CN103760039A - Evaluation method for influence on anti-shearing performance of waterproof adhesive layer paved on bridge floor caused by deicing salt - Google Patents
Evaluation method for influence on anti-shearing performance of waterproof adhesive layer paved on bridge floor caused by deicing salt Download PDFInfo
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- CN103760039A CN103760039A CN201410033247.3A CN201410033247A CN103760039A CN 103760039 A CN103760039 A CN 103760039A CN 201410033247 A CN201410033247 A CN 201410033247A CN 103760039 A CN103760039 A CN 103760039A
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Abstract
The invention discloses an evaluation method for influence on the anti-shearing performance of a waterproof adhesive layer paved on a bridge floor caused by deicing salt. The evaluation method comprises the steps of preparing a shearing compound test piece: taking out the test piece under room temperature, keeping the test piece in good condition for 28 days, and drying to obtain a cement concrete test piece with the design size of 300mm*300mm*50mm, performing starching treatment on the surface, smearing adhesive layer oil on the surface of the cement concrete test piece, paving a bridge floor pavement layer asphalt mixture according to a designed thickness, rolling to form the shearing compound test piece, cutting the shearing compound test piece into a ruled size, performing freeze thawing circulation test to enable one group of test pieces to be non vacuum waterlogged, immersing the other group of test pieces into 3.5% Nacl aqueous solution to enable the test pieces to be vacuum waterlogged, putting the vacuum waterlogged test pieces into a plastic bag, adding about 15mL of the 3.5% Nacl aqueous solution, freezing the test pieces at -18 DEG C for 16 hours, then immediately putting the test pieces into the 3.5% Nacl aqueous solution at the constant temperature of 45 DEG C for 24 hours, keeping the two groups of the test pieces under 45 DEG C for at least 2 hours, then performing shearing test, and calculating a lateral stiffness ratio (LSR) of the freeze thawing circulation, wherein the LSR is required to be larger than or equal to 85 percent. The evaluation method can really reflect the actual anti-shearing performance of the waterproof adhesive layer paved on the bridge floor.
Description
Technical field
The present invention relates to road engineering technical field, is exactly that deicer salts is to deck paving water-proof tack coat anti-shear performance impact assessment method.
Background technology
China's road construction cause is flourish at present, and along with the extension of mileages of transport route and the raising of grade, the road construction thing proportions such as bridge are increasing, become an important ring of national basis Facilities Construction.A large amount of viaduct wherein, large-scale, super-huge crossing bridge and pass through the mat formation structural shapes of layer of Paving Bituminous Concrete on cement concrete bridge deck plates that adopt such as city overpass around more.And this system earlier period damage phenomenon in building and using of mating formation is more prevalent and serious, be much because water-proof bond material selection is improper and construction quality causes.So water-proof tack coat plays an important role in the system of mating formation, the usability that guarantees water-proof tack coat is to improve the mat formation permanance of system and the key increasing the service life.
It is the typical damage form in deck paving damage layer type that the attachment function of cement concrete bridge deck asphalt concrete pavement layer is destroyed.The effect that the layer of mating formation not only bears vertical traffic load, the also effect of Under Lateral Loading, and the cohesive force of mating formation between layer and bridge floor is not enough, or inter-layer shearing strength is not enough, main manifestations is inter-laminar shear failure, can produce relative slippage, there is hole hole, crack, pass, gather around the diseases such as bag in the layer that causes mating formation.The severe impact of rear wheel that is open to traffic and the effect of load also easily make bridge floor occur loose, the disease such as peel off.Especially along with the increase of the volume of traffic and heavy vehicle, in automobile heavy-load overload situation, destroy even more serious, even, when deck paving, paver, lorry just likely glue water barrier walk, thus, water barrier does not have due effect, and water infiltrates and makes its anti-horizontal shear ability more weak from surface layer, and adhesive property is poorer, lose globality, thereby form a kind of vicious cycle state.
China is just at the early-stage to the research of bridge deck water-proof tack coat and experiment at present, its performance index and evaluation method are perfect not enough, also the testing regulations that does not have water-proof tack coat mechanical property to evaluate, about the aspects such as material selection, design, test, detection and construction of highway concrete bridge floor water-proof tack coat not yet form the unified standards and norms of system complete.Various waterproof materials on market are of a great variety, very different, the waterproof layer structure form of applying on bridge floor is also various, do not have unified material to select and quality control standards (QCS), the selection of water-proof tack coat for this reason, use have blindness, cannot operate according to different actual conditions, and theoretical and experience level falls behind, cause selection and the design of bridge deck water-proof tack coat improper, quality control on construction without ready patterns to follow.
China starts late for the research of deck paving aspect, relatively less for the data that is applicable to the concrete bridge deck asphalt pavement water-proof tack coat research of cold district.The cold district four seasons temperature difference is large, and freeze thawing circulation can not be underestimated the destruction of deck paving, roots out accumulated snow winter through conventional deicer salts (Nacl) simultaneously.Deicer salts road pavement has certain corrosive attack, easily destroys road surface.Cement concrete bridge deck asphalt concrete pavement is subject to seasonal temperature variation, freeze thawing circulation, deicer salts (Nacl) to affect also comparatively serious.Due to concrete bridge deck asphalt pavement water-proof tack coat, to deal with the deck paving disease problem causing improperly comparatively outstanding.
Summary of the invention
The object of the invention is for tar sand and modified bitumen sand water-proof tack coat, propose cold district deicer salts to deck paving water-proof tack coat anti-shear performance impact assessment method.For working out the testing regulations of bridge deck water-proof tack coat, provide reference, the aspects such as material selection, design, test, detection and construction for highway in cold region concrete bridge deck water-proof tack coat provide reference simultaneously.
Technical scheme of the present invention:
1. prepare cement concrete test specimen
2. composite samples is sheared in preparation
3. freezing and thawing test
4. shear test
5. calculate the freeze thawing anti-side ratio of rigidity LSR that circulates, require LSR >=85%
Anti-side rigidity LS=shearing/relative storey displacement (1)
In formula:
Peak load (KN) when shearing-tar sand or modified bitumen sand water-proof tack coat generation shear failure;
Interlayer maximum relative displacement (mm) when relative storey displacement-tar sand or modified bitumen sand water-proof tack coat generation shear failure.
In formula:
LSR-freeze thawing anti-side ratio of rigidity that circulates;
LS
drthe anti-side rigidity (KN/mm) of-freeze thawing circulation test specimen;
LS
0-anti-side the rigidity (KN/mm) of freeze thawing circulation test specimen not.
6. when 4 test specimen freeze thawing circulate the coefficient of variation of anti-side ratio of rigidity while being not more than 20%, get its mean value as test findings;
When the coefficient of variation is greater than 20%, should analyze reason, and supplementary test.
Advantage of the present invention is:
1. in < < highway engineering pitch and Asphalt Mixture Experiment rules > > JTJ052-2000, there is no shear test, in new order < < highway engineering pitch and Asphalt Mixture Experiment rules > > JTG E20-2011, although included shear strength of asphalt mixture test (three axle compression methods) in, not only operation easier is large, calculate numerous and diverse, and test findings is by shear strength parameter c,
value is calculated and is obtained.Application practice shows, dissimilar asphalt gained c,
value result difference is little, can not meet actual demands of engineering.Index proposed by the invention and standard have made up the deficiency of the existing < < of China highway engineering pitch and the test of Asphalt Mixture Experiment rules > > JTG E20-2011 asphalt mixture shearing and cutting performance evaluation index, use the shear behavior of this method Dui Han district deck paving water-proof tack coat to evaluate, the actual working state that can reflect more truly deck paving water-proof tack coat, meets requirement of engineering.
2. evaluation method proposed by the invention has been considered deicer salts and the impact of heavy duty on the anti-shear performance of deck paving water-proof tack coat.
3. the testing regulations for establishment bridge deck water-proof tack coat provides reference, and the aspects such as material selection, design, test, detection and construction for highway in cold region concrete bridge deck water-proof tack coat provide reference simultaneously.
Embodiment
The shear strength tester that first will be ready to use in the present invention, shear strength tester is widely used in the stretching of various types of materials, crooked, the test of the mechanical properties such as shearing is especially applicable to the industries such as electric wire and various metallic composite, paper, film, rubber, weaving, Aero-Space and carries out the test of tensile property index, powerful, low price.
One, shear strength tester principle of work
The machine adopts Electromechanical Design, mainly force cell, servo-driver, microprocessor, computing machine and color inkjet printer, consists of.High-precision servo varying-speed motor can arrange stepless test speed.Between each integration component, all adopt inserting mode to connect.Console mode type, moulding application has all taken into full account Contemporary Industrial Design, the correlation principle of ergonomics.
Two, shear strength tester abbreviated functional description
The omnidistance Control experiment overall process of computer, user can be by requirement separately, outputting standard report.By the overlay analysis to Group test curve, can accurately grasp quality, regulation and control parameter.Multimode data query function, can make the clear assurance quality control of supvr development tendency.Specially designed software function more can make experimenter quantitatively grasp the state parameter of key point in test material application process, accurately carries out technique adjustment and production control.
Three, shear strength tester basic function
Tensile test, compression test, 3 bending tests, shear test etc.
Four, shear strength tester software function brief introduction
1. loading, displacement curve, loading, time curve; Displacement, time curve; Stress, strain curve etc.
2. according to various countries, the requirement of sample is edited to corresponding testing standard, fill in test product data, editor's method of testing, and can supply test selection in the future.
3. this test findings of automatic storage, and can be compiled as report printing output, and can contrast a plurality of curves of having tested.
4. can set scale, each physical quantity unit and cryptoguard etc.
Five, shear strength tester basic operational steps:
Pilot project → arrange test parameters → starting characteristics test holding state → clamping test specimen → starting characteristics test → off-test self-return → transmission test figure → demonstration test findings and curve → test findings permanent storage → as required output test result and curve power on → select.
Six, shear strength tester the key technical indexes
Board loading: 50KN
Strength sensor capacity: 50KN
Capacity segmentation: Auto Rang, essence solution degree 1/300000.
Control system: computer is controlled data automatically, single-chip microcomputer and computer automatic data collection 50 points that reach per second.
The test space: test wide about 370mm, the yoke plate walking about 900mm in space
Safety feature: overload emergency stop device, upper and lower stroke limiting device, electric leakage auto-power-off system, automatic breakpoint halt function.
Accuracy rating: 1 grade
Loading precision: in ± 0.5%
Display resolution: 0.001N
Contractor selection: g/kg/N/KN
Fixture configuration: freely customize one pair of fixture according to consumer products demand
Display mode: windowsXP testing software+computer screen shows
Software function: in, English interface exchanges
Control mode: two formulas (host computer and micro computer display all can complete separately test)
Power system: AC motor
Screw mandrel: high precision gapless screw mandrel
Velocity range: 5-500mm/min
Use power supply: AC220V50Hz
Board size: main frame 90*55*180cm
Then implement according to the following steps the present invention
1. prepare cement concrete test specimen
Under room temperature state, take out health 28 days and the cement concrete plate shape test specimen of the design grade that dries, be of a size of (300mm ± 2mm) * (300mm ± 2mm) * (50mm ± 2mm), with scraper, the laitance of scored surface, dust are cleaned out.
2. composite samples is sheared in preparation
(1) cement concrete test specimen is smeared sticking layer oil and is placed in the die trial of rolling method moulding, by the existing < < of China highway engineering pitch and Asphalt Mixture Experiment rules > > (JTG E20-2011) the T0703 long 300mm of rolling forming machine roller-compaction, wide 300mm, the composite samples that thickness is identical with the design thickness of tar sand or modified bitumen sand, overlay bridge deck pavement asphalt thereon, roller-compaction is of a size of the combination shearing test specimen of (300mm ± 2mm) * (300mm ± 2mm) * (100mm ± 2mm), or the roller-compaction plate-like test specimen identical with the actual (real) thickness of deck paving.
Smear sticking layer oil consumption and can get 0.4L/m with reference to < < standard specification for construction and acceptance of highway asphalt pavement > > JTG F40-2004
2.
(2) this method is also applicable to adopt the plate-like test specimen of the moulding of rolling method and deck paving same structure and thickness, or the plate-like test specimen of on-site cutting, and the size of cutting sample is definite by testing according to the actual conditions of on-the-spot surface layer.
(3) after specimen molding, the time of placing under normal temperature condition together with die trial must not be less than 12h.To polymer modified asphalt compound, the time of placement is advisable with 48h, can test after polymer modified asphalt is fully solidified, and room temperature must not be longer than 1 week standing time.
(4) test specimen is the test specimen of (150mm ± 2mm) * (100mm ± 2mm) * (100mm ± 2mm) along rolling direction cut lengths, or according to test, need to cut into the size of requirement.Every plate cutting sample quantity is not less than 4.
3. freezing and thawing test
(1) one group of test specimen (being not less than 4) does not carry out the full water of vacuum, will another group test specimen (being not less than 4) immerse in 3.5% Nacl aqueous solution and carry out the full water (3.5%Nacl aqueous solution) of vacuum, recover normal pressure keep 15min under 98.3KPa～98.7KPa (730mmHg～740mmHg) vacuum condition after.
(2) in normal temperature 3.5%Nacl aqueous solution, soak after 2h, test specimen is put into polybag, add 15mL3.5%Nacl aqueous solution, test specimen freezes 16h ± 1h at-18 ℃ ± 2 ℃.
(3) test specimen is put into the 3.5%Nacl aqueous solution 24h of 45 ℃ ± 0.5 ℃ of constant temperature immediately.
(4) two groups of test specimens all under 45 ℃ ± 0.5 ℃ condition health be no less than 2h.Do not carry out the full water test specimen of vacuum and be no less than 2h in the Water Tank with Temp.-controlled of 45 ℃ ± 0.5 ℃, the 3.5%Nacl aqueous solution that another group test specimen is placed in 45 ℃ ± 0.5 ℃ of constant temperature is no less than 2h.
4. shear test
Two groups of test specimens adopt shearing equipment (as shear strength tester, direct shear apparatus etc.) to carry out shear test.Every group of shearing composite samples that is no less than 4 applied to normal direction (vertically) load 0.84MPa ± 0.05MPa, after normal load is stable, then apply level (tangentially) shearing force with the loading speed of 5mm/min, until test specimen generation shear fracture destroys.Record shear stress, strain and displacement.5. calculate the freeze thawing anti-side ratio of rigidity LSR that circulates, require LSR >=85%
Anti-side rigidity LS=shearing/relative storey displacement (1)
In formula:
Peak load (KN) when shearing-tar sand or modified bitumen sand water-proof tack coat generation shear failure;
Interlayer maximum relative displacement (mm) when relative storey displacement-tar sand or modified bitumen sand water-proof tack coat generation shear failure.
In formula:
LSR-freeze thawing anti-side ratio of rigidity that circulates;
LS
drthe anti-side rigidity (KN/mm) of-freeze thawing circulation test specimen;
LS
0-anti-side the rigidity (KN/mm) of freeze thawing circulation test specimen not.
6. when 4 test specimen freeze thawing circulate the coefficient of variation of anti-side ratio of rigidity while being not more than 20%, get its mean value as test findings; When the coefficient of variation is greater than 20%, should analyze reason, and supplementary test.
(2) step in ★ freezing and thawing test, the T0729 with reference to < < highway engineering pitch and Asphalt Mixture Experiment rules > > JTG E20-2011, why add about 15mL water, rather than about 10mL water, be to consider that sample dimensions increases to some extent, by the amount of water of identical asphalt mixture volume, convert and obtain.
In ★ shear test, applying normal direction (vertically) load 0.84MPa ± 0.05MPa, is to consider that the situation that Modern road traffic generally overloads is comparatively serious, the doughnut ground connection pressure when overload 150%.Also can determine according to actual overload situation.Loading velocity 5mm/min determines with reference to < < highway engineering pitch and Asphalt Mixture Experiment rules > > JTG E20-2011 shear strength of asphalt mixture test (three axle compression methods).
★ shears in composite samples a little less than water-proof tack coat relative thin, therefore general first along water-proof tack coat generation shear failure in shear test.
Claims (1)
1. deicer salts is to tar sand and modified bitumen sand deck paving water-proof tack coat anti-shear performance impact assessment method, it is characterized in that: (a) prepare cement concrete test specimen, under room temperature state, the cement concrete rectangular parallelepiped test block of the design grade that takes out health 28 days and dry, be of a size of 300mm ± 2mm * 300mm ± 2mm * 50mm ± 2mm, with scraper, the laitance of scored surface, dust cleaned out, (b) composite samples is sheared in preparation: 1. cement concrete test specimen is smeared sticking layer oil and is placed in the die trial of rolling method moulding, by the existing < < of China highway engineering pitch and the Asphalt Mixture Experiment rules > > JTG E20-2011T0703 long 300mm of rolling forming machine roller-compaction, wide 300mm, the composite samples that thickness is identical with the design thickness of tar sand or modified bitumen sand, overlay bridge deck pavement asphalt thereon, roller-compaction is of a size of the combination shearing test specimen of 300mm ± 2mm * 300mm ± 2mm * 100mm ± 2mm, or the roller-compaction plate-like test specimen identical with the actual (real) thickness of deck paving, smear sticking layer oil consumption and can get 0.4L/m with reference to < < standard specification for construction and acceptance of highway asphalt pavement > > JTG F40-2004
2, 2. this method is also applicable to adopt the plate-like test specimen of the moulding of rolling method and deck paving same structure and thickness, or the plate-like test specimen of on-site cutting, and the size of cutting sample is definite by testing according to the actual conditions of on-the-spot surface layer, 3. after specimen molding, the time of placing under normal temperature condition together with die trial must not be less than 12h, and to polymer modified asphalt compound, the time of placement is advisable with 48h, after polymer modified asphalt is fully solidified, can test, room temperature must not be longer than 1 week standing time, 4. the test specimen that test specimen is 150mm ± 2mm * 100mm ± 2mm * 100mm ± 2mm along rolling direction cut lengths, or according to testing the size that need to cut into requirement, every plate cutting sample quantity is not less than 4, (c) carry out freezing and thawing test: 1. one group is not less than the not full water of vacuum of 4 test specimens, another group is not less than to 4 test specimens and immerses in 3.5% Nacl aqueous solution and carry out the full water of vacuum, recover normal pressure keep 15min under 98.3KPa～98.7KPa vacuum condition after, 2. in normal temperature 3.5%Nacl aqueous solution, soak after 2h, test specimen is put into polybag, add about 15mL3.5%Nacl aqueous solution, test specimen freezes 16h ± 1h at-18 ℃ ± 2 ℃, 3. test specimen is put into the 3.5%Nacl aqueous solution 24h of 45 ℃ ± 0.5 ℃ of constant temperature immediately, 4. two groups of test specimens all under 45 ℃ ± 0.5 ℃ condition health be no less than 2h, do not carry out the full water test specimen of vacuum and be no less than 2h in the Water Tank with Temp.-controlled of 45 ℃ ± 0.5 ℃, the 3.5%Nacl aqueous solution that another group test specimen is placed in 45 ℃ ± 0.5 ℃ of constant temperature is no less than 2h, (d) carry out shear test, two groups of test specimens adopt the shearing equipments such as shear strength tester to carry out shear test, every group of shearing composite samples that is no less than 4 applied to normal direction vertical load 0.84MPa ± 0.05MPa, after normal load is stable, loading velocity with 5mm/min applies horizontal tangential shearing force again, until test specimen generation shear fracture destroys, record shear stress, strain and displacement, (e) calculate the freeze thawing anti-side ratio of rigidity LSR that circulates, require LSR>=85%, anti-side rigidity LS=
shearing/ relative storey displacement (1)
In formula:
Peak load (KN) when shearing-tar sand or modified bitumen sand water-proof tack coat generation shear failure;
Interlayer maximum relative displacement (mm) when relative storey displacement-tar sand or modified bitumen sand water-proof tack coat generation shear failure,
In formula:
LSR-freeze thawing anti-side ratio of rigidity that circulates;
LS
drthe anti-side rigidity (KN/mm) of-freeze thawing circulation test specimen;
LS
0-anti-side the rigidity (KN/mm) of freeze thawing circulation test specimen not;
(f) when 4 test specimen freeze thawing circulate the coefficient of variation of anti-side ratio of rigidity while being not more than 20%, get its mean value as test findings; When the coefficient of variation is greater than 20%, answer supplementary test.
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Cited By (4)
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| CN107255597A (en) * | 2017-05-31 | 2017-10-17 | 北京建筑大学 | A kind of test method for evaluating cement-based waterproof tack coat freezing and thawing performance |
| CN110927198A (en) * | 2019-11-01 | 2020-03-27 | 中路高科(北京)公路技术有限公司 | Freeze-thaw cycle test method and frost resistance evaluation method for porous cement stabilized macadam |
| CN112268815A (en) * | 2020-09-02 | 2021-01-26 | 西安理工大学 | Test method for ice pulling force of concrete dam in cold region |
| CN111650073B (en) * | 2020-06-15 | 2024-02-13 | 河北工业大学 | Method for testing snow and ice melting capability of phase-change asphalt mixture |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107255597A (en) * | 2017-05-31 | 2017-10-17 | 北京建筑大学 | A kind of test method for evaluating cement-based waterproof tack coat freezing and thawing performance |
| CN110927198A (en) * | 2019-11-01 | 2020-03-27 | 中路高科(北京)公路技术有限公司 | Freeze-thaw cycle test method and frost resistance evaluation method for porous cement stabilized macadam |
| CN111650073B (en) * | 2020-06-15 | 2024-02-13 | 河北工业大学 | Method for testing snow and ice melting capability of phase-change asphalt mixture |
| CN112268815A (en) * | 2020-09-02 | 2021-01-26 | 西安理工大学 | Test method for ice pulling force of concrete dam in cold region |
| CN112268815B (en) * | 2020-09-02 | 2023-10-27 | 西安理工大学 | Test method for ice pulling force of concrete dam in cold area |
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Application publication date: 20140430 |