Pavement structure
By employing a multi-layer design of water-reactive cold-mix asphalt mixture and cement mortar filling in the pavement structure, the construction difficulties of semi-flexible pavement under special weather conditions have been solved, the stability and service life of the pavement structure have been improved, and the occurrence of defects has been reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2026-03-27
AI Technical Summary
Existing semi-flexible pavements are prone to shear shoving or rutting in sections with frequent vehicle starts and stops and severe channelized traffic. Furthermore, they cannot be constructed in rainy weather or during cold seasons, affecting driving safety and pavement quality.
The upper and lower layers are laid out layer by layer from top to bottom, and water-reactive cold-mix asphalt mixture and cement mortar are used to fill them, forming a pavement structure that combines flexibility and rigidity. The upper and lower layers are connected by an adhesive layer to ensure that construction can be carried out at room temperature.
The construction process achieved zero carbon emissions, reduced construction restrictions during rainy weather and low-temperature seasons, improved the stability and service life of the road structure, and reduced the frequency of maintenance and repairs.
Smart Images
Figure CN224047836U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the road construction technical field, and particularly relates to a pavement structure. BACKGROUND
[0002] The poured semi-flexible pavement refers to a pavement formed by pouring special cement mortar into base asphalt mixture. It has rigidity of cement concrete pavement and flexibility of asphalt concrete pavement. The semi-flexible pavement material forms material strength through mutual embedding and extruding of aggregates and cement stone, improves the ability of resisting load action, and is much better than ordinary asphalt concrete pavement in high-temperature stability (anti-deformation and anti-shear performance), water damage resistance, fatigue resistance and skid resistance. Meanwhile, it has the characteristics of cement concrete pavement such as oil resistance, acid resistance and easy coloring. In addition, the semi-flexible pavement does not need special construction tools for paving large-void base asphalt mixture, and only needs ordinary grouting machinery for pouring cement mortar, so it is convenient to construct and low in cost. Based on the above characteristics, the semi-flexible pavement has become an important treatment measure for improving rutting problems of road sections such as flat intersections and bus stations in recent years.
[0003] However, the large-void base asphalt mixture of the semi-flexible pavement is almost all hot-mixed asphalt mixture at present, and the treatment area of the semi-flexible pavement in common scenes such as flat intersections and bus stations is generally small, so the amount of base asphalt mixture is also small, so that the production quality is often difficult to guarantee, and the hot-mixed asphalt mixture cannot be constructed after the temperature drops in rainy weather or in deep autumn or early winter in cold areas, which leads to that the asphalt pavement cannot be repaired in time after rutting and other diseases occur, and not only endangers driving safety, but also reduces the steering stability and comfort during vehicle driving. CONTENT OF THE UTILITY MODEL
[0004] The present application provides a pavement structure to solve the problem of shear displacement or rutting disease of the asphalt pavement of the road section where vehicles frequently start and stop and the road section with serious channelized traffic in the background art.
[0005] The present application provides a pavement structure, which comprises an upper layer, a bonding layer and a lower layer arranged layer by layer from top to bottom.
[0006] The upper layer is paved by first water-reactive cold-mixed asphalt mixture containing first voids;
[0007] The lower layer is paved by second water-reactive cold-mixed asphalt mixture containing second voids;
[0008] The void ratio of the first voids is less than or equal to the void ratio of the second voids, and the first voids and the second voids are filled with cement mortar.
[0009] The pavement structure provided by the application has the following beneficial effects:
[0010] 1) The water-reactive cold-mixed asphalt used in the application is in a flowing state at normal temperature, and the asphalt and mineral aggregate can be mixed and produced without heating, completely realizing zero carbon emission during the construction process, saving energy and protecting the environment, and enabling rutting disease maintenance and treatment to be performed at any time and anywhere without being affected by rainy weather and low temperature seasons.
[0011] 2) The water-reactive cold-mixed asphalt mixture in the application uses water as an activator to promote the rapid chemical gel solidification reaction of the diluent in the cold-mixed asphalt, so that the cold-mixed asphalt mixture can quickly form strength, solving the shortcomings of slow strength growth and water erosion of traditional cold-mixed asphalt mixtures.
[0012] 3) The poured semi-flexible pavement structure based on the cold-mixed asphalt mixture provided by the application can effectively reduce the rutting and shear displacement diseases of the asphalt pavement, improve the pavement quality, and reduce the number of maintenance and repair times.
[0013] 4) The pavement structure provided by the application can bond and connect the upper layer and the lower layer through the bonding layer, so that the two layers become a whole, reduce the relative sliding between the layers, and be beneficial to improving the stability of the pavement structure. In addition, the multi-layer design can effectively improve the strength and quality of the pavement structure and prolong the service life of the pavement.
[0014] Optionally, the first water-reactive cold-mixed asphalt mixture includes SPAC-13 poured semi-flexible mixture of the water-reactive cold-mixed asphalt mixture.
[0015] The second water-reactive cold-mixed asphalt mixture includes SPAC-20 poured semi-flexible mixture of the water-reactive cold-mixed asphalt mixture.
[0016] Optionally, the bonding layer includes cationic SBR modified emulsified asphalt, SBS modified emulsified asphalt, water-based epoxy resin modified emulsified asphalt, or VAE modified emulsified asphalt.
[0017] Optionally, the thickness of the upper layer is 40-45 mm, and the void ratio of the first void is 25-28%.
[0018] Optionally, the thickness of the lower layer is 60-65 mm, and the void ratio of the second void is 28-30%.
[0019] Optionally, a support layer 4 is arranged below the lower layer 3.
[0020] Optionally, the support layer includes a base layer and a drainage layer from top to bottom.
[0021] The drainage layer is paved with graded gravel with a particle size of 0.075-31.5 mm, and the thickness of the drainage layer is 4-10 cm.
[0022] The base layer is a cement stabilized macadam layer, and the thickness is 50-60 cm;
[0023] The drainage groove is provided on both sides of the base layer symmetrically, and the end of the drainage groove close to the central part of the base layer is higher than the other end;
[0024] The drainage groove is provided with multiple drainage grooves, and the multiple drainage grooves are arranged along the length direction of the base layer.
[0025] Optionally, the deepest part of the drainage groove is 1-2 cm;
[0026] The drainage groove is filled with graded macadam with a particle size of 6-10 mm.
[0027] The pavement structure provided by the application can be applied to the repair of damaged pavement or the paving of newly-built roads. BRIEF DESCRIPTION OF DRAWINGS
[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0029] Figure 1 The structural schematic diagram of the pavement structure provided by an embodiment of the present application;
[0030] Figure 2 The structural schematic diagram of the pavement structure provided by another embodiment of the present application;
[0031] Figure 3 The cross-sectional structural schematic diagram of the base layer provided by an embodiment of the present application;
[0032] Figure 4 The three-dimensional structural schematic diagram of the base layer provided by an embodiment of the present application.
[0033] Explanation of reference signs:
[0034] 1, upper layer; 2, bonding layer; 3, lower layer; 4, support layer; 41, base layer; 42, drainage layer; 411, drainage groove. DETAILED DESCRIPTION
[0035] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are clearly and completely described below. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.
[0036] As shown in Figure 1 The present application provides a pavement structure, comprising an upper layer 1, a bonding layer 2 and a lower layer 3 arranged layer by layer from top to bottom;
[0037] The upper layer 1 is paved with a first water-reactive cold mix asphalt mixture containing first voids;
[0038] The lower layer 3 is paved with a second water-reactive cold mix asphalt mixture containing second voids;
[0039] The void ratio of the first voids is less than or equal to the void ratio of the second voids, and the first voids and the second voids are filled with cement mortar.
[0040] In the present application, the cement mortar is injected into the surface layer paved with the asphalt mixture. Since the asphalt mixture is flexible and the cement mortar is rigid after solidification, the pavement has both the rigidity of the cement concrete pavement and the flexibility of the asphalt concrete pavement. The semi-flexible pavement material improves the ability of the pavement to resist load by the mutual embedding and extruding action of the aggregates and the cement stone, and the high-temperature stability (anti-deformation and anti-shearing performance), water damage resistance of the semi-flexible pavement material are much better than those of the ordinary asphalt concrete pavement, and the fatigue resistance and skid resistance of the semi-flexible pavement material are not inferior to those of the ordinary asphalt concrete pavement. At the same time, the semi-flexible pavement material has the properties of the cement concrete pavement, such as oil resistance, acid resistance and easy coloring.
[0041] The lower layer 3 plays a main supporting role, so its rigidity should be no less than that of the upper layer 1, and therefore the porosity of the lower layer 3 is no less than that of the upper layer 1, so that more cement mortar can be injected into the lower layer 3 to improve its rigidity and strength.
[0042] The pavement structure provided by the present application has the following beneficial effects:
[0043] 1) The water-reactive cold mix asphalt used in the present application is in a flow state at room temperature, and the asphalt and the mineral aggregate can be mixed and produced without heating, which completely realizes zero carbon emission during construction, is energy-saving and environment-friendly, and can be used for rutting disease maintenance and treatment at any time and anywhere without being affected by rainy weather and low temperature seasons.
[0044] 2) The water reaction type cold-mixed asphalt mixture in the application uses water as an activator to promote the rapid chemical gel solidification reaction of the diluent in the cold-mixed asphalt, so that the cold-mixed asphalt mixture can quickly form strength, solving the slow strength growth and water erosion of traditional cold-mixed asphalt mixture.
[0045] 3) The cold-mixed asphalt mixture based pavement structure provided by the application, the asphalt mixture-cement composite material of the upper layer 1 and the lower layer 3, has the characteristics of flexibility and rigidity itself, can reduce the rutting and shear displacement diseases of the pavement, effectively reduce the rutting and shear displacement diseases of the asphalt pavement, improve the pavement quality, and reduce the maintenance and repair frequency.
[0046] 4) The pavement structure provided by the application, through the bonding layer 2, the upper layer 1 and the lower layer 3 are bonded and connected to become a whole, reducing the relative sliding between the layers, which is beneficial to improve the stability of the pavement structure, and the multi-layer design can effectively improve the strength and quality of the pavement structure, and improve the service life of the pavement.
[0047] Optionally, the first water reaction type cold-mixed asphalt mixture includes a SPAC-13 poured semi-flexible mixture of the water reaction type cold-mixed asphalt mixture;
[0048] The second water reaction type cold-mixed asphalt mixture includes a SPAC-20 poured semi-flexible mixture of the water reaction type cold-mixed asphalt mixture.
[0049] In the application, the maximum nominal particle size of the SPAC-13 poured semi-flexible mixture is 13.2 mm; the maximum nominal particle size of the SPAC-20 poured semi-flexible mixture is 19 mm.
[0050] The cold-mixed asphalt of the water reaction type cold-mixed asphalt mixture in the SPAC-13 poured semi-flexible mixture is prepared by mixing dimethylformamide 0.5-0.7 parts, tung oil 0.3-0.4 parts, base asphalt 3-4 parts, and curing agent 0.015-0.02 parts, and the optimal oil-stone ratio is 3.5%, and the void ratio is 25-28%.
[0051] The cold-mixed asphalt of the water reaction type cold-mixed asphalt mixture in the SPAC-20 poured semi-flexible mixture of the lower layer is prepared by mixing dimethylformamide 0.5-0.7 parts, tung oil 0.3-0.5 parts, base asphalt 3-5 parts, and curing agent 0.02-0.025 parts, and the optimal oil-stone ratio is 3.0%, and the void ratio is 28-30%.
[0052] Cement mortar is used to fill into the paved asphalt mixture surface layer with a certain porosity to form a semi-flexible structure layer of cement mortar-asphalt mixture. The cement mortar is prepared by mixing ordinary portland cement 4-5 parts, sulphoaluminate cement 4-6 parts, fly ash 0.2-0.4 parts, quartz sand 2-5 parts, water reducing agent 0.002 parts, and water 4-6 parts.
[0053] In the application, the lower layer 3 plays a main supporting role, so its rigidity should be no less than that of the upper layer 1, and thus the porosity of the lower layer 3 is no less than that of the upper layer 1, so that more cement mortar can be filled into the lower layer 3 to improve its rigidity and strength.
[0054] Optionally, the bonding layer 2 comprises cationic SBR modified emulsified asphalt, SBS modified emulsified asphalt, water-based epoxy resin modified emulsified asphalt, or VAE modified emulsified asphalt.
[0055] In the application, the modified emulsified asphalt described above can be used for the adhesion of cold-mixed asphalt mixture.
[0056] The spraying amount of the modified emulsified asphalt as the bonding layer 2 is 0.5-0.8 kg / m 2 The evaporation residue content of the cationic SBR modified emulsified asphalt is no less than 50%.
[0057] Optionally, the thickness of the upper layer 1 is 40-45 mm; and the porosity of the first void is 25-28%.
[0058] In the application, the porosity of the upper layer 1 is 25-28%, which is relatively low, so that the upper layer is more flexible, thereby improving the elasticity of the upper layer 1 and being beneficial to improving the buffering performance of the upper layer 1.
[0059] Optionally, the thickness of the lower layer 3 is 60-65 mm; and the porosity of the second void is 28-30%.
[0060] In the application, the lower layer 3 has a relatively high porosity, so that more cement mortar can be filled, thereby improving the rigidity of the lower layer 3 and improving its supporting strength and durability. The lower layer 3 plays a role in supporting the upper layer, and has a relatively thick thickness, which can improve its supporting strength.
[0061] As shown in Figure 2 Optionally, a supporting layer 4 is arranged below the lower layer 3.
[0062] In the application, the supporting layer 4 can play a role in supporting and dispersing the road surface pressure.
[0063] As shown in Figures 2-4 Optionally, the supporting layer 4 comprises a substrate layer 41 and a drainage layer 42 from top to bottom in sequence;
[0064] The drainage layer 42 is paved by graded gravel with a particle size of 0.075-31.5 mm; the thickness of the drainage layer 42 is 4-10 cm;
[0065] The base layer 41 is a cement stabilized gravel layer, and the thickness is 50-60 cm;
[0066] The drainage groove 411 is symmetrically arranged on both sides of the base layer 41, and the end of the drainage groove 411 close to the central part of the base layer 41 is higher than the other end;
[0067] The drainage groove 411 is arranged in multiple, and the multiple drainage grooves 411 are arranged in an array along the length direction of the base layer 41.
[0068] In the present application, after the road surface structure is used for a long time, micro cracks will inevitably be generated, and rainwater will seep from the cracks in rainy weather, which will affect the overall structural safety of the road. The drainage layer 42 can timely drain the water seeped from the road surface structure and the underground seepage water, so as to avoid the road waterlogging and affect the driving safety.
[0069] In the present application, the graded gravel of the drainage layer 42 is a well-graded mixture with a certain proportion of coarse and fine gravel aggregates and stone chips, and the maximum nominal particle size is 31.5 mm. The gravel can be selected from high-strength gravel such as basalt and granite, and the stone chips are generally fine aggregates with a particle size of 5 mm screened from the gravel processed in the gravel yard.
[0070] In an implementable manner, the graded gravel in the drainage layer 42 can be mixed with road resin or asphalt to be paved into a layered structure with a void ratio of 25-28%. In this way, the graded gravel in the drainage layer 42 is connected into a whole by loose accumulation and paving, which is beneficial to improve the stability of the drainage layer 42.
[0071] As shown in FIGS. Figure 2 and Figure 3 Optionally, the deepest part of the drainage groove 411 is 1-2 cm;
[0072] The drainage groove 411 is filled with graded gravel with a particle size of 6-10 mm.
[0073] In the present application, the deepest part of the drainage groove 411 is set to 1-2 cm, which can avoid the adverse consequences of the excessively deep drainage groove 411, such as the damage to the structure of the base layer 41 and the influence on the structural stability and strength of the drainage layer 42. In the present application, the width of the drainage groove 411 can be set to 3-5 cm, and the distance between two adjacent drainage grooves 411 is 8-12 m. The drainage groove 411 is used in cooperation with the base layer 41, which can quickly drain the seepage water from the road structure, reduce the damage of water accumulation in the road surface structure to the road surface structure, and reduce the adverse effects of road waterlogging on driving safety. In the present application, the drainage groove 411 can be set as a groove opening (such asFigure 3 The groove can be set to be of different depths (as shown in the figure) to accelerate the drainage of the accumulated water; or can be set to be of equal depth, because the road itself is of a structure of high in the center and low on both sides when laid, and the drainage groove 411 is also of a structure of overall inclination to both sides when set to be of equal depth, and the depth of the drainage groove 411 is 1-2 cm when set to be of equal depth.
[0074] The pavement structure provided by the application can be applied to the repair of damaged pavement or the paving of newly-built roads.
[0075] The pavement structure in the embodiment, and the specific detection results are shown in Table 1.
[0076] Table 1
[0077]
[0078] The detection results described above increase the pavement shear index on the basis of the original specification.
[0079] As can be seen from the results in Table 1, the pavement structure provided by the application meets the use requirements of the asphalt pavement in all technical indexes.
[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the above embodiments, those skilled in the art should understand that; they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.
Claims
1. A pavement structure, characterized in that, The upper layer (1), the adhesive layer (2) and the lower layer (3) are arranged from top to bottom layer by layer; The upper layer (1) is paved by the first water-reactive cold-paved asphalt mixture containing the first void; The lower layer (3) is paved by the second water-reactive cold-paved asphalt mixture containing the second void; The void ratio of the first void is less than or equal to the void ratio of the second void, and the first void and the second void are filled by cement mortar.
2. The pavement structure of claim 1, wherein, The first water-reactive cold-paved asphalt mixture comprises the SPAC-13 poured semi-flexible mixture of the water-reactive cold-paved asphalt mixture; The second water-reactive cold-paved asphalt mixture comprises the SPAC-20 poured semi-flexible mixture of the water-reactive cold-paved asphalt mixture.
3. The pavement structure of claim 1, wherein, The adhesive layer (2) comprises cationic SBR modified emulsified asphalt, SBS modified emulsified asphalt, water-based epoxy resin modified emulsified asphalt or VAE modified emulsified asphalt.
4. The pavement structure of claim 1, wherein, The thickness of the upper layer (1) is 40-45mm; and the void ratio of the first void is 25-28%.
5. The pavement structure of claim 1, wherein, The thickness of the lower layer (3) is 60-65mm; and the void ratio of the second void is 28-30%.
6. The pavement structure of claim 1, wherein The support layer (4) is arranged below the lower layer (3).
7. The pavement structure of claim 6, wherein, The support layer (4) comprises the base layer (41) and the drainage layer (42) from top to bottom in sequence. The drainage layer (42) is paved by graded gravel with a particle size of 0.075-31.5mm; and the thickness of the drainage layer (42) is 4-10cm. The base layer (41) is a cement stabilized gravel layer with a thickness of 50-60cm. Drainage grooves (411) are symmetrically arranged on both sides of the base layer (41); one end of the drainage groove (411) close to the central part of the base layer (41) is higher than the other end; A plurality of drainage grooves (411) are arranged along the length direction of the base layer (41).
8. The pavement structure of claim 7, wherein, The deepest part of the drainage groove (411) is 1-2cm; The drainage groove (411) is filled with gravel with a particle size of 6-10mm.