Formula design method, preparation method and use method of high-adhesiveness filler modifier for asphalt pavement

Abstract

The invention discloses a formula design method, a preparation method and a use method of a high-adhesiveness filler modifier for an asphalt pavement, comprising raw material selection, formula design and performance design of enhanced, anti-stripping and comprehensive filler modifiers, and also comprising preparation and use methods of the filler modifiers. According to the method, the technical properties and pavement performance of the filler modifier can be accurately controlled, and the requirements of standardized production, application and experimental research are met. According to the N-type reinforcing agent, the Marshall stability of the asphalt mixture can be improved by 15%-30%, and the splitting tensile strength can be improved by 20%-35%; the B-type anti-stripping agent can improve the immersion Marshall stability of the asphalt mixture by 10%-15% and improve the freeze-thaw splitting residual strength by 15%-20%; the C-type reinforcing agent has the advantages of reinforcement and stripping resistance, and can improve the Marshall stability under the standard condition and the soaking condition and the splitting tensile strength under the standard condition and the freezing and thawing condition at the same time.

Description

Technical Field

[0001] The present invention belongs to the technical field of production and application of fillers for asphalt pavements, and particularly relates to a formulation design, preparation and application method of a high-adhesion filler modifier for asphalt pavements. Background Art

[0002] The adhesion between asphalt and aggregates plays an important role in the strength and stability of asphalt mixtures. Polymer-modified asphalt can improve the viscosity of asphalt, but the improvement of the adhesion between asphalt and aggregates is limited; the anti-stripping agent only improves the interfacial bonding performance and does not fundamentally provide long-term guarantee for the adhesion between asphalt and aggregates; fillers such as cement and lime require a relatively high dosage to produce good modification effects, it is difficult to coordinate the road performance of asphalt mixtures, and it is easy to cause conflicts in the road performance of mixtures and generate performance defects.

[0003] There have been some studies on the surface energy and adhesion work of asphalt and aggregates at home and abroad, but the formulation design, preparation and application methods of high-adhesion filler enhancers for asphalt pavements have not been reported at home and abroad. Starting from the relationship between adhesion performance and mixture composition, the present invention proposes a formulation design, preparation and application method of a high-adhesion filler modifier for asphalt pavements, providing technical support for the development, preparation and application of modified fillers for asphalt pavements. Summary of the Invention

[0004] The purpose of the present invention is to propose a formulation design, preparation and use method of a high-adhesion filler modifier for asphalt pavements, providing technical support for the development, preparation and application of modified fillers for asphalt pavements.

[0005] The present invention is achieved through the following technical solutions:

[0006] A formulation design method of a high-adhesion filler modifier for asphalt pavements, including: raw material selection and formulation design;

[0007] The raw material selection includes: selection of reference filler, enhancer, anti-stripping agent and regulator;

[0008] The calcium carbonate content of the reference filler ≥ 95%, specific surface area 250 ± 30m 2 / kg, particle size distribution uniformity coefficient 1.20, average particle size 40 ± 5μm, oil absorption ≤ 15%, hydrophilic coefficient ≤ 0.65, plasticity index ≤ 4;

[0009] The adhesion work of the enhancer in air ≥ 98×10 -20 J, the adhesion work in water medium ≥ 60×10 -20 J, the main particle size is 10nm - 20nm, specific surface area (130 - 150)m 2 / g;

[0010] The adhesion work of the anti-stripping agent in air is ≥ 10×10 -20 J, and the adhesion work in aqueous medium is ≥ 1.5×10 - 20 J, the main particle size is ≤ 1000 nm, and the specific surface area is (10 - 30) m 2 / g;

[0011] The adhesion work of the regulator in air is ≥ 20×10 -20 J, and the adhesion work in aqueous medium is ≥ 10×10 -20 J;

[0012] The formulation design includes: the formulation design of the enhanced filler modifier (i.e., N-type enhancer) and the anti-stripping filler modifier (B-type anti-stripping agent);

[0013] The enhanced filler modifier is composed of an enhancer and a reference filler, and the mass ratio of the enhancer to the reference filler is 15% - 25%; preferably 20%;

[0014] The anti-stripping filler modifier is composed of an anti-stripping agent, a regulator and a reference filler; the mass ratio of the anti-stripping agent to the regulator is 9:1; the mass ratio of the anti-stripping agent to the reference filler is 20% - 40%; preferably 25%.

[0015] Furthermore, the reference filler is selected as limestone powder; the enhancer is selected as N100 grade carbon black; the anti-stripping agent is selected as slaked lime; the regulator is selected as sulfur.

[0016] Furthermore, the formulation design also includes the formulation design of the comprehensive filler modifier (C-type enhancer): the comprehensive filler modifier is composed of an enhancer, an anti-stripping agent, a regulator and a reference filler, the mass ratio of the enhancer to the anti-stripping agent is 1:1 - 1:2, the mass ratio of the anti-stripping agent to the regulator is 6:1, and the total mass of the enhancer, anti-stripping agent and regulator is 15% - 25% of the total mass of the reference filler, preferably 25%.

[0017] The present invention also provides a preparation method of the high-adhesion filler modifier for asphalt pavement as described above, including the preparation of the enhanced filler modifier and the preparation of the anti-stripping filler modifier;

[0018] The preparation of the enhanced filler modifier includes: accurately measuring the enhancer and the reference filler according to the ratio and mixing them evenly;

[0019] The preparation of the anti-stripping filler modifier includes: accurately measuring the anti-stripping agent, the regulator and the reference filler according to the ratio, first mixing the anti-stripping agent and the regulator evenly, and then mixing them with the reference filler evenly.

[0020] Furthermore, it also includes the preparation of a comprehensive filler modifier. The reinforcing agent, anti-stripping agent, regulator, and reference filler are accurately metered according to a proportion. First, the reinforcing agent, anti-stripping agent, and regulator are mixed evenly, and then they are mixed evenly with the reference filler.

[0021] In addition, the present invention also provides a method for using the high-adhesion filler modifier for the asphalt pavement, including a method for using the reinforcing filler modifier and a method for using the anti-stripping filler modifier.

[0022] The reinforcing filler modifier is used as an admixture by external addition or as a modified filler. When the reinforcing filler modifier is used as an admixture, it is used by the method of external addition, and the percentage of the reinforcing filler modifier in the total mass of the filler is 20% - 30%.

[0023] The anti-stripping filler modifier is used as an admixture by external addition or as a modified filler. When the anti-stripping filler modifier is used as an admixture, it is used by the method of external addition, and the percentage of the anti-stripping filler modifier in the total mass of the filler is 15% - 35%.

[0024] Furthermore, it also includes a method for using the comprehensive filler modifier. The comprehensive filler modifier is used as an admixture by external addition or as a modified filler.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1. The N-type reinforcing agent can increase the Marshall stability of the asphalt mixture by 15% - 30%, increase the splitting tensile strength by 20% - 35%, increase the Marshall residual stability and the freeze-thaw splitting residual strength ratio by more than 10%, and can save about 20% of the asphalt dosage when meeting the same strength and stability requirements.

[0027] 2. The B-type anti-stripping agent can increase the immersion Marshall stability of the asphalt mixture by 10% - 15%, increase the freeze-thaw splitting residual strength by 15% - 20%, and has a significant effect on improving the anti-stripping performance. When meeting the same strength and water stability requirements, it can save about 20% of the asphalt dosage.

[0028] 3. The C-type reinforcing agent combines the advantages of reinforcement and anti-stripping, can increase the Marshall stability and splitting tensile strength under standard conditions, and at the same time increase the residual stability and splitting tensile strength under immersion conditions, producing high-performance asphalt mixtures with excellent comprehensive performance. Description of the Drawings

[0029] Figure 1It shows the change of Marshall stability with the dosage of N-type enhancer. In the figure, N is the dosage of N-type enhancer, %; P is the Marshall stability, kN. The legend is NP0034. The first letter N represents the N-type enhancer, and the second letter P represents the Marshall stability. The first and second digits "00" represent the standard condition with a powder-bitumen ratio of 1.2. The third digit "3" represents an asphalt-aggregate ratio of 3%. The fourth digit "4" represents a void ratio of 4%, and the rest have the same meaning.

[0030] Figure 2 It shows the change of the splitting tensile strength of the mixture containing N-type enhancer with the powder-bitumen ratio. In the figure, f is the powder-bitumen ratio; f y is the splitting tensile strength, MPa. The legend is NF2034. The first letter N represents the N-type enhancer, and the second letter F represents the splitting tensile strength. The first group of digits "20" represents the dosage of N-type enhancer is 20%. The third digit "3" represents an asphalt-aggregate ratio of 3%. The fourth digit "4" represents a void ratio of 4%, and the rest have the same meaning.

[0031] Figure 3 It shows the change of the splitting tensile strength of the mixture containing N-type enhancer with the void ratio. In the figure, V p is the void ratio, %; f y is the splitting tensile strength, MPa. The legend is NF2030. The first letter N represents the N-type enhancer, and the second letter F represents the splitting tensile strength. The first group of digits "20" represents the dosage of N-type enhancer is 20%. The third digit "3" represents an asphalt-aggregate ratio of 3%, and the rest have the same meaning. The fourth digit "0" represents the standard condition with a powder-bitumen ratio of 1.2.

[0032] Figure 4 It shows the effect of the dosage of B-type anti-stripping agent on the splitting tensile strength. In the figure, B is the dosage of B-type anti-stripping agent, %; TSR is the freeze-thaw splitting residue strength ratio, %. The legend is TSR0034. TSR represents the freeze-thaw splitting residue strength ratio. The first group of digits "00" represents the standard condition. The third digit "3" represents an asphalt-aggregate ratio of 3%, and the fourth digit represents a void ratio of 4%, and the rest have the same meaning.

[0033] Figure 5 It shows the effect of the powder-bitumen ratio of the mixture containing B-type anti-stripping agent on the freeze-thaw splitting residue strength ratio. In the figure, f is the powder-bitumen ratio; TSR is the freeze-thaw splitting residue strength ratio, %. The legend is TSR15. The first group of letters "TSR" represents the freeze-thaw splitting residue strength ratio. The second digit "15" represents the dosage of B-type anti-stripping agent is 15%, and the rest have the same meaning.

[0034] Figure 6 It shows the effect of the void ratio on the splitting tensile strength of the mixture containing B-type anti-stripping agent. In the figure, V p is the void ratio, %; fy is the splitting tensile strength, in MPa. For the legend Fy2540, the first group of letters represents the splitting tensile strength; the first group of numbers "25" indicates that the dosage of the B-type anti-stripping agent is 25%; the 3rd digit "4" represents the asphalt-aggregate ratio of 4%, and the 4th digit "0" represents the standard condition. The legend TSR represents the freeze-thaw splitting residue strength ratio, expressed as a decimal; the rest have the same meaning. Specific implementation manners

[0035] The following will clearly and completely describe the implementation scheme of the present invention in combination with specific embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] The present invention provides a formula design, preparation and use method of a high-adhesion filler modifier for asphalt pavement. This method can accurately control the technical properties and road performance of the filler modifier, meeting the requirements of standardized production, application and experimental research of the filler modifier. The overall process of one implementation form is as follows: the formula design method of the filler modifier; the preparation method of the filler modifier; the use method of the filler modifier.

[0037] I. Formula design method of the filler modifier

[0038] The formula design method of a high-adhesion filler modifier for asphalt pavement proposed by the present invention includes: the selection of raw materials for the filler modifier and the formula design of the filler modifier.

[0039] 1. Selection of raw materials for the filler modifier, including the selection of a reference filler, a reinforcing agent, an anti-stripping agent and a regulator:

[0040] (1) The reference filler is selected as a filler with a single chemical composition and mineral composition, good adhesion performance with asphalt in air and water media, easy availability of raw materials and wide application. Limestone powder is preferably selected, with a calcium carbonate content ≥ 95%, a specific surface area of 250 ± 30 m 2 / kg, a particle distribution uniformity coefficient of 1.20, an average particle size of 40 ± 5 μm, an oil absorption ≤ 15%, a hydrophilic coefficient ≤ 0.65, and a plasticity index ≤ 4;

[0041] (2) The reinforcing agent is selected as a material with a large adhesion work in air and water media and a particle size in the nanoscale. N100 grade carbon black is preferably selected, with an adhesion work ≥ 98×10 -20 J in air and an adhesion work ≥ 60×10 -20 J in water media, a main particle size of 10 nm - 20 nm, and a specific surface area of (130 - 150) m 2 / g;

[0042] (3) The anti-stripping agent is selected as the filler with an adhesion work in the air not lower than that of the reference filler and a large adhesion work in the water medium. Light burned slaked lime is preferably used as the anti-stripping material, and its adhesion work in the air ≥ 10×10 -20 J, and its adhesion work in the water medium ≥ 1.5×10 -20 J. The main particle size is ≤ 1000 nm, and the specific surface area is (10 - 30) m 2 / g;

[0043] (4) The adhesion work of the regulator in the air ≥ 20×10 -20 J, and its adhesion work in the water medium ≥ 10×10 -20 J. Sulfur is preferably used as the regulator.

[0044] 2. The formulation design of the filler modifier includes the formulation design of the enhanced filler modifier, the anti-stripping filler modifier, and the comprehensive filler modifier:

[0045] (1) The enhanced filler modifier (i.e., N-type enhancer) is formulated according to the adhesion work, particle size, and enhancement performance requirements of the enhancer. The dosage of N100 grade carbon black is 15% - 25%, preferably 20%, that is, the mass ratio of the reference filler to the enhancer is 5:1;

[0046] (2) The anti-stripping filler modifier (i.e., B-type anti-stripping agent) is formulated according to the adhesion work and anti-stripping performance requirements of the raw materials in the water medium. The dosage of slaked lime is 20% - 40%, preferably 25%, that is, the ratio of the reference filler to the anti-stripping agent is 4:1;

[0047] (3) The comprehensive filler modifier (i.e., C-type enhancer) is comprehensively designed according to the enhancement requirements and anti-stripping requirements. The dosage of the enhancer is selected at the low limit, and the dosage of the anti-stripping agent is selected at the high limit.

[0048] 3. The performance design of the filler modifier includes the design of the enhanced filler modifier, the anti-stripping filler modifier, and the comprehensive filler modifier:

[0049] (1) The enhancement percentage of the enhanced filler modifier is calculated according to formula (1):

[0050]

[0051] In the formula, R is the enhancement percentage, %; x is the percentage of the enhancer in the filler mass, %; f is the powder-bitumen ratio; A ′ 12 is the adhesion work of the enhancer and asphalt, ×10 -20 J; A 12 is the adhesion work of the reference filler and asphalt, ×10 -20J; A is a constant related to asphalt, taking 0.15 when the penetration is 70 (0.1 mm); taking 0.10 when the penetration is 90 (0.1 mm); d is the particle diameter of the reinforcing agent, in nm.

[0052] (2) The immersion Marshall residual stability of the anti-stripping filler modifier mixture is calculated according to Equation (2).

[0053]

[0054] In the formula, MS is the Marshall residual stability, %; FL is the flow value of the Marshall test, in mm; D is the diameter of the Marshall specimen, in mm; A 132 is the adhesion work between asphalt and aggregates in the water medium, in J; A 12 is the adhesion work between asphalt and aggregates, in J; B 1 is the stripping degree of the immersion Marshall test, %.

[0055] (3) The freeze-thaw splitting residual strength ratio of the anti-stripping filler modifier mixture is calculated according to Equation (3):

[0056]

[0057] In the formula, TSR is the freeze-thaw splitting residual strength ratio, %; B 2 is the stripping rate of the freeze-thaw cycle test, %; A 132 is the adhesion work between asphalt and aggregates in the water medium, in J; A 12 is the adhesion work between asphalt and aggregates, in J.

[0058] The technical performance and enhancement effect of the enhanced filler modifier, anti-stripping filler modifier and comprehensive filler modifier shall meet the requirements of Table 1:

[0059] Table 1 Technical Requirements for Filler Modifiers

[0060]

[0061]

[0062] II. Preparation of Filler Modifier

[0063] The present invention provides a preparation method of a highly adhesive filler modifier for asphalt pavement, and the preparation of the filler modifier includes: preparation of enhanced filler modifier; preparation of anti-stripping filler modifier; preparation of comprehensive filler modifier.

[0064] 1. Preparation of enhanced filler modifier (i.e., N-type reinforcing agent), including raw material preparation, metering and mixing:

[0065] (1) The specific surface area and oil absorption value of N100 grade carbon black are detected according to GB / T3780.

[0066] (2) Prepare the reference filler as required;

[0067] (3) Accurately measure according to the mass ratio of N100 carbon black to the reference filler of 20:80, mix evenly, and prepare the enhanced filler modifier;

[0068] (4) The proportion of the enhanced filler modifier can be adjusted with reference to Figure 1 for adjustment.

[0069] 2. Preparation of the anti-stripping filler modifier (i.e., Type B anti-stripping agent), including raw material preparation, measurement, and mixing:

[0070] (1) Industrial calcium oxide is inspected according to Class I and Class III industrial calcium oxide of HG / T4025, and then slaked according to the ratio of lime to water of 100:30;

[0071] (2) The regulator is selected as the solid product of industrial sulfur conforming to GB / T2449.1, and all technical indicators meet the requirements above the qualified product level;

[0072] (3) Accurately measure and mix evenly according to the mass ratio of slaked lime: industrial sulfur of 90:10, and then accurately measure and mix evenly according to the mass ratio of the sum of the masses of slaked lime and industrial sulfur: reference filler of 30:70 to prepare the anti-stripping filler modifier;

[0073] (4) The proportion of the anti-stripping filler modifier can be adjusted with reference to Figure 4 for adjustment.

[0074] 3. Preparation of the comprehensive filler modifier (i.e., Type C enhancer), including raw material preparation, measurement, and mixing:

[0075] (1) Select N100 carbon black, slaked lime, and industrial sulfur as the raw materials for the comprehensive filler modifier, and prepare and inspect according to the relevant technical requirements of the present invention;

[0076] (2) Accurately measure according to the mass ratio of N100 carbon black: slaked lime: industrial sulfur of 12:24:4, mix evenly, and obtain the comprehensive anti-stripping agent;

[0077] (3) Accurately measure according to the mass ratio of the comprehensive anti-stripping agent to the reference filler of 20:80, mix evenly, and obtain the comprehensive filler modifier.

[0078] III. Usage method of the filler modifier

[0079] The present invention provides a usage method of a high-adhesion filler modifier for asphalt pavement, including: the usage method of the enhanced filler modifier; the usage method of the anti-stripping filler modifier; the usage method of the comprehensive filler modifier.

[0080] 1. Method of using enhanced filler modifier (N-type enhancer), including: being used as an external admixture; being used as a modified filler:

[0081] (1) When the enhanced filler modifier is used as an external admixture, it is used by the method of external addition. The percentage of the enhanced filler modifier in the total mass of the filler is 20% - 30%; according to the enhancement requirements, the powder-bitumen ratio of the asphalt mixture including the modified filler can be referred to Figure 2 for determination, and the void ratio of the mixture can be referred to Figure 3 for determination;

[0082] (2) When the enhanced modifier is used as a modified filler, the mass ratio of the modified filler to asphalt can be referred to Figure 2 for determination, and the void ratio of the mixture can be referred to Figure 3 for determination.

[0083] 2. Method of using anti-stripping filler modifier (Type B anti-stripping agent), including: being used as an external admixture; being used as a modified filler:

[0084] (1) When the anti-stripping filler modifier is used as an external admixture, it is used by the method of external addition. The percentage of the anti-stripping filler modifier in the total mass of the filler is 15% - 35%; according to the anti-stripping performance requirements, the powder-bitumen ratio of the asphalt mixture including the modified filler can be referred to Figure 5 for determination, and the void ratio can be referred to Figure 6 for determination;

[0085] (2) When the anti-stripping filler modifier is used as a modified filler, the mass ratio of the modified filler to asphalt can be referred to Figure 5 for determination, and the void ratio of the mixture can be referred to Figure 6 for determination.

[0086] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for formulating a high-adhesion filler modifier for asphalt pavement, characterized in that: include: Raw material selection and formulation design; The raw material selection includes: the selection of reference fillers, reinforcing agents, anti-stripping agents and regulators; The calcium carbonate content of the reference filler is ≥95%, and the specific surface area is 250±30m 2 / kg, particle distribution uniformity coefficient 1.20, average particle size 40±5μm, oil absorption ≤15%, hydrophilicity ≤0.65, plasticity index ≤4; The adhesion work of the enhancer in air is ≥98×10 -20 J, adhesion work in water medium ≥ 60×10 -20 J, the main particle size is 10nm~20nm, the specific surface area is (130~150)m 2 / g; The adhesion work of the anti-stripping agent in air is ≥10×10 -20 J, adhesion work in water medium ≥1.5×10 -20 J, main particle size is ≤1000nm, specific surface area is (10~30)m 2 / g; The adhesion work of the regulator in air is ≥20×10 -20 J, adhesion work in water medium ≥10×10 -20 J; The formula design includes: the formula design of the reinforcing filler modifier and the formula design of the anti-stripping filler modifier; The reinforced filler modifier is a mixture of a reinforcing agent and a reference filler, wherein the mass ratio of the reinforcing agent to the reference filler is 15% to 25%; The anti-stripping filler modifier is prepared by mixing an anti-stripping agent, a regulator and a reference filler; the mass ratio of the anti-stripping agent to the regulator is 9:1; and the mass ratio of the anti-stripping agent to the reference filler is 20% to 40%.

2. The method for formulating a high-adhesion filler modifier for asphalt pavement according to claim 1, characterized in that: The reference filler is limestone powder; the reinforcing agent is N100 grade carbon black; the anti-stripping agent is slaked lime; and the regulating agent is sulfur.

3. The method for formulating a high-adhesion filler modifier for asphalt pavement according to claim 1, characterized in that: The formula design also includes the formula design of a comprehensive filler modifier: the comprehensive filler modifier is mixed with a reinforcing agent, an anti-stripping agent, a regulator and a reference filler, the mass ratio of the reinforcing agent to the anti-stripping agent is 1:1 to 1:2, the mass ratio of the anti-stripping agent to the regulator is 6:1, and the total mass of the reinforcing agent, the anti-stripping agent and the regulator is 15% to 25% of the total mass of the reference filler.

4. A method for preparing a high-adhesion filler modifier for asphalt pavement obtained by the formula design method of the high-adhesion filler modifier for asphalt pavement according to claim 1, characterized in that: Including the preparation of reinforcing filler modifier and the preparation of anti-stripping filler modifier; The preparation of the reinforcing filler modifier comprises: accurately measuring the reinforcing agent and the reference filler in proportion and mixing them uniformly; The preparation of the anti-stripping filler modifier comprises: accurately measuring the anti-stripping agent, the regulator and the reference filler according to a proportion, firstly mixing the anti-stripping agent and the regulator evenly, and then mixing them evenly with the reference filler.

5. The preparation method according to claim 4, characterized in that: The method also includes the preparation of a comprehensive filler modifier, which includes accurately measuring the reinforcing agent, anti-stripping agent, regulating agent and reference filler in proportion, firstly mixing the reinforcing agent, anti-stripping agent and regulating agent evenly, and then mixing them evenly with the reference filler.

6. A method for using a high-adhesion filler modifier for asphalt pavement obtained by the formula design method for a high-adhesion filler modifier for asphalt pavement according to claim 1, characterized in that: Including the use method of the reinforcing filler modifier and the use method of the anti-stripping filler modifier; The reinforced filler modifier is used as an external admixture or as a modified filler; when the reinforced filler modifier is used as an external admixture, it is used by external admixture, and the percentage of the reinforced filler modifier to the total mass of the filler is 20% to 30%; The anti-stripping filler modifier is used as an external admixture or as a modified filler; when the anti-stripping filler modifier is used as an external admixture, the percentage of the anti-stripping filler modifier in the total mass of the filler is 15% to 35%.

7. The method of use according to claim 6, characterized in that: It also includes a method for using a comprehensive filler modifier, where the comprehensive filler modifier is used as an external additive or as a modified filler.

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