CN114382055B - Asphalt concrete sliding joint structure and construction process - Google Patents
Asphalt concrete sliding joint structure and construction process Download PDFInfo
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- CN114382055B CN114382055B CN202210173993.7A CN202210173993A CN114382055B CN 114382055 B CN114382055 B CN 114382055B CN 202210173993 A CN202210173993 A CN 202210173993A CN 114382055 B CN114382055 B CN 114382055B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/06—Unsaturated polyesters
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Materials Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses an asphalt concrete sliding joint structure which comprises an asphalt concrete layer and a waterproof film layer, wherein the waterproof film layer is covered on the asphalt concrete layer, an asphalt mastic layer is covered outside the waterproof film layer, an asphalt mortar layer is covered outside the asphalt mastic layer, and a resin anchoring layer is arranged between the asphalt mastic layer and the asphalt concrete layer. According to the invention, the geomembrane is arranged between the asphalt concrete and the asphalt mortar layer, and the asphalt mastic layer and the resin anchoring layer are coated outside the geomembrane, so that the bonding strength can be ensured, the waterproof performance is good, and the anti-seepage requirement of the sliding joint can be met.
Description
Technical Field
The invention relates to the technical field of asphalt concrete, in particular to an asphalt concrete sliding joint structure and a construction process.
Background
With the development of water conservancy and hydropower industry, particularly the development of the plan for the medium-long-term development of pumped storage (2021-2035) issued by the national energy agency, the construction of a pumped storage power station will come to a stage of high-speed development, and the proportion of the type of the seepage-proofing structure adopting the full-reservoir asphalt panel will be further increased. For an asphalt concrete panel anti-seepage system, the joint of the asphalt concrete panel and a common concrete rigid structure is a weak part in the whole panel anti-seepage system. In established engineering, problems are often found at the joints, causing leakage. Related experimental researches show that the joint part adopts a sliding joint mode, and the uneven displacement between the asphalt concrete and the rigid concrete is adapted by releasing the direct constraint function of the asphalt concrete and the rigid concrete, so that the tensile stress and the tensile strain of the panel can be effectively reduced, the panel slides under the lower tensile stress and the tensile strain state, and the panel can be prevented from cracking and leaking.
Along with the improvement of construction technology, the anti-seepage application of the geomembrane in the anti-seepage system tends to be mature, and the anti-seepage effect can be well achieved. However, the geomembrane is significantly less strong, the asphalt concrete panels are unevenly displaced, and the geomembrane is difficult to anchor. Therefore, the adhesion of geomembranes throughout the slip joint structural system is still under continuous investigation.
Disclosure of Invention
The invention aims to provide an asphalt concrete sliding joint structure and a construction process.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the utility model provides an asphalt concrete sliding joint structure, includes asphalt concrete layer and waterproof membrane layer, and waterproof membrane layer covers on asphalt concrete layer, and waterproof membrane layer covers outward has the pitch mastic layer, and the pitch mastic layer covers outward has the pitch mortar layer.
Preferably, a resin anchoring layer is arranged between the asphalt mastic layer and the asphalt concrete layer.
Preferably, the waterproof membrane layer is composed of two geotextiles and a PE membrane, and the PE membrane is arranged between the two geotextiles.
Preferably, the chemical components of the resin anchoring layer comprise the following components in percentage by weight: 36 to 40 percent of 196 unsaturated polyester resin, 20 to 30 percent of SR water-soluble unsaturated polyester resin, 15 to 20 percent of benzoyl peroxide, 5 to 10 percent of BPO curing agent and 2 to 5 percent of PAPI cross-linking agent.
Preferably, the asphalt concrete layer is composed of modified asphalt and acid aggregate according to weight 3: 7.
Preferably, glass fiber and KTWH structural adhesive are added in the concrete layer, and the weight ratio of the glass fiber to the acidic aggregate is 1:200, the weight ratio of KTWH structural adhesive to modified asphalt is 2:50.
the construction process of the asphalt concrete sliding joint structure comprises the following steps:
s1, arranging PE films with the same size between two geotextiles to form a waterproof film layer;
s2, preparing an asphalt concrete layer;
s3, coating the resin anchoring paint and the asphalt mastic on the surface of the waterproof membrane layer at the temperature of 150-170 ℃ with the coating thickness of 4mm, and then covering the waterproof membrane layer on the asphalt concrete layer;
s4, repeating the steps to smear the asphalt mastic, smearing for 2mm again, and uniformly paving the mixed asphalt mortar on the asphalt mastic after the asphalt mastic is cooled to room temperature.
Preferably, the specific steps of the step S2 are as follows: mixing the modified asphalt and mineral powder according to a proportion to prepare an asphalt concrete layer, and tamping.
Compared with the prior art, the invention has the advantages that:
according to the invention, the geomembrane is arranged between the asphalt concrete and the asphalt mortar layer, and the asphalt mastic layer and the resin anchoring layer are coated outside the geomembrane, so that the bonding strength can be ensured, the waterproof performance is good, and the anti-seepage requirement of the sliding joint can be met.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of an asphalt concrete slip joint according to the present invention;
FIG. 2 is a graph of pressure test data for test pieces of the first and second embodiments of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, the patentees may make various modifications or alterations within the scope of the appended claims, and are intended to be within the scope of the invention as described in the claims.
Referring to fig. 1, an asphalt concrete sliding joint structure comprises an asphalt concrete layer and a waterproof membrane layer, wherein the waterproof membrane layer is covered on the asphalt concrete layer, an asphalt mastic layer is covered outside the waterproof membrane layer, and an asphalt mortar layer is covered outside the asphalt mastic layer.
In this embodiment, a resin anchoring layer is provided between the mastic asphalt layer and the asphalt concrete layer.
In this embodiment, the waterproof membrane layer is composed of two geotextiles and a PE membrane, and the PE membrane is disposed between the geotextiles.
In this embodiment, the chemical components of the resin anchoring layer include, by weight: 36-40% of 196 unsaturated polyester resin, 20-30% of SR water-soluble unsaturated polyester resin, 15-20% of benzoyl peroxide, 5-10% of BPO curing agent and 2-5% of PAPI cross-linking agent, and the materials are mixed and smeared on an asphalt concrete layer, so that the binding force between geotextile and the asphalt concrete layer can be improved, the water resistance, acid and alkali resistance, salt resistance, fatigue resistance and ageing resistance of the asphalt concrete layer are improved, and the shearing strength of the asphalt concrete layer can be improved by adding the PAPI cross-linking agent.
In this embodiment, glass fiber and KTWH structural adhesive are added in the concrete layer, and the weight ratio of glass fiber to acid aggregate is 1:200, the weight ratio of KTWH structural adhesive to modified asphalt is 2:50; KTWH structural adhesive is purchased in a outsourcing form, and can be added into modified asphalt to increase the solidification speed, hardness and strength of the modified asphalt.
Firstly, adopting asphalt mortar for sealing;
coating the stirred asphalt mastic and resin anchoring paint on an asphalt concrete mechanical property test piece, wherein the coating temperature is 150-170 ℃, the coating thickness is 2mm, the coating process is required to be rapidly and uniformly coated, and the cut geomembrane is required to be rapidly covered on the asphalt mastic after the coating is finished so as to ensure the adhesion of the geomembrane and the asphalt concrete;
repeating the above test steps on the surface of the covered geomembrane to smear the surface layer asphalt water chestnut grease, after the asphalt water chestnut grease is cooled to room temperature, uniformly paving the mixed asphalt mortar on the asphalt water chestnut grease, wherein the paving thickness is 1.5cm, and the paving temperature is about 180 ℃ to achieve the sealing effect;
after the test is finished, the test piece is cooled to normal temperature.
In the second embodiment, an impermeable layer of asphalt concrete is adopted for sealing;
coating the stirred asphalt mastic and resin anchoring paint on an asphalt concrete mechanical property test piece, wherein the coating temperature is 150-170 ℃, the coating thickness is 2mm, the coating process is required to be rapidly and uniformly coated, and the cut geomembrane is required to be rapidly covered on the asphalt mastic after the coating is finished so as to ensure the adhesion of the geomembrane and the asphalt concrete;
repeating the above test steps on the surface of the covered geomembrane to smear the surface layer asphalt water chestnut grease, after the asphalt water chestnut grease is cooled to room temperature, uniformly paving the mixed asphalt mortar on the asphalt water chestnut grease, wherein the paving thickness is 1.5cm, and the paving temperature is about 180 ℃ to achieve the sealing effect;
after the test is finished, the test piece is cooled to normal temperature.
And after the test piece is cooled, respectively vertically lifting one ends of the two test piece joints, and observing the bonding condition of the geomembrane joint.
By modifying the test piece, the rupture force of the geomembrane is accurately measured on the steel bar tensile test equipment, and in two tensile tests, when the tensile force reaches 11kN, the geomembrane is ruptured, the joint part does not have obvious change, so that the binding force of the geomembrane and the asphalt concrete is proved to be greater than the strength of the geomembrane.
The test phenomenon shows that the gravity caused by the self weight of the test piece is far below the critical value because no obvious sign of falling exists. Indicating extremely strong adhesion. Because the contact point of the geomembrane and the test piece is not in the center, the gravity center of the stress is not the gravity center of the test piece, and the effective stress area is smaller than the calculated stress area. As shown in fig. 2, the actual pressure to which it is subjected should be greater than the calculated pressure.
Claims (6)
1. An asphalt concrete slip joint structure, its characterized in that: the waterproof membrane layer is covered on the asphalt concrete layer, the asphalt mastic layer is covered outside the waterproof membrane layer, the asphalt mortar layer is covered outside the asphalt mastic layer, a resin anchoring layer is arranged between the asphalt mastic layer and the asphalt concrete layer, the waterproof membrane layer is composed of two geotextiles and a PE membrane, and the PE membrane is arranged between the two geotextiles.
2. An asphalt concrete slip joint structure according to claim 1, wherein: the resin anchoring layer comprises the following chemical components in percentage by weight: 36-40% of 196 unsaturated polyester resin, 20-30% of SR water-soluble unsaturated polyester resin, 15-20% of benzoyl peroxide, 5-10% of BPO curing agent and 2-5% of PAPI cross-linking agent.
3. An asphalt concrete slip joint structure according to claim 1, wherein: the asphalt concrete layer is prepared from modified asphalt and acid aggregate according to the weight of 3: 7.
4. An asphalt concrete slip joint structure according to claim 1, wherein: glass fiber and KTWH structural adhesive are added into the concrete layer, and the weight ratio of the glass fiber to the acid aggregate is 1:200, the weight ratio of KTWH structural adhesive to modified asphalt is 2:50.
5. a construction process of an asphalt concrete slip joint structure according to any one of claims 1 to 4, comprising the steps of:
s1, arranging PE films with the same size between two geotextiles to form a waterproof film layer;
s2, preparing an asphalt concrete layer;
s3, coating the resin anchoring paint and the asphalt mastic on the surface of the waterproof membrane layer at 150-170 ℃ with the coating thickness of 4mm, and then covering the waterproof membrane layer on the asphalt concrete layer;
s4, repeating the steps to smear the asphalt mastic, smearing for 2mm again, and uniformly paving the mixed asphalt mortar on the asphalt mastic after the asphalt mastic is cooled to room temperature.
6. The construction process of the asphalt concrete slip joint structure according to claim 5, wherein: the specific steps of the step S2 are as follows: mixing the modified asphalt and mineral powder according to a proportion to prepare an asphalt concrete layer, and tamping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210173993.7A CN114382055B (en) | 2022-02-24 | 2022-02-24 | Asphalt concrete sliding joint structure and construction process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210173993.7A CN114382055B (en) | 2022-02-24 | 2022-02-24 | Asphalt concrete sliding joint structure and construction process |
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| Publication Number | Publication Date |
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| CN114382055A CN114382055A (en) | 2022-04-22 |
| CN114382055B true CN114382055B (en) | 2023-06-02 |
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| CN202210173993.7A Active CN114382055B (en) | 2022-02-24 | 2022-02-24 | Asphalt concrete sliding joint structure and construction process |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3214760B2 (en) * | 1993-07-23 | 2001-10-02 | 三井化学株式会社 | Breathable waterproof construction for heavy walking |
| CN102912970A (en) * | 2012-11-13 | 2013-02-06 | 大连顺发建筑防水技术有限公司 | Building waterproof membrane |
| CN105625271A (en) * | 2015-12-31 | 2016-06-01 | 国家电网公司 | Method for repairing water stop of vertical joint of rock-fill dam concrete face slab |
| CN214782984U (en) * | 2021-01-15 | 2021-11-19 | 深圳市零五建筑工程有限公司 | Road repairing structure of sponge city |
| CN112982300B (en) * | 2021-02-01 | 2022-06-14 | 中国电建集团华东勘测设计研究院有限公司 | Seepage-proofing and drainage connecting structure for bank asphalt concrete panel and reservoir bottom geomembrane and construction method |
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