CN107255597A - A kind of test method for evaluating cement-based waterproof tack coat freezing and thawing performance - Google Patents
A kind of test method for evaluating cement-based waterproof tack coat freezing and thawing performance Download PDFInfo
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- CN107255597A CN107255597A CN201710401301.9A CN201710401301A CN107255597A CN 107255597 A CN107255597 A CN 107255597A CN 201710401301 A CN201710401301 A CN 201710401301A CN 107255597 A CN107255597 A CN 107255597A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
Abstract
The present invention relates to a kind of test method for evaluating cement-based waterproof tack coat freezing and thawing performance, comprise the following steps：1 coagulating cement soil block is moistened with acrylic emulsions；2 smear cement-based material；3 will smear the coagulating cement soil block room temperature of cement-based material；4 overlay asphalt when cement-based material pre-hardening state；5 will complete the cement concrete composite samples normal temperature health of asphalt；The good cement concrete composite samples of health are cut into shear test block and pull-out experiment by 6；Shear test block and pull-out experiment are respectively put into freeze thawing in rubber experiment box by 7；Test specimen is placed on holding in water by 8；The shear strength and pull strength of test specimen after 9 sequentially determinings difference freezing-thawing cycles；10 determine the most suitable method for evaluating cement-based waterproof bonding layer material freezing and thawing performance.The present invention can instruct concrete application of the cement-based waterproof bonding layer material in cement concrete bridge deck, and a kind of applicable test method is provided can fully to evaluate its freezing and thawing performance.
Description
Technical field
The invention belongs to building material field, it is related to a kind of experiment side for evaluating cement-based waterproof tack coat freezing and thawing performance
Method.
Background technology
At present, cement concrete bridge deck water-proof binding layer material is mainly pitch class and special-purpose water-proof class material, most of
Researcher is to evaluate the freeze-thaw resistance of these organic waterproof bonding layer materials using the freeze thawing mode of simulation asphalt
Energy.And cement base is as a kind of novel inorganic water-proof binding layer material, it has shearing strength is high, water influence is small, waterproof is strong etc.
Advantage, is difficult to evaluate its freezing and thawing performance using the freeze thawing mode of asphalt.It is therefore desirable to develop a kind of evaluation water
The test method of mud base water-proof bond material freezing and thawing performance.
Wang Wei selects common emulsified asphalt, EVA modified emulsifying asphalts, SBR modified emulsifying asphalts, SBS modified emulsifying asphalts
As water-proof binding layer material, 24h is soaked using test specimen is placed in 25 DEG C of ± 0.5 DEG C of constant temperature water tanks, after fully full water, is placed
In -10 DEG C of ± 0.5 DEG C of constant temperature refrigerators after 16h take out, be placed at 25 DEG C ± 0.5 DEG C melt 12h after sheared, drawing try
Test.Result of the test finds that freeze thawing influences obvious to inter-layer shearing strength, the shearing strength of four kinds of binding materials and drawing after freeze thawing
Intensity, which has, largely to be declined, and SBS modified emulsifying asphalt freezing-thawing resistances are best.
Liu Conghui selects AH-90 matrix pitches, SBR modified pitch, rubber asphalt as water-proof binding layer material, using drip
The freezing-thawing test method of blue or green compound, test specimen keeps being immediately placed in 25 DEG C ± 0.5 DEG C after 16 ± 1h in -18 ± 2 DEG C of refrigerator
24h is incubated in water-bath, shearing test is carried out to the test specimen of different freezing-thawing cycles (0-5 times).It was found that, rubber asphalt tack coat
Influenceed smaller by the infringement of freeze thawing recirculated water.
Wang Duxi from waterproof roll, SBS modified pitch, AMP-100 as water-proof binding layer material, using 25 DEG C ±
Soak 4h at 0.5 DEG C, is put into 24h in -18 DEG C of ± 0.5 DEG C of refrigerators, referred to as one circulation, undergoes after 4 circulations, be put into 60 DEG C ±
5h is conserved in 0.5 DEG C of environmental cabinet, shearing test is carried out.It was found that, waterproof roll and thermal jet SBS modified asphalt waterproof tack coats subtract
Maximum by a small margin, AMP-100 water-proof tack coats show good freeze thawing resistance cycle performance, reduce amplitude 4% or so.
Ten thousand morning twilight etc. are used as water-proof binding layer material from 4.5%SBS modified pitch synchronous breakstone.It was found that, with temperature
Rise, structural shear strength and adhesion strength significantly reduced, and minimum, explanation is issued in 40 DEG C of ± 0.5 DEG C of water bath conditions
Water has considerable influence to SBS modified pitch synchronous breakstone water-proof binding layer materials.
Wear and just wait from bituminous epoxy as water-proof binding layer material, determine that epoxy is dripped by shearing test and pull-out test
Blue or green spread quantity is 0.70L/m2, and it was found that after cement concrete bridge deck bituminous epoxy is as water-proof binding layer material spread
Its curing time must strictly be controlled in 24-32h.
Liu Liping etc. coheres waterproof coating conduct from SBS modified pitch, cement-base waterproof coating, AWP-2000 bridge floors
Water-proof binding layer material.It was found that, AWP-2000 shear behavior is more prominent, and its shear behavior of cement-base waterproof coating is poor；
During 35 DEG C of temperature ＜, the shearing strength of SBS emulsified asphalts+small crushed stone slightly has shortcoming, during temperature >=35 DEG C, and AWP-2000 bridge floors are sticked
The shearing strength and bond strength of this 2 kinds of materials of knot waterproof coating Yu SBS modified emulsifying asphalts+small crushed stone are satisfied by specification will
Ask.
Sun Lingli etc. selects SBS modified pitch, SBR modified emulsifying asphalts, neoprene complex class water-repellent paint as anti-
Water bonding layer material.It was found that, the inter-layer shearing strength and pull strength of three kinds of water-proof binding layer materials are with the rise of temperature
Gradually reduce, the shearing strength of neoprene complex class water-repellent paint is 1.85 times of SBS polymer modified pitch under same temperature,
It is 2.52 times of SBR modified emulsifying asphalts, is 9.38 times of adhesive-less layer；The combination drawing of neoprene complex class water-repellent paint is strong
Degree is better than SBS polymer modified pitch, better than SBR modified emulsifying asphalts；
In water-proof binding layer material selecting party face, researcher's general choice pitch class and special-purpose waterproof bonding layer class material,
Almost without reference to inorganic water-proof bonding layer material.In the freeze thawing resistance effect for evaluating water-proof binding layer material, researcher is main
It is simulation asphalt freeze thawing mode, the one Frozen-thawed cycled time is long, cycle-index is very few (being circulated substantially at 0-5).
And cement base, as a kind of novel inorganic water-proof binding layer material, multiple Frozen-thawed cycleds should be carried out by evaluating its freeze thawing resistance effect, because
This, it is necessary to developing a kind of can fully evaluate the test method of cement-based waterproof bonding layer material freeze thawing resistance effect.
The content of the invention
In order to overcome the deficiencies in the prior art, the present invention is provided.
The invention provides following technical scheme：
A kind of cement-based waterproof bonding layer material freezing-thawing test method, comprises the following steps：
Step one：Moistened on prefabricated coagulating cement soil block with acrylic emulsions, normal temperature is stood；
Step 2：Cement-based material is smeared on the coagulating cement soil block moistened, is struck off with cement flexible spatulas；
Step 3：The coagulating cement soil block room temperature of cement-based material will be smeared；
Step 4：Asphalt is overlayed when cement-based material pre-hardening state；
Step 5：The cement concrete composite samples normal temperature health of asphalt will be completed；
Step 6：The good cement concrete composite samples of health are cut into shear test block and pull-out experiment, and use ring
Oxygen tree fat is stained with drawing head；
Step 7：Shear test block and pull-out experiment are respectively put into rubber experiment box, drinking water is added, is put into refrigerator
Test specimen after freezing, is then put into water and melts, be now 1 Frozen-thawed cycled by freezing；
Step 8：Before shearing test and pull-out test is carried out, test specimen is placed in water and kept；
Step 9：The shear strength and pull strength of test specimen after sequentially determining difference freezing-thawing cycles；
Step 10：By the shear strength and pull strength changing rule of different freezing-thawing cycles test specimens, it is determined that most suitable
Close the method for evaluating cement-based waterproof bonding layer material freezing and thawing performance.
In step 2, the cement base is by certain ratio by portland cement, Machine-made Sand, acrylic emulsion, water, additive
Example composition.Selected cement-based material will meet waterproof and adhesive property, can be applied to cement concrete bridge deck waterproof and glue
Tie in layer；In step 4, asphalt is mixed and stirred and formed under certain condition by mineral aggregate with asphalt binder.Main basis
The type of the selection asphalt such as the grade and function of road, the volume of traffic, load.Can be by commercially available according to service condition
Buy or rule of thumb match somebody with somebody.
In such scheme preferably, in step one, moistened on coagulating cement soil block with acrylic emulsions, consumption is
100~300g/m2。
In any of the above-described scheme preferably, in step one, the coagulating cement soil block after being moistened with acrylic emulsions
Normal temperature stands 3~5min.
In any of the above-described scheme preferably, in step 2, cement base thickness control is in 3~5mm.
In any of the above-described scheme preferably, in step 3, the coagulating cement soil block normal temperature for smearing cement-based material is put
Set to 0 .5h.
In any of the above-described scheme preferably, in step 5, the cement concrete composite samples of asphalt are completed
Normal temperature health 14d.
In any of the above-described scheme preferably, in step 6, cement concrete composite samples cut into 100mm ×
100mm × 100mm shear test block.
In any of the above-described scheme preferably, in step 6, cement concrete composite samples cut into pave-load layer 50mm
× 50mm × 50mm+ cement concretes flaggy 70mm × 70mm × 50mm pull-out experiment.
In any of the above-described scheme preferably, in step 7, shear test block and pull-out experiment are put into from 20 respectively
Freezed in rubber experiment box.
In any of the above-described scheme preferably, added in step 7, in rubber experiment box and drink water not have it
Test specimen top surface 1mm~3mm.
In any of the above-described scheme preferably, in step 7, the temperature control of test specimen freezing is at -18 DEG C ± 2 DEG C.
In any of the above-described scheme preferably, in step 7, the time of test specimen freezing is 4h.
In any of the above-described scheme preferably, in step 7, freeze thawing conversion time is in 10min.
In any of the above-described scheme preferably, in step 7, the water temperature of melting chilling test specimen is controlled at 60 DEG C ± 0.5
℃。
In any of the above-described scheme preferably, in step 7, the time of test specimen melting chilling is 1h.
In any of the above-described scheme preferably, in step 8, before shearing and pull-out test, test specimen is at 25 DEG C ± 0.5 DEG C
The retention time is 2h in water.
In any of the above-described scheme preferably, in step 9, cycle-index is 0,5,10,15,20 and 25 times.
The present invention can instruct concrete application of the cement-based waterproof bonding layer material in cement concrete bridge deck, and be
Its freezing and thawing performance can fully be evaluated a kind of applicable test method is provided.Therefore, technical solution of the present invention has obvious
Economic and social benefit.
Brief description of the drawings
Fig. 1 is a kind of one being preferable to carry out for the test method of evaluation cement-based waterproof tack coat freezing and thawing performance of the present invention
The shear strength of different freezing-thawing cycles test specimens in example；
Fig. 2 is the pull strength of different freezing-thawing cycles test specimens in embodiment illustrated in fig. 1.
Embodiment
In order to further appreciate that the technical characteristic of the present invention, the present invention is explained in detail with reference to specific embodiment
State.Embodiment only has exemplary effect to the present invention, without any restricted effect, those skilled in the art
The modification for any unsubstantiality made on the basis of the present invention, should all belong to protection scope of the present invention.
Embodiment 1：
A kind of test method for evaluating cement-based waterproof tack coat freezing and thawing performance, comprises the following steps：
1) moistened on prefabricated 300mm × 300mm × 50mm C40 coagulating cement soil blocks with acrylic emulsion, consumption
For 200g/m2, normal temperature standing 5min；
2) cement-based material is smeared on the coagulating cement soil block moistened, is struck off with cement flexible spatulas, thickness control exists
4mm；The cement base is made up of by a certain percentage portland cement, Machine-made Sand, acrylic emulsion, water, additive.
3) the coagulating cement soil block room temperature 0.5h of cement-based material will be smeared；
4) AC-13 type asphalts are overlayed when cement-based material pre-hardening state；
5) the cement concrete composite samples normal temperature health 14d of asphalt will be completed；
6) the good cement concrete composite samples of health are cut into 100mm × 100mm × 100mm shear test block, and
Pave-load layer 50mm × 50mm × 50mm+ cement concretes flaggy 70mm × 70mm × 50mm pull-out experiment, and use asphalt mixtures modified by epoxy resin
Fat is stained with drawing head；
7) 20 shear test blocks and 20 pull-out experiments are respectively put into rubber experiment box, add drinking water, do not have it
Test specimen top surface 2mm is crossed, then freezes in -18 DEG C of refrigerators 4h；The test specimen freezed after 4h is put into 60 DEG C of water in 10min and melted
1h；
8) before shearing test and pull-out test is carried out, test specimen is kept into 2h in 25 DEG C of water；
9) the different freezing-thawing cycles of sequentially determining (0,5,10,15,20,25 times) shear strength of test specimen and drawing are strong afterwards
Degree.
(1) shearing test result
Determine respectively different cycle-indexes (0,5,10,15,20,25 times) 100mm × 100mm × 100mm be combined lab scale
The shear strength of part, every kind of cycle-index is using 4 parallel test specimens, and shear rate is 10mm/min, and shearing inclination is 45 °.Cut
Cut result of the test as shown in table 1.
The shear strength of the different freezing-thawing cycles test specimens of table 1
As seen from Figure 1：With the increase of freezing-thawing cycles, cement-based waterproof tack coat shear strength is gradually reduced,
32.6% is have dropped from 0 Frozen-thawed cycled to 10 Frozen-thawed cycled shear strengths, fall off rate is 0.093MPa/ times, from 10 times
Frozen-thawed cycled have dropped 18.8% to 25 Frozen-thawed cycled shear strengths, and fall off rate is 0.024MPa/ times.Illustrate that cement base is prevented
10 Frozen-thawed cycleds influence larger to its shear strength before water tack coat, and freeze thawing is got on shear strength influence after 10 Frozen-thawed cycleds
Come smaller, therefore 10 freezing-thawing cycles can be used for evaluating to the freezing and thawing performance of cement-based waterproof tack coat.
(2) pull-out test result
Determine respectively different freezing-thawing cycles (0,5,10,15,20,25 times) pave-load layer 50mm × 50mm × 50mm+
The pull strength of cement concrete flaggy 70mm × 70mm × 50mm compound drawing test specimen, every kind of freezing-thawing cycles use 4
Individual parallel test specimen.Pull-out test result is as shown in table 2.
The pull strength of the different cycle-index test specimens of table 2
As seen from Figure 2：With the increase of freezing-thawing cycles, cement-based waterproof tack coat pull strength is gradually reduced,
35.7% is have dropped from 0 Frozen-thawed cycled to 10 Frozen-thawed cycled pull strengths, fall off rate is 0.04MPa/ times, from 10 jellies
Melt and be recycled to 25 Frozen-thawed cycled pull strengths and have dropped 20.8%, fall off rate is 0.01MPa/ times.Illustrate cement-based waterproof
10 Frozen-thawed cycleds influence larger to its pull strength before tack coat, and freeze thawing influences more next to pull strength after 10 Frozen-thawed cycleds
It is smaller, therefore 10 freezing-thawing cycles can be used for evaluating to the freezing and thawing performance of cement-based waterproof tack coat.
To sum up, from shearing and pull-out test result, cement-based waterproof tack coat is used：Freeze in -18 DEG C of ± 2 DEG C of refrigerators
Melt 1h Frozen-thawed cycled mode in 4h, 60 DEG C of ± 0.5 DEG C of water, preceding 10 freezing-thawing cycles are sheared and pull strength influence on it
Larger, intensity fall off rate is very fast, and intensity decline is more and more slower after 10 freezing-thawing cycles, therefore, can be by -18 DEG C ± 2 DEG C
Freeze in refrigerator and melt 1h in 4h, 60 DEG C of ± 0.5 DEG C of water, Frozen-thawed cycled 10 times is used as evaluation cement-based waterproof tack coat freeze-thaw resistance
The test method of energy.
Embodiment 2：
The present embodiment is differed only in embodiment 1：
Step (7), 20 shear test blocks and 20 pull-out experiments are respectively put into rubber experiment box, add drinking water,
It was not had test specimen top surface 2mm, then 16h is freezed in -18 DEG C of refrigerators, the test specimen freezed after 16h is put into 25 DEG C in 10min
The Frozen-thawed cycled mode for melting 24h in water carries out 1 circulation.
The shear strength and pull strength of its test specimen are surveyed, result of the test is shown in Table 3 and table 4.
The shear strength of test specimen after 3 Frozen-thawed cycled of table 1 time
The pull strength of test specimen after 4 Frozen-thawed cycled of table 1 time
It can be seen that from table 3 and table 4：The Frozen-thawed cycled for melting 24h in 16h, 25 DEG C of water using being freezed from -18 DEG C of refrigerators
Mode is carried out after 1 circulation, and the shear strength and pull strength of test specimen have dropped 1.8% and 2.7% respectively, and fall is very
It is small, illustrate this Frozen-thawed cycled mode and number of times, the pull strength and shear strength influence on cement-based waterproof tack coat are smaller,
The slight drop of this pull strength and shear strength, causes result of the test because of the error and operating error of instrument sometimes
It is completely different.
Therefore consider that shortening freeze thawing time, increase number of freezing and thawing, change melt temperature carry out freezing and thawing test, it is selected
Freeze thawing temperature be, according to two extreme temperatures that can occur in real road, to be also simultaneously《Highway engineering cement and cement
Concrete test code》With《Highway engineering pitch and Asphalt Mixture Experiment code》Middle evaluation cement concrete and pitch mixing
The temperature that material freeze thawing resistance effect is used.
Claims (10)
1. a kind of test method for evaluating cement-based waterproof tack coat freezing and thawing performance, comprises the following steps：
Step one：Moistened on prefabricated coagulating cement soil block with acrylic emulsions, normal temperature is stood；
Step 2：Cement-based material is smeared on the coagulating cement soil block moistened, is struck off with cement flexible spatulas；
Step 3：The coagulating cement soil block room temperature of cement-based material will be smeared；
Step 4：Asphalt is overlayed when cement-based material pre-hardening state；
Step 5：The cement concrete composite samples normal temperature health of asphalt will be completed；
Step 6：The good cement concrete composite samples of health are cut into shear test block and pull-out experiment, and use asphalt mixtures modified by epoxy resin
Fat is stained with drawing head；
Step 7：Shear test block and pull-out experiment are respectively put into rubber experiment box, drinking water is added, is put into cold in refrigerator
Freeze, then the test specimen after freezing is put into water and melted, is now 1 Frozen-thawed cycled；
Step 8：Before shearing test and pull-out test is carried out, test specimen is placed in water and kept；
Step 9：The shear strength and pull strength of test specimen after sequentially determining difference freezing-thawing cycles；
Step 10：By the shear strength and pull strength changing rule of different freezing-thawing cycles test specimens, it is determined that being best suitable for commenting
The method of valency cement-based waterproof bonding layer material freezing and thawing performance.
2. the test method of cement-based waterproof tack coat freezing and thawing performance is evaluated as claimed in claim 1, it is characterised in that：Step
In rapid one, moistened on coagulating cement soil block with acrylic emulsions, consumption is 100 ~ 300g/m2。
3. the test method of cement-based waterproof tack coat freezing and thawing performance is evaluated as claimed in claim 1, it is characterised in that：Step
In rapid one, the coagulating cement soil block normal temperature after being moistened with acrylic emulsions stands 3 ~ 5min.
4. the test method of cement-based waterproof tack coat freezing and thawing performance is evaluated as claimed in claim 1, it is characterised in that：Step
In rapid two, cement base thickness control is in 3 ~ 5mm.
5. the test method of cement-based waterproof tack coat freezing and thawing performance is evaluated as claimed in claim 1, it is characterised in that：Step
In rapid three, the coagulating cement soil block room temperature 0.5h of cement-based material is smeared.
6. the test method of cement-based waterproof tack coat freezing and thawing performance is evaluated as claimed in claim 1, it is characterised in that：Step
In rapid five, the cement concrete composite samples normal temperature health 14d of asphalt is completed.
7. the test method of cement-based waterproof tack coat freezing and thawing performance is evaluated as claimed in claim 1, it is characterised in that：Step
In rapid six, cement concrete composite samples cut into 100mm × 100mm × 100mm shear test block.
8. the test method of cement-based waterproof tack coat freezing and thawing performance is evaluated as claimed in claim 1, it is characterised in that：Step
In rapid six, cement concrete composite samples cut into pave-load layer 50mm × 50mm × 50mm+ cement concrete flaggies 70mm ×
70mm × 50mm pull-out experiment.
9. the test method of cement-based waterproof tack coat freezing and thawing performance is evaluated as claimed in claim 1, it is characterised in that：Step
In rapid seven, shear test block and pull-out experiment are put into rubber experiment box from 20 freeze respectively.
10. the test method of cement-based waterproof tack coat freezing and thawing performance is evaluated as claimed in claim 1, it is characterised in that：
Added in step 7, in rubber experiment box and drink water to make it not have test specimen top surface 1mm ~ 3mm.
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