CN106316192A - Application of thermosensitive hydrogel for improving anti-freezing and anti-thawing performance of concrete - Google Patents
Application of thermosensitive hydrogel for improving anti-freezing and anti-thawing performance of concrete Download PDFInfo
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- 239000000017 hydrogel Substances 0.000 title claims abstract description 59
- 238000010257 thawing Methods 0.000 title claims abstract description 19
- 238000007710 freezing Methods 0.000 title abstract description 9
- 239000004568 cement Substances 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000002994 raw material Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 19
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 239000000178 monomer Substances 0.000 claims description 12
- QNILTEGFHQSKFF-UHFFFAOYSA-N n-propan-2-ylprop-2-enamide Chemical compound CC(C)NC(=O)C=C QNILTEGFHQSKFF-UHFFFAOYSA-N 0.000 claims description 12
- 241000233803 Nypa Species 0.000 claims description 11
- 235000005305 Nypa fruticans Nutrition 0.000 claims description 11
- 239000003431 cross linking reagent Substances 0.000 claims description 11
- 239000003999 initiator Substances 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 6
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 4
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Chemical compound [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 4
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 2
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 claims description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 2
- 235000019394 potassium persulphate Nutrition 0.000 claims description 2
- 239000008187 granular material Substances 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 11
- 238000006703 hydration reaction Methods 0.000 abstract description 7
- 230000036571 hydration Effects 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 4
- 239000012615 aggregate Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 14
- 238000010998 test method Methods 0.000 description 11
- 239000000499 gel Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 230000008602 contraction Effects 0.000 description 8
- 230000006378 damage Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 229910052681 coesite Inorganic materials 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 229910052682 stishovite Inorganic materials 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 150000001408 amides Chemical group 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009746 freeze damage Effects 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000011557 critical solution Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 230000000887 hydrating effect Effects 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007614 solvation Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000004227 thermal cracking Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2652—Nitrogen containing polymers, e.g. polyacrylamides, polyacrylonitriles
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/601—Agents for increasing frost resistance
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides application of thermosensitive hydrogel for improving the anti-freezing and anti-thawing performance of concrete. The concrete is prepared from thermosensitive hydrogel, cement, aggregates and water. The thermosensitive hydrogel is mixed into the concrete, and mass losses of the concrete can be remarkably reduced and the anti-creaking strength of the concrete is improved on the premise that the mechanical property of the concrete is not affected. The hydration process of cement granules inside the concrete is promoted through water release of the thermosensitive hydrogel, the concrete compactness is improved, and therefore the anti-freezing performance of the concrete can be improved. Due to the fact that the thermosensitive hydrogel is mixed into the concrete, volume expansion and shrinkage of the concrete are resisted through volume expansion and shrinkage generated by high low temperature phase changes of the thermosensitive hydrogel, and the anti-freezing performance of the concrete can be improved.
Description
Technical field
The invention belongs to pavement material field, relate to cement concrete material, be specifically related in a kind of cement concrete mix
Enter temperature-sensitive hydrogel and make it have the application of opposing freezing-thawing damage performance.
Background technology
Concrete through freeze-thaw test is the concrete destruction form under water and freeze-thaw cycle act on jointly, in mainly showing as
Portion's micro-crack and surface deterioration.Under normal circumstances, concrete is volume contraction when low temperature, volumetric expansion during high temperature, this freeze injury
After acting on repeatedly accumulation, eventually make concrete structure expand, ftracture, degrade with defeated and dispersed, cause structural failure.Freeze
Melting destruction is modal destruction in China northeast, northwest and North China's concrete structure engineering, cold district often with
The concrete structure of water contact, almost the engineering of 100% locally or suffers freeze-thaw damage in various degree in large area, has
The most i.e. there is serious freeze injury in work progress or after being completed in engineering, can accelerate the deterioration of xoncrete structure performance, serious prestige
The safety of side of body works and service life, cause national property and economic massive losses.Therefore, analyze what concrete freeze thawing was broken
Reason, it is considered to cause the various influence factors of concrete through freeze-thaw test, improving concrete endurance quality under freezing-thawing is
It is highly desirable to.
At present, have for the major measure improving concrete frost resistance following several: reduce water-binder ratio, admixture draw
Gas agent, strictly control aggregate quality.Reduce water-cement ratio can reduce concrete to a certain extent and satisfy water degree, but reduce water-cement ratio pair
The impact of open volume is very limited amount of, and the effectiveness of this method is the highest.Air-entrained agent is to have mesh in concrete
Ground introduce the most small bubble to improve Air Content of Air-entrained Concrete and to reduce average bubble spacing, thus improve agent on crack resistance of concrete
Freezing property, but air content is the biggest, and concrete crushing strength is the lowest, and usual per unit air content makes concrete crushing strength loss 3
～6%, the therefore bearing capacity of meeting loss structure significantly while improving frost resistance.As can be seen here, a kind of novel tool is researched and developed
There is the concrete of freezing and thawing performance, be effectively improved China's cold district concrete and this phenomenon of freeze-thaw damage easily occurs, be urgently
Major issue to be solved.
Summary of the invention
The deficiency existed for prior art, it is an object of the invention to, it is provided that a kind of temperature-sensitive hydrogel, is used for improving mixed
Solidifying soil freezing and thawing performance, solves prior art and is used for cement concrete freeze thawing resistance poor effect, affect cement concrete mechanical property
The technical problem of energy.
In order to solve above-mentioned technical problem, the present invention adopts the following technical scheme that and is achieved:
Temperature-sensitive hydrogel application in improving agent on crack resistance of concrete freeze thawing performance, temperature-sensitive hydrogel is NIPA
Based aquagel.
The raw material of preparing of temperature-sensitive hydrogel includes NIPA monomer, deionized water, initiator and cross-linking agent.
Initiator is one or more in Ammonium persulfate., potassium peroxydisulfate and sodium peroxydisulfate.
Cross-linking agent is one or more in tetramethylethylenediamine, cumyl peroxide and acrylic acid.
The addition of NIPA monomer, deionized water, initiator and cross-linking agent be in mass ratio 9.9%～
11.2%:88.8%～90%:0.0041%～0.0043%:0.0055%～0.0057%.
Concrete is calculated in mass percent, and is made up of following raw material: temperature-sensitive hydrogel is 2%～5%, and cement is 14.2%
～16%, gathering materials is 73%～75%, and water is 6.8%～8%, and the mass percent sum of raw material is 100%.
Concrete is calculated in mass percent, and is made up of following raw material: temperature-sensitive hydrogel is 4%, and cement is 15%, gather materials for
74%, water is 7%.
Gather materials and include that particle size range is less than the fine aggregate of 5mm and coarse aggregate that particle size range is 10～31.5mm.
The present invention compared with prior art, has the following technical effect that
(I) present invention mixes temperature-sensitive hydrogel in concrete, can be bright on the premise of not affecting mechanical performance of concrete
The aobvious mass loss reducing concrete, improves the resistance of failure of concrete.
(II) present invention releases water by temperature-sensitive hydrogel and promotes the heat evolution velocity of cement granules in concrete, increases coagulation
Soil compactness, thus improve concrete frost resistance.Temperature-sensitive hydrogel is mixed, by the high/low temperature of temperature-sensitive hydrogel in concrete
The volumetric expansion of phase transformation generation and contraction, the volume contraction of opposing concrete and expansion, it is achieved the improvement of concrete antifreezing performance.
Accompanying drawing explanation
Fig. 1 is schematic diagram before and after temperature-sensitive hydrogel phase transformation.
Fig. 2 is temperature-sensitive hydrogel existence schematic diagram in mortar before and after hydrated cementitious heat release, temperature when (a) is aquation
Quick hydrogel existing forms, (b) is that aquation terminates rear temperature-sensitive hydrogel existing forms.
The specific embodiment of the present invention given below, it should be noted that and the invention is not limited in and implement in detail below
Example, all equivalents done on the basis of technical scheme each fall within protection scope of the present invention.
Detailed description of the invention
The temperature-sensitive hydrogel mixed in the present invention, its volume changes along with the change of temperature, on macromolecule side chain simultaneously
Containing hydrophilic amide groups-CONH-and hydrophobic isopropyl-CH (CH3)2, owing to the change of ambient temperature have impact on group
Hydrophobic interaction, hydrogen bond action between hydrogen bond action and hydrophilic group between macromolecular chain, make hydrogel low face at it
There is phase in version during 32 DEG C of temperature of boundary's solution temperature, transparent solvent swelling state become opaque deswelling state.Work as the external world
When temperature is less than 32 DEG C, there is stronger hydrogen bond action between hydrophilic group and hydrone, make macromolecular chain have good parent
Aqueous, volumetric expansion, by hydrone solvation but water insoluble；When ambient temperature is higher than 32 DEG C, hydrophilic group and moisture
Hydrogen bond action between son gradually weakens, and the interaction between hydrophobic group is strengthened, and macromolecular chain is mutually interpolymerized by hydrophobic interaction
Collection, volume contraction.
After cement granules in concrete contacts with water, carry out cement hydration process, generate hydrated product, along with aquation is produced
Being continuously increased of thing, the pore between cement granules is constantly filled, and concrete constantly becomes closely knit, but it practice, cement
Heat evolution velocity thorough, the relatively inside of cement grit granule is extremely difficult to complete aquation, and therefore concrete can not be fully achieved
Dense state.
At the cement hydration process initial stage, can release the most heat of hydration, now concrete internal temperature may be up to simultaneously
50～60 DEG C, exceed temperature-sensitive hydrogel phase transition temperature, as it is shown in figure 1, the hydrophilic group on temperature-sensitive hydrogel macromolecule side chain
Hydrogen bond action between amide groups-CONH-and hydrone weakens significantly, and macromolecular chain is mutually assembled, volume contraction, thus by temperature sensitive
Moisture in hydrogel discharges.The moisture discharged contacts with unhydrated cement granules, can carry out aquation further anti-
Should, increasing hydrated product, pore is constantly filled so that concrete is more closely knit, and the full water degree of internal void reduces, water
Dividing and should not penetrate into, hydrostatic pressure reduces, and concrete frost resistance improves.
In the present invention, temperature-sensitive hydrogel is not to mix in concrete with certain proportion simply, but temperature-sensitive hydrogel
Utilize cement hydration process to put thermogenetic temperature and carry out phase transformation (temperature-sensitive hydrogel water suction volumetric expansion opposing during low temperature of self
The volume contraction of concrete, during high temperature, temperature-sensitive hydrogel volume contraction can resist the volumetric expansion of concrete).Meanwhile, temperature sensitive water
Water polymerization film formation released by gel when hydrated cementitious, on the one hand, the hydrone discharged can continue to send out with unhydrated cement granules
Raw hydration reaction, generates hydrated product, and the hydrated product of increase makes pore constantly be filled, and finally makes concrete more encrypt
Real., when test specimen endure cold on the other hand, after temperature-sensitive hydrogel polymerization film formation by part of cement particle encapsulation wherein, temperature sensitive water
Free water in gel freezes and produces frost-heaving force, destroys membrane structure, and cement granules is released；When test specimen melts, water
Mud granule continues to react with water, generates hydrated product.Under the common effect of these factors, the thermal stability of concrete is able to
Improving, the anti-freezing property of concrete is improved.The water molecule reaction that cement granules discharges with gel can use following equation table
Show:
3CaO·SiO2+6H2O=3CaO SiO2·3H2O+3Ca(OH)2
2(2CaO·SiO2)+4H2O=3CaO SiO2·3H2O+Ca(OH)2
3CaO·Al2O3+6H2O=3CaO Al2O3·6H2O
As in figure 2 it is shown, before concrete hydrating reaction occurs, have hole between mortar, exist with solid gel form, water
During muddy water, temperature-sensitive hydrogel releases water polymerization film formation, and the hydrone discharged can continue and unhydrated cement granules generation aquation
Reaction, generates hydrated product, and the hydrated product of increase makes pore constantly be filled, and colloidal fills up the hole between mortar
Gap, finally makes concrete more closely knit.
It addition, while temperature-sensitive hydrogel generation volume contraction, phase in version, also can be with endothermic thermal event.This heat absorption is existing
As mass concrete engineering should not be distributed and the excessive problem of the internal-external temperature difference that causes has owing to the heat of hydration accumulates in inside
Certain mitigation, can reduce the temperature stress in concrete, reduces concrete and produces the probability of thermal cracking, thus has
Effect stops the intrusion of extraneous water, improves the ability that agent on crack resistance of concrete freeze thawing destroys.
The specific embodiment of the present invention given below, it should be noted that and the invention is not limited in and implement in detail below
Example, all equivalents done on the basis of technical scheme each fall within protection scope of the present invention.
Embodiment 1:
The present embodiment provides a kind of concrete, is calculated in mass percent, is made up of following raw material: temperature-sensitive hydrogel is 4%,
Cement is 15%, and gathering materials is 74%, and water is 7%；Wherein fine aggregate is 25%, and coarse aggregate is 49%.
Wherein: the lower critical solution temperature of involved temperature sensitive type water gel is 32 DEG C.
The modulus of fineness of fine aggregate is 2.8, and clay content is 2.5%, and apparent density is 2650kg/m3, bulk density is
1420kg/m3。
The particle diameter of coarse aggregate is distributed as 10～31.5mm, and crush index is 7.5%, and apparent density is 2690kg/m3, containing mud
Amount is 0.5%.The cumulative volume accounted in concrete that gathers materials is the highest, in most cases, is extremely difficult to critical in the inside that gathers materials
Full water degree, therefore the least by the concrete through freeze-thaw test caused that gathers materials, gathering materials of different-grain diameter selected by all the application fillers.
Cement is 42.5R Portland cement, and normal consistency is 28.8%, and stability is qualified,
Composition of raw materials based on the present embodiment, the concrete preparation process of the present embodiment concrete is as described below:
Step one, prepares temperature-sensitive hydrogel, first 8g NIPA monomer and 72g deionized water is mixed, logical
Entering nitrogen-sealed protection, stirring to monomer is completely dissolved prepared NIPA monomer solution, then to N-isopropyl
Acrylamide monomer aqueous solution is separately added into initiation 0.0033g and cross-linking agent 0.0044g, after being passed through nitrogen-sealed protection, 25
React 17h under DEG C water-bath, prepare temperature-sensitive hydrogel；
Step 2, gathers materials 1480g uniform with 300g cement mix；
Step 3, prepares step one temperature-sensitive hydrogel 80g and water 140g and joins in the mixture that step 2 prepares,
Mix is uniform, prepares concrete.
Freeze-thaw cycle contrast test is carried out, with reference to GB/T50082-2009 after the cement concrete standard curing 28d of preparation
Method of freezing soon in " Standard for test methods of longterm performance and durability of ordinary concrete standard ", after freeze-thaw cycle 180 times, detection is mixed
The mass loss rate of solidifying soil and relative dynamic elastic modulus, with reference to GB/T 50081-2002 " normal concrete mechanical property test side
Method standard " carry out mechanical performance of concrete detection.
The mass loss rate test result of the present embodiment concrete is as shown in table 1, and concrete relative dynamic elastic modulus is tested
Result is as shown in table 2, and mechanical performance of concrete test result is as shown in table 3.
Embodiment 2:
The present embodiment provides a kind of freeze-thaw resisting cement concrete, is calculated in mass percent, is made up of following raw material: temperature sensitive water
Gel is 2%, and cement is 15.5%, and gathering materials is 75%, and water is 7.5%.
In the present embodiment the most same as in Example 1 to the requirement of raw material and the preparation method of freeze-thaw resisting cement concrete, institute
Except for the difference that, the addition of NIPA monomer, deionized water, initiator and cross-linking agent be respectively as follows: 4g, 36g,
0.0017g、0.0022g。
The mass loss rate method of testing of the present embodiment concrete, relative dynamic elastic modulus method of testing, mechanical property are surveyed
Method for testing is same as in Example 1, and result is as shown in table 1,2,3.
Embodiment 3:
The present embodiment provides a kind of freeze-thaw resisting cement concrete, is calculated in mass percent, is made up of following raw material: temperature sensitive water
Gel is 5%, and cement is 14.2%, and gathering materials is 74%, and water is 6.8%.
In the present embodiment the most same as in Example 1 to the requirement of raw material and the preparation method of freeze-thaw resisting cement concrete, institute
Except for the difference that, the addition of NIPA monomer, deionized water, initiator and cross-linking agent be respectively as follows: 10g, 90g,
0.0041g、0.0055g。
The mass loss rate method of testing of the present embodiment concrete, relative dynamic elastic modulus method of testing, mechanical property are surveyed
Method for testing is same as in Example 1, and result is as shown in table 1,2,3.
Embodiment 4:
The present embodiment provides a kind of freeze-thaw resisting cement concrete, is calculated in mass percent, is made up of following raw material: temperature sensitive water
Gel is 4%, and cement is 16%, and gathering materials is 73%, and water is 7%.
In the present embodiment the most same as in Example 1 to the requirement of raw material and the preparation method of freeze-thaw resisting cement concrete, institute
Except for the difference that, the addition of NIPA monomer, deionized water, initiator and cross-linking agent be respectively as follows: 8g, 72g,
0.0032g、0.0044g。
The mass loss rate method of testing of the present embodiment concrete, relative dynamic elastic modulus method of testing, mechanical property are surveyed
Method for testing is same as in Example 1, and result is as shown in table 1,2,3.
Embodiment 5:
The present embodiment provides a kind of freeze-thaw resisting cement concrete, is calculated in mass percent, is made up of following raw material: temperature sensitive water
Gel is 3%, and cement is 15%, and gathering materials is 74%, and water is 8%.
In the present embodiment the most same as in Example 1 to the requirement of raw material and the preparation method of freeze-thaw resisting cement concrete, institute
Except for the difference that, the addition of NIPA monomer, deionized water, initiator and cross-linking agent be respectively as follows: 9g, 71g,
0.0034g、0.0046g。
The mass loss rate method of testing of the present embodiment concrete, relative dynamic elastic modulus method of testing, mechanical property are surveyed
Method for testing is same as in Example 1, and result is as shown in table 1,2,3.
Comparative example 1:
This comparative example provides a kind of cement concrete, is calculated in mass percent, is made up of following raw material: cement is
17.5%, gathering materials is 74% (wherein fine aggregate is 25%, and coarse aggregate is 49%), and water is 8.5%.Raw material based on this comparative example
Formula, the concrete preparation process of the concrete of this comparative example is as described below:
Step one, mixes with 500g fine aggregate at ambient temperature by 980g coarse aggregate, adds 350g cement mix equal
Even.
Step 2, joins in the mixture that step 2 prepares by 170g water, and mix is uniform, prepares cement concrete.
The mass loss rate method of testing of the present embodiment concrete, relative dynamic elastic modulus method of testing, mechanical property are surveyed
Method for testing is same as in Example 1, and result is as shown in table 1,2,3.
Effect analysis:
Being mixed by temperature-sensitive hydrogel in concrete, the mass loss rate of cement concrete is significantly lower than being not added with temperature-sensitive hydrogel
Cement concrete (table 1), illustrate that the incorporation of temperature-sensitive hydrogel can significantly reduce concrete volume mass loss.
The mass loss rate of table 1 concrete
| Embodiment | Mass loss rate (%) |
| Embodiment 1 | 1.8484 |
| Embodiment 2 | 2.2239 |
| Embodiment 3 | 2.1697 |
| Embodiment 4 | 1.8487 |
| Embodiment 5 | 1.8486 |
| Comparative example 1 | 5.1641 |
Comparing normal concrete, the intensity of the agent on crack resistance of concrete destruction mixing temperature-sensitive hydrogel exceeds a lot (table 2), and temperature sensitive
The incorporation of hydrogel improves the fracture resistance of concrete, the compressive property of concrete is affected little (table 3) simultaneously.
The relative dynamic elastic modulus of table 2 concrete
| Embodiment | Relative dynamic elastic modulus (%) |
| Embodiment 1 | 84.3 |
| Embodiment 2 | 74.4 |
| Embodiment 3 | 82.3 |
| Embodiment 4 | 84.3 |
| Embodiment 5 | 84.2 |
| Comparative example 1 | 44.2 |
The mechanical property of table 3 concrete
| Embodiment | Rupture strength/MPa | Comprcssive strength/MPa |
| Embodiment 1 | 5.5 | 32.4 |
| Embodiment 2 | 5.2 | 32.3 |
| Embodiment 3 | 5.6 | 32 |
| Embodiment 4 | 5.4 | 32.4 |
| Embodiment 5 | 5.5 | 32.5 |
| Comparative example 1 | 5.3 | 34 |
Therefore temperature-sensitive hydrogel is mixed (embodiment 1-5) in cement concrete, cement concrete opposing freeze-thaw damage
Performance is substantially better than the cement concrete (comparative example 1) being not added with temperature-sensitive hydrogel.
Claims (8)
1. temperature-sensitive hydrogel application in improving agent on crack resistance of concrete freeze thawing performance, described temperature-sensitive hydrogel is N-isopropyl acrylamide
Amido hydrogel.
2. temperature-sensitive hydrogel application in improving agent on crack resistance of concrete freeze thawing performance as claimed in claim 1, it is characterised in that described
The raw material of preparing of temperature-sensitive hydrogel includes NIPA monomer, deionized water, initiator and cross-linking agent.
3. temperature-sensitive hydrogel application in improving agent on crack resistance of concrete freeze thawing performance as claimed in claim 2, it is characterised in that described
Initiator is one or more compositionss in Ammonium persulfate., potassium peroxydisulfate and sodium peroxydisulfate.
4. temperature-sensitive hydrogel application in improving agent on crack resistance of concrete freeze thawing performance as claimed in claim 2, it is characterised in that described
Cross-linking agent is one or more compositionss in tetramethylethylenediamine, cumyl peroxide and acrylic acid.
5. temperature-sensitive hydrogel application in improving agent on crack resistance of concrete freeze thawing performance as claimed in claim 2, it is characterised in that described
The addition of NIPA monomer, deionized water, initiator and cross-linking agent is 9.9%～11.2% in mass ratio:
88.8%～90%:0.0041%～0.0043%:0.0055%～0.0057%.
6. temperature-sensitive hydrogel application in improving agent on crack resistance of concrete freeze thawing performance as claimed in claim 1, it is characterised in that described
Concrete is calculated in mass percent, and is made up of following raw material: temperature-sensitive hydrogel is 2%～5%, and cement is 14.2%～16%,
Gathering materials is 73%～75%, and water is 6.8%～8%, and the mass percent sum of raw material is 100%.
7. temperature-sensitive hydrogel application in improving agent on crack resistance of concrete freeze thawing performance as claimed in claim 6, it is characterised in that described
Concrete is calculated in mass percent, and is made up of following raw material: temperature-sensitive hydrogel is 4%, and cement is 15%, and gathering materials is 74%, water
It is 7%.
8. temperature-sensitive hydrogel application in improving agent on crack resistance of concrete freeze thawing performance as claimed in claim 6, it is characterised in that described
Gather materials and include that particle size range is less than the fine aggregate of 5mm and coarse aggregate that particle size range is 10～31.5mm.
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