A design method for roughening treatment of concrete slabs

Abstract

This application provides a design method for roughening treatment of concrete slabs, which includes: determining the roughening treatment method for the concrete slab layer; determining the design parameters for different roughening treatment methods; and calculating the area roughening coefficient μ of the concrete slab. S ; Determine the type and amount of waterproof adhesive layer Q n ; Calculate the design value τ of inter-story shear strength s The process involves determining whether the design value of the interlayer shear strength is greater than or equal to the minimum interlayer shear strength. If the design value is greater than or equal to the minimum interlayer shear strength, the roughening design of the concrete slab is completed. If the design value is less than the minimum interlayer shear strength, the above steps are repeated until the requirement that the design value is greater than or equal to the minimum interlayer shear strength is met. This method allows for precise control of the roughening treatment quality of concrete slabs in rigid-flexible composite long-life pavements before construction, thereby ensuring that the interlayer shear strength meets design requirements and avoiding defects such as interlayer shear displacement, asphalt layer shoving, and shoving.

Description

Technical Field

[0001] This application relates to the field of road construction, and in particular to a design method for roughening concrete slabs. Background Technology

[0002] With the rapid development of road construction in my country, rigid-flexible composite long-life pavements have been widely used nationwide due to their superior performance. However, the interlayer bonding is a weak point in rigid-flexible composite pavements. In composite pavement structures, the strength between the cement concrete layer and the asphalt layer mainly relies on the friction between the asphalt layer and the cement concrete layer surface, as well as the bonding force of the interlayer binder, to resist shear stress. Meanwhile, the strength within the ordinary asphalt layer mainly comes from the interlocking effect of aggregates. Therefore, the shear resistance of the interlayer is relatively weak, and interlayer shear displacement is prone to occur. In severe cases, it can lead to diseases such as shoving, shoving, cracking, and slippage in the asphalt layer, resulting in the destruction of the asphalt layer's function. This necessitates that the asphalt layer and the cement concrete layer must have good interlayer shear strength.

[0003] Typically, an interlayer binder, such as a waterproof bonding layer, is used between the asphalt layer and the cement concrete layer to improve the interlayer shear strength through bonding and interlocking. Roughening the concrete layer can effectively enhance the interlocking effect between the interlayer binder and the cement concrete layer.

[0004] Currently, roughening treatments include roughening, shot blasting, and milling. However, the quality of these roughening treatments is closely related to the skill level of the construction equipment and personnel, making it difficult to precisely control the quality of the roughening treatment. Summary of the Invention

[0005] This application provides a design method for roughening treatment of concrete slabs, which is applicable to the design of rigid-flexible composite long-life pavements. It aims to accurately control the quality of roughening treatment of concrete layers in rigid-flexible composite long-life pavements, thereby ensuring interlayer shear strength and reducing asphalt layer defects.

[0006] The technical solution of this application is:

[0007] A method for roughening concrete slabs, applicable to rigid-flexible composite long-life pavement design, includes the following steps:

[0008] S1, Propose a method for roughening concrete slabs;

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

[0010] S3, Calculate the area roughness coefficient μ of the concrete slab. S ;

[0011] S4, Determine the type and amount of waterproof adhesive layer Q n ;

[0012] S5, Calculate the design value of inter-story shear strength τ s ;

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

[0014] As one technical solution of this application, in step S1, the roughening treatment of the concrete slab includes roughening, shot blasting and milling.

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

[0016]

[0017] As a technical solution of this application, in step S3, the surface roughness coefficient μ of the concrete slab is... S The degree of roughening of concrete slabs is characterized by calculations based on the table below for different roughening treatments:

[0018]

[0019] In the formula: The average roughening depth, ρ2 represents the average roughening spacing; Q2 represents the steel shot blasting flow rate; ρ2 = 7.85 g / cm³ 3 ; This represents the average shot blasting depth. This represents the average milling depth. This represents the average milling texture spacing.

[0020] As one technical solution of this application, in step S4, the waterproof bonding layer types include ordinary asphalt, SBS modified asphalt, and rubber asphalt; the dosage of different waterproof bonding layer types under different roughening treatment methods is shown in the table below:

[0021]

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

[0023]

[0024] In the formula: γ m Q is the coefficient for the type of waterproof adhesive layer.n The amount of waterproof adhesive layer used; μ S The area roughening coefficient of the concrete slab;

[0025] Where, γ m The range of values ​​for is shown in the table below:

[0026]

[0027] As a technical solution of this application, in step S6, the interlaminar shear strength design value τ s Minimum interlaminar shear strength τ min The concrete slab roughening treatment design is considered complete when the following requirements are met:

[0028] τ s ≥τ min ;

[0029] Where, τ min The range of values ​​for is shown in the table below:

[0030]

[0031] The beneficial effects of this application are:

[0032] This application provides a design method for roughening concrete slabs, which can precisely control the quality of roughening treatment of concrete slabs in rigid-flexible composite long-life pavements before construction. This ensures that the interlayer shear strength meets design requirements and avoids or reduces interlayer shear displacement, asphalt layer shoving, shoving, cracking, and slippage caused by insufficient interlayer shear strength. This method is simple to operate, has strong applicability, and can be widely applied to highway and urban road pavements. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the concrete slab roughening treatment design method provided in the embodiments of this application. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] Example:

[0039] Please refer to Figure 1 This application provides a method for designing a roughening treatment for a concrete slab, comprising the following steps:

[0040] S1, Propose a method for roughening concrete slabs;

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

[0042] S3, Calculate the area roughness coefficient μ of the concrete slab. S ;

[0043] S4, Determine the type and amount of waterproof adhesive layer Q n ;

[0044] S5, Calculate the design value of inter-story shear strength τ s ;

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

[0046] In this embodiment, in step S1, the roughening treatment method for the concrete slab is determined to be roughening. The design parameters for different roughening treatment methods are shown in the table below:

[0047]

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

[0049]

[0050] In step S4, the proposed type of waterproof adhesive layer is SBS modified bitumen, and the amount of waterproof adhesive layer Q is determined. n It is 1.9 kg / m 2 .

[0051] In step S5, the waterproof adhesive layer type coefficient γ m The value is set to 0.45, and the design value of inter-story shear strength τ is calculated. s for:

[0052]

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

[0054] τ s =0.67≥τ min =0.66;

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

[0056] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for roughening concrete slabs, used in rigid-flexible composite long-life pavements, characterized in that, Includes the following steps: S1, Propose a method for roughening concrete slabs; S2, determine the design parameters for different roughening treatment methods; S3, Calculate the area roughness coefficient μ of the concrete slab. S ; concrete slab area roughness coefficient μ S The calculation method is as follows: When the roughening treatment method is roughening, the area roughening coefficient μ of the concrete slab S The calculation formula is: ； In the formula: The average roughening depth, This represents the average spacing between the roughened areas. When the roughening treatment method is shot blasting, the area roughening coefficient μ of the concrete slab is... S The calculation formula is: ； In the formula: Q2 is the steel shot blasting flow rate; ρ2 = 7.85 g / cm³ 3 ; The average shot blasting depth; When the roughening treatment method is milling, the surface roughening coefficient μ of the concrete slab is... S The calculation formula is: ； In the formula: This represents the average milling depth. This represents the average milling texture spacing; S4, Determine the type and amount of waterproof adhesive layer Q n ; S5, Calculate the design value of inter-story shear strength τ s ; S6, determine whether the design value of inter-layer shear strength is greater than or equal to the minimum value of inter-layer shear strength: if the design value of inter-layer shear strength is greater than or equal to the minimum value of inter-layer shear strength, then the design of roughening treatment for concrete slab is completed; If the design value of inter-story shear strength is less than the minimum value of inter-story shear strength, repeat the operations in S2 to S5 until the requirement that the design value of inter-story shear strength is greater than or equal to the minimum value of inter-story shear strength is met.

2. The concrete slab roughening treatment design method according to claim 1, characterized in that, In step S1, the roughening treatment of the concrete slab includes roughening, shot blasting, and milling.

3. The concrete slab roughening treatment design method 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 the 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 concrete slab roughening treatment design method according to claim 3, characterized in that, Average roughening depth The value ranges from 0.4 to 4 mm, and the average roughening spacing is... The value range is 15–20 mm; average shot blasting depth The value range is 0.5–1.5 mm, and the value range of steel shot blasting flow rate Q2 is 1000–2500 g / m³. 2 Average milling depth The value range is 1~5 mm, and the average milling texture spacing is... The value range is 30~50 mm.

5. The concrete slab roughening treatment design method according to claim 1, characterized in that, In step S4, the waterproof bonding layer types include ordinary asphalt, SBS modified asphalt, and rubber asphalt.

6. The concrete slab roughening treatment design method according to claim 5, characterized in that, The dosage of different waterproof adhesive layer types under different roughening treatment methods is as follows: When the waterproof bonding layer type is ordinary asphalt: When the roughening treatment method is roughening, the amount of waterproof bonding layer Q is... n It is 0.8~1 kg / m 2 When the roughening treatment is shot blasting, the amount of waterproof adhesive layer Q is... n It is 1~1.2 kg / m 2 When the roughening treatment method is milling, the amount of waterproof adhesive layer Q is... n It is 1.2~1.4 kg / m 2 ; When the waterproof bonding layer type is SBS modified bitumen: When the roughening treatment method is roughening, the amount of waterproof bonding layer Q is... n It is 1.8~2.0 kg / m 2 When the roughening treatment is shot blasting, the amount of waterproof adhesive layer Q is... n It is 2.0~2.2 kg / m 2 When the roughening treatment method is milling, the amount of waterproof adhesive layer Q is... n It is 2.2~2.4 kg / m 2 ; When the waterproof adhesive layer type is rubber asphalt: When the roughening treatment method is roughening, the amount of waterproof adhesive layer Q is... n It is 2.0~2.2 kg / m 2 When the roughening treatment is shot blasting, the amount of waterproof adhesive layer Q is... n It is 2.2~2.4 kg / m 2 When the roughening treatment method is milling, the amount of waterproof adhesive layer Q is... n It is 2.2~2.6 kg / m 2 .

7. The concrete slab roughening treatment design method according to claim 1, characterized in that, In step S5, the design value τ of the inter-layer shear strength is calculated according to the following formula. s : ； In the formula: Q is the coefficient for the type of waterproof adhesive layer. n The amount of waterproof adhesive layer used; μ S The area roughening coefficient of the concrete slab; in, The range of values ​​for is: When the waterproof bonding layer is ordinary asphalt The value range is 0.6~0.7; when the waterproof bonding layer type is SBS modified bitumen, The value range is 0.4~0.5; when the waterproof bonding layer type is rubber asphalt, The value range is 0.5 to 0.

6.

8. The concrete slab roughening treatment design method according to claim 1, characterized in that, In step S6, the interlaminar shear strength design value τ s Minimum interlaminar shear strength τ min The concrete slab roughening treatment design is considered complete when the following requirements are met: t s ≥τ min ; Where, τ min The range of values ​​for is: When the waterproof bonding layer is ordinary asphalt: When the roughening treatment method is roughening, the minimum interlayer shear strength τ min The minimum interlaminar shear strength τ is 0.51 when the roughening treatment is shot blasting. min The minimum interlayer shear strength τ is 0.63 when the roughening method is milling. min It is 0.81; When the waterproof bonding layer is SBS modified bitumen: the minimum interlayer shear strength τ is when the roughening treatment method is roughening. min The minimum interlaminar shear strength τ is 0.66 when the roughening treatment is shot blasting. min The minimum interlayer shear strength τ is 0.85 when the roughening method is milling. min It is 1.09; When the waterproof bonding layer type is rubber asphalt: When the roughening treatment method is roughening, the minimum interlayer shear strength τ min The minimum interlaminar shear strength τ is 0.93 when the roughening treatment is shot blasting. min The minimum interlayer shear strength τ is 1.12 when the roughening method is milling. min It is 1.34.

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