Concrete slab roughening treatment design method

Abstract

The invention provides a concrete slab roughening treatment design method. The concrete slab roughening treatment design method comprises the steps that a concrete slab roughening treatment mode is drawn up; design parameters of different roughening treatment modes are drawn up; calculating the area roughening coefficient mu S of the concrete slab; drawing up the type and dosage Qn of the waterproof bonding layer; calculating an interlayer shear strength design value tau s; whether the design value of the interlayer shear strength is larger than or equal to the minimum value of the interlayer shear strength or not is determined; if the design value of the interlayer shear strength is larger than or equal to the minimum value of the interlayer shear strength, concrete slab roughening design is completed; and if the design value of the interlayer shear strength is smaller than the minimum value of the interlayer shear strength, the operation is repeated until the requirement that the design value of the interlayer shear strength is larger than or equal to the minimum value of the interlayer shear strength is met. According to the method, the roughening treatment quality of the concrete slab of the rigid-flexible composite long-service-life pavement can be accurately controlled before construction, so that it is guaranteed that the interlayer shear strength meets the design requirement, and the diseases such as interlayer shear displacement, asphalt layer pushing and upheaval are avoided.

Description

Technical Field

[0001] The present application relates to the field of road construction, and in particular to a design method for roughening a concrete slab. Background Art

[0002] With the rapid development of road construction in my country, rigid-flexible composite long-life pavement has been widely used throughout the country for its superior performance. Interlayer bonding is the weak point of rigid-flexible composite pavement. In the composite pavement structure, the strength between the cement concrete layer and the asphalt layer mainly depends on the friction formed by the surface of the asphalt layer and the cement concrete layer, and the bonding force of the interlayer binder to resist the shear stress, while the strength inside the ordinary asphalt layer mainly comes from the embedding effect of the aggregate. Therefore, the shear resistance of the interlayer is relatively weak, and interlayer shear displacement is prone to occur. In severe cases, the asphalt layer will form displacement, bulging, cracking and sliding, resulting in the destruction of the function of the asphalt layer. This requires that the asphalt layer and the cement concrete layer must have good interlayer shear strength.

[0003] Usually, waterproof bonding layer and other interlayer binders are used between asphalt layer and cement concrete layer to improve interlayer shear strength through bonding and embedding effect. Roughening the concrete layer can effectively improve the embedding effect between interlayer binders and cement concrete layers.

[0004] At present, the roughening treatment methods include roughening, shot blasting, milling, etc., but the quality of these roughening treatments is closely related to the level of construction equipment, construction personnel, etc., and it is difficult to accurately control the quality of roughening treatment. Summary of the invention

[0005] The present application provides a concrete slab roughening treatment design method, which is suitable for the design of rigid-flexible composite long-life pavement, and aims to accurately control the roughening treatment quality of the concrete layer of the rigid-flexible composite long-life pavement, thereby ensuring the shear strength between layers and reducing asphalt layer diseases.

[0006] The technical solution of this application is:

[0007] A concrete slab roughening treatment design method, which is applicable to the design of rigid-flexible composite long-life pavement, comprises the following steps:

[0008] S1, propose a method for roughening the concrete slab;

[0009] S2, formulate design parameters for different roughening treatment methods;

[0010] S3, calculation of the concrete slab area roughening coefficient μ S ;

[0011] S4, propose the type and amount of waterproof bonding layer Q n ;

[0012] S5, calculate the design value of interlayer shear strength τ s ;

[0013] S6, determine whether the design value of the interlayer shear strength is greater than or equal to the minimum value of the interlayer shear strength: if the design value of the interlayer shear strength is greater than or equal to the minimum value of the interlayer shear strength, the design of the concrete slab roughening treatment is completed; if the design value of the interlayer shear strength is less than the minimum value of the interlayer shear strength, repeat the operations in S2 to S5 until the requirement that the design value of the interlayer shear strength is greater than or equal to the minimum value of the interlayer shear strength is met.

[0014] As a technical solution of the present application, in step S1, the concrete slab layer roughening treatment method includes roughening, shot blasting and milling.

[0015] As a technical solution of the present application, in step S2, for different roughening treatment methods, the design parameters are shown in the following table:

[0016]

[0017] As a technical solution of the present application, in step S3, the concrete slab area roughening coefficient μ S Characterize the degree of roughening of concrete slabs, and calculate according to the following table for different roughening treatment methods:

[0018]

[0019] Where: is the average roughening depth, is the average roughening distance; Q2 is the shot ejection flow rate; ρ2=7.85g / cm 3 ; is the average shot blasting depth; is the average milling depth; is the average milling texture spacing.

[0020] As a technical solution of the present application, in step S4, the types of waterproof bonding layers include ordinary asphalt, SBS modified asphalt, and rubber asphalt; the amounts of different types of waterproof bonding layers under different roughening treatment methods are shown in the following table:

[0021]

[0022] As a technical solution of the present application, in step S5, the interlaminar shear strength design value τ is calculated according to the following formula: s :

[0023]

[0024] Where: γ m is the waterproof bonding layer type coefficient; Qn is the amount of waterproof adhesive layer; μ S is the area roughening coefficient of the concrete slab;

[0025] Among them, γ m The value range of is shown in the following table:

[0026]

[0027] As a technical solution of the present application, in step S6, the interlayer shear strength design value τ s and the minimum interlaminar shear strength τ min The design of concrete slab roughening treatment is completed when the following requirements are met:

[0028] τ s ≥τ min ;

[0029] Among them, τ min The value range of is shown in the following table:

[0030]

[0031] Beneficial effects of this application:

[0032] The present application provides a concrete slab roughening treatment design method, which can accurately control the quality of concrete slab roughening treatment of rigid-flexible composite long-life pavement before construction, thereby ensuring that the interlayer shear strength meets the design requirements, avoiding or reducing interlayer shear displacement caused by insufficient interlayer shear strength, asphalt layer displacement, bulging, cracking and sliding and other diseases. The method is simple to operate and has strong applicability, and can be promoted and applied in highway and urban road pavements. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A schematic flow chart of a concrete slab roughening treatment design method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] Example:

[0039] Please refer to Figure 1 In an embodiment of the present application, a method for designing a roughening treatment of a concrete slab is provided, comprising the following steps:

[0040] S1, propose a method for roughening the concrete slab;

[0041] S2, formulate design parameters for different roughening treatment methods;

[0042] S3, calculation of the concrete slab area roughening coefficient μ S ;

[0043] S4, propose the type and amount of waterproof bonding layer Q n ;

[0044] S5, calculate the design value of interlayer shear strength τ s ;

[0045] S6, determine whether the design value of the interlayer shear strength is greater than or equal to the minimum value of the interlayer shear strength: if the design value of the interlayer shear strength is greater than or equal to the minimum value of the interlayer shear strength, the design of the concrete slab roughening treatment is completed; if the design value of the interlayer shear strength is less than the minimum value of the interlayer shear strength, repeat the operations in S2 to S5 until the requirement that the design value of the interlayer shear strength is greater than or equal to the minimum value of the interlayer shear strength is met.

[0046] In this embodiment, in step S1, it is determined that the roughening treatment method of the concrete slab layer is roughening. The design parameters of different roughening treatment methods are shown in the following table:

[0047]

[0048] In this embodiment, in step S3, the concrete slab area roughening coefficient μ is calculated. S for:

[0049]

[0050] In step S4, the proposed waterproof bonding layer type is SBS modified asphalt, and the waterproof bonding layer dosage is Q n 1.9kg / m 2 .

[0051] In step S5, the waterproof bonding layer type coefficient γ m Take the value as 0.45 and calculate the design value of interlayer shear strength τ s for:

[0052]

[0053] In step S6, the minimum interlaminar shear strength τ min is 0.66, then:

[0054] τ s =0.67≥τ min =0.66;

[0055] Therefore, the design value of the interlaminar shear strength of the embodiment meets the requirements.

[0056] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A concrete slab roughening treatment design method for a rigid-flexible composite long-life pavement, characterized in that: The following steps are involved: S1, propose a method for roughening the concrete slab; S2, formulate design parameters for different roughening treatment methods; S3, calculation of the concrete slab area roughening coefficient μ S ; S4, propose the type and amount of waterproof bonding layer Q n ; S5, calculate the design value of interlayer shear strength τ s ; S6, determining whether the design value of the interlayer shear strength is greater than or equal to the minimum value of the interlayer shear strength: if the design value of the interlayer shear strength is greater than or equal to the minimum value of the interlayer shear strength, the design of the concrete slab roughening treatment is completed; If the design value of the interlayer shear strength is less than the minimum value of the interlayer shear strength, the operations in S2 to S5 are repeated until the requirement that the design value of the interlayer shear strength is greater than or equal to the minimum value of the interlayer shear strength is met.

2. The method for designing a roughening treatment of a concrete slab according to claim 1, characterized in that: In step S1, the concrete slab layer is roughened by roughening, shot blasting and milling.

3. The method for designing a roughening treatment of a concrete slab according to claim 1, characterized in that: In step S2, when the roughening treatment method is roughening, the design parameters include the average roughening depth and average roughening spacing When the roughening treatment method is shot blasting, the design parameters include the average shot blasting depth and shot blasting flow rate Q2; when the roughening treatment method is milling, the design parameters include the average milling depth and average milling texture spacing 4. The method for designing a roughening treatment of a concrete slab according to claim 3, characterized in that: Average roughening depth The value range is 0.4~4mm, and the average roughening distance The value range is 15 to 20 mm; the average shot blasting depth The value range of Q2 is 0.5~1.5mm, and the value range of shot blasting flow rate Q2 is 1000~2500g / m 2 ; Average milling depth The value range is 1 to 5 mm, the average milling texture spacing The value range is 30~50mm.

5. The method for designing a roughening treatment of a concrete slab according to claim 1, characterized in that: In step S3, the concrete slab area roughening coefficient μ S The calculation method is: When the roughening treatment method is roughening, the concrete slab area roughening coefficient μ S The calculation formula is: Where: is the average roughening depth, is the average roughening spacing; When the roughening treatment method is shot blasting, the concrete slab area roughening coefficient μ S The calculation formula is: Where: Q2 is the shot ejection flow rate; ρ2 = 7.85 g / cm 3 ; is the average shot blasting depth; When the roughening treatment method is milling, the concrete slab area roughening coefficient μ S The calculation formula is: Where: is the average milling depth; is the average milling texture spacing.

6. The method for designing a roughening treatment of a concrete slab according to claim 1, characterized in that: In step S4, the types of waterproof bonding layers include ordinary asphalt, SBS modified asphalt, and rubber asphalt.

7. The method for designing a roughening treatment of a concrete slab according to claim 6, characterized in that: The dosage of different waterproof bonding layer types under different roughening treatment methods is: When the waterproof bonding layer type is ordinary asphalt: When the roughening treatment method is roughening, the amount of waterproof bonding layer Q n 0.8~1kg / m 2 ; When the roughening treatment method is shot blasting, the amount of waterproof bonding layer Q n 1~1.2kg / m 2 When the roughening treatment method is milling, the amount of waterproof bonding layer Q n 1.2~1.4kg / m 2 ; When the waterproof bonding layer type is SBS modified asphalt: When the roughening treatment method is roughening, the amount of waterproof bonding layer Q n 1.8~2.0kg / m 2 ; When the roughening treatment method is shot blasting, the amount of waterproof bonding layer Q n 2.0~2.2kg / m 2 When the roughening treatment method is milling, the amount of waterproof bonding layer Q n 2.2~2.4kg / m 2 ; When the waterproof bonding layer type is rubber asphalt: When the roughening treatment method is roughening, the amount of waterproof bonding layer Q n 2.0~2.2kg / m 2 ; When the roughening treatment method is shot blasting, the amount of waterproof bonding layer Q n 2.2~2.4kg / m 2 When the roughening treatment method is milling, the amount of waterproof bonding layer Q n 2.2~2.6kg / m 2 .

8. The method for designing a roughening treatment of a concrete slab according to claim 1, characterized in that: In step S5, the interlaminar shear strength design value τ is calculated according to the following formula: s : Where: γ m is the waterproof bonding layer type coefficient; Q n is the amount of waterproof adhesive layer; μ S is the area roughening coefficient of the concrete slab; Among them, γ m The value range of is: When the waterproof bonding layer type is ordinary asphalt, γ m The value range of γ is 0.6~0.7; when the waterproof bonding layer type is SBS modified asphalt, m The value range of γ is 0.4~0.5; when the waterproof bonding layer type is rubber asphalt, m The value range is 0.5~0.

6.

9. The method for designing a roughening treatment of a concrete slab according to claim 1, characterized in that: In step S6, the interlaminar shear strength design value τ s and the minimum interlaminar shear strength τ min The design of concrete slab roughening treatment is completed when the following requirements are met: t s ≥τ min ; Among them, τ min The value range of is: When the waterproof bonding layer type is ordinary asphalt: When the roughening treatment method is roughening, the minimum shear strength between layers τ min is 0.51; when the roughening treatment method is shot blasting, the minimum interlayer shear strength τ min is 0.63; when the roughening treatment method is milling, the minimum interlayer shear strength τ min is 0.81; When the waterproof bonding layer type is SBS modified asphalt: When the roughening treatment method is roughening, the minimum shear strength between layers τ min is 0.66; when the roughening treatment method is shot blasting, the minimum interlayer shear strength τ min is 0.85; when the roughening treatment method is milling, the minimum interlayer shear strength τ min is 1.09; When the waterproof bonding layer type is rubber asphalt: When the roughening treatment method is roughening, the minimum shear strength between layers τ min is 0.93; when the roughening treatment method is shot blasting, the minimum interlayer shear strength τ min is 1.12; when the roughening treatment method is milling, the minimum interlayer shear strength τ min is 1.34.

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