.5％	0	3％

The cold patch asphalt liquid is prepared from the following raw materials in parts by weight: 100 parts of matrix petroleum asphalt, 22-28 parts of diluent and 3-5 parts of additive.

The diluent is diesel oil; the additive is prepared from the following raw materials in parts by weight: 8 to 15 weight portions of coconut oil diethanolamide, 8 to 15 weight portions of oleic acid and 0.5 to 2 weight portions of diglycol.

In a preferred embodiment of the invention, the additive is prepared from the following raw materials in parts by weight: 10 parts of coconut oil diethanolamide, 10 parts of oleic acid and 1 part of diethylene glycol.

In a preferred embodiment of the present application, the base petroleum asphalt is used as a main material for preparing the cold patch asphalt liquid, and the technical indexes of the base petroleum asphalt meet the specification requirements, as shown in table 2.

TABLE 2 technical index of the matrix petroleum asphalt of the present application

Index (es)	Specification requirements	Test results	Test method
				Penetration (25 ℃ C.) (100g, 5 s), 0.1mm	60～80	71	T0604
Penetration index PI	-1.5～1.0	-1.16	T0604
				Softening point (Ring and ball method) (. Degree. C.)	≥46	47.6	T0606
Dynamic viscosity (60 ℃) (Pa. S)	≥180	196	T0619
				Ductility (15 ℃,5 cm/min), cm	≥100	＞150	T0605
Solubility (trichloroethylene)%	＞99.5	99.89	T0607
				Flash point (open) (. Degree.C.)	≥260	319	T0611
Wax content (%)	≤2.2	1.6	T0615
				Density (15 ℃ C.) (g/cm) ³ )	—	1.026	T0603

In a preferred embodiment of the present application, the specifications of cocodiethanolamide meet the specification requirements, as shown in table 3.

Table 3 technical indices of coconut oil diethanolamide of the present application

Detecting items	The result of the detection
		Appearance (25 ℃ C.)	Light yellow transparent liquid
Solid content%	96.36
		Amine number, mgKOH/g	23.57
Color intensity	320
		pH value	9.67

In a preferred embodiment of the present application, the technical specification of oleic acid meets the specification, as shown in table 4.

TABLE 4 oleic acid technical index of the present application

Detecting items	The result of the detection
		Appearance of the product	Colorless transparent liquid
Melting point of DEG C	13.5
		Boiling point,. Degree.C	194.3
Density, g/mL	0.89
		Flash point, DEG C	＞113
Acid value, mg/g	197.8
		Freezing point, DEG C	0
Combustion residue (sulfate)%	0.03
		Iodine number	89

In a preferred embodiment of the present application, the specification of diethylene glycol is in compliance with the specification, as shown in table 5.

TABLE 5 diethylene glycol technical index of the present application

Detecting items	The result of the detection
		Appearance of the product	Colorless transparent liquid
Color intensity	3
		Specific gravity of 20/20 DEG C	1.1182
Water%	0.0072
		Boiling range (0.1013 MPa), 5Vol%, DEG C	244.9
Dry point, deg.C	246.1
		Acid content%	0.00081
Iron%	0.000001
		Ash content%	0.0008

The preparation method of the additive comprises the following steps:

step A1, loading the coconut oil diethanolamide in parts by weight into a reaction kettle, dripping the oleic acid in parts by weight while stirring, wherein the reaction temperature is 75-85 ℃, the reaction is carried out at the temperature, the reaction speed is moderate, the waiting time is short, the stirring speed is 400-600 r/min, the dripping time is 0.5-1 h, and the temperature is kept for 5-10 min after the oleic acid is completely dripped, so that an intermediate product is obtained, wherein the intermediate product is a light yellow transparent liquid;

and step A2, dripping the diethylene glycol in parts by weight into the intermediate product while stirring the intermediate product obtained in the step A1, starting dripping the diethylene glycol to generate foam, wherein the reaction temperature is 80-90 ℃, the stirring speed is 300-500 r/min, the dripping time is 10-15 min, stirring the mixture at the stirring speed of 300-500 r/min at the temperature of 80-90 ℃ for reaction until the foam of the solution disappears, stopping the reaction after the color of the solution becomes amber, and cooling to normal temperature to obtain amber viscous liquid, namely the additive.

The additive obtained in the step is used as a surfactant, the polarity of the matrix petroleum asphalt is improved in the process of preparing the cold patch asphalt liquid, the fluidity of the cold patch asphalt liquid at normal temperature or low temperature is improved, the diluent is diesel oil, the cost is low, the volatilization is slow, the prepared cold patch asphalt liquid is good in storage stability, the cold patch asphalt liquid and the aggregate are better combined in the process of preparing the storage-resistant cold patch asphalt mixture, and the fluidity is better.

The preparation method of the cold patch asphalt liquid comprises the following steps:

step B1, heating the matrix petroleum asphalt in parts by weight to 125-135 ℃ in an oven, then sequentially adding the heated matrix petroleum asphalt and the diluent in parts by weight (the diluent needs to be preheated in advance, the preheating temperature range is 85-95 ℃) into a reaction kettle, and placing the reaction kettle under a high-speed dispersion instrument to disperse for 30-45 min at the rotating speed of 500-600 r/min under the temperature condition of 105-115 ℃ to obtain asphalt diluent;

and step B2, slowly cooling the asphalt diluent obtained in the step B1 to 85-95 ℃, adding the additive in parts by weight into a reaction kettle, keeping the temperature of the reaction kettle at 85-95 ℃, dispersing for 45-60 min at the rotating speed of 500-600 r/min, and strictly controlling the temperature in the steps B1 and B2 by using an electric heating sleeve and a thermometer to obtain the cold patch asphalt liquid.

The application uses diesel oil as a diluent, the cost is low, the viscosity of the matrix petroleum asphalt is reduced, and the obtained asphalt diluent has fluidity at normal temperature or low temperature, so that the mixture has good construction workability, the volatilization of the diesel oil is slow, and the storage stability of the prepared cold patch asphalt liquid is better. The additive can effectively improve the polarity of matrix petroleum asphalt, and then improve the polarity of cold patch asphalt liquid, make the adhesiveness performance of cold patch asphalt liquid and aggregate better, keep the cohesion of cold patch asphalt mixture, prevent that moisture from invading from the interface, improve the intensity and the water stability of cold patch asphalt mixture, and the additive is dispersed evenly in the asphalt diluent who makes, and the nature of cold patch asphalt liquid is more stable.

As shown in fig. 1, the preparation method of the storage-resistant cold-patch asphalt mixture comprises the following steps:

step 1: putting the aggregate and the mineral powder in parts by weight into an oven at the temperature of 80-90 ℃ for heat preservation for 3-4 h, and putting the cold patch asphalt liquid in parts by weight into an oven at the temperature of 65-75 ℃ for heat preservation for 1-2 h;

The stirring speed of the stirring pot in the step is the fixed speed of the stirring pot, the revolution is 48/min, and the rotation is 76/min.

The storage-resistant cold patch asphalt mixture prepared by using the aggregate, the mineral powder and the asphalt diluent as raw materials has better storage stability, is not easy to condense into blocks under the condition of normal temperature or low temperature, keeps certain construction workability, ensures that the prepared storage-resistant cold patch asphalt mixture has certain strength after filling a pit slot and compacting and forming, and can bear the impact of vehicle load.

Example 1

Preparing an additive comprising the steps of:

(1) 1kg of coconut oil diethanolamide is put into a reaction kettle, 1kg of oleic acid is dripped while stirring, the reaction temperature is 75 ℃, the stirring speed is 400r/min, the dripping time is 0.5h, and the temperature is kept for 5min after all the oleic acid is dripped, so as to obtain an intermediate product;

(2) And B, while stirring the intermediate product obtained in the step A1, dripping 0.1kg of diethylene glycol into the intermediate product, stirring at the reaction temperature of 80 ℃, at the stirring speed of 300r/min for 10min, continuously stirring the mixture at the stirring speed of 300r/min under the temperature condition of 80 ℃ after the dripping is finished until the foam of the solution disappears, stopping the reaction after the color of the solution is changed into amber, and cooling to normal temperature to obtain the additive.

Example 2

Preparing an additive comprising the steps of:

(1) 1kg of coconut oil diethanolamide is put into a reaction kettle, 1kg of oleic acid is dripped while stirring, the reaction temperature is 85 ℃, the stirring speed is 600r/min, the dripping time is 1h, and the temperature is kept for 10min after all the oleic acid is dripped, so as to obtain an intermediate product;

(2) And B, while stirring the intermediate product obtained in the step A1, dripping 0.1kg of diethylene glycol into the intermediate product, stirring at the reaction temperature of 90 ℃, at the stirring speed of 500r/min for 15min, continuously stirring the mixture at the stirring speed of 500r/min under the temperature condition of 90 ℃ after the dripping is finished until the foam of the solution disappears, stopping the reaction after the color of the solution is changed into amber, and cooling to normal temperature to obtain the additive.

Example 3

Preparing an additive comprising the steps of:

(1) 1kg of coconut oil diethanolamide is put into a reaction kettle, 1kg of oleic acid is dripped while stirring, the reaction temperature is 80 ℃, the stirring speed is 500r/min, the dripping time is 0.75h, and the temperature is kept for 7.5min after all the oleic acid is dripped, so as to obtain an intermediate product;

(2) And B, while stirring the intermediate product obtained in the step A1, dripping 0.1kg of diethylene glycol into the intermediate product, stirring at the reaction temperature of 85 ℃, at the stirring speed of 400r/min for 12.5min, continuously stirring the mixture at the stirring speed of 400r/min at the temperature of 85 ℃ after the dripping is finished until the foam of the solution disappears, stopping the reaction after the color of the solution is changed into amber, and cooling to normal temperature to obtain the additive.

Example 4

Preparing an additive comprising the steps of:

the mass of the coconut oil diethanolamide in the step (1) is 0.8kg, and the mass of the oleic acid is 1.5kg;

(2) The mass of the medium diethylene glycol is 0.05kg;

the rest is the same as in example 1.

Example 5

Preparing an additive comprising the steps of:

in the step (1), the mass of the coconut oil diethanolamide is 1.5kg, and the mass of the oleic acid is 0.8kg;

(2) The mass of the medium diethylene glycol is 0.2kg;

the rest is the same as in example 1.

Example 6

Preparing an additive comprising the steps of:

except that the mass of the coconut oil diethanolamide in the step (1) is 1kg, and the mass of the oleic acid is 1.2kg;

(2) The mass of the medium diethylene glycol is 0.12kg;

the rest is the same as in example 1.

Example 7

(1) Heating 20kg of matrix petroleum asphalt in an oven to 125 ℃, then sequentially adding the heated matrix petroleum asphalt and 4.4kg of diesel oil into a reaction kettle, placing the reaction kettle under a high-speed dispersion instrument, and dispersing for 30min at the rotating speed of 500r/min under the temperature condition of 105 ℃ to obtain asphalt diluent;

(2) And slowly cooling the asphalt diluent to 85 ℃, adding 0.6kg of additive into the reaction kettle, keeping the temperature of the reaction kettle at 85 ℃, and dispersing at the rotating speed of 500r/min for 45min to obtain the cold patch asphalt liquid.

This example uses the additive prepared in example 1.

Example 8

(1) Heating 20kg of matrix petroleum asphalt in an oven to 135 ℃, then sequentially adding the heated matrix petroleum asphalt and 5.6kg of diesel oil into a reaction kettle, placing the reaction kettle under a high-speed dispersion instrument, and dispersing at the rotating speed of 600r/min for 45min under the temperature condition of 115 ℃ to obtain asphalt diluent;

(2) Slowly cooling the asphalt diluent to 95 ℃, adding 1kg of additive into a reaction kettle, keeping the temperature of the reaction kettle at 95 ℃, and dispersing at the rotating speed of 600r/min for 60min to obtain the cold patch asphalt liquid.

This example uses the additive prepared in example 2.

Example 9

(1) Heating 20kg of matrix petroleum asphalt in an oven to 130 ℃, then sequentially adding the heated matrix petroleum asphalt and 5kg of diesel oil into a reaction kettle, placing the reaction kettle under a high-speed dispersion instrument, and dispersing for 37.5min at the rotating speed of 550r/min under the temperature condition of 110 ℃ to obtain asphalt diluent;

(2) Slowly cooling the asphalt diluent to 90 ℃, adding 0.8kg of additive into the reaction kettle, keeping the temperature of the reaction kettle at 90 ℃, and dispersing at the rotating speed of 550r/min for 50min to obtain the cold patch asphalt liquid.

This example uses the additive prepared in example 3.

Example 10

except that the additive prepared in example 4 was used in this example;

the rest is the same as in example 7.

Example 11

except that the additive prepared in example 5 was used in this example;

the rest was the same as in example 7.

Example 12

except that the additive prepared in example 6 was used in this example;

the rest is the same as in example 7.

Example 13

The preparation method of the storage-resistant cold patch asphalt mixture comprises the following steps:

(1) Placing 100kg of basalt aggregate with the grading of LB-13 and 2kg of limestone mineral powder into an oven with the temperature of 80 ℃ for heat preservation for 3 hours, and placing 4kg of cold patch asphalt liquid into an oven with the temperature of 65 ℃ for heat preservation for 1 hour;

(2) Preheating a mixing pot to 85 ℃, adding the heat-preservation treated basalt aggregate with the LB-13 grade into the mixing pot, and stirring for 90s; adding the cold patch asphalt liquid subjected to heat preservation treatment into a mixing pot, and stirring for 90s; and adding the limestone ore powder into the mixing pot, and stirring for 90s to obtain the cold patch asphalt mixture. The stirring speed of the mixing pot is fixed, revolution is 48/min, and rotation is 76/min.

This example uses the cold patch asphalt from example 7.

As shown in fig. 2, the blending forming effect of the storage-stable cold patch asphalt mixture prepared in this embodiment is good, and as shown in fig. 3, the cohesiveness of the storage-stable cold patch asphalt mixture prepared in this embodiment is good.

Example 14

(1) Putting 100kg of basalt aggregate with the grading of LB-13 and 4kg of limestone mineral powder into a 90 ℃ oven, and preserving heat for 4h, and putting 6kg of cold patch asphalt liquid into a 75 ℃ oven, and preserving heat for 2h;

(2) Preheating a mixing pot to 85 ℃, adding the heat-preservation treated basalt aggregate with the LB-13 grade into the mixing pot, and stirring for 120s; adding the cold patch asphalt liquid subjected to heat preservation treatment into a mixing pot, and stirring for 120s; and adding the limestone mineral powder into the mixing pot, and stirring for 120s to obtain the cold patch asphalt mixture. The stirring speed of the mixing pot is a fixed speed, revolution is 48/min, and rotation is 76/min.

This example uses the cold patch asphalt solution from example 8.

Example 15

(1) Putting 100kg of basalt aggregate with the grading of LB-13 and 3kg of limestone mineral powder into an oven with the temperature of 85 ℃ for heat preservation for 3.5h, and putting 5kg of cold patch asphalt liquid into an oven with the temperature of 70 ℃ for heat preservation for 1.5h;

(2) Preheating a mixing pot to 85 ℃, adding the heat-preservation processed basalt aggregate with the LB-13 grading into the mixing pot, and stirring for 105s; adding the cold patch asphalt liquid subjected to heat preservation treatment into a mixing pot, and stirring for 105s; and adding the limestone ore powder into the mixing pot, and stirring for 105s to obtain the cold patch asphalt mixture. The stirring speed of the mixing pot is a fixed speed, revolution is 48/min, and rotation is 76/min.

This example uses the cold patch asphalt solution from example 9.

Example 16

The preparation method of the storage-resistant cold-patch asphalt mixture comprises the following steps:

except that the cold patch asphalt liquid prepared in example 10 was used in this example;

the rest was the same as in example 13.

Example 17

except that the cold patch asphalt solution prepared in example 11 was used in this example;

the rest is the same as in example 13.

Example 18

except that the cold patch asphalt liquid prepared in example 12 was used in this example;

the rest is the same as in example 13.

Example 19

the same procedures as in example 9 were repeated except that in (1), the mass of limestone ore powder was 2kg and the mass of cold patch asphalt liquid was 5 kg.

Example 20

the process was carried out in the same manner as in example 9 except that the mass of the limestone ore powder in (1) was 3kg and the mass of the cold patch asphalt liquid was 6 kg.

Example 21

the process was carried out in the same manner as in example 9 except that the mass of the limestone ore powder in (1) was 4kg and the mass of the cold patch asphalt liquid was 4 kg.

Comparative example 1

The preparation method of the cold patch asphalt mixture comprises the following steps:

the same as example 13 except that a cold patch asphalt mixture disclosed in chinese patent CN107117869A and a cold patch asphalt mixture in the preparation method thereof are used as a comparative example in (1).

Examples of the experiments

The storage-stable cold-patch asphalt mixtures of examples 13 to 21 and the cold-patch asphalt mixture of the comparative example were respectively tested for the adhesion, cohesion, initial strength, molding strength, marshall residual stability, freeze-thaw split ratio, dynamic stability, and storage stability indexes, and the test results are shown in tables 6 and 7.

Table 6 road performance test results for storage-stable cold-patch asphalt mixtures prepared in this application

As can be seen from Table 6, compared with the comparative example, the cold patch asphalt mixture prepared by the invention has lower mass loss rate and better strength, and the performance of the cold patch asphalt mixture is superior to that of the comparative example, so that the road performance after repair can be better improved, and the service life of the road can be prolonged. Meanwhile, the dynamic stability, the freeze-thaw splitting strength contrast and the residual stability are higher, the dynamic stability at the temperature of 60 ℃ is higher than 400 times/mm, the freeze-thaw splitting strength ratio is more than 85%, and the residual stability is higher than 90%, so that the high-low temperature performance and the water stability of the prepared cold patch asphalt mixture are better, and the cold patch asphalt mixture can be suitable for more regional climatic environments.

The storage-stable cold patch asphalt mixture obtained in example 13 was packed in bags and stored in a sealed state for 15 days, 30 days, 60 days and 90 days, and then the initial strength, the molding strength, the marshall residual stability and the workability were measured, and the test results are shown in table 7.

Table 7 storage stability test results of storage-resistant cold-patch asphalt mixture prepared in the examples of the present application

And finally, the construction workability of the storage-resistant cold-patch asphalt mixture prepared in the embodiment and the cold-patch asphalt mixture prepared in the comparative example is detected, the cold-patch asphalt mixture and the cold-patch asphalt mixture are stored for 24 hours in a refrigerator at minus 10 ℃ in a loose state without agglomeration and agglomeration, and the cold-patch asphalt mixture can be conveniently mixed and operated by using a shovel.

By combining the experimental examples, compared with the cold patch asphalt liquid prepared by the comparative example, the cold patch asphalt liquid prepared by the invention has stronger cohesiveness, higher initial and forming strength, better water temperature performance, better construction workability and better storage stability.

It should be noted that, in the present application, relational terms such as first, second and the like are used only for distinguishing one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on differences from other embodiments.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. The storage-resistant cold-patch asphalt mixture is characterized by being prepared from the following raw materials in parts by weight: 100 parts of aggregate, 2-4 parts of mineral powder and 4-6 parts of cold-patch asphalt liquid;

the additive is prepared from the following raw materials in parts by weight: 8-15 parts by weight of coconut oil diethanolamide, 8-15 parts by weight of oleic acid and 0.5-2 parts by weight of diethylene glycol;

the aggregate is basalt with the grading of LB-13; the mineral powder is limestone mineral powder; the diluent is diesel oil;

a process for preparing the additive comprising the steps of:

step A1, filling the coconut oil diethanolamide in parts by weight into a reaction kettle, and dripping oleic acid in parts by weight while stirring, wherein the reaction temperature is 75-85 ℃, and after all the oleic acid is dripped, keeping the temperature for 5-10 min to obtain an intermediate product;

step A2, dripping the diethylene glycol in parts by weight into the intermediate product while stirring the intermediate product obtained in the step A1, wherein the reaction temperature is 80-90 ℃, and after the dripping is finished, continuously stirring the mixture at a stirring speed of 300-500 r/min under the temperature condition of 80-90 ℃ until the foam of the solution disappears, stopping the reaction after the color is changed into amber, and cooling to the normal temperature to obtain the additive;

in the step A1, the stirring speed is 400 r/min-600 r/min, and the dropping time is 0.5 h-1h;

in the step A2, the stirring speed is 300 r/min-500 r/min, and the dropping time is 10min-15min;

b1, heating the matrix petroleum asphalt in parts by weight to 125-135 ℃ in an oven, then sequentially adding the heated matrix petroleum asphalt and the diluent in parts by weight into a reaction kettle, and placing the reaction kettle under a high-speed disperser for dispersing for 30min to 45min to obtain asphalt diluent;

step B2, slowly cooling the asphalt diluent in the step B1 to 85-95 ℃, adding the additive in parts by weight into a reaction kettle, keeping the temperature of the reaction kettle at 85-95 ℃, and dispersing for 45min to 60min at a rotating speed of 500r/min to 600r/min to obtain the cold patch asphalt liquid;

in the step B1, the dispersion process conditions are as follows: the temperature is 105-115 ℃ during dispersion, and the rotating speed is 500-600 r/min.

2. The storage-resistant cold-patch asphalt mixture according to claim 1, wherein the additive is prepared from the following raw materials in parts by weight: 10 parts of coconut oil diethanolamide, 10 parts of oleic acid and 1 part of diethylene glycol.

3. The preparation method of the storage-resistant cold patch asphalt mixture as claimed in any one of claims 1 to 2, which is characterized by comprising the following steps:

step 1: insulating aggregate and mineral powder in parts by weight for 3h to 4h at the temperature of 80-90 ℃, and insulating cold patch asphalt liquid in parts by weight for 1h to 2h at the temperature of 65-75 ℃;

step 2: preheating a mixing pot to 85 ℃, adding the heat-insulating aggregate into the mixing pot, and stirring for 90s to 120s; adding the cold patch asphalt liquid subjected to heat preservation treatment into a mixing pot, and stirring for 90s to 120s; and adding the mineral powder in parts by weight into a mixing pot, and stirring for 90s to 120s to obtain the cold patch asphalt mixture.

4. The method for preparing a storage-durable cold-patch asphalt mixture according to claim 3, wherein in the step 2, the stirring speed of the mixing pot is a fixed speed, revolution is 48/min, and rotation is 76/min.