High performance anti-rutting pavement base

Abstract

The application belongs to the technical field of road engineering construction, and particularly relates to a high-performance anti-rutting pavement base. The base body of the pavement base comprises an upper base body and a lower base body; the material of the upper base body is sand-free large-pore cement concrete, and the material of the lower base body is open-graded large-diameter asphalt mixture; a high-viscosity modified emulsified asphalt-based grouting material is grouted on the base body, thereby forming the high-performance anti-rutting pavement base. The high-performance anti-rutting pavement base has flexibility and rigidity, solves the problem of easy cracking of conventional semi-flexible pavement, effectively avoids diseases such as cracks in the pavement in a short period of time, and greatly prolongs the service life of the pavement.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of road engineering construction, and particularly relates to a high-performance rut-resistant pavement base. BACKGROUND

[0002] With the significant increase in the number and load of vehicles, higher requirements are put forward for the design and construction of highways, especially the highway pavement materials, and the traditional asphalt pavement and cement concrete pavement have been unable to meet the demand of the current traffic conditions on pavement materials.

[0003] The asphalt concrete pavement is prone to rutting under heavy load or high temperature conditions, which affects the flatness of the pavement. In the prior art, the rutting problem is generally solved by the following two methods: 1. adding an anti-rutting agent to the asphalt mixture in the surface layer of the asphalt pavement to form an anti-rutting layer; since various anti-rutting agents on the market are diverse, and most of the anti-rutting agents will age over time, the asphalt becomes hard and brittle at low temperature in winter. 2. directly using a cement concrete pavement. Although the cement concrete pavement with large rigidity can provide good anti-rutting performance, it has the disadvantages of difficult joint treatment, high maintenance cost, loud noise and easy dust generation.

[0004] Based on the above situation, semi-flexible pavement emerges as the times require. The materials used in the semi-flexible pavement currently mainly consist of coarse and fine aggregates (containing 20wt%-40wt% of sand), cement, cement-based grouting material and large-void asphalt mixture, and a high-strength composite anti-rutting structure is formed by pouring the cement-based grouting material into the large-void asphalt mixture, which has the characteristics of rigidity and flexibility. However, the existing cement-based grouting material poured asphalt concrete type semi-flexible pavement has low anti-deformation capacity and high brittleness of the cement-based grouting material itself, and is prone to cause large dry shrinkage and temperature shrinkage of the pavement when the humidity or temperature changes.

[0005] The traditional asphalt mixture semi-flexible pavement base filled with cement-based grouting material has the structure that the inorganic aggregate is wrapped by the organic asphalt to form the binder with organic flexible material, and then the cement is used to wrap the asphalt mixture as inorganic rigid material. In this way of wrapping the organic flexible material with inorganic rigid material, the bonding strength at the contact interface of the two materials with different properties is weak.

[0006] In addition, the cement and the water phase in the asphalt emulsion are prone to hydration reaction, and the rigid hydration products randomly distributed in the asphalt mortar increase the rigidity of the pavement base and the risk of cracking.

[0007] As can be seen from the above, the traditional cement-based grouting material for pouring asphalt concrete type semi-flexible pavement base has weak interfacial bonding strength between the asphalt-aggregate-cement-based grouting material inside, which leads to poor volume stability, and is prone to surface cracks, linear cracks, honeycomb holes, and pit slots and other diseases. Once cracks occur, the semi-flexible pavement loses its structural integrity and continuity, and under the combined action of vehicle load, rainwater infiltration, and alternating environmental temperature and other factors, the pavement structure is damaged early, and eventually structural damage occurs, which seriously affects the service performance and service life of the pavement.

[0008] CN103864374 discloses a semi-flexible pavement base material, which is composed of 20-75% aggregate, 22-75% cement-emulsified asphalt mortar, and 1-8% water. The cement-emulsified asphalt mortar comprises the following components and their weight percentages: 30-50% emulsified asphalt, 30-50% cement, 5-15% filler, 5-15% water, 0.01-0.05% additive, and 0.05-0.5% fiber. The semi-flexible pavement material has the following problems: the disclosed cement-emulsified asphalt mortar is a composite cementitious material composed of cement and emulsified asphalt as the binding material after mixing aggregate, cement-emulsified asphalt mortar, and water together, and its performance is mainly affected by cement and emulsified asphalt, which has strong temperature sensitivity and is greatly affected by environmental temperature and humidity. Moreover, the cement-emulsified asphalt mortar is formed by mixing aggregate, mortar, and water together, and the performance of the obtained mixture has unpredictable disadvantages such as shrinkage cracking, voiding, and chunking, which affect its service life.

[0009] CN101864717 discloses a semi-flexible base material and a preparation method. First, cement and aggregate are mixed uniformly, and then SBS modified emulsified asphalt and water are mixed uniformly to obtain a semi-flexible base material. The semi-flexible base material obtained by mixing rigid and flexible materials together in the way of plant-mixed complete mixing mixture reduces the risk of cracking to some extent, but the demulsification time cannot be guaranteed during transportation in large quantities, and the technical index of plant-mixed equipment is required to be high. SUMMARY

[0010] The present application aims to provide a high-performance anti-rutting pavement base to solve the above-mentioned problems. The high-performance anti-rutting pavement base is formed by pouring high-viscosity modified emulsified asphalt-based grouting material into the upper and lower matrices composed of open-graded large-diameter asphalt mixture and sand-free large-pore cement concrete. It has both flexibility and rigidity, solves the problem of easy cracking of conventional semi-flexible pavement, effectively avoids cracks and other diseases in the pavement in the short term, and greatly prolongs the service life of the pavement.

[0011] The innovation of the present application is that the inorganic stone material is cooperated with inorganic cement first, and then the high-viscosity modified emulsified asphalt-based grouting material is used to wrap the inorganic stone material to produce effect, which greatly improves the integrity and anti-stripping ability of the structure.

[0012] The specific technical solutions are as follows:

[0013] A high-performance anti-rutting pavement base, the base body of the pavement base comprises an upper base body and a lower base body; the upper base body material adopts sand-free large-pore cement concrete, and the lower base body material adopts open-graded large-diameter asphalt mixture; a high-viscosity modified emulsified asphalt-based grouting material is injected into the base body, thereby forming the high-performance anti-rutting pavement base.

[0014] The high-viscosity modified emulsified asphalt-based grouting material comprises the following raw materials in parts by weight: 100-120 parts of high-viscosity modified emulsified asphalt, 80-100 parts of mineral powder, and 0.1-0.2 parts of lignin fiber. If the amount of high-viscosity modified emulsified asphalt is less than 100 parts, the interlayer adhesion and void filling will be insufficient. If the amount of high-viscosity modified emulsified asphalt is more than 120 parts, the grouting material will be too weak and deformed, and the production cost will increase. In addition, the grouting material with the above-mentioned ratio is convenient for construction, can be mixed using existing mixing equipment, does not require other high-standard requirements, is highly convenient, and has low production cost.

[0015] The base body is composed of open-graded large-diameter asphalt mixture and sand-free large-pore cement concrete. Although the load-bearing capacity of sand-free large-pore cement concrete is much greater than that of asphalt mixture, the stress concentration of sand-free large-pore cement concrete is prone to cracking. Therefore, the lower base body material adopts open-graded large-diameter asphalt mixture, which is beneficial to stress release and reduces the risk of cracking. Simultaneously, the high-viscosity modified emulsified asphalt-based grouting material is used for grouting, and the upper and lower base bodies are simultaneously grouted to form an organic whole, which further prevents cracking caused by stress concentration and compensates for the disadvantage of insufficient flexibility of rigid pavement.

[0016] In traditional cement mortar, sand plays a role in filling and strengthening, and is used to fill the voids in concrete. However, the cement concrete of traditional cement mortar is completely rigid, and is prone to pavement cracking, surface damage, joint damage, deformation damage, and other diseases. The present application innovatively uses sand-free large-pore cement concrete, which discards the sand used for filling voids in traditional rigid cement concrete, and instead uses the high-viscosity modified emulsified asphalt-based grouting material. As a result, the overall structure is improved from rigid to semi-flexible, the compactness and tightness are improved, and the risk of shrinkage and cracking is reduced. At the same time, the incorporation of the high-viscosity modified emulsified asphalt-based grouting material increases the strength, stability, and durability of the cement concrete, improves the shear strength and impact resistance, and affects the workability of the cement concrete, improves the fluidity and plasticity.

[0017] Although the existing emulsified asphalt mortar has good adhesion, it has large flowability and low viscosity. If it is directly injected into the open-graded large-particle asphalt mixture matrix, the semi-flexible pavement structure as a whole is flexible, and under the action of load and temperature, it cannot play the role of anti-rutting at all. Moreover, the existing emulsified asphalt mortar has little effect on the adhesion of the matrix as a whole.

[0018] In the high-stickiness modified emulsified asphalt-based grouting material, the high-stickiness modified emulsified asphalt is used as a matrix, so that the whole is in a uniform and stable asphalt emulsion environment, and has good flowability at room temperature. The mineral powder is used as a reinforcing body and a grouting material skeleton, which increases the viscosity and toughness of the grouting material, and is beneficial to the adhesion between the grouting material and the structure layer. The lignin fiber is used as a processing aid, which improves the toughness of the grouting material and increases the crack resistance.

[0019] After the mineral powder is added to the high-stickiness modified emulsified asphalt, the content of the mortar in the high-stickiness modified emulsified asphalt is increased, and the Brookfield rotational viscosity is large. The interaction between the mineral powder and the high-stickiness modified emulsified asphalt greatly increases the cohesion and adhesion of the high-stickiness modified emulsified asphalt-based grouting material, thereby improving the adhesion of the grouting material to the aggregate in the large-pore structure layer.

[0020] In summary, the high-stickiness modified emulsified asphalt-based grouting material used in the present application can enhance the adhesion between the open-graded large-particle asphalt mixture and the large-pore cement concrete layer, ensure that the upper and lower matrices (large-particle open-graded asphalt mixture and sand-free large-pore cement concrete) are bonded into a whole, effectively fill the large voids, prevent further water infiltration, and improve the water damage resistance of the pavement. The viscosity of the grouting material is large, which significantly improves the self-healing ability of the whole and greatly improves the anti-rutting ability of the whole. The filling in the sand-free cement concrete plays a buffering role to prevent cracking, ensures the flatness after opening to traffic, guarantees the driving comfort, prolongs the service life of the road, and the performance of the grouting material is better than that of ordinary emulsified asphalt grouting material and cement-based grouting material.

[0021] In the present application, the mass ratio of the high-stickiness modified emulsified asphalt-based grouting material in the high-performance anti-rutting pavement base layer is 10-18:85-100. The mass of the matrix referred to herein is the sum of the mass of the upper matrix and the lower matrix.

[0022] If the high-stickiness modified emulsified asphalt-based grouting material is injected too much, not only the economic cost will increase, but also the amount of free asphalt on the surface will increase, and the anti-skid performance will decrease. If the grouting material is injected too little, the large voids cannot be fully filled, the structure is not dense, the pavement is prone to cracking, the interlayer adhesion is poor, the overall performance of the semi-flexible pavement is insufficient, the aggregate is prone to peeling, water seepage, and the durability is poor.

[0023] In the application, the tensile speed of the high-viscosity modified emulsified asphalt-based grouting material in the high-performance rut-resistant pavement base is 8-12 mm / min; the tensile strength at 25℃ is 2.5-3.3 MPa, and the shear strength is 2.8-3.5 MPa; under the determination conditions of a rotation speed of 10 ωrad / s, a strain of 1%, and a temperature of 64℃, the modulus G of the high-viscosity modified emulsified asphalt grouting material is greater than 3000 Pa, and the rut factor G* / sin(δ) is greater than 2800.

[0024] However, the modulus G of the commonly used cement-based emulsified asphalt grouting material is 2300-2800 Pa, and the rut factor G* / sin(δ) is less than 2500. The modulus G of the general SBS modified asphalt grouting material is about 2600 Pa, and the rut factor G* / sin(δ) is about 2700. The rut factor G* / sinδ is used to represent the high-temperature permanent deformation resistance of the asphalt material; the complex shear modulus G* represents the sum of the storage modulus (elasticity) component and the loss modulus (viscosity) component, and according to the data comparison, it can be seen that the high and low temperature performance of the high-viscosity modified emulsified asphalt grouting material is superior to that of the cement-based asphalt grouting material.

[0025] In the application, the high-viscosity modified emulsified asphalt in the high-viscosity modified emulsified asphalt-based grouting material in the high-performance rut-resistant pavement base is cationic emulsified asphalt, the demulsification speed (35ml, OT, 0.8%) is 30-70%, the Saybolt viscosity at 25℃ is 20-100 s, the evaporation residue is ≥60%, the penetration (100g, 25℃, 5s) is 60-150{0.1mm}, and the ductility (15℃) is ≥40 cm.

[0026] In the application, the gradation range of the sand-free large-pore cement concrete in the high-performance rut-resistant pavement base is as follows: the passing rate range of the standard sieve hole of 37.5 mm is 100%, the passing rate range of the standard sieve hole of 25 mm is 100%-90%, the passing rate range of the standard sieve hole of 12.5 mm is 60%-25%, the passing rate range of the standard sieve hole of 4.75 mm is 10%-0%, the passing rate range of the standard sieve hole of 2.36 mm is 5%-0%, and the passing rate range of the standard sieve hole of 0.075 mm is 2%-0%.

[0027] The cement of the sand-free large-pore cement concrete adopts P.O 42.5 cement, the cement dosage is 8%-12%, and the water-cement ratio is 0.39-0.43.

[0028] In the application, the compaction thickness of the sand-free large-pore cement concrete in the high-performance rut-resistant pavement base is 18-22 cm, the permeability coefficient is ≥2 cm / s, the 7d compressive strength is ≥8 MPa, and the void ratio is 20%-30%.

[0029] The biggest advantage of the structure of the application is that the high-viscosity modified emulsified asphalt-based grouting material fills the large-pore structure, so the thickness, porosity, permeability coefficient and compressive strength of the sand-free large-pore cement concrete used in the application are all coordinated with the high-viscosity modified emulsified asphalt-based grouting material. If the compaction thickness is less than 18 cm, the bearing capacity is insufficient, but if it is higher than 22 cm, it is not easy to be compacted. The permeability coefficient is not less than 2 cm / s, which is matched with the high-viscosity modified emulsified asphalt grouting material, and the high-viscosity modified emulsified asphalt grouting material is easy to be grouted. The 7d compressive strength is not less than 8 MPa, which can ensure the bearing capacity of the base. The porosity is 20%-30%, which can ensure that a sufficient amount of high-viscosity modified emulsified asphalt grouting material passes through and produces effect.

[0030] In the application, the grading range of the open-graded large-diameter asphalt mixture in the high-performance anti-rutting pavement base is as follows: the passing rate of the standard sieve hole of 31.5 mm is 100%, the passing rate range of the standard sieve hole of 26.5 mm is 95%-70%, the passing rate range of the standard sieve hole of 19 mm is 76%-40%, the passing rate range of the standard sieve hole of 13.2 mm is 58%-28%, the passing rate of the standard sieve hole of 9.5 mm is 39%-19%, the passing rate range of the standard sieve hole of 4.75 mm is 29%-6%, the passing rate range of the standard sieve hole of 1.18 mm is 15%-3%, the passing rate range of the standard sieve hole of 0.3 mm is 7%-1%, and the passing rate range of the standard sieve hole of 0.075 mm is 4%-1%.

[0031] The asphalt is SBS modified asphalt, and the asphalt content is 3%-3.3%.

[0032] In the application, the compaction thickness of the open-graded large-diameter asphalt mixture in the semi-flexible anti-rutting pavement is 8-12 cm; the porosity of the open-graded large-diameter asphalt mixture is 15%-20%; the asphalt film thickness is greater than 12 μm; the binder loss of the Surenburg asphalt leakage test is not less than 0.2%, and the mixture loss of the Kentaur flying test is not less than 20%.

[0033] In the application, the thickness of the high-performance anti-rutting pavement base is 28-32 cm.

[0034] The application has the advantages that the application is designed to take open-graded large-particle asphalt mixture layer and sand-free large-pore cement concrete as a base, and uses high-viscosity modified emulsified asphalt-based grouting material to fill the pores of the semi-flexible base, which is filled into the sand-free large-pore cement concrete and the open-graded large-pore asphalt mixture, and has the following effects: first, the original pure rigid cement concrete is modified into semi-flexible and its flatness and anti-stripping performance are improved; second, the open-graded large-particle asphalt mixture fills the pores to improve the overall cohesion; and third, the two structures are bonded into a whole to jointly bear force and work together. The application has the advantages of good fatigue resistance, high compressive and shear strength, no rutting, simple construction, and the like, and reduces the problems of rutting and other diseases caused by insufficient road surface structure bearing capacity and poor road surface material anti-deformation capacity.

[0035] (1) The grouting material is composed of mineral powder, lignin fiber and high-viscosity modified emulsified asphalt. After the emulsified asphalt and the mineral powder are fully mixed, the asphalt particles are adsorbed on the surface of the mineral powder particles and the lignin fiber to form a continuous asphalt film. The asphalt film and the components penetrate and interweave with each other to form a reticular composite structure with certain toughness. The grouting material composed of the modified high-viscosity emulsified asphalt, the mineral powder and the lignin fiber has good aggregation, enhanced density and less loose particles, thereby reducing the spacing of the aggregate. The surface of the aggregate is surrounded by the high-viscosity emulsified asphalt and the mineral powder, and the structure is relatively loose, the white smooth substance is less, the amount of free asphalt is relatively small, and the surface of the grout has large fluctuations. The interaction between the mineral powder and the high-viscosity modified emulsified asphalt in the high-viscosity modified emulsified asphalt grout greatly increases the cohesion and adhesion of the flexible asphalt grout, thereby improving the adhesion of the grout to the aggregate in the large-pore structure layer.

[0036] (2) The application has the advantages that the high-viscosity modified emulsified asphalt modified grouting material can ensure the bonding effect and fill the large-pore structure with high-viscosity and flexible material, greatly improve the anti-rutting capacity of the whole and prolong the service life of the road.

[0037] (3) The application solves the problems of limited strength, insufficient bearing capacity, poor anti-deformation capacity of the road surface material, and rutting and other diseases.

[0038] (4) The application solves the problem of easy cracking of the conventional semi-flexible road surface. Compared with the conventional semi-flexible road surface, the combined semi-flexible road surface base of the application is composed of open-graded large-particle asphalt mixture and sand-free large-pore cement concrete, and has the advantages of rigidity and flexibility, which avoids the cracking of the asphalt pavement caused by low rigidity and excessive bearing capacity, and avoids the cracking of the cement concrete pavement caused by high rigidity and easy shrinkage.

[0039] (5) The grouting material is high-viscosity emulsified asphalt glue, which has a short construction period and a simpler construction process compared to cement-based grouting materials.

[0040] In addition, the present application has the advantages that the modified emulsified asphalt grouting material is injected after the site paving of the sand-free large-pore cement concrete and the open-graded large-particle asphalt mixture, the modified emulsified asphalt has sufficient and reliable demulsification time, the influence of transportation cost and long-distance transportation is greatly reduced, the equipment for on-site injection is simpler than the mixing station, and the modified emulsified asphalt grouting material is convenient to transport. The semi-flexible pavement base formed has stronger interlayer (sand-free large-pore cement concrete and open-graded asphalt concrete) bonding effect, higher overall crack resistance, and more advantageous structural stability. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 The figure is a structural schematic diagram of the high-performance anti-rutting pavement base.

[0042] 1 is an upper base body, 2 is a lower base body, and 3 is a high-viscosity modified emulsified asphalt-based grouting material. DETAILED DESCRIPTION

[0043] The technical solutions of the present application will be described in detail below with reference to the drawings.

[0044] Example 1

[0045] The high-performance anti-rutting pavement base has an upper base body 1 and a lower base body 2; the upper base body material is sand-free large-pore cement concrete, the lower base body material is open-graded large-particle asphalt mixture, and the high-viscosity modified emulsified asphalt-based grouting material 3 is injected into the base body, thereby forming the high-performance anti-rutting pavement base.

[0046] The high-viscosity modified emulsified asphalt-based grouting material includes the following raw materials in parts by weight: 120 parts of high-viscosity modified emulsified asphalt, 90 parts of mineral powder, and 0.15 parts of lignin fiber.

[0047] The mass ratio of the high-viscosity modified emulsified asphalt-based grouting material to the base body is 15:90.

[0048] The sand-free large-pore cement concrete, the open-graded large-particle asphalt mixture, and the high-viscosity modified emulsified asphalt-based grouting material injection will be described in detail below.

[0049] 1. Sand-free large-pore cement concrete

[0050] The cement of the sand-free large-pore cement concrete is P.O 42.5 cement, the cement dosage is 10%, and the water-cement ratio is 0.41. The technical indicators of the cement need to meet the requirements in Table 1.

[0051] Table 1 Technical requirements for cement

[0052]

[0053] The gradation range of the sand-free macroporous cement concrete is as follows: the passing range of standard sieve hole 37.5mm is 100%, the passing range of standard sieve hole 25mm is 93.5%, the passing range of standard sieve hole 12.5mm is 48.7%, the passing range of standard sieve hole 4.75mm is 5.2%, the passing range of standard sieve hole 2.36mm is 3.3%, and the passing range of standard sieve hole 0.075mm is 1.8%.

[0054] The compaction thickness of the sand-free macroporous cement concrete is 20cm, the permeability coefficient is 3.4cm / s, the 7d compressive strength is 10MPa, and the void ratio is 26.4%.

[0055] 2. Open-graded large-particle asphalt mixture

[0056] The coarse aggregate should be clean, dry, weathered-free, impurity-free, and have sufficient strength and wear resistance, and the fine aggregate should be clean and dry, and each index requirement should meet the requirements of aggregate in the Technical Specification for Construction of Highway Asphalt Pavement (JTG F40-2004).

[0057] The open-graded large-particle asphalt mixture uses SBS modified asphalt, and the asphalt content is 3.1%, and the index requirement needs to meet the provisions in the Technical Specification for Construction of Highway Asphalt Pavement (JTG F40-2004).

[0058] The gradation range of the open-graded large-particle asphalt mixture is as follows: the passing range of standard sieve hole 31.5mm is 100%, the passing range of standard sieve hole 26.5mm is 92.4%, the passing range of standard sieve hole 19mm is 66.2%, the passing range of standard sieve hole 13.2mm is 43.5%, the passing range of standard sieve hole 9.5mm is 30.5%, the passing range of standard sieve hole 4.75mm is 14.8%, the passing range of standard sieve hole 1.18mm is 10.6%, the passing range of standard sieve hole 0.3mm is 4.2%, and the passing range of standard sieve hole 0.075mm is 2.5%.

[0059] The compaction thickness of the open-graded large-particle asphalt mixture is 10cm, the void ratio is 16.5%, the asphalt film thickness is 13.4μm, the binder loss of the Sarenburg asphalt leakage test is 0.12%, and the mixture loss of the Kentaur flying test is 12.4%.

[0060] 3. Grouting material

[0061] The technical requirements of the high-viscosity modified emulsified asphalt should meet the provisions of Table 2, and the mineral powder and the lignin fiber should meet the provisions in the Technical Specification for Construction of Highway Asphalt Pavement (JTG F40-2004).

[0062] Table 2 Quality technical requirements of the high-viscosity modified emulsified asphalt

[0063]

[0064] The tensile speed of the high-viscosity modified emulsified asphalt-based grouting material is 10 mm / min, the tensile strength at 25℃ is 2.5 MPa, the shear strength is 3.0 MPa, the modulus G of the high-viscosity modified emulsified asphalt grouting material is 3450.8 Pa, and the rut factor G* / sin(δ) is 3678.2 Pa under the determination conditions of 10 ωrad / s of rotational speed, 1% of strain, and 64℃ of temperature.

[0065] Example 2

[0066] The high-performance rut-resistant pavement base layer, wherein the high-viscosity modified emulsified asphalt-based grouting material comprises the following raw materials in parts by weight: high-viscosity modified emulsified asphalt 110 parts, mineral powder 82 parts, and lignin fiber 0.10 part.

[0067] The mass ratio of the high-viscosity modified emulsified asphalt-based grouting material to the matrix is 15:88.

[0068] The tensile speed of the high-viscosity modified emulsified asphalt-based grouting material is 10 mm / min, the tensile strength at 25℃ is 2.8 MPa, the shear strength is 3.4 MPa, the modulus G of the high-viscosity modified emulsified asphalt grouting material is 3562.1 Pa, and the rut factor G* / sin(δ) is 3780.4 Pa under the determination conditions of 10 ωrad / s of rotational speed, 1% of strain, and 64℃ of temperature.

[0069] Example 3

[0070] The high-performance rut-resistant pavement base layer, wherein the high-viscosity modified emulsified asphalt-based grouting material comprises the following raw materials in parts by weight: high-viscosity modified emulsified asphalt 115 parts, mineral powder 86 parts, and lignin fiber 0.13 part.

[0071] The mass ratio of the high-viscosity modified emulsified asphalt-based grouting material to the matrix is 10:86.

[0072] The tensile speed of the high-viscosity modified emulsified asphalt-based grouting material is 12 mm / min, the tensile strength at 25℃ is 3.0 MPa, the shear strength is 3.5 MPa, the modulus G of the high-viscosity modified emulsified asphalt grouting material is 3688.5 Pa, and the rut factor G* / sin(δ) is 3870.2 Pa under the determination conditions of 10 ωrad / s of rotational speed, 1% of strain, and 64℃ of temperature.

[0073] Comparative Example 1

[0074] The difference from Example 1 is that the high performance anti-rutting pavement base course, wherein the high viscosity modified emulsified asphalt based grouting material comprises the following raw materials by weight: high viscosity modified emulsified asphalt 120 parts, mineral powder 90 parts. No lignin fiber is added. The rest is the same as Example 1.

[0075] The tensile strength of the high viscosity modified emulsified asphalt based grouting material is 1.8 MPa at a tensile speed of 10 mm / min and a temperature of 25°C; the shear strength is 1.2 MPa; under the determination conditions of a rotation speed of 10 ωrad / s, a strain of 1%, and a temperature of 64°C, the modulus G of the high viscosity modified emulsified asphalt grouting material is 2028.5 Pa, and the rutting factor G* / sin(δ) is 2333.6 Pa.

[0076] Comparative Example 2

[0077] The difference from Example 1 is that the high performance anti-rutting pavement base course, wherein the high viscosity modified emulsified asphalt based grouting material comprises the following raw materials by weight: high viscosity modified emulsified asphalt 120 parts, lignin fiber 0.15 parts, and mineral powder 60 parts. The rest is the same as Example 1.

[0078] The tensile strength of the high viscosity modified emulsified asphalt based grouting material is 0.8 MPa at a tensile speed of 10 mm / min and a temperature of 25°C; the shear strength is 0.7 MPa; under the determination conditions of a rotation speed of 10 ωrad / s, a strain of 1%, and a temperature of 64°C, the modulus G of the high viscosity modified emulsified asphalt grouting material is 1106.2 Pa, and the rutting factor G* / sin(δ) is 1496.4 Pa.

[0079] Comparative Example 3

[0080] The difference from Example 1 is that the high performance anti-rutting pavement base course, wherein the high viscosity modified emulsified asphalt based grouting material comprises the following raw materials by weight: high viscosity modified emulsified asphalt 120 parts, mineral powder 130 parts, and lignin fiber 0.15 parts. The rest is the same as Example 1.

[0081] The tensile strength of the high viscosity modified emulsified asphalt based grouting material is 0.12 MPa at a tensile speed of 10 mm / min and a temperature of 25°C; the shear strength is 0.08 MPa; under the determination conditions of a rotation speed of 10 ωrad / s, a strain of 1%, and a temperature of 64°C, the modulus G of the high viscosity modified emulsified asphalt grouting material is 321.2 Pa, and the rutting factor G* / sin(δ) is 884.2 Pa.

[0082] Comparative Example 4

[0083] The difference between the example 1 is that the mass ratio of the high viscosity modified emulsified asphalt based grouting material: matrix is 20:90.

[0084] The tensile strength of the high viscosity modified emulsified asphalt based grouting material is 2.5 MPa at the tensile speed of 10 mm / min and the temperature of 25℃; the shear strength is 3.0 MPa; the modulus G of the high viscosity modified emulsified asphalt grouting material is 3450.8 Pa and the rut factor G* / sin(δ) is 3678.2 Pa under the determination conditions of the rotation speed of 10 ωrad / s, the strain of 1% and the temperature of 64℃.

[0085] If the high viscosity modified emulsified asphalt based grouting material is grouted too much, not only the economic cost is increased, but also the surface free asphalt is increased and the anti-skid performance is decreased. The anti-skid performance test is increased in the present comparative example. In the example 1, the pendulum value measured by the pendulum friction instrument is 63, the pendulum friction coefficient is 0.63 and the construction depth is 1.1. In the comparative example 4, the pendulum value measured by the pendulum friction instrument is 52, the pendulum friction coefficient is 0.52 and the construction depth is 0.7. It is proved that the anti-skid performance in the example 1 is better than that in the comparative example 4.

[0086] Comparative example 5

[0087] The grouting material is SBS modified asphalt grouting material

[0088] The high performance anti-rut road surface base layer, the matrix thereof comprises an upper matrix and a lower matrix; the upper matrix material is sand-free large-pore cement concrete and the lower matrix material is open-graded large-particle asphalt mixture; the SBS modified asphalt grouting material is grouted on the matrix to form the high performance anti-rut road surface base layer. The sand-free large-pore cement concrete and the open-graded large-particle asphalt mixture used are the same as those in the example 1.

[0089] The SBS modified asphalt grouting material comprises the following raw materials in parts by weight: SBS modified asphalt 120 parts, mineral powder 90 parts and lignin fiber 0.15 parts.

[0090] The mass ratio of the SBS modified asphalt grouting material: matrix is 15:90.

[0091] The technical requirements of the SBS modified asphalt in the SBS modified asphalt grouting material in the comparative example should meet the provisions in Table 3.

[0092] Table 3 Technical indexes of SBS modified asphalt

[0093]

[0094] The tensile speed of the SBS modified asphalt based grouting material is 10 mm / min; the tensile strength is 1.8 MPa and the shear strength is 2.2 MPa at 25°C; the modulus G of the SBS modified asphalt based grouting material is 2450.8 Pa and the rut factor G* / sin(δ) is 2778.2 Pa under the determination conditions of 10 ωrad / s of rotation speed, 1% of strain and 64°C of temperature.

[0095] The related performance indexes of the final high performance anti-rutting pavement base obtained in the above Examples 1-3 and Comparative Examples 1-5 are shown in Table 4.

[0096] Table 4 Performance indexes of the anti-rutting pavement base obtained in the Examples and Comparative Examples

[0097]

[0098]

Claims

1. A high performance anti-rut pavement base, characterized by, The base of the pavement base layer comprises an upper base and a lower base; the upper base material is sand-free large-pore cement concrete, and the lower base material is open-graded large-pore asphalt mixture; a high-viscosity modified emulsified asphalt-based grouting material is injected into the base to form the high-performance anti-rutting pavement base layer. The high-viscosity modified emulsified asphalt-based grouting material comprises the following raw materials in parts by weight: 100-120 parts of high-viscosity modified emulsified asphalt, 80-100 parts of mineral powder, and 0.1-0.2 parts of lignin fiber. The mass ratio of the high-viscosity modified emulsified asphalt-based grouting material to the base is 10-18:85-100. The tensile speed of the high-viscosity modified emulsified asphalt-based grouting material is 8-12 mm / min; the tensile strength at 25℃ is 2.5-3.3 MPa, the shear strength is 2.8-3.5 MPa; under the determination conditions of rotation speed 10 ωrad / s, strain 1%, and temperature 64℃, the modulus G of the high-viscosity modified emulsified asphalt grouting material is greater than 3000 Pa, and the rut factor G ＊ / sin(δ) is greater than 2800.

2. The high performance anti-rut pavement base of claim 1, wherein, The high-viscosity modified emulsified asphalt in the high-viscosity modified emulsified asphalt-based grouting material is a cationic emulsified asphalt. The demulsification speed of the cationic emulsified asphalt in a 35 mL OT solution system with a concentration of 0.8% is 30-70%. The Saybolt viscosity of the cationic emulsified asphalt at 25°C is 20-100 s, and the evaporation residue is ≥60%. The penetration of the cationic emulsified asphalt under the conditions of a 100 g load, 25°C, and 5 s is 60-150{0.1 mm}, and the elongation at 15°C is ≥40 cm.

3. The high performance anti-rut pavement base of claim 1, wherein, The gradation range of the sand-free large-pore cement concrete is as follows: the passing rate range of the standard sieve hole of 37.5 mm is 100%, the passing rate range of the standard sieve hole of 25 mm is 100%-90%, the passing rate range of the standard sieve hole of 12.5 mm is 60%-25%, the passing rate range of the standard sieve hole of 4.75 mm is 10%-0%, the passing rate range of the standard sieve hole of 2.36 mm is 5%-0%, and the passing rate range of the standard sieve hole of 0.075 mm is 2%-0%. The cement of the sand-free large-pore cement concrete is P.O 42.5 cement, and the cement dosage is 8%-12%, and the water-cement ratio is 0.39-0.

43.

4. The high performance anti-rut pavement base of claim 1, wherein, The compaction thickness of the sand-free large-pore cement concrete is 18-22 cm, the permeability coefficient is ≥2 cm / s, the 7d compressive strength is ≥8 MPa, and the void ratio is 20%-30%.

5. The high performance anti-rut pavement base of claim 1, wherein, The gradation range of the open-graded large-pore asphalt mixture is as follows: the passing rate range of the standard sieve hole of 31.5 mm is 100%, the passing rate range of the standard sieve hole of 26.5 mm is 95%-70%, the passing rate range of the standard sieve hole of 19 mm is 76%-40%, the passing rate range of the standard sieve hole of 13.2 mm is 58%-28%, the passing rate of the standard sieve hole of 9.5 mm is 39%-19%, the passing rate range of the standard sieve hole of 4.75 mm is 29%-6%, the passing rate range of the standard sieve hole of 1.18 mm is 15%-3%, the passing rate range of the standard sieve hole of 0.3 mm is 7%-1%, and the passing rate range of the standard sieve hole of 0.075 mm is 4%-1%. The asphalt is SBS modified asphalt, and the asphalt dosage is 3%-3.3%.

6. The high performance anti-rut pavement base of claim 1, wherein, The compaction thickness of the open-graded large-pore asphalt mixture is 8-12 cm, the void ratio is 15%-20%, the asphalt film thickness is >12 μm, the binder loss in the Sarenburg asphalt leakage test is ≤0.2%, and the mixture loss in the Kentaur flying test is ≤20%.

7. The high-performance rutting-resistant road base course according to claim 1, characterized in that, The thickness of the pavement base layer is 28-32 cm.

Images