CN113668319A - Concrete pavement lifting structure and method - Google Patents
Concrete pavement lifting structure and method Download PDFInfo
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- CN113668319A CN113668319A CN202110996427.1A CN202110996427A CN113668319A CN 113668319 A CN113668319 A CN 113668319A CN 202110996427 A CN202110996427 A CN 202110996427A CN 113668319 A CN113668319 A CN 113668319A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000010426 asphalt Substances 0.000 claims abstract description 139
- 239000010410 layer Substances 0.000 claims abstract description 116
- 239000004576 sand Substances 0.000 claims abstract description 42
- 239000013521 mastic Substances 0.000 claims abstract description 40
- 101100257124 Caenorhabditis elegans sma-10 gene Proteins 0.000 claims abstract description 39
- 238000002156 mixing Methods 0.000 claims abstract description 39
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- 239000000203 mixture Substances 0.000 claims description 43
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Classifications
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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
- E01C7/325—Joining different layers, e.g. by adhesive layers; Intermediate layers, e.g. for the escape of water vapour, for spreading stresses
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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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/08—Apparatus for transporting and heating or melting asphalt, bitumen, tar, or the like
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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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
-
- 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
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/09—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges
- E01C23/096—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges for forming, opening-out, cleaning, drying or heating and filling
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Road Paving Structures (AREA)
Abstract
In order to solve the problems of driving comfort and potential safety hazards caused by the fact that a concrete pavement is damaged in the prior art, the embodiment of the invention provides a concrete pavement lifting structure and a concrete pavement lifting method. Concrete road surface promotes structure includes: a high-viscosity asphalt seal layer, a high-viscosity asphalt mortar layer, a warm-mixing modified SMA-10 layer and a sticky layer; the method comprises the following steps: treating the concrete pavement with crack diseases; if no crack is detected, performing shot blasting and bone exposing treatment on the concrete pavement; paving a high-viscosity asphalt seal layer on the concrete pavement after the shot blasting and bone exposing treatment is carried out on the concrete pavement; sequentially laying a high-viscosity asphalt mastic sand layer and a warm-mixing modified SMA-10 layer on the high-viscosity asphalt seal layer, spreading an adhesive layer between the high-viscosity asphalt mastic sand layer and the warm-mixing modified SMA-10 layer, re-marking after compacting, milling an asphalt concrete surface layer at the lap joint, and re-laying 1-2 layers of warm-mixing modified SMA-13. The embodiment of the invention realizes the change of the concrete pavement into the asphalt pavement, thereby improving and promoting the structural quality of the concrete pavement.
Description
Technical Field
The invention relates to a concrete pavement lifting structure and a method.
Background
The concrete pavement of the tunnel is worn for many years, so that the friction force is small, and vehicles are easy to slip to cause traffic accidents. The concrete pavement of the tunnel is damaged along with the increase of traffic volume along the line, the rubbing collision of vehicles and the long-term abrasion, and concrete of a part of the road section is peeled off to form a pit groove. The concrete pavement has poor flatness, strong bumping sense, poor driving comfort, larger driving noise and larger harm to the driving safety.
Disclosure of Invention
In order to solve the problems of driving comfort and potential safety hazards caused by the fact that a concrete pavement is damaged in the prior art, the embodiment of the invention provides a concrete pavement lifting structure and a concrete pavement lifting method.
The embodiment of the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a concrete pavement lifting structure, including:
the high-viscosity asphalt seal layer is arranged on the surface of the concrete pavement;
the high-viscosity asphalt mastic sand layer is arranged on the surface of the high-viscosity asphalt seal layer;
the warm mixing modified SMA-10 layer is arranged on the surface of the high-viscosity asphalt mastic sand layer; and
and the adhesive layer is arranged between the high-viscosity asphalt mastic sand layer and the warm-mixed modified SMA-10 layer and is used for bonding the high-viscosity asphalt mastic sand layer and the warm-mixed modified SMA-10 layer.
Further, the thickness of the high-viscosity asphalt mastic sand layer is more than 2cm, and the thickness of the warm-mixing modified SMA-10 layer is more than 3 cm.
Further, the adhesive layer is a PCR modified emulsified asphalt adhesive layer.
Further, the mass ratio of the solid raw materials in the warm-mix modified SMA-10 layer is as follows: 11-16mm particle size basalt: 5-11mm of basalt with the grain size: 0-4mm basalt: 55 parts of mineral powder: 13: 17-20: 12; the mass fraction of the asphalt in the warm-mixed modified SMA-10 layer is 6.2 percent of the mass of all basalt and mineral powder, and the porosity of the warm-mixed modified SMA-10 layer is 2.9-5.1 percent.
Further, the mass ratio of the solid raw materials in the high-viscosity asphalt mastic sand layer is as follows: basalt with a particle size of 3-5 mm: 0-3mm particle size of basalt: the mineral powder is 55:34: 11; the mass fraction of the asphalt in the high-viscosity asphalt mastic sand layer is 7.1% of the mass of the high-viscosity asphalt mastic sand layer, and the porosity of the high-viscosity asphalt mastic sand layer is 2.1-2.6%.
In a second aspect, an embodiment of the present invention provides a concrete pavement lifting method with the lifting structure, including:
treating the concrete pavement with crack diseases; if no crack is detected, performing shot blasting and bone exposing treatment on the concrete pavement;
paving a high-viscosity asphalt seal layer on the concrete pavement after the shot blasting and bone exposing treatment is carried out on the concrete pavement;
sequentially laying a high-viscosity asphalt mastic sand layer and a warm-mixing modified SMA-10 layer on the high-viscosity asphalt seal layer, spreading an adhesive layer between the high-viscosity asphalt mastic sand layer and the warm-mixing modified SMA-10 layer, re-marking after compacting, milling an asphalt concrete surface layer at the lap joint, and re-laying 1-2 layers of warm-mixing modified SMA-13.
Further, before the shot blasting and bone exposing treatment of the concrete pavement, the method further comprises the following steps: cleaning a road surface; the thickness of the warm mixing modified SMA-13 is 4 cm.
Further, performing shot blasting and bone exposing treatment on the concrete pavement; the method comprises the step of performing shot blasting bone exposure treatment on the concrete pavement so that the shot blasting bone exposure rate of the concrete pavement after the shot blasting bone exposure treatment is more than 30%.
Further, if the crack diseases exist, the treatment is carried out; if no crack is damaged, paving a high-viscosity asphalt seal layer on the treated concrete pavement, wherein the steps of: if the crack is damaged and the crack width L is less than 3mm, sealing the crack by using a high-viscosity asphalt seal; if the cracks are damaged and the width L of the cracks is more than or equal to 3mm, adopting crack expanding grouting and pasting anti-crack paste treatment.
Furthermore, the spreading amount of the high-viscosity modified asphalt is controlled to be 1.5-1.8kg/m when the high-viscosity asphalt seal coat is laid2The crushed stone is prepared by pre-mixing 5-10mm basalt with the spreading amount of the crushed stone meeting the full-paving rate of 50-60%;
the adhesive layer is made of PCR modified emulsified asphalt, the content of residues in the PCR modified emulsified asphalt is not less than 50%, and the dosage of the adhesive layer is 0.3-0.6L/m2；
The high-viscosity asphalt mastic sand layer is prepared from AC-5 high-viscosity asphalt mastic sand, in the preparation process, the asphalt heating temperature is controlled to be 185-plus 190 ℃, the mineral aggregate heating temperature is controlled to be 190-plus 195 ℃, the mixture mixing temperature after the asphalt and the mineral aggregate are mixed is controlled to be 185-plus 190 ℃, and the delivery temperature of the mixture is controlled to be 180-plus 185 ℃;
the warm-mix modified SMA-10 layer is prepared by a warm-mix process, and in the preparation process, the heating temperature of asphalt is 185 ℃; the heating temperature of the mineral aggregate is 190-200 ℃; the discharge temperature of the mixture after the asphalt and the mineral aggregate are mixed is controlled at 185 ℃.
In the preparation process of the warm-mixed modified SMA-13, the heating temperature of the asphalt is 160-165 ℃; the heating temperature of the mineral aggregate is 190-220 ℃; the discharge temperature of the mixture after the asphalt and the mineral aggregate are mixed is 170-185 ℃.
Compared with the prior art, the embodiment of the invention has the following advantages and beneficial effects:
according to the concrete pavement lifting structure and method provided by the embodiment of the invention, the concrete pavement (white) is changed into the asphalt pavement (black) through the lifting structure; the method realizes the change from white to black of the tunnel concrete pavement, namely, the tunnel concrete pavement is changed into the asphalt pavement from the concrete pavement, thereby improving and promoting the structural quality of the concrete pavement and solving the problems of driving comfort and potential safety hazard caused by the damaged concrete pavement.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of a concrete pavement lifting structure.
Fig. 2 is a schematic view of a shot blasting process.
Fig. 3 is a schematic view of secondary blasting treatment.
FIG. 4 is a graph illustrating the effect of large and uneven application of a hot asphalt sealer.
FIG. 5 is a schematic view of a pavement after rolling is completed.
FIG. 6 is a view showing the flatness of the site after the construction is completed.
Reference numbers and corresponding part names in the drawings:
1-warm mixing modified SMA-10 layers, 2-sticky layers, 3-high-viscosity asphalt glue sand layers, 4-high-viscosity asphalt seal layers and 5-concrete pavements.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.
Examples
In a first aspect, referring to fig. 1, an embodiment of the present invention provides a concrete pavement lifting structure, including:
the high-viscosity asphalt seal layer 4 is arranged on the surface of the concrete pavement 5;
the high-viscosity asphalt mastic sand layer 3 is arranged on the surface of the high-viscosity asphalt seal layer;
the warm mixing modified SMA-10 layer 1 is arranged on the surface of the high-viscosity asphalt mortar layer; and
and the adhesive layer 2 is arranged between the high-viscosity asphalt mastic sand layer and the warm-mixed modified SMA-10 layer and is used for bonding the high-viscosity asphalt mastic sand layer and the warm-mixed modified SMA-10 layer.
Further, the thickness of the high-viscosity asphalt mastic sand layer is more than 2cm, and the thickness of the warm-mixing modified SMA-10 layer is more than 3 cm.
Further, the adhesive layer is a PCR modified emulsified asphalt adhesive layer.
Further, the mass ratio of the solid raw materials in the warm-mix modified SMA-10 layer is as follows: 11-16mm particle size basalt: 5-11mm of basalt with the grain size: 0-4mm basalt: 55 parts of mineral powder: 13: 17-20: 12; the mass fraction of the asphalt in the warm-mixed modified SMA-10 layer is 6.2 percent of the mass of all basalt and mineral powder, and the porosity of the warm-mixed modified SMA-10 layer is 2.9-5.1 percent.
The particle size range of basalt in the present invention means that the basalt used contains basalt particles of all sizes different within the particle size range. For example, basalt with a particle size of 5-11mm means that basalt particles with particle sizes of 5-11mm and different sizes are contained in the basalt.
Further, the mass ratio of the solid raw materials in the high-viscosity asphalt mastic sand layer is as follows: basalt with a particle size of 3-5 mm: 0-3mm particle size of basalt: the mineral powder is 55:34: 11; the mass fraction of the asphalt in the high-viscosity asphalt mastic sand layer is 7.1% of the mass of the high-viscosity asphalt mastic sand layer, and the porosity of the high-viscosity asphalt mastic sand layer is 2.1-2.6%.
In a second aspect, an embodiment of the present invention provides a concrete pavement lifting method with the lifting structure, including:
treating the concrete pavement with crack diseases; if no crack is detected, performing shot blasting and bone exposing treatment on the concrete pavement;
paving a high-viscosity asphalt seal layer on the concrete pavement after the shot blasting and bone exposing treatment is carried out on the concrete pavement;
sequentially laying a high-viscosity asphalt mastic sand layer and a warm-mixing modified SMA-10 layer on the high-viscosity asphalt seal layer, spreading an adhesive layer between the high-viscosity asphalt mastic sand layer and the warm-mixing modified SMA-10 layer, re-marking after compacting, milling an asphalt concrete surface layer at the lap joint, and re-laying 1-2 layers of warm-mixing modified SMA-13.
Further, before the shot blasting and bone exposing treatment of the concrete pavement, the method further comprises the following steps: cleaning a road surface; the thickness of the warm mixing modified SMA-13 is 4 cm.
Further, performing shot blasting and bone exposing treatment on the concrete pavement; the method comprises the step of performing shot blasting bone exposure treatment on the concrete pavement so that the shot blasting bone exposure rate of the concrete pavement after the shot blasting bone exposure treatment is more than 30%.
Further, if the crack diseases exist, the treatment is carried out; if no crack is damaged, paving a high-viscosity asphalt seal layer on the treated concrete pavement, wherein the steps of: if the crack is damaged and the crack width L is less than 3mm, sealing the crack by using a high-viscosity asphalt seal; if the cracks are damaged and the width L of the cracks is more than or equal to 3mm, adopting crack expanding grouting and pasting anti-crack paste treatment.
Furthermore, the spreading amount of the high-viscosity modified asphalt is controlled to be 1.5-1.8kg/m when the high-viscosity asphalt seal coat is laid2The crushed stone is prepared by pre-mixing 5-10mm basalt with the spreading amount of the crushed stone meeting the full-paving rate of 50-60%;
the adhesive layer is made of PCR modified emulsified asphalt, the content of residues in the PCR modified emulsified asphalt is not less than 50%, and the dosage of the adhesive layer is 0.3-0.6L/m2；
The high-viscosity asphalt mastic sand layer is prepared from AC-5 high-viscosity asphalt mastic sand, in the preparation process, the asphalt heating temperature is controlled to be 185-plus 190 ℃, the mineral aggregate heating temperature is controlled to be 190-plus 195 ℃, the mixture mixing temperature after the asphalt and the mineral aggregate are mixed is controlled to be 185-plus 190 ℃, and the delivery temperature of the mixture is controlled to be 180-plus 185 ℃;
the warm-mix modified SMA-10 layer is prepared by a warm-mix process, and in the preparation process, the heating temperature of asphalt is 185 ℃; the heating temperature of the mineral aggregate is 190-200 ℃; the discharge temperature of the mixture after the asphalt and the mineral aggregate are mixed is controlled at 185 ℃.
In the preparation process of the warm-mixed modified SMA-13, the heating temperature of the asphalt is 160-165 ℃; the heating temperature of the mineral aggregate is 190-220 ℃; the discharge temperature of the mixture after the asphalt and the mineral aggregate are mixed is 170-185 ℃.
Specific examples
A concrete pavement lifting structure and a lifting method are adopted by Shandong province high-speed road and bridge maintenance Limited company, GF Jinghusu tunnel segment is maintained specially in 4 months in 2020, and white-to-black maintenance is carried out on the Jupiter tunnel segment and the Jupiter tunnel segment.
The tunnel pavement disposal scheme comprises the following steps: after the pavement is cleaned, performing shot blasting on the surface of concrete and treating corresponding crack diseases, paving a high-viscosity asphalt sealing layer, paving a 2cm high-viscosity asphalt mortar stress absorption layer and a 3cm warm-mix modified SMA-10, spreading an adhesive layer between layers, and re-marking the marked lines after compaction; milling a 4 cm-thick asphalt concrete surface layer within the range of 25m at the lap joint, re-paving 1-2 layers of warm-mixed modified SMA-13 down slopes, spreading a PCR emulsified asphalt adhesive layer between the asphalt layers, and paving a high-viscosity asphalt seal layer between the new and old pavement structure layers.
1. Grading composition design
(1) Debugging of production ratio of SMA-10
In 11 days 4 months in 2020, the mixing proportion of SMA-10 production is adjusted, 3 mixing proportions are adopted for adjustment, and extraction screening and Marshall compaction tests are respectively carried out.
The mixtures were separately taken from the mixing station for marshall compaction and extraction screening tests according to the three production grades set, and the results are shown in table 1 below.
TABLE 1 results of different production gradation volume indexes
And forming Marshall test pieces with 6.2 percent and 6.5 percent of asphalt dosage in a room respectively, and finally determining the production ratio as follows according to the volume index test result:
11-16mm basalt: 5-11mm basalt: 0-4mm basalt: the mineral powder is 55:13:20:12, and the dosage of the asphalt is 6.2%.
The production ratio is adjusted to be
11-16mm basalt: 5-11mm basalt: 0-4mm basalt: the mineral powder is 58:13:17:12, and the dosage of the asphalt is 6.2%.
(2) Production ratio debugging of asphalt mortar
In 13 days 4 months in 2020, the mix proportion of the asphalt mortar production is adjusted, 2 mix proportions are adopted for adjustment, a group of mix proportions are automatically adjusted by a construction unit for comparison, and extraction screening and Marshall compaction tests are respectively carried out.
The mixture is respectively taken from a mixing station according to three set production grades to carry out Marshall compaction and extraction screening tests, and the test results are as follows.
TABLE 2 results of different production gradation volume indexes
According to the volume index test result, the production ratio is finally determined as follows:
3-5mm basalt: 0-3mm basalt: the mineral powder is 55:34:11, and the dosage of the asphalt is 7.1%.
The production ratio is adjusted to be
3-5mm basalt: 0-3mm basalt: the mineral powder is 55:34:11, and the dosage of the asphalt is 7.1%.
2. Question and consultation suggestion in construction process
(1) Concrete panel treatment
Treating diseases of the concrete panel of the original pavement according to the requirements of design documents: firstly, for the diseases with crack width L less than 3mm, sealing the crack by using a high-viscosity asphalt seal; secondly, for the diseases with the crack width L more than or equal to 3mm, adopting seam expanding grouting and pasting anti-crack paste for treatment; then, sundries, mud and dust attached to the old pavement are comprehensively cleaned, and the concrete panel is subjected to shot blasting treatment.
The concrete panel is treated by shot blasting, so that fresh aggregate and concrete layers are exposed on the surface of the concrete. The appearance of the concrete surface is checked before construction, and the bridge surface is ensured not to have the phenomena of exposed ribs, exposed teeth and the like. The surface treatment is a surface pretreatment process before the construction of shot blasting treatment, and comprises the steps of cleaning and removing attachments such as oil stains, rust stains, release agents, sundries, dust and the like on the surface of the bridge deck by using a cleaning agent or a solvent and a tool. So as to prevent the substances from polluting the grinding materials in the shot blasting process, ensure that the treated concrete surface has a clean and fresh surface and ensure that the bonding layer (or the paving layer) is firmly combined with the surface of the concrete panel.
As shown in fig. 2 after the primary shot blasting treatment, there are certain problems: after the shot blasting treatment of the concrete panel of the old pavement, the surface laitance still exists and is distributed unevenly; the treatment of the marked lines on the old pavement is not thorough, and the bonding of the asphalt layer is influenced; the edge of the old pavement is not thoroughly treated; therefore, a secondary blasting process is subsequently performed, as shown in fig. 3.
Consulting and suggesting:
1) the concrete bridge deck is treated by thoroughly cleaning surface laitance to ensure the roughness of the surface and a certain bone exposing rate;
2) after the concrete panel is treated, the concrete panel must be thoroughly cleaned, so that the surface is free of dust or floating slurry, comprehensive examination is carried out before a hot asphalt bonding layer is spread, the surface is clean, and the next construction is carried out after the concrete panel is dry and pollution-free;
3) for the treatment of the concrete panel, a reporting and testing system is established, and construction of the next procedure can be carried out after the concrete panel is qualified through on-site supervision and acceptance;
4) and for the positions such as corners which cannot be processed by shot blasting, and the positions which are locally too large in depression or too thick in laitance and difficult to process, a hand-push type milling machine or a roughening machine and the like are used for assisting manual work to supplement processing.
5) And (4) cleaning the marked lines which cannot be treated by shot blasting by a professional marked line treatment team.
6) Attention is paid to the spreading amount of SBS hot asphalt and broken stone, so as to avoid the phenomena of wheel sticking and shifting in the process of paving and rolling the mixture caused by too much or too little spreading amount and uneven spreading.
(2) Sealing and bonding layer treatment
The pavement construction always emphasizes the 'inspection reporting system for sealing and adhering layer treatment', enters large-area construction, practically pays attention to interlayer treatment, and avoids the problem that interlayer adhesion effect is influenced because of no scattering or no cleaning.
Consulting and suggesting:
1) and after the sweeping vehicle is adopted for sweeping, the air blower is used for sweeping.
2) The hot asphalt macadam seal coat is required to be premixed and dedusted through a mixing station, and 3# hot bunker materials, namely 5-11 or 6-12 single specifications, are required to be adopted for the specification of stones, so that other hot bunker materials cannot be mixed for use.
3) Spreading hot asphalt macadam seal coat, wherein the spreading amount is controlled according to the lower limit in the design file; the spreading is uniform. Spreading hot asphalt macadam seal coat, wherein the spreading amount is large and the macadam is large; the hot asphalt macadam seal coat is spread, and the condition of uneven spreading exists; as shown in fig. 4.
The spreading of the hot asphalt macadam seal layer needs to control the spreading amount and the spreading uniformity.
(3) Points of construction attention
1) Spreading the mixture
And paving is carried out by adopting the combined operation of two pavers, and the distance between the front paver and the rear paver is kept to be 5-10 m. After the front spreading machine passes, the longitudinal seam of the spreading layer should be a slope, and the rear spreading machine should spread 5-10 cm across the seam.
The paving speed is determined according to the mixing capability, the matching condition of construction machinery, the paving thickness and the like, and is generally controlled within the range of 1.5-3.0 m/min if no special condition exists.
Consulting and suggesting:
firstly, when paving, the screed plate should adopt a medium-strength ramming grade, so that the initial compactness of the pavement is not less than 85%. The ironing plate of the paver must be spliced tightly without gaps, so that the pavement is prevented from being pulled out of streaks due to the fact that aggregates are clamped in the gaps.
And secondly, a spiral material distributor of the paver is added, and the distance between the spiral material distributor and the side baffle is reduced.
And thirdly, before the mixture is spread and not compacted, constructors cannot tread.
The paver should run at a slow and uniform speed to continuously pave.
And fifthly, the bottom layer of the asphalt mixture is preferably controlled by adopting a hanging line (or controlled by a towing rod), and the surface layer is preferably controlled by adopting a non-contact balance beam device to control the paving thickness.
2) Compacting of mixed materials
In order to ensure the compactness of the modified asphalt mixture, a horizontal vibration road roller or a high-frequency vibration road roller is adopted to roll the asphalt mixture. Wherein, neither the asphalt sand nor the SMA surface layer is rolled by a tyre roller.
When the SMA-10 is constructed, the warm mixing agent is added, but the discharging temperature of the mixture is unchanged, the mixing station is controlled according to the discharging temperature of the normal high-viscosity asphalt mixture, the compaction interval temperature of the SMA-10 mixture is greatly increased, and the compaction effect is obviously improved. The compaction effect is shown in figure 5.
Consulting and suggesting:
firstly, a road roller is usually closely followed by a paver, and the road roller is required to reduce water sprinkling quantity as much as possible and keep a reasonable compaction speed. Since the aggregate is easily over-crushed by vibration when the mixture is cooled to below 110 ℃, vibration rolling is not needed below 110 ℃.
Secondly, when high-viscosity asphalt is used, a warm-mixing agent is added, but the mixing and paving temperature of the mixture is not reduced, so that the effect of 'hot-mixing and warm-paving' is realized.
And thirdly, the steel wheel road roller does not need to stay on the road surface which is not compacted in real time, and stops on the compacted road surface as much as possible.
Fourthly, the steel wheel road roller is pressed in real time, and should not be rolled in a full range, so that the wheel tracks are eliminated as much as possible.
Fifthly, after the asphalt mixture road surface is compacted, the asphalt mixture road surface is naturally cooled, and after the temperature of the mixture surface is lower than 50 ℃, the traffic can be opened.
3) Performance detection
After construction is completed, the pavement is detected along with a master supervision unit and a construction unit, and indexes such as pavement evenness, anti-slip coefficient, structural depth and water seepage coefficient meet the requirements of design files.
Attention is paid to each link of paving continuity, initial compactness improvement and rolling combination, and flatness is detected in time after rolling is completed. The in-situ test is illustrated with reference to fig. 6.
Consulting and suggesting:
1) and the elevation control of the asphalt mortar construction adopts line hanging control. Under the condition of ensuring the paving thickness, the height of the suspension wire is adjusted according to the original actual measurement elevation of the pavement.
2) And performing corresponding treatment on the old pavement, controlling the elevation of the old pavement, performing local milling on the part with larger elevation difference, and controlling the flatness of the old pavement.
3) The method has the advantages that the paving continuity and stability are kept, the paving continuity and stability play a deterministic role in the flatness of the asphalt pavement, and the screed can also fall once the screed is stopped even if the elevation angle is in a locked state in the paving process, so that the flatness is influenced.
4) The rolling speed and the starting vibration of the steel wheel need to be strictly controlled in the rolling process, and the vibration rolling speed of the steel wheel is not more than 5km/h, namely not more than the normal walking speed of people; the starting and stopping of the vibratory roller are based on the principle of starting first, starting then, vibrating first, stopping vibrating first and stopping then, and the influence on the road surface flatness caused by sudden stopping is avoided.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A concrete pavement lifting structure, comprising:
the high-viscosity asphalt seal layer is arranged on the surface of the concrete pavement;
the high-viscosity asphalt mastic sand layer is arranged on the surface of the high-viscosity asphalt seal layer;
the warm mixing modified SMA-10 layer is arranged on the surface of the high-viscosity asphalt mastic sand layer; and
and the adhesive layer is arranged between the high-viscosity asphalt mastic sand layer and the warm-mixed modified SMA-10 layer and is used for bonding the high-viscosity asphalt mastic sand layer and the warm-mixed modified SMA-10 layer.
2. The concrete pavement lifting structure according to claim 1, wherein the thickness of the high-viscosity asphalt mastic sand layer is more than 2cm, and the thickness of the warm-mix modified SMA-10 layer is more than 3 cm.
3. The concrete pavement lifting structure according to claim 1, wherein the adhesive layer is a PCR modified emulsified asphalt adhesive layer.
4. The concrete pavement lifting structure according to claim 1, wherein the mass ratio of the solid raw materials in the warm-mix modified SMA-10 layer is as follows: 11-16mm particle size basalt: 5-11mm of basalt with the grain size: 0-4mm basalt: 55 parts of mineral powder: 13: 17-20: 12; the mass fraction of the asphalt in the warm-mixed modified SMA-10 layer is 6.2 percent of the mass of all basalt and mineral powder, and the porosity of the warm-mixed modified SMA-10 layer is 2.9-5.1 percent.
5. The concrete pavement lifting structure according to claim 1, wherein the mass ratio of the solid raw materials in the high-viscosity asphalt mastic sand layer is as follows: basalt with a particle size of 3-5 mm: 0-3mm particle size of basalt: the mineral powder is 55:34: 11; the mass fraction of the asphalt in the high-viscosity asphalt mastic sand layer is 7.1% of the mass of the high-viscosity asphalt mastic sand layer, and the porosity of the high-viscosity asphalt mastic sand layer is 2.1-2.6%.
6. A method of lifting a concrete slab having a lifting structure according to any one of claims 1 to 5, comprising:
treating the concrete pavement with crack diseases; if no crack is detected, performing shot blasting and bone exposing treatment on the concrete pavement;
paving a high-viscosity asphalt seal layer on the concrete pavement after the shot blasting and bone exposing treatment is carried out on the concrete pavement;
sequentially laying a high-viscosity asphalt mastic sand layer and a warm-mixing modified SMA-10 layer on the high-viscosity asphalt seal layer, spreading an adhesive layer between the high-viscosity asphalt mastic sand layer and the warm-mixing modified SMA-10 layer, re-marking after compacting, milling an asphalt concrete surface layer at the lap joint, and re-laying 1-2 layers of warm-mixing modified SMA-13.
7. The method of lifting a concrete slab of claim 6, wherein said exposing the concrete slab to shot blasting further comprises: cleaning a road surface; the thickness of the warm mixing modified SMA-13 is 4 cm.
8. The method for lifting a concrete pavement according to claim 6, wherein the shot blasting treatment is performed on the concrete pavement to expose bones; the method comprises the step of performing shot blasting bone exposure treatment on the concrete pavement so that the shot blasting bone exposure rate of the concrete pavement after the shot blasting bone exposure treatment is more than 30%.
9. The method for lifting a concrete pavement according to claim 6, wherein if the crack disease exists, the treatment is carried out; if no crack is damaged, paving a high-viscosity asphalt seal layer on the treated concrete pavement, wherein the steps of: if the crack is damaged and the crack width L is less than 3mm, sealing the crack by using a high-viscosity asphalt seal; if the cracks are damaged and the width L of the cracks is more than or equal to 3mm, adopting crack expanding grouting and pasting anti-crack paste treatment.
10. The method for lifting a concrete pavement according to claim 6, wherein the spreading amount of the high-viscosity modified asphalt is controlled to be 1.5-1.8kg/m when the high-viscosity asphalt seal is applied2The crushed stone is prepared by pre-mixing 5-10mm basalt with the spreading amount of the crushed stone meeting the full-paving rate of 50-60%;
the adhesive layer is made of PCR modified emulsified asphalt, the content of residues in the PCR modified emulsified asphalt is not less than 50%, and the dosage of the adhesive layer is 0.3-0.6L/m2；
The high-viscosity asphalt mastic sand layer is prepared from AC-5 high-viscosity asphalt mastic sand, in the preparation process, the asphalt heating temperature is controlled to be 185-plus 190 ℃, the mineral aggregate heating temperature is controlled to be 190-plus 195 ℃, the mixture mixing temperature after the asphalt and the mineral aggregate are mixed is controlled to be 185-plus 190 ℃, and the delivery temperature of the mixture is controlled to be 180-plus 185 ℃;
the warm-mix modified SMA-10 layer is prepared by a warm-mix process, and in the preparation process, the heating temperature of asphalt is 185 ℃; the heating temperature of the mineral aggregate is 190-200 ℃; the discharge temperature of the mixture after the asphalt and the mineral aggregate are mixed is controlled at 185 ℃.
In the preparation process of the warm-mixed modified SMA-13, the heating temperature of the asphalt is 160-165 ℃; the heating temperature of the mineral aggregate is 190-220 ℃; the discharge temperature of the mixture after the asphalt and the mineral aggregate are mixed is 170-185 ℃.
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| CN205617183U (en) * | 2015-11-18 | 2016-10-05 | 长安大学 | Novel thin layer top facing structure is joined in marriage to level of confidentiality |
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Application publication date: 20211119 |