CN115434207A - Reflection crack-free semi-rigid base pavement structure and construction method thereof - Google Patents
Reflection crack-free semi-rigid base pavement structure and construction method thereof Download PDFInfo
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- CN115434207A CN115434207A CN202211255740.0A CN202211255740A CN115434207A CN 115434207 A CN115434207 A CN 115434207A CN 202211255740 A CN202211255740 A CN 202211255740A CN 115434207 A CN115434207 A CN 115434207A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/02—Arrangement or construction of joints; Methods of making joints; Packing for joints
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
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Abstract
The invention belongs to the technical field of road and bridge construction, and particularly relates to a reflection crack-free semi-rigid base pavement structure and a construction method thereof. The technical points are as follows: from bottom to top, a semi-rigid base layer, a lower layer, a middle layer and an upper layer; wherein, a pre-cutting seam is arranged on the semi-rigid base layer, and a flexible splicing deformation seam is arranged on the lower layer; the flexible splicing deformation joint is arranged right above the precut seam, and the part which is larger than the precut seam is bilaterally symmetrical relative to the precut seam so as to precut the base layer; and polyester glass fiber cloth is adhered to the surface of the precut seam. The invention provides a semi-rigid base layer pavement structure without reflection cracks and a preparation method thereof.
Description
Technical Field
The invention belongs to the technical field of road and bridge construction, and particularly relates to a reflection crack-free semi-rigid base pavement structure and a construction method thereof.
Background
The semi-rigid base pavement is relatively common in China, and compared with the flexible base pavement widely adopted in European and American countries, the semi-rigid base pavement has the advantages of low manufacturing cost, high strength and the like. The semi-rigid base layer is generally paved by inorganic binder and broken stones, and is accompanied with the generation and the expansion of cracks in the use process, and further extends to the middle upper surface layer to form a reflection crack. Reflection cracks are widely present in various grades of semi-rigid base pavement and grow with the increase in service life, the number of axle loads, and the like.
The existing method for treating the reflection cracks is to additionally lay a stress absorption layer between a semi-rigid base layer and an asphalt surface layer, wherein the stress absorption layer is made of common materials such as modified asphalt waterproof felt, geotextile and the like. In the same way, a layer of open graded asphalt macadam mixture can be laid between the semi-rigid base course and the asphalt surface course to relieve the expansion of cracks. Reflection cracks are inhibited by increasing the thickness of an asphalt surface layer, but the method does not radically solve the problem of the reflection cracks, only relieves the development speed of the reflection cracks to a certain extent, and the final result of pavement structure damage caused by the reflection cracks cannot be thoroughly changed.
In view of the defects of the existing method for solving the reflection cracks and the importance of the structure, the inventor develops a reflection crack-free semi-rigid base pavement structure and a construction method thereof by matching theoretical analysis and innovation based on years of abundant experience and professional knowledge of the materials.
Disclosure of Invention
The invention aims to provide a semi-rigid base pavement structure without reflection cracks, wherein disordered cracking is regular by arranging a pre-cutting slit in the semi-rigid base, and high-elasticity high-toughness asphalt is poured into the pre-cutting slit to have certain deformability so as to absorb deformation caused by cracking of a bottom layer. The polyester glass fiber cloth is adhered above the precutting seams to further prevent the cracks from expanding upwards, the flexible splicing deformation seams have great deformation absorption capacity, and can completely absorb the deformation generated by the cracks of the bottom semi-rigid base layer and prevent the cracks from expanding towards the upper layer.
The technical purpose of the invention is realized by the following technical scheme:
the invention provides a semi-rigid base pavement structure without reflection cracks, which comprises a semi-rigid base, a lower layer, a middle layer and an upper layer from bottom to top;
wherein, a pre-cutting seam is arranged on the semi-rigid base layer, and a flexible splicing deformation seam is arranged on the lower layer; the flexible splicing deformation joint is bilaterally symmetrical relative to the pre-cutting joint; and polyester glass fiber cloth is adhered to the surface of the precut seam. The symmetrical structure can enable the two sides of the precutting seam of the base layer to be stressed uniformly, so that damage caused by local stress concentration is avoided. The width of the flexible splicing deformation joint is 16-40cm. The width of the material needs to satisfy the following requirement: l = L 1 *H
In the formula: l is the width of the deformation joint, L 1 Is the kerf width and H is the kerf depth.
The formula corresponds the flexible splicing width and the precutting seam area, so that the flexible splicing width is in a reasonable interval, and the flexible splicing is ensured to cover the precutting seam all the time. Meanwhile, along with the increase of the depth of the cutting seam, the flexible splicing is widened, and the concrete plates on two sides of the precut cutting seam are prevented from being damaged due to the influence of overlarge concentrated stress. Further, the width of the flexible splicing deformation joint is 18 to 40cm.
Further, the flexible splicing deformation joint adopts a flexible asphalt mixture and comprises the following components in parts by weight: 30-35 parts of high-elastic high-toughness asphalt and 60-70 parts of single-grain-diameter basalt broken stone; wherein the particle size of the basalt broken stone with a single particle size is 16-19mm. According to the invention, the single-grain-size aggregate is adopted to form the coarse aggregate framework, so that the compression resistance of the flexible splicing deformation joint is improved, and regular pores are formed among the single-grain-size aggregate, so that the uniform filling of high-elasticity and high-toughness asphalt is facilitated, and the stable performance of the whole flexible splicing deformation joint is ensured.
Further, the width of the precut slot is 2 to 4cm, the length of the precut slot is equal to the width of the semi-rigid base layer, and the depth of the slit is 40 to 50 percent of the thickness of the semi-rigid base layer.
Further, the distance between two adjacent precuts is 15 to 20cm.
Further, high-elasticity and high-toughness asphalt is poured into the pre-cutting seam, the heating temperature of the high-elasticity and high-toughness asphalt is 190-210 ℃, the pouring temperature is more than or equal to 180 ℃, and the pouring amount is such that the asphalt surface is flush with the semi-rigid base layer. At the temperature, the high-elasticity high-toughness asphalt is completely melted and has better fluidity, so that the high-elasticity high-toughness asphalt can be conveniently and fully poured into aggregates.
Furthermore, the width of the polyester glass fiber cloth ranges from 20 to 30cm, the polyester glass fiber cloth is laid on the pre-cutting seam, and the part, larger than the pre-cutting seam, of the polyester glass fiber cloth is symmetrical left and right relative to the pre-cutting seam.
Further, non-stick wheel emulsified asphalt is sprayed on the surface of the polyester glass fiber cloth, and the spraying amount is 1.5 to 2kg/m 2 。
Furthermore, the polyester glass fiber cloth and the semi-rigid base layer are bonded by adopting an epoxy interface agent, and the coating weight of the epoxy interface agent is 0.8 to 1.2kg/m 2 。
The second purpose of the invention is to provide a construction method of a semi-rigid base pavement structure without reflection cracks, which has the same technical effect.
The technical purpose of the invention is realized by the following technical scheme:
the invention provides a construction method of a semi-rigid base pavement structure without reflection cracks, which specifically comprises the following operation steps:
s1, arranging a pre-cutting seam on the surface of the semi-rigid base layer at intervals of 15-20m for 2.5-4 d after the semi-rigid base layer is paved;
s2, heating the high-elasticity high-toughness asphalt to a flowing state, pouring the high-elasticity high-toughness asphalt into the pre-cut seam of the semi-rigid base layer by adopting pouring equipment, and coating a layer of high-elasticity high-toughness asphalt on the surface of the pre-cut seam again after the asphalt is infiltrated and cooled so as to enable the surface of the pre-cut seam to be flat and smooth;
s3, scattering non-stick wheel emulsified asphalt on the surface of the semi-rigid base layer to serve as a bonding layer, marking the pre-cut seam position, and then paving the lower layer of the pavement structure;
s4, after the paving of the lower layer is finished and the curing is finished, cutting and grooving the lower layer at the marked position of the pre-cutting seam, and cleaning the groove;
s5, adhering polyester glass fiber cloth at the position of the pre-cut seam of the semi-rigid base layer, wherein the polyester glass fiber cloth is bilaterally symmetrical relative to the pre-cut seam, and the adhesive for adhesion is an epoxy interface agent;
s6, coating a layer of high-elasticity high-toughness asphalt on the surface of the polyester glass fiber cloth at the bottom of the groove, then pouring the flexible asphalt mixture to half depth of the groove, tamping, and pouring a layer of high-elasticity high-toughness asphalt again; tamping again, and pouring a layer of high-elastic high-toughness asphalt;
s7, after cooling, pouring the last layer of high-elasticity high-toughness asphalt into the flexible splicing deformation joint, and leveling the surface;
and S8, after the flexible splicing deformation joint is cooled and solidified, constructing the middle surface layer and the upper surface layer of the pavement structure, and opening the traffic after the curing is finished.
As a preferable aspect of the above technical solution, the specific operation steps in step S6 are: the surface of the polyester glass fiber cloth at the bottom of the groove is coated with a layer of high-elastic and high-toughness asphalt in a coating amount of 30 to 32kg/m 2 Then pouring the flexible asphalt mixture to half the depth of the groove; tamping by a small plate compactor, and pouring a layer of high-elasticity and high-toughness asphalt again with the dosage of about 60 to 65kg/m 2 (ii) a Tamping by using a small plate compactor again, and pouring a layer of high-elasticity high-toughness asphalt with the dosage of about 60 to 65kg/m 2 . The layering is built in order to reduce the thickness of pouring on every layer, can be so that the abundant that high-elastic high tenacity pitch was poured, through the layering compaction for the high-elastic high tenacity pitch come-up of prime coat and intermediate layer can reduce the inside hole of flexible concatenation movement joint, makes the flexible concatenation movement joint closely knit.
Preferably, in the step S7, the pouring amount of the high-elasticity high-toughness asphalt is 50 to 55kg/m 2 。
In conclusion, the invention has the following beneficial effects:
the reflection crack-free semi-rigid base pavement structure provided by the invention solves the problem of reflection cracks of the traditional semi-rigid base pavement. Thereby through setting up the joint-cutting in advance with the unordered crack development of semi-rigid base course become regular, flexible concatenation technology has very big deformation absorbing capacity, thereby can absorb the stress variation that the base course conduction comes and avoid the production and the extension of crack.
Drawings
FIG. 1 is a schematic view of the pavement structure of the present invention.
Reference numerals
1 is an upper layer; 2 is a middle surface layer; 3 is a lower layer; 4, flexible splicing deformation joints; 5 is polyester glass fiber cloth; 6, pre-cutting a seam; and 7 is a semi-rigid base layer.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description is provided for a reflection crack-free semi-rigid base pavement structure and its construction method, and its specific implementation, features and effects.
In the embodiment mode, the raw material sources are as follows:
high-elasticity high-toughness asphalt: jiangsu Zhonglu new material science and technology development limited;
wheel-sticking-free emulsified asphalt: jiangsu Zhongyi passway New Material Co., ltd;
epoxy interfacial agent: zhongluo Ke science and technology GmbH;
crushing basalt: jiangsu Maodi group, inc.;
polyester glass fiber cloth: jiangsu Jitong composite Limited.
As shown in fig. 1, the semi-rigid base pavement structure without reflection cracks includes, from bottom to top, a semi-rigid base 7, a lower surface layer 3, a middle surface layer 2 and an upper surface layer 1;
wherein, a pre-cutting seam 6 is arranged on the semi-rigid base layer 7, and a flexible splicing deformation joint 4 is arranged on the lower layer 3; the flexible splicing deformation joint 4 is arranged right above the precut joint 6, and the part larger than the precut joint 6 is bilaterally symmetrical relative to the precut joint 6 so that two sides of the precut joint 6 of the base layer are uniformly stressed and damage caused by local stress concentration is avoided; and polyester glass fiber cloth is adhered to the surface of the pre-cutting seam 6 to improve the crack resistance of the cutting seam.
The construction method comprises the following steps:
s1, in 3d after the semi-rigid base layer 7 is paved, pre-cutting seams 6 are arranged on the surface of the semi-rigid base layer at intervals of 20m, the depth of each pre-cutting seam 6 is 40% of the thickness of the semi-rigid base layer 7 and is 8cm, and the width of each cutting seam is 2cm;
s2, heating the high-elasticity high-toughness asphalt to 210 ℃ to keep the high-elasticity high-toughness asphalt in a flowing state, pouring the high-elasticity high-toughness asphalt into the pre-cut seams 6 of the semi-rigid base layer 7 by adopting special pouring equipment, and after the asphalt is infiltrated and cooled, coating a layer of high-elasticity high-toughness asphalt on the surfaces of the pre-cut seams 6 again to enable the surfaces of the high-elasticity high-toughness asphalt to be smooth;
s3, sprinkling non-stick wheel emulsified asphalt on the surface of the semi-rigid base layer to serve as a sticky layer, marking the position of the precut seam 6, and paving the lower surface layer 3 of the pavement structure according to a set construction process;
s4, after the lower layer 2 is paved and the curing is finished, cutting and grooving the marked precutting position, wherein the cutting width is according to the formula L = L 1 * H is calculated to be 2 x 8= 1695m, and excavation and cleaning are carried out;
s5, adhering polyester glass fiber cloth at the position of the pre-cut seam 6 of the semi-rigid base layer 7, wherein the polyester glass fiber cloth is 8cm in width and is bilaterally symmetrical relative to the pre-cut seam 6, the adhesive for adhesion is an epoxy interface agent, and the coating weight is 1.2kg/m 2 ；
S6, coating a layer of high-elasticity and high-toughness asphalt on the surface of the polyester glass fiber cloth at the bottom of the groove, wherein the coating weight is 32kg/m 2 Then pouring the flexible asphalt mixture to half the depth of the groove; tamping with a small plate compactor, and pouring a layer of high-elasticity high-toughness asphalt with the dosage of about 65kg/m 2 (ii) a Tamping again with a small plate compactor, pouring a layer of high-elasticity high-toughness asphalt with the dosage of about 65kg/m 2 ；
S7, after cooling, pouring the last layer of high-elasticity high-toughness asphalt into the flexible splicing deformation joint to level the surface, wherein the pouring amount is about 55kg/m 2 ；
And S8, after the flexible splicing deformation joint is cooled and solidified, constructing the middle surface layer 2 and the upper surface layer 1 of the pavement structure, ensuring the curing time according to a set construction process, and opening the traffic after curing.
Comparative examples
The semi-rigid base layer pavement structure provided by the comparative embodiment comprises a pre-cutting seam arranged on the semi-rigid base layer, high-elasticity and high-toughness asphalt filled in the pre-cutting seam, and polyester glass fiber cloth adhered on the pre-cutting seam.
The construction method comprises the following steps:
s1, in 3d after the semi-rigid base layer is paved, pre-cutting seams are arranged on the surface of the semi-rigid base layer at intervals of 20m, and the pre-cutting seam depth is 40% of the thickness of the semi-rigid base layer, and the width of each cutting seam is 2cm;
s2, heating the high-elasticity high-toughness asphalt to 210 ℃ to keep the high-elasticity high-toughness asphalt in a flowing state, pouring the high-elasticity high-toughness asphalt into the pre-cut seam of the semi-rigid base layer by adopting special pouring equipment, and coating a layer of high-elasticity high-toughness asphalt on the surface of the pre-cut seam again after the asphalt is infiltrated and cooled to enable the surface of the pre-cut seam to be flat and smooth;
s3, sprinkling non-stick wheel emulsified asphalt on the surface of the semi-rigid base layer to serve as a sticky layer, marking the pre-cut seam position, and then paving the lower surface layer of the pavement structure according to a set construction process;
s4, after the lower surface layer is paved and the curing is finished, adhering polyester glass fiber cloth at the position of the pre-cut seam of the semi-rigid base layer, wherein the polyester glass fiber cloth is 8cm in width and is bilaterally symmetrical relative to the pre-cut seam, the adhesive for adhering is an epoxy interface agent, and the coating amount is 1.2kg/m 2 ；
And S5, constructing the middle surface layer and the upper surface layer of the pavement structure, ensuring the curing time according to a set construction process, and opening the traffic after curing.
And (3) performance testing:
according to the data comparison, the pavement structure provided by the invention can effectively improve the anti-permeability performance of the pavement and reduce the rigidity loss.
Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention.
Claims (10)
1. A semi-rigid base pavement structure without reflection cracks is characterized by comprising a semi-rigid base, a lower layer, a middle layer and an upper layer from bottom to top;
wherein, a pre-cutting seam is arranged on the semi-rigid base layer, and a flexible splicing deformation seam is arranged on the lower layer; the flexible splicing deformation joint is arranged right above the precut seam, and the part larger than the precut seam is bilaterally symmetrical relative to the precut seam so as to precut the base layer; and polyester glass fiber cloth is adhered to the surface of the precut seam.
2. The semi-rigid base pavement structure without the reflection cracks as claimed in claim 1, wherein the width of the flexible splicing deformation joint is 16-40cm; the width of the material needs to satisfy the following requirement:
L=L 1 *H
in the formula: l is the width of the deformation joint, L 1 Is the kerf width and H is the kerf depth.
3. The semi-rigid base pavement structure without the reflection cracks as claimed in claim 2 or 3, wherein the flexible splicing deformation joint is made of a flexible asphalt mixture and comprises the following components in parts by weight: 30 to 35 parts of high-elastic high-toughness asphalt and 60 to 70 parts of single-particle-diameter basalt macadam; the particle size of the basalt broken stone with the single particle size is 16-19mm.
4. The semi-rigid base pavement structure without the reflection cracks as claimed in claim 1, wherein the width of the precut is 2-4 cm, the length of the precut is equal to the width of the semi-rigid base, and the depth of the slit is 40-50% of the thickness of the semi-rigid base.
5. The semi-rigid pavement structure without reflective cracks as claimed in claim 1, wherein the distance between two adjacent precuts is 15-20cm.
6. The semi-rigid base pavement structure without the reflection cracks as claimed in claim 1, wherein the pre-cut seam is filled with high-elasticity high-toughness asphalt, the heating temperature of the high-elasticity high-toughness asphalt is 190-210 ℃, the filling temperature is not less than 180 ℃, and the filling amount is such that the asphalt surface and the semi-rigid base pavement are flush.
7. The semi-rigid pavement structure without reflective cracks of claim 1, wherein the polyester fiberglass cloth is laid on the pre-cut slits, and the portions of the polyester fiberglass cloth larger than the pre-cut slits are left-right symmetrical relative to the pre-cut slits; the width of the polyester glass fiber cloth is half of that of the flexible splicing deformation joint and is 8-20cm.
8. The semi-rigid pavement structure without reflection cracks of claim 1, wherein the polyester fiberglass cloth is coated with the wheel-free emulsified asphalt in an amount of 1.5-2kg/m 2 。
9. The semi-rigid pavement structure without reflective cracks of claim 1, wherein the polyester glass fiber cloth and the semi-rigid pavement are bonded by an epoxy interface agent, and the coating weight of the epoxy interface agent is 0.8 to 1.2kg/m 2 。
10. The construction method of the semi-rigid base pavement structure without the reflection cracks as claimed in any one of claims 1 to 9, characterized by comprising the following steps:
s1, arranging a pre-cutting seam on the surface of the semi-rigid base layer at intervals of 15-20m for 2.5-4 d after the semi-rigid base layer is paved;
s2, heating the high-elasticity high-toughness asphalt to a flowing state, pouring the high-elasticity high-toughness asphalt into the pre-cut seam of the semi-rigid base layer by adopting pouring equipment, and coating a layer of high-elasticity high-toughness asphalt on the surface of the pre-cut seam again after the asphalt is infiltrated and cooled so as to enable the surface of the pre-cut seam to be flat and smooth;
s3, scattering non-stick wheel emulsified asphalt on the surface of the semi-rigid base layer to serve as a bonding layer, marking the pre-cut seam position, and then paving the lower layer of the pavement structure;
s4, after the paving of the lower layer is finished and the curing is finished, cutting and grooving the lower layer at the marked position of the pre-cutting seam, and cleaning the groove;
s5, adhering polyester glass fiber cloth at the position of the pre-cut seam of the semi-rigid base layer, wherein the polyester glass fiber cloth is bilaterally symmetrical relative to the pre-cut seam, and the adhesive for adhesion is an epoxy interface agent;
s6, coating a layer of high-elasticity high-toughness asphalt on the surface of the polyester glass fiber cloth at the bottom of the groove, then pouring the flexible asphalt mixture to half depth of the groove, tamping, and pouring a layer of high-elasticity high-toughness asphalt again; tamping again, and pouring a layer of high-elastic high-toughness asphalt;
s7, after cooling, pouring the last layer of high-elasticity high-toughness asphalt into the flexible splicing deformation joint, and leveling the surface;
and S8, after the flexible splicing deformation joint is cooled and solidified, constructing the middle surface layer and the upper surface layer of the pavement structure, and opening the traffic after the curing is finished.
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| CN217438599U (en) * | 2021-07-06 | 2022-09-16 | 福建船政交通职业学院 | Composite structure for preventing reflection crack concrete pavement |
| CN217351992U (en) * | 2022-01-24 | 2022-09-02 | 湖南三一工业职业技术学院 | Road surface joint processing structure for preventing reflection cracks |
| CN114737427A (en) * | 2022-04-02 | 2022-07-12 | 中能建路桥工程有限公司 | Splice structure for inhibiting asphalt pavement reflection cracks |
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