Single-component polyurethane mix cement concrete bridge deck pavement method

Abstract

The application belongs to the technical field of road engineering, and particularly discloses a single-component polyurethane mixture cement concrete bridge deck paving method, which comprises the following steps: S1, treating the top surface of the cement concrete paving layer; S2, spraying a certain amount of modified emulsified asphalt; S3, constructing an SBS modified asphalt macadam seal coat, wherein the spreading amount of the SBS modified asphalt is 0.8-1.0 kg / m 2 ; the macadam has two grades with particle sizes of 5-10 mm and 10-15 mm, and the spreading amount needs to ensure that the coverage rate of the macadam is between 60-70%; S4, using a rubber-tired road roller to roll the macadam for two times; S5, constructing polyurethane mortar, and the construction thickness is 1.5-2.5 cm; S6, spreading single-component polyurethane, and the spreading amount is 1.0-1.2 kg / m 2 ; and S7, constructing a polyurethane mixture paving layer, and selecting the gradation type and the number of paving layers according to the functional requirements of the bridge deck paving layer. The application can meet various requirements such as heavy load, high temperature, drainage and noise reduction, and realizes the coupling of the anti-rutting and multifunctional requirements of the cement concrete bridge deck paving layer.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of road engineering, and particularly relates to a method for cement concrete bridge deck pavement of single-component polyurethane mixture. BACKGROUND

[0002] The diseases of the cement concrete bridge deck pavement layer, especially the diseases of the asphalt mixture pavement, have been a difficult problem for road workers all the time, and also cause frequent maintenance of the cement concrete bridge deck pavement layer, affect the traffic efficiency and safety, and consume a large amount of maintenance funds. The diseases of the cement concrete bridge deck pavement mainly include water damage and rut, and therefore, in the previous cement concrete bridge deck pavement, the problems of waterproofing and rut resistance are mainly solved. However, it is difficult to simultaneously solve the two problems of waterproofing and rut resistance by using the traditional asphalt mixture and structure.

[0003] In order to solve the problems of rut resistance and waterproofing, the road workers simultaneously optimize and design the bridge deck pavement structure and asphalt, adopt a multi-layer asphalt mixture composite structure, or high modulus, hard asphalt and other special modified asphalt to improve the rut resistance of the asphalt mixture, but the binder is still asphalt, and the rheological deformation under the coupling condition of high temperature and heavy load still exists, and high-temperature rut is prone to occur.

[0004] Therefore, a new material and structure combination is needed to replace the existing asphalt mixture bridge deck pavement to solve the problems of water storage between layers and rut in the bridge deck pavement, comprehensively improve the durability and service life of the cement concrete bridge deck pavement structure, reduce the maintenance cost, and the influence of maintenance and repair activities on driving and safety. SUMMARY

[0005] The application aims to provide a method for cement concrete bridge deck pavement of single-component polyurethane mixture, which effectively solves the problems of water storage between layers and rut in the existing asphalt mixture bridge deck pavement.

[0006] To solve the above technical problems, the technical scheme adopted by the application is as follows:

[0007] A method for cement concrete bridge deck pavement of single-component polyurethane mixture, comprising the following steps:

[0008] S1, treating the top surface of the cement concrete pavement layer, and the exposed stone rate of the cement concrete bridge deck pavement after treatment is not less than 40%, and the surface texture depth is 0.8-1.2;

[0009] S2, after the treatment of the cement concrete bridge deck pavement, spraying a certain amount of modified emulsified asphalt, and the asphalt content in the modified emulsified asphalt is not less than 60%;

[0010] S3, construction of SBS modified asphalt chip seal, the SBS modified asphalt spreading amount is 0.8-1.0kg / m 2 .

[0011] The said chip stone is of two grades of 5-10mm and 10-15mm, the two grades of chip stone are mixed according to a certain ratio, and after pre-mixing by adding 0.3% base asphalt, the spreading amount needs to ensure that the coverage rate of chip stone is between 60-70%;

[0012] S4, using rubber wheel roller to roll twice;

[0013] S5, construction of polyurethane mortar, construction thickness is 1.5-2.5cm, and hanging line construction is used to ensure construction thickness and flatness;

[0014] S6, spreading of single-component polyurethane, spreading amount is 1.0-1.2kg / m 2 .

[0015] S7, construction of polyurethane mixture paving layer, the gradation type and the number of paving layers are selected according to the functional requirements of the bridge deck pavement;

[0016] When the bridge deck pavement has heavy load anti-rutting or high temperature anti-rutting requirements, one layer of discontinuous gradation polyurethane mixture is used, the nominal maximum particle size is not more than 16mm, and the construction thickness is 6-8cm;

[0017] When the bridge deck pavement has drainage and noise reduction requirements, two layers are designed, the lower layer is dense gradation polyurethane mixture, the nominal maximum particle size is not more than 13.2mm, and the construction thickness is 3-4cm, and the upper layer is multi-void gradation polyurethane mixture, the nominal maximum particle size is not more than 13.2mm, and the construction thickness is 3-4cm;

[0018] When the bridge deck pavement has no special functional requirements, one layer of dense gradation polyurethane mixture is used, the nominal maximum particle size is not more than 16mm, and the construction thickness is 4-6cm.

[0019] Further, in step S1, the treatment methods include but are not limited to manual chiseling, shot blasting, and precision milling.

[0020] Further, in step S2, the spreading amount of the modified emulsified asphalt is 0.6-0.8kg / m 2 .

[0021] Further, in step S3, the chip stone is basalt, and the two grades of chip stone are mixed according to the ratio of 5-10mm particle size:10-15mm particle size=60:40.

[0022] Further, in step S5, the polyurethane mortar uses basalt as aggregate, and the aggregate gradation range of the polyurethane mortar is: 4.5mm, 90%-100%; 2.36mm, 72%-90%; 1.18mm, 50%-70%; 0.6mm, 30%-50%; 0.3mm, 20%-35%; 0.15mm, 10%-20%; 0.075mm, 0-8%.

[0023] Further, in step S7, the polyurethane mixture uses basalt as aggregate.

[0024] The beneficial technical effects of the present application are:

[0025] (1) The polyurethane has no rheological or phase transition at high temperature, can resist the deformation of the bridge deck pavement layer caused by heavy traffic under high temperature conditions, reduce the occurrence of bridge deck pavement rutting diseases, save maintenance funds, and reduce the impact of maintenance activities on traffic.

[0026] (2) The polyurethane mixture can be mixed and constructed at low temperature, the workability and construction window period at low temperature can be extended, and the performance of the formed pavement structure is not affected, which has better low-temperature adaptability and construction workability, and can solve the problems of poor quality and low durability of the pavement layer after construction at low temperature.

[0027] (3) The bridge deck pavement layer can be customized according to the functional requirements of the bridge surface, to meet the requirements of heavy load, high temperature, drainage and noise reduction, and realize the coupling of anti-rutting and multi-functional requirements of the cement concrete bridge deck pavement layer. DETAILED DESCRIPTION

[0028] A single-component polyurethane mixture cement concrete bridge deck pavement method, comprising the following steps:

[0029] S1, after the construction of the cement concrete bridge deck pavement layer, the top surface of the cement concrete pavement layer is treated to ensure sufficient exposed aggregate rate and structure depth, and the treatment methods include but are not limited to manual chiseling, shot blasting, precision milling, etc. After treatment, the exposed aggregate rate of the cement concrete bridge deck pavement is not less than 40%, and the surface structure depth is 0.8-1.2.

[0030] S2, after the treatment of the cement concrete bridge deck pavement, a modified emulsified asphalt primer is sprayed to increase the adhesion between the waterproof layer and the cement concrete bridge deck pavement, and the spreading amount of the modified emulsified asphalt is 0.6-0.8kg / m 2 , and the asphalt content in the modified emulsified asphalt is not less than 60%.

[0031] S3, after spraying modified emulsified asphalt primer, construction SBS modified asphalt macadam seal coat. The SBS modified asphalt spreading amount is 0.8-1.0 kg / m 2 ; the macadam is basalt, the macadam uses two grades of particle size of 5-10 mm and 10-15 mm, the two grades of macadam are mixed according to the ratio of 5-10 mm particle size: 10-15 mm particle size = 60:40, and are spread after pre-mixing by mixing and dust removal, adding 0.3% of base asphalt, and the spreading amount needs to ensure that the coverage rate of the macadam is between 60-70%.

[0032] S4, using a rubber wheel roller to roll for two times.

[0033] S5, construction of polyurethane mortar as waterproof and leveling layer, the aggregate gradation range in the polyurethane mortar is: 4.5 mm, 90%-100%; 2.36 mm, 72%-90%; 1.18 mm, 50%-70%; 0.6 mm, 30%-50%; 0.3 mm, 20%-35%; 0.15 mm, 10%-20%; 0.075 mm, 0-8%. The polyurethane mortar uses basalt aggregate, the construction thickness is 1.5-2.5 cm, and the hanging line construction is used to ensure the construction thickness and flatness during construction.

[0034] S6, spreading single-component polyurethane as a bonding layer, the spreading amount is 1.0-1.2 kg / m 2 .

[0035] S7, construction of polyurethane mixture paving layer, the gradation type and the number of paving layers are selected according to the functional requirements of the bridge deck pavement layer;

[0036] When the bridge deck pavement layer has heavy load anti-rutting or high temperature anti-rutting requirements, one layer of discontinuous gradation polyurethane mixture is used, the nominal maximum particle size is not more than 16 mm, and the construction thickness is 6-8 cm;

[0037] When the bridge deck pavement layer has drainage and noise reduction requirements, two layers are designed, the lower layer is dense gradation polyurethane mixture, the nominal maximum particle size is not more than 13.2 mm, and the construction thickness is 3-4 cm, and the upper layer is multi-void gradation polyurethane mixture, the nominal maximum particle size is not more than 13.2 mm, and the construction thickness is 3-4 cm;

[0038] When the bridge deck pavement layer has no special functional requirements, one layer of dense gradation polyurethane mixture is used, the nominal maximum particle size is not more than 16 mm, and the construction thickness is 4-6 cm.

[0039] The application will be further described in detail in combination with examples.

[0040] Example

[0041] A single-component polyurethane mixture cement concrete bridge deck paving method with the abilities of anti-rutting, drainage and noise reduction is taken as an example, which comprises the following steps:

[0042] S1, after the construction of the cement concrete bridge deck paving layer, the cement concrete bridge deck paving is treated by manual chiseling, shot blasting, precision milling and other ways, and the bone exposure rate of the treated cement concrete bridge deck paving is not less than 40%, and the surface texture depth is 0.8-1.2.

[0043] S2, after the treatment of the cement concrete bridge deck paving, modified emulsified asphalt primer with asphalt content not less than 60% is sprayed, and the spreading amount is 0.7kg / m 2 .

[0044] S3, after the spraying of the modified emulsified asphalt primer, SBS modified asphalt macadam seal coat is constructed.

[0045] The spreading amount of the SBS modified asphalt is 1.0kg / m 2 .

[0046] The macadam is basalt, two grades of basalt aggregate with particle sizes of 5-10mm and 10-15mm are loaded according to the ratio of 60:40, heated and dedusted through a mixing station, and 0.3% of base asphalt is added and premixed, then spread by a macadam seal coat spreader, the spreading amount of the macadam is 7.5kg / m 2 , the coverage rate of the macadam is between 60-70%, and after the spreading of the macadam seal coat, a rubber-tired road roller is used for full-width rolling for two times.

[0047] S4, after the completion of the macadam seal coat, polyurethane mortar is constructed as a waterproof and leveling layer, the polyurethane mortar uses basalt aggregate, and the construction thickness needs to be between 1.5-2.5cm, and during the construction, wire hanging construction should be used to ensure the construction thickness and flatness.

[0048] The aggregate gradation in the polyurethane mortar is: 4.5mm, 96%; 2.36mm, 78%; 1.18mm, 60%; 0.6mm, 37%; 0.3mm, 25%; 0.15mm, 14%; 0.075mm, 6%.

[0049] S5, after the completion of the polyurethane mortar construction, single-component polyurethane is spread as a tack coat, and the spreading amount is 1.0-1.2kg / m 2 .

[0050] S6, the polyurethane mixture paving layer is constructed by using two-layer design.

[0051] The lower layer should be a dense gradation structure, the design thickness is 4cm, the nominal maximum particle size is 13mm, and the aggregate gradation is: 16mm, 100%; 13.2mm, 94%; 9.5mm, 76%; 4.5mm, 46%; 2.36mm, 35%; 1.18mm, 22%; 0.6mm, 16%; 0.3mm, 11%; 0.15mm, 9%; 5.5mm, 6%.

[0052] The upper layer is a multi-void gradation polyurethane mixture, the nominal maximum particle size is not more than 13.2mm, the construction thickness is 3cm, and the aggregate gradation is: 16mm, 100%; 13.2mm, 93%; 9.5mm, 74%; 4.5mm, 23%; 2.36mm, 15%; 1.18mm, 11%; 0.6mm, 9%; 0.3mm, 7%; 0.15mm, 4%; 0.075mm, 3%.

[0053] Compared with the traditional asphalt mixture bridge deck, the polyurethane has no rheological or phase transition at high temperature, can resist the deformation of the bridge deck pavement layer caused by heavy traffic under high temperature conditions, reduce the occurrence of bridge deck pavement rutting diseases, save maintenance funds, and reduce the impact of maintenance activities on traffic. Second, the polyurethane mixture can be mixed and constructed at low temperature, the workability and construction window period can be extended at low temperature, the performance of the formed pavement structure is not affected, has better low temperature adaptability and construction workability, and can solve the problems that the bridge deck pavement cannot be constructed at low temperature or the quality of the pavement layer after construction is poor and the durability is low. Third, the bridge deck pavement layer can be customized according to the functional requirements of the bridge deck, to meet the requirements of heavy load, high temperature, drainage and noise reduction, and realize the coupling of the anti-rutting and multi-functional requirements of the cement concrete bridge deck pavement layer.

[0054] Of course, the above description is not a limitation of the present application, and the present application is not limited to the above examples, and the changes, modifications, additions or replacements made by the person skilled in the art within the essential scope of the present application should also belong to the protection scope of the present application.

Claims

1. A method for paving a bridge deck with a single-component polyurethane mixture cement concrete, characterized in that, Includes the following steps: S1. Treat the top surface of the cement concrete pavement layer. After treatment, the exposed aggregate rate of the cement concrete bridge deck pavement shall not be less than 40%, and the surface texture depth shall be 0.8 to 1.

2. Treatment methods include manual roughening, shot blasting, and precision milling. S2. After the cement concrete bridge deck pavement is treated, a certain amount of modified emulsified asphalt is sprayed on it, wherein the asphalt content in the modified emulsified asphalt is not less than 60%. S3. Apply SBS modified asphalt chip seal layer, with an SBS modified asphalt application rate of 0.8–1.0 kg / m³. 2 ; The crushed stone is divided into two grades with a particle size of 5-10mm and 10-15mm. The two grades of crushed stone are mixed in a certain proportion, and after mixing and dust removal, 0.3% of base asphalt is added for premixing and then spread. The spreading amount needs to ensure that the coverage of crushed stone is between 60% and 70%. S4. Compact the entire width twice using a rubber-tired roller. S5. Apply polyurethane mortar with a thickness of 1.5-2.5cm. Use a plumb line during application to ensure the thickness and flatness of the mortar. S6. Apply single-component polyurethane at a rate of 1.0–1.2 kg / m³. 2 ; S7. Construct polyurethane mixture pavement layer, and select the gradation type and number of pavement layers according to the functional requirements of the bridge deck pavement layer. When the bridge deck pavement layer has heavy load resistance or high temperature resistance to rutting, a layer of discontinuous graded polyurethane mixture is used, with a nominal maximum particle size of 16mm and a construction thickness of 6-8cm. When the bridge deck pavement layer has drainage and noise reduction requirements, a two-layer design is adopted. The lower layer is a dense-graded polyurethane mixture with a nominal maximum particle size of 13.2mm and a construction thickness of 3-4cm. The upper layer is a porous-graded polyurethane mixture with a nominal maximum particle size of 13.2mm and a construction thickness of 3-4cm. When the bridge deck pavement layer has no special functional requirements, a single layer of dense-graded polyurethane mixture is used, with a nominal maximum particle size of 16mm and a construction thickness of 4-6cm.

2. The method for paving a single-component polyurethane mixture cement concrete bridge deck according to claim 1, characterized in that, In step S2, the application rate of the modified emulsified asphalt is 0.6–0.8 kg / m³. 2 .

3. The method for paving a single-component polyurethane mixture cement concrete bridge deck according to claim 2, characterized in that, In step S3, the crushed stone is basalt, and the two grades of crushed stone are mixed in a ratio of 5-10mm particle size: 10-15mm particle size = 60:

40.

4. The method for paving a single-component polyurethane mixture cement concrete bridge deck according to claim 3, characterized in that, In step S5, the polyurethane mortar uses basalt as aggregate, and the aggregate gradation range in the polyurethane mortar is: 4.5mm, 90%~100%; 2.36mm, 72%~90%; 1.18mm, 50%~70%; 0.6mm, 30%~50%; 0.3mm, 20%~35%; 0.15mm, 10%~20%; 0.075mm, 0~8%.

5. The method for paving a single-component polyurethane mixture cement concrete bridge deck according to claim 4, characterized in that, In step S7, basalt is used as aggregate in the polyurethane mixture.